diff options
Diffstat (limited to 'accounts')
41 files changed, 9350 insertions, 0 deletions
diff --git a/accounts/abi/abi.go b/accounts/abi/abi.go new file mode 100644 index 0000000..7af6685 --- /dev/null +++ b/accounts/abi/abi.go @@ -0,0 +1,192 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "bytes" + "encoding/json" + "fmt" + "io" + + "github.com/ava-labs/go-ethereum/common" +) + +// The ABI holds information about a contract's context and available +// invokable methods. It will allow you to type check function calls and +// packs data accordingly. +type ABI struct { + Constructor Method + Methods map[string]Method + Events map[string]Event +} + +// JSON returns a parsed ABI interface and error if it failed. +func JSON(reader io.Reader) (ABI, error) { + dec := json.NewDecoder(reader) + + var abi ABI + if err := dec.Decode(&abi); err != nil { + return ABI{}, err + } + + return abi, nil +} + +// Pack the given method name to conform the ABI. Method call's data +// will consist of method_id, args0, arg1, ... argN. Method id consists +// of 4 bytes and arguments are all 32 bytes. +// Method ids are created from the first 4 bytes of the hash of the +// methods string signature. (signature = baz(uint32,string32)) +func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) { + // Fetch the ABI of the requested method + if name == "" { + // constructor + arguments, err := abi.Constructor.Inputs.Pack(args...) + if err != nil { + return nil, err + } + return arguments, nil + } + method, exist := abi.Methods[name] + if !exist { + return nil, fmt.Errorf("method '%s' not found", name) + } + arguments, err := method.Inputs.Pack(args...) + if err != nil { + return nil, err + } + // Pack up the method ID too if not a constructor and return + return append(method.ID(), arguments...), nil +} + +// Unpack output in v according to the abi specification +func (abi ABI) Unpack(v interface{}, name string, data []byte) (err error) { + if len(data) == 0 { + return fmt.Errorf("abi: unmarshalling empty output") + } + // since there can't be naming collisions with contracts and events, + // we need to decide whether we're calling a method or an event + if method, ok := abi.Methods[name]; ok { + if len(data)%32 != 0 { + return fmt.Errorf("abi: improperly formatted output: %s - Bytes: [%+v]", string(data), data) + } + return method.Outputs.Unpack(v, data) + } + if event, ok := abi.Events[name]; ok { + return event.Inputs.Unpack(v, data) + } + return fmt.Errorf("abi: could not locate named method or event") +} + +// UnpackIntoMap unpacks a log into the provided map[string]interface{} +func (abi ABI) UnpackIntoMap(v map[string]interface{}, name string, data []byte) (err error) { + if len(data) == 0 { + return fmt.Errorf("abi: unmarshalling empty output") + } + // since there can't be naming collisions with contracts and events, + // we need to decide whether we're calling a method or an event + if method, ok := abi.Methods[name]; ok { + if len(data)%32 != 0 { + return fmt.Errorf("abi: improperly formatted output") + } + return method.Outputs.UnpackIntoMap(v, data) + } + if event, ok := abi.Events[name]; ok { + return event.Inputs.UnpackIntoMap(v, data) + } + return fmt.Errorf("abi: could not locate named method or event") +} + +// UnmarshalJSON implements json.Unmarshaler interface +func (abi *ABI) UnmarshalJSON(data []byte) error { + var fields []struct { + Type string + Name string + Constant bool + Anonymous bool + Inputs []Argument + Outputs []Argument + } + if err := json.Unmarshal(data, &fields); err != nil { + return err + } + abi.Methods = make(map[string]Method) + abi.Events = make(map[string]Event) + for _, field := range fields { + switch field.Type { + case "constructor": + abi.Constructor = Method{ + Inputs: field.Inputs, + } + // empty defaults to function according to the abi spec + case "function", "": + name := field.Name + _, ok := abi.Methods[name] + for idx := 0; ok; idx++ { + name = fmt.Sprintf("%s%d", field.Name, idx) + _, ok = abi.Methods[name] + } + abi.Methods[name] = Method{ + Name: name, + RawName: field.Name, + Const: field.Constant, + Inputs: field.Inputs, + Outputs: field.Outputs, + } + case "event": + name := field.Name + _, ok := abi.Events[name] + for idx := 0; ok; idx++ { + name = fmt.Sprintf("%s%d", field.Name, idx) + _, ok = abi.Events[name] + } + abi.Events[name] = Event{ + Name: name, + RawName: field.Name, + Anonymous: field.Anonymous, + Inputs: field.Inputs, + } + } + } + + return nil +} + +// MethodById looks up a method by the 4-byte id +// returns nil if none found +func (abi *ABI) MethodById(sigdata []byte) (*Method, error) { + if len(sigdata) < 4 { + return nil, fmt.Errorf("data too short (%d bytes) for abi method lookup", len(sigdata)) + } + for _, method := range abi.Methods { + if bytes.Equal(method.ID(), sigdata[:4]) { + return &method, nil + } + } + return nil, fmt.Errorf("no method with id: %#x", sigdata[:4]) +} + +// EventByID looks an event up by its topic hash in the +// ABI and returns nil if none found. +func (abi *ABI) EventByID(topic common.Hash) (*Event, error) { + for _, event := range abi.Events { + if bytes.Equal(event.ID().Bytes(), topic.Bytes()) { + return &event, nil + } + } + return nil, fmt.Errorf("no event with id: %#x", topic.Hex()) +} diff --git a/accounts/abi/argument.go b/accounts/abi/argument.go new file mode 100644 index 0000000..4dae586 --- /dev/null +++ b/accounts/abi/argument.go @@ -0,0 +1,365 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "encoding/json" + "fmt" + "reflect" + "strings" +) + +// Argument holds the name of the argument and the corresponding type. +// Types are used when packing and testing arguments. +type Argument struct { + Name string + Type Type + Indexed bool // indexed is only used by events +} + +type Arguments []Argument + +type ArgumentMarshaling struct { + Name string + Type string + Components []ArgumentMarshaling + Indexed bool +} + +// UnmarshalJSON implements json.Unmarshaler interface +func (argument *Argument) UnmarshalJSON(data []byte) error { + var arg ArgumentMarshaling + err := json.Unmarshal(data, &arg) + if err != nil { + return fmt.Errorf("argument json err: %v", err) + } + + argument.Type, err = NewType(arg.Type, arg.Components) + if err != nil { + return err + } + argument.Name = arg.Name + argument.Indexed = arg.Indexed + + return nil +} + +// LengthNonIndexed returns the number of arguments when not counting 'indexed' ones. Only events +// can ever have 'indexed' arguments, it should always be false on arguments for method input/output +func (arguments Arguments) LengthNonIndexed() int { + out := 0 + for _, arg := range arguments { + if !arg.Indexed { + out++ + } + } + return out +} + +// NonIndexed returns the arguments with indexed arguments filtered out +func (arguments Arguments) NonIndexed() Arguments { + var ret []Argument + for _, arg := range arguments { + if !arg.Indexed { + ret = append(ret, arg) + } + } + return ret +} + +// isTuple returns true for non-atomic constructs, like (uint,uint) or uint[] +func (arguments Arguments) isTuple() bool { + return len(arguments) > 1 +} + +// Unpack performs the operation hexdata -> Go format +func (arguments Arguments) Unpack(v interface{}, data []byte) error { + // make sure the passed value is arguments pointer + if reflect.Ptr != reflect.ValueOf(v).Kind() { + return fmt.Errorf("abi: Unpack(non-pointer %T)", v) + } + marshalledValues, err := arguments.UnpackValues(data) + if err != nil { + return err + } + if arguments.isTuple() { + return arguments.unpackTuple(v, marshalledValues) + } + return arguments.unpackAtomic(v, marshalledValues[0]) +} + +// UnpackIntoMap performs the operation hexdata -> mapping of argument name to argument value +func (arguments Arguments) UnpackIntoMap(v map[string]interface{}, data []byte) error { + marshalledValues, err := arguments.UnpackValues(data) + if err != nil { + return err + } + + return arguments.unpackIntoMap(v, marshalledValues) +} + +// unpack sets the unmarshalled value to go format. +// Note the dst here must be settable. +func unpack(t *Type, dst interface{}, src interface{}) error { + var ( + dstVal = reflect.ValueOf(dst).Elem() + srcVal = reflect.ValueOf(src) + ) + tuple, typ := false, t + for { + if typ.T == SliceTy || typ.T == ArrayTy { + typ = typ.Elem + continue + } + tuple = typ.T == TupleTy + break + } + if !tuple { + return set(dstVal, srcVal) + } + + // Dereferences interface or pointer wrapper + dstVal = indirectInterfaceOrPtr(dstVal) + + switch t.T { + case TupleTy: + if dstVal.Kind() != reflect.Struct { + return fmt.Errorf("abi: invalid dst value for unpack, want struct, got %s", dstVal.Kind()) + } + fieldmap, err := mapArgNamesToStructFields(t.TupleRawNames, dstVal) + if err != nil { + return err + } + for i, elem := range t.TupleElems { + fname := fieldmap[t.TupleRawNames[i]] + field := dstVal.FieldByName(fname) + if !field.IsValid() { + return fmt.Errorf("abi: field %s can't found in the given value", t.TupleRawNames[i]) + } + if err := unpack(elem, field.Addr().Interface(), srcVal.Field(i).Interface()); err != nil { + return err + } + } + return nil + case SliceTy: + if dstVal.Kind() != reflect.Slice { + return fmt.Errorf("abi: invalid dst value for unpack, want slice, got %s", dstVal.Kind()) + } + slice := reflect.MakeSlice(dstVal.Type(), srcVal.Len(), srcVal.Len()) + for i := 0; i < slice.Len(); i++ { + if err := unpack(t.Elem, slice.Index(i).Addr().Interface(), srcVal.Index(i).Interface()); err != nil { + return err + } + } + dstVal.Set(slice) + case ArrayTy: + if dstVal.Kind() != reflect.Array { + return fmt.Errorf("abi: invalid dst value for unpack, want array, got %s", dstVal.Kind()) + } + array := reflect.New(dstVal.Type()).Elem() + for i := 0; i < array.Len(); i++ { + if err := unpack(t.Elem, array.Index(i).Addr().Interface(), srcVal.Index(i).Interface()); err != nil { + return err + } + } + dstVal.Set(array) + } + return nil +} + +// unpackIntoMap unpacks marshalledValues into the provided map[string]interface{} +func (arguments Arguments) unpackIntoMap(v map[string]interface{}, marshalledValues []interface{}) error { + // Make sure map is not nil + if v == nil { + return fmt.Errorf("abi: cannot unpack into a nil map") + } + + for i, arg := range arguments.NonIndexed() { + v[arg.Name] = marshalledValues[i] + } + return nil +} + +// unpackAtomic unpacks ( hexdata -> go ) a single value +func (arguments Arguments) unpackAtomic(v interface{}, marshalledValues interface{}) error { + if arguments.LengthNonIndexed() == 0 { + return nil + } + argument := arguments.NonIndexed()[0] + elem := reflect.ValueOf(v).Elem() + + if elem.Kind() == reflect.Struct && argument.Type.T != TupleTy { + fieldmap, err := mapArgNamesToStructFields([]string{argument.Name}, elem) + if err != nil { + return err + } + field := elem.FieldByName(fieldmap[argument.Name]) + if !field.IsValid() { + return fmt.Errorf("abi: field %s can't be found in the given value", argument.Name) + } + return unpack(&argument.Type, field.Addr().Interface(), marshalledValues) + } + return unpack(&argument.Type, elem.Addr().Interface(), marshalledValues) +} + +// unpackTuple unpacks ( hexdata -> go ) a batch of values. +func (arguments Arguments) unpackTuple(v interface{}, marshalledValues []interface{}) error { + var ( + value = reflect.ValueOf(v).Elem() + typ = value.Type() + kind = value.Kind() + ) + if err := requireUnpackKind(value, typ, kind, arguments); err != nil { + return err + } + + // If the interface is a struct, get of abi->struct_field mapping + var abi2struct map[string]string + if kind == reflect.Struct { + var ( + argNames []string + err error + ) + for _, arg := range arguments.NonIndexed() { + argNames = append(argNames, arg.Name) + } + abi2struct, err = mapArgNamesToStructFields(argNames, value) + if err != nil { + return err + } + } + for i, arg := range arguments.NonIndexed() { + switch kind { + case reflect.Struct: + field := value.FieldByName(abi2struct[arg.Name]) + if !field.IsValid() { + return fmt.Errorf("abi: field %s can't be found in the given value", arg.Name) + } + if err := unpack(&arg.Type, field.Addr().Interface(), marshalledValues[i]); err != nil { + return err + } + case reflect.Slice, reflect.Array: + if value.Len() < i { + return fmt.Errorf("abi: insufficient number of arguments for unpack, want %d, got %d", len(arguments), value.Len()) + } + v := value.Index(i) + if err := requireAssignable(v, reflect.ValueOf(marshalledValues[i])); err != nil { + return err + } + if err := unpack(&arg.Type, v.Addr().Interface(), marshalledValues[i]); err != nil { + return err + } + default: + return fmt.Errorf("abi:[2] cannot unmarshal tuple in to %v", typ) + } + } + return nil + +} + +// UnpackValues can be used to unpack ABI-encoded hexdata according to the ABI-specification, +// without supplying a struct to unpack into. Instead, this method returns a list containing the +// values. An atomic argument will be a list with one element. +func (arguments Arguments) UnpackValues(data []byte) ([]interface{}, error) { + retval := make([]interface{}, 0, arguments.LengthNonIndexed()) + virtualArgs := 0 + for index, arg := range arguments.NonIndexed() { + marshalledValue, err := toGoType((index+virtualArgs)*32, arg.Type, data) + if arg.Type.T == ArrayTy && !isDynamicType(arg.Type) { + // If we have a static array, like [3]uint256, these are coded as + // just like uint256,uint256,uint256. + // This means that we need to add two 'virtual' arguments when + // we count the index from now on. + // + // Array values nested multiple levels deep are also encoded inline: + // [2][3]uint256: uint256,uint256,uint256,uint256,uint256,uint256 + // + // Calculate the full array size to get the correct offset for the next argument. + // Decrement it by 1, as the normal index increment is still applied. + virtualArgs += getTypeSize(arg.Type)/32 - 1 + } else if arg.Type.T == TupleTy && !isDynamicType(arg.Type) { + // If we have a static tuple, like (uint256, bool, uint256), these are + // coded as just like uint256,bool,uint256 + virtualArgs += getTypeSize(arg.Type)/32 - 1 + } + if err != nil { + return nil, err + } + retval = append(retval, marshalledValue) + } + return retval, nil +} + +// PackValues performs the operation Go format -> Hexdata +// It is the semantic opposite of UnpackValues +func (arguments Arguments) PackValues(args []interface{}) ([]byte, error) { + return arguments.Pack(args...) +} + +// Pack performs the operation Go format -> Hexdata +func (arguments Arguments) Pack(args ...interface{}) ([]byte, error) { + // Make sure arguments match up and pack them + abiArgs := arguments + if len(args) != len(abiArgs) { + return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(abiArgs)) + } + // variable input is the output appended at the end of packed + // output. This is used for strings and bytes types input. + var variableInput []byte + + // input offset is the bytes offset for packed output + inputOffset := 0 + for _, abiArg := range abiArgs { + inputOffset += getTypeSize(abiArg.Type) + } + var ret []byte + for i, a := range args { + input := abiArgs[i] + // pack the input + packed, err := input.Type.pack(reflect.ValueOf(a)) + if err != nil { + return nil, err + } + // check for dynamic types + if isDynamicType(input.Type) { + // set the offset + ret = append(ret, packNum(reflect.ValueOf(inputOffset))...) + // calculate next offset + inputOffset += len(packed) + // append to variable input + variableInput = append(variableInput, packed...) + } else { + // append the packed value to the input + ret = append(ret, packed...) + } + } + // append the variable input at the end of the packed input + ret = append(ret, variableInput...) + + return ret, nil +} + +// ToCamelCase converts an under-score string to a camel-case string +func ToCamelCase(input string) string { + parts := strings.Split(input, "_") + for i, s := range parts { + if len(s) > 0 { + parts[i] = strings.ToUpper(s[:1]) + s[1:] + } + } + return strings.Join(parts, "") +} diff --git a/accounts/abi/bind/auth.go b/accounts/abi/bind/auth.go new file mode 100644 index 0000000..c916cc4 --- /dev/null +++ b/accounts/abi/bind/auth.go @@ -0,0 +1,96 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package bind + +import ( + "crypto/ecdsa" + "errors" + "io" + "io/ioutil" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/coreth/accounts/external" + "github.com/ava-labs/coreth/accounts/keystore" + "github.com/ava-labs/coreth/core/types" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/crypto" +) + +// NewTransactor is a utility method to easily create a transaction signer from +// an encrypted json key stream and the associated passphrase. +func NewTransactor(keyin io.Reader, passphrase string) (*TransactOpts, error) { + json, err := ioutil.ReadAll(keyin) + if err != nil { + return nil, err + } + key, err := keystore.DecryptKey(json, passphrase) + if err != nil { + return nil, err + } + return NewKeyedTransactor(key.PrivateKey), nil +} + +// NewKeyStoreTransactor is a utility method to easily create a transaction signer from +// an decrypted key from a keystore +func NewKeyStoreTransactor(keystore *keystore.KeyStore, account accounts.Account) (*TransactOpts, error) { + return &TransactOpts{ + From: account.Address, + Signer: func(signer types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) { + if address != account.Address { + return nil, errors.New("not authorized to sign this account") + } + signature, err := keystore.SignHash(account, signer.Hash(tx).Bytes()) + if err != nil { + return nil, err + } + return tx.WithSignature(signer, signature) + }, + }, nil +} + +// NewKeyedTransactor is a utility method to easily create a transaction signer +// from a single private key. +func NewKeyedTransactor(key *ecdsa.PrivateKey) *TransactOpts { + keyAddr := crypto.PubkeyToAddress(key.PublicKey) + return &TransactOpts{ + From: keyAddr, + Signer: func(signer types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) { + if address != keyAddr { + return nil, errors.New("not authorized to sign this account") + } + signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key) + if err != nil { + return nil, err + } + return tx.WithSignature(signer, signature) + }, + } +} + +// NewClefTransactor is a utility method to easily create a transaction signer +// with a clef backend. +func NewClefTransactor(clef *external.ExternalSigner, account accounts.Account) *TransactOpts { + return &TransactOpts{ + From: account.Address, + Signer: func(signer types.Signer, address common.Address, transaction *types.Transaction) (*types.Transaction, error) { + if address != account.Address { + return nil, errors.New("not authorized to sign this account") + } + return clef.SignTx(account, transaction, nil) // Clef enforces its own chain id + }, + } +} diff --git a/accounts/abi/bind/backend.go b/accounts/abi/bind/backend.go new file mode 100644 index 0000000..556394f --- /dev/null +++ b/accounts/abi/bind/backend.go @@ -0,0 +1,112 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package bind + +import ( + "context" + "errors" + "math/big" + + "github.com/ava-labs/coreth/core/types" + "github.com/ava-labs/go-ethereum" + "github.com/ava-labs/go-ethereum/common" +) + +var ( + // ErrNoCode is returned by call and transact operations for which the requested + // recipient contract to operate on does not exist in the state db or does not + // have any code associated with it (i.e. suicided). + ErrNoCode = errors.New("no contract code at given address") + + // This error is raised when attempting to perform a pending state action + // on a backend that doesn't implement PendingContractCaller. + ErrNoPendingState = errors.New("backend does not support pending state") + + // This error is returned by WaitDeployed if contract creation leaves an + // empty contract behind. + ErrNoCodeAfterDeploy = errors.New("no contract code after deployment") +) + +// ContractCaller defines the methods needed to allow operating with contract on a read +// only basis. +type ContractCaller interface { + // CodeAt returns the code of the given account. This is needed to differentiate + // between contract internal errors and the local chain being out of sync. + CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error) + // ContractCall executes an Ethereum contract call with the specified data as the + // input. + CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error) +} + +// PendingContractCaller defines methods to perform contract calls on the pending state. +// Call will try to discover this interface when access to the pending state is requested. +// If the backend does not support the pending state, Call returns ErrNoPendingState. +type PendingContractCaller interface { + // PendingCodeAt returns the code of the given account in the pending state. + PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) + // PendingCallContract executes an Ethereum contract call against the pending state. + PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error) +} + +// ContractTransactor defines the methods needed to allow operating with contract +// on a write only basis. Beside the transacting method, the remainder are helpers +// used when the user does not provide some needed values, but rather leaves it up +// to the transactor to decide. +type ContractTransactor interface { + // PendingCodeAt returns the code of the given account in the pending state. + PendingCodeAt(ctx context.Context, account common.Address) ([]byte, error) + // PendingNonceAt retrieves the current pending nonce associated with an account. + PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) + // SuggestGasPrice retrieves the currently suggested gas price to allow a timely + // execution of a transaction. + SuggestGasPrice(ctx context.Context) (*big.Int, error) + // EstimateGas tries to estimate the gas needed to execute a specific + // transaction based on the current pending state of the backend blockchain. + // There is no guarantee that this is the true gas limit requirement as other + // transactions may be added or removed by miners, but it should provide a basis + // for setting a reasonable default. + EstimateGas(ctx context.Context, call ethereum.CallMsg) (gas uint64, err error) + // SendTransaction injects the transaction into the pending pool for execution. + SendTransaction(ctx context.Context, tx *types.Transaction) error +} + +// ContractFilterer defines the methods needed to access log events using one-off +// queries or continuous event subscriptions. +type ContractFilterer interface { + // FilterLogs executes a log filter operation, blocking during execution and + // returning all the results in one batch. + // + // TODO(karalabe): Deprecate when the subscription one can return past data too. + FilterLogs(ctx context.Context, query ethereum.FilterQuery) ([]types.Log, error) + + // SubscribeFilterLogs creates a background log filtering operation, returning + // a subscription immediately, which can be used to stream the found events. + SubscribeFilterLogs(ctx context.Context, query ethereum.FilterQuery, ch chan<- types.Log) (ethereum.Subscription, error) +} + +// DeployBackend wraps the operations needed by WaitMined and WaitDeployed. +type DeployBackend interface { + TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error) + CodeAt(ctx context.Context, account common.Address, blockNumber *big.Int) ([]byte, error) +} + +// ContractBackend defines the methods needed to work with contracts on a read-write basis. +type ContractBackend interface { + ContractCaller + ContractTransactor + ContractFilterer +} diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go new file mode 100644 index 0000000..88610a4 --- /dev/null +++ b/accounts/abi/bind/backends/simulated.go @@ -0,0 +1,523 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package backends + +import ( + "context" + "errors" + "fmt" + "math/big" + "sync" + "time" + + "github.com/ava-labs/coreth/accounts/abi/bind" + "github.com/ava-labs/coreth/consensus/ethash" + "github.com/ava-labs/coreth/core" + "github.com/ava-labs/coreth/core/bloombits" + "github.com/ava-labs/coreth/core/rawdb" + "github.com/ava-labs/coreth/core/state" + "github.com/ava-labs/coreth/core/types" + "github.com/ava-labs/coreth/core/vm" + "github.com/ava-labs/coreth/params" + "github.com/ava-labs/coreth/rpc" + "github.com/ava-labs/go-ethereum" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/common/math" + "github.com/ava-labs/go-ethereum/eth/filters" + "github.com/ava-labs/go-ethereum/ethdb" + "github.com/ava-labs/go-ethereum/event" +) + +// This nil assignment ensures compile time that SimulatedBackend implements bind.ContractBackend. +var _ bind.ContractBackend = (*SimulatedBackend)(nil) + +var ( + errBlockNumberUnsupported = errors.New("simulatedBackend cannot access blocks other than the latest block") + errGasEstimationFailed = errors.New("gas required exceeds allowance or always failing transaction") +) + +// SimulatedBackend implements bind.ContractBackend, simulating a blockchain in +// the background. Its main purpose is to allow easily testing contract bindings. +type SimulatedBackend struct { + database ethdb.Database // In memory database to store our testing data + blockchain *core.BlockChain // Ethereum blockchain to handle the consensus + + mu sync.Mutex + pendingBlock *types.Block // Currently pending block that will be imported on request + pendingState *state.StateDB // Currently pending state that will be the active on on request + + events *filters.EventSystem // Event system for filtering log events live + + config *params.ChainConfig +} + +// NewSimulatedBackendWithDatabase creates a new binding backend based on the given database +// and uses a simulated blockchain for testing purposes. +func NewSimulatedBackendWithDatabase(database ethdb.Database, alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend { + genesis := core.Genesis{Config: params.AllEthashProtocolChanges, GasLimit: gasLimit, Alloc: alloc} + genesis.MustCommit(database) + blockchain, _ := core.NewBlockChain(database, nil, genesis.Config, ethash.NewFaker(), vm.Config{}, nil) + + backend := &SimulatedBackend{ + database: database, + blockchain: blockchain, + config: genesis.Config, + events: filters.NewEventSystem(new(event.TypeMux), &filterBackend{database, blockchain}, false), + } + backend.rollback() + return backend +} + +// NewSimulatedBackend creates a new binding backend using a simulated blockchain +// for testing purposes. +func NewSimulatedBackend(alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend { + return NewSimulatedBackendWithDatabase(rawdb.NewMemoryDatabase(), alloc, gasLimit) +} + +// Close terminates the underlying blockchain's update loop. +func (b *SimulatedBackend) Close() error { + b.blockchain.Stop() + return nil +} + +// Commit imports all the pending transactions as a single block and starts a +// fresh new state. +func (b *SimulatedBackend) Commit() { + b.mu.Lock() + defer b.mu.Unlock() + + if _, err := b.blockchain.InsertChain([]*types.Block{b.pendingBlock}); err != nil { + panic(err) // This cannot happen unless the simulator is wrong, fail in that case + } + b.rollback() +} + +// Rollback aborts all pending transactions, reverting to the last committed state. +func (b *SimulatedBackend) Rollback() { + b.mu.Lock() + defer b.mu.Unlock() + + b.rollback() +} + +func (b *SimulatedBackend) rollback() { + blocks, _ := core.GenerateChain(b.config, b.blockchain.CurrentBlock(), ethash.NewFaker(), b.database, 1, func(int, *core.BlockGen) {}) + statedb, _ := b.blockchain.State() + + b.pendingBlock = blocks[0] + b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database()) +} + +// CodeAt returns the code associated with a certain account in the blockchain. +func (b *SimulatedBackend) CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error) { + b.mu.Lock() + defer b.mu.Unlock() + + if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 { + return nil, errBlockNumberUnsupported + } + statedb, _ := b.blockchain.State() + return statedb.GetCode(contract), nil +} + +// BalanceAt returns the wei balance of a certain account in the blockchain. +func (b *SimulatedBackend) BalanceAt(ctx context.Context, contract common.Address, blockNumber *big.Int) (*big.Int, error) { + b.mu.Lock() + defer b.mu.Unlock() + + if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 { + return nil, errBlockNumberUnsupported + } + statedb, _ := b.blockchain.State() + return statedb.GetBalance(contract), nil +} + +// NonceAt returns the nonce of a certain account in the blockchain. +func (b *SimulatedBackend) NonceAt(ctx context.Context, contract common.Address, blockNumber *big.Int) (uint64, error) { + b.mu.Lock() + defer b.mu.Unlock() + + if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 { + return 0, errBlockNumberUnsupported + } + statedb, _ := b.blockchain.State() + return statedb.GetNonce(contract), nil +} + +// StorageAt returns the value of key in the storage of an account in the blockchain. +func (b *SimulatedBackend) StorageAt(ctx context.Context, contract common.Address, key common.Hash, blockNumber *big.Int) ([]byte, error) { + b.mu.Lock() + defer b.mu.Unlock() + + if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 { + return nil, errBlockNumberUnsupported + } + statedb, _ := b.blockchain.State() + val := statedb.GetState(contract, key) + return val[:], nil +} + +// TransactionReceipt returns the receipt of a transaction. +func (b *SimulatedBackend) TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error) { + receipt, _, _, _ := rawdb.ReadReceipt(b.database, txHash, b.config) + return receipt, nil +} + +// TransactionByHash checks the pool of pending transactions in addition to the +// blockchain. The isPending return value indicates whether the transaction has been +// mined yet. Note that the transaction may not be part of the canonical chain even if +// it's not pending. +func (b *SimulatedBackend) TransactionByHash(ctx context.Context, txHash common.Hash) (*types.Transaction, bool, error) { + b.mu.Lock() + defer b.mu.Unlock() + + tx := b.pendingBlock.Transaction(txHash) + if tx != nil { + return tx, true, nil + } + tx, _, _, _ = rawdb.ReadTransaction(b.database, txHash) + if tx != nil { + return tx, false, nil + } + return nil, false, ethereum.NotFound +} + +// PendingCodeAt returns the code associated with an account in the pending state. +func (b *SimulatedBackend) PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) { + b.mu.Lock() + defer b.mu.Unlock() + + return b.pendingState.GetCode(contract), nil +} + +// CallContract executes a contract call. +func (b *SimulatedBackend) CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error) { + b.mu.Lock() + defer b.mu.Unlock() + + if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 { + return nil, errBlockNumberUnsupported + } + state, err := b.blockchain.State() + if err != nil { + return nil, err + } + rval, _, _, err := b.callContract(ctx, call, b.blockchain.CurrentBlock(), state) + return rval, err +} + +// PendingCallContract executes a contract call on the pending state. +func (b *SimulatedBackend) PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error) { + b.mu.Lock() + defer b.mu.Unlock() + defer b.pendingState.RevertToSnapshot(b.pendingState.Snapshot()) + + rval, _, _, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState) + return rval, err +} + +// PendingNonceAt implements PendingStateReader.PendingNonceAt, retrieving +// the nonce currently pending for the account. +func (b *SimulatedBackend) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) { + b.mu.Lock() + defer b.mu.Unlock() + + return b.pendingState.GetOrNewStateObject(account).Nonce(), nil +} + +// SuggestGasPrice implements ContractTransactor.SuggestGasPrice. Since the simulated +// chain doesn't have miners, we just return a gas price of 1 for any call. +func (b *SimulatedBackend) SuggestGasPrice(ctx context.Context) (*big.Int, error) { + return big.NewInt(1), nil +} + +// EstimateGas executes the requested code against the currently pending block/state and +// returns the used amount of gas. +func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMsg) (uint64, error) { + b.mu.Lock() + defer b.mu.Unlock() + + // Determine the lowest and highest possible gas limits to binary search in between + var ( + lo uint64 = params.TxGas - 1 + hi uint64 + cap uint64 + ) + if call.Gas >= params.TxGas { + hi = call.Gas + } else { + hi = b.pendingBlock.GasLimit() + } + cap = hi + + // Create a helper to check if a gas allowance results in an executable transaction + executable := func(gas uint64) bool { + call.Gas = gas + + snapshot := b.pendingState.Snapshot() + _, _, failed, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState) + b.pendingState.RevertToSnapshot(snapshot) + + if err != nil || failed { + return false + } + return true + } + // Execute the binary search and hone in on an executable gas limit + for lo+1 < hi { + mid := (hi + lo) / 2 + if !executable(mid) { + lo = mid + } else { + hi = mid + } + } + // Reject the transaction as invalid if it still fails at the highest allowance + if hi == cap { + if !executable(hi) { + return 0, errGasEstimationFailed + } + } + return hi, nil +} + +// callContract implements common code between normal and pending contract calls. +// state is modified during execution, make sure to copy it if necessary. +func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallMsg, block *types.Block, statedb *state.StateDB) ([]byte, uint64, bool, error) { + // Ensure message is initialized properly. + if call.GasPrice == nil { + call.GasPrice = big.NewInt(1) + } + if call.Gas == 0 { + call.Gas = 50000000 + } + if call.Value == nil { + call.Value = new(big.Int) + } + // Set infinite balance to the fake caller account. + from := statedb.GetOrNewStateObject(call.From) + from.SetBalance(math.MaxBig256) + // Execute the call. + msg := callmsg{call} + + evmContext := core.NewEVMContext(msg, block.Header(), b.blockchain, nil) + // Create a new environment which holds all relevant information + // about the transaction and calling mechanisms. + vmenv := vm.NewEVM(evmContext, statedb, b.config, vm.Config{}) + gaspool := new(core.GasPool).AddGas(math.MaxUint64) + + return core.NewStateTransition(vmenv, msg, gaspool).TransitionDb() +} + +// SendTransaction updates the pending block to include the given transaction. +// It panics if the transaction is invalid. +func (b *SimulatedBackend) SendTransaction(ctx context.Context, tx *types.Transaction) error { + b.mu.Lock() + defer b.mu.Unlock() + + sender, err := types.Sender(types.NewEIP155Signer(b.config.ChainID), tx) + if err != nil { + panic(fmt.Errorf("invalid transaction: %v", err)) + } + nonce := b.pendingState.GetNonce(sender) + if tx.Nonce() != nonce { + panic(fmt.Errorf("invalid transaction nonce: got %d, want %d", tx.Nonce(), nonce)) + } + + blocks, _ := core.GenerateChain(b.config, b.blockchain.CurrentBlock(), ethash.NewFaker(), b.database, 1, func(number int, block *core.BlockGen) { + for _, tx := range b.pendingBlock.Transactions() { + block.AddTxWithChain(b.blockchain, tx) + } + block.AddTxWithChain(b.blockchain, tx) + }) + statedb, _ := b.blockchain.State() + + b.pendingBlock = blocks[0] + b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database()) + return nil +} + +// FilterLogs executes a log filter operation, blocking during execution and +// returning all the results in one batch. +// +// TODO(karalabe): Deprecate when the subscription one can return past data too. +func (b *SimulatedBackend) FilterLogs(ctx context.Context, query ethereum.FilterQuery) ([]types.Log, error) { + var filter *filters.Filter + if query.BlockHash != nil { + // Block filter requested, construct a single-shot filter + filter = filters.NewBlockFilter(&filterBackend{b.database, b.blockchain}, *query.BlockHash, query.Addresses, query.Topics) + } else { + // Initialize unset filter boundaried to run from genesis to chain head + from := int64(0) + if query.FromBlock != nil { + from = query.FromBlock.Int64() + } + to := int64(-1) + if query.ToBlock != nil { + to = query.ToBlock.Int64() + } + // Construct the range filter + filter = filters.NewRangeFilter(&filterBackend{b.database, b.blockchain}, from, to, query.Addresses, query.Topics) + } + // Run the filter and return all the logs + logs, err := filter.Logs(ctx) + if err != nil { + return nil, err + } + res := make([]types.Log, len(logs)) + for i, log := range logs { + res[i] = *log + } + return res, nil +} + +// SubscribeFilterLogs creates a background log filtering operation, returning a +// subscription immediately, which can be used to stream the found events. +func (b *SimulatedBackend) SubscribeFilterLogs(ctx context.Context, query ethereum.FilterQuery, ch chan<- types.Log) (ethereum.Subscription, error) { + // Subscribe to contract events + sink := make(chan []*types.Log) + + sub, err := b.events.SubscribeLogs(query, sink) + if err != nil { + return nil, err + } + // Since we're getting logs in batches, we need to flatten them into a plain stream + return event.NewSubscription(func(quit <-chan struct{}) error { + defer sub.Unsubscribe() + for { + select { + case logs := <-sink: + for _, log := range logs { + select { + case ch <- *log: + case err := <-sub.Err(): + return err + case <-quit: + return nil + } + } + case err := <-sub.Err(): + return err + case <-quit: + return nil + } + } + }), nil +} + +// AdjustTime adds a time shift to the simulated clock. +func (b *SimulatedBackend) AdjustTime(adjustment time.Duration) error { + b.mu.Lock() + defer b.mu.Unlock() + blocks, _ := core.GenerateChain(b.config, b.blockchain.CurrentBlock(), ethash.NewFaker(), b.database, 1, func(number int, block *core.BlockGen) { + for _, tx := range b.pendingBlock.Transactions() { + block.AddTx(tx) + } + block.OffsetTime(int64(adjustment.Seconds())) + }) + statedb, _ := b.blockchain.State() + + b.pendingBlock = blocks[0] + b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database()) + + return nil +} + +// Blockchain returns the underlying blockchain. +func (b *SimulatedBackend) Blockchain() *core.BlockChain { + return b.blockchain +} + +// callmsg implements core.Message to allow passing it as a transaction simulator. +type callmsg struct { + ethereum.CallMsg +} + +func (m callmsg) From() common.Address { return m.CallMsg.From } +func (m callmsg) Nonce() uint64 { return 0 } +func (m callmsg) CheckNonce() bool { return false } +func (m callmsg) To() *common.Address { return m.CallMsg.To } +func (m callmsg) GasPrice() *big.Int { return m.CallMsg.GasPrice } +func (m callmsg) Gas() uint64 { return m.CallMsg.Gas } +func (m callmsg) Value() *big.Int { return m.CallMsg.Value } +func (m callmsg) Data() []byte { return m.CallMsg.Data } + +// filterBackend implements filters.Backend to support filtering for logs without +// taking bloom-bits acceleration structures into account. +type filterBackend struct { + db ethdb.Database + bc *core.BlockChain +} + +func (fb *filterBackend) ChainDb() ethdb.Database { return fb.db } +func (fb *filterBackend) EventMux() *event.TypeMux { panic("not supported") } + +func (fb *filterBackend) HeaderByNumber(ctx context.Context, block rpc.BlockNumber) (*types.Header, error) { + if block == rpc.LatestBlockNumber { + return fb.bc.CurrentHeader(), nil + } + return fb.bc.GetHeaderByNumber(uint64(block.Int64())), nil +} + +func (fb *filterBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error) { + return fb.bc.GetHeaderByHash(hash), nil +} + +func (fb *filterBackend) GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error) { + number := rawdb.ReadHeaderNumber(fb.db, hash) + if number == nil { + return nil, nil + } + return rawdb.ReadReceipts(fb.db, hash, *number, fb.bc.Config()), nil +} + +func (fb *filterBackend) GetLogs(ctx context.Context, hash common.Hash) ([][]*types.Log, error) { + number := rawdb.ReadHeaderNumber(fb.db, hash) + if number == nil { + return nil, nil + } + receipts := rawdb.ReadReceipts(fb.db, hash, *number, fb.bc.Config()) + if receipts == nil { + return nil, nil + } + logs := make([][]*types.Log, len(receipts)) + for i, receipt := range receipts { + logs[i] = receipt.Logs + } + return logs, nil +} + +func (fb *filterBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription { + return event.NewSubscription(func(quit <-chan struct{}) error { + <-quit + return nil + }) +} +func (fb *filterBackend) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription { + return fb.bc.SubscribeChainEvent(ch) +} +func (fb *filterBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription { + return fb.bc.SubscribeRemovedLogsEvent(ch) +} +func (fb *filterBackend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription { + return fb.bc.SubscribeLogsEvent(ch) +} + +func (fb *filterBackend) BloomStatus() (uint64, uint64) { return 4096, 0 } +func (fb *filterBackend) ServiceFilter(ctx context.Context, ms *bloombits.MatcherSession) { + panic("not supported") +} diff --git a/accounts/abi/bind/base.go b/accounts/abi/bind/base.go new file mode 100644 index 0000000..3d64f85 --- /dev/null +++ b/accounts/abi/bind/base.go @@ -0,0 +1,366 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package bind + +import ( + "context" + "errors" + "fmt" + "math/big" + + "github.com/ava-labs/coreth/accounts/abi" + "github.com/ava-labs/coreth/core/types" + "github.com/ava-labs/go-ethereum" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/crypto" + "github.com/ava-labs/go-ethereum/event" +) + +// SignerFn is a signer function callback when a contract requires a method to +// sign the transaction before submission. +type SignerFn func(types.Signer, common.Address, *types.Transaction) (*types.Transaction, error) + +// CallOpts is the collection of options to fine tune a contract call request. +type CallOpts struct { + Pending bool // Whether to operate on the pending state or the last known one + From common.Address // Optional the sender address, otherwise the first account is used + BlockNumber *big.Int // Optional the block number on which the call should be performed + Context context.Context // Network context to support cancellation and timeouts (nil = no timeout) +} + +// TransactOpts is the collection of authorization data required to create a +// valid Ethereum transaction. +type TransactOpts struct { + From common.Address // Ethereum account to send the transaction from + Nonce *big.Int // Nonce to use for the transaction execution (nil = use pending state) + Signer SignerFn // Method to use for signing the transaction (mandatory) + + Value *big.Int // Funds to transfer along along the transaction (nil = 0 = no funds) + GasPrice *big.Int // Gas price to use for the transaction execution (nil = gas price oracle) + GasLimit uint64 // Gas limit to set for the transaction execution (0 = estimate) + + Context context.Context // Network context to support cancellation and timeouts (nil = no timeout) +} + +// FilterOpts is the collection of options to fine tune filtering for events +// within a bound contract. +type FilterOpts struct { + Start uint64 // Start of the queried range + End *uint64 // End of the range (nil = latest) + + Context context.Context // Network context to support cancellation and timeouts (nil = no timeout) +} + +// WatchOpts is the collection of options to fine tune subscribing for events +// within a bound contract. +type WatchOpts struct { + Start *uint64 // Start of the queried range (nil = latest) + Context context.Context // Network context to support cancellation and timeouts (nil = no timeout) +} + +// BoundContract is the base wrapper object that reflects a contract on the +// Ethereum network. It contains a collection of methods that are used by the +// higher level contract bindings to operate. +type BoundContract struct { + address common.Address // Deployment address of the contract on the Ethereum blockchain + abi abi.ABI // Reflect based ABI to access the correct Ethereum methods + caller ContractCaller // Read interface to interact with the blockchain + transactor ContractTransactor // Write interface to interact with the blockchain + filterer ContractFilterer // Event filtering to interact with the blockchain +} + +// NewBoundContract creates a low level contract interface through which calls +// and transactions may be made through. +func NewBoundContract(address common.Address, abi abi.ABI, caller ContractCaller, transactor ContractTransactor, filterer ContractFilterer) *BoundContract { + return &BoundContract{ + address: address, + abi: abi, + caller: caller, + transactor: transactor, + filterer: filterer, + } +} + +// DeployContract deploys a contract onto the Ethereum blockchain and binds the +// deployment address with a Go wrapper. +func DeployContract(opts *TransactOpts, abi abi.ABI, bytecode []byte, backend ContractBackend, params ...interface{}) (common.Address, *types.Transaction, *BoundContract, error) { + // Otherwise try to deploy the contract + c := NewBoundContract(common.Address{}, abi, backend, backend, backend) + + input, err := c.abi.Pack("", params...) + if err != nil { + return common.Address{}, nil, nil, err + } + tx, err := c.transact(opts, nil, append(bytecode, input...)) + if err != nil { + return common.Address{}, nil, nil, err + } + c.address = crypto.CreateAddress(opts.From, tx.Nonce()) + return c.address, tx, c, nil +} + +// Call invokes the (constant) contract method with params as input values and +// sets the output to result. The result type might be a single field for simple +// returns, a slice of interfaces for anonymous returns and a struct for named +// returns. +func (c *BoundContract) Call(opts *CallOpts, result interface{}, method string, params ...interface{}) error { + // Don't crash on a lazy user + if opts == nil { + opts = new(CallOpts) + } + // Pack the input, call and unpack the results + input, err := c.abi.Pack(method, params...) + if err != nil { + return err + } + var ( + msg = ethereum.CallMsg{From: opts.From, To: &c.address, Data: input} + ctx = ensureContext(opts.Context) + code []byte + output []byte + ) + if opts.Pending { + pb, ok := c.caller.(PendingContractCaller) + if !ok { + return ErrNoPendingState + } + output, err = pb.PendingCallContract(ctx, msg) + if err == nil && len(output) == 0 { + // Make sure we have a contract to operate on, and bail out otherwise. + if code, err = pb.PendingCodeAt(ctx, c.address); err != nil { + return err + } else if len(code) == 0 { + return ErrNoCode + } + } + } else { + output, err = c.caller.CallContract(ctx, msg, opts.BlockNumber) + if err == nil && len(output) == 0 { + // Make sure we have a contract to operate on, and bail out otherwise. + if code, err = c.caller.CodeAt(ctx, c.address, opts.BlockNumber); err != nil { + return err + } else if len(code) == 0 { + return ErrNoCode + } + } + } + if err != nil { + return err + } + return c.abi.Unpack(result, method, output) +} + +// Transact invokes the (paid) contract method with params as input values. +func (c *BoundContract) Transact(opts *TransactOpts, method string, params ...interface{}) (*types.Transaction, error) { + // Otherwise pack up the parameters and invoke the contract + input, err := c.abi.Pack(method, params...) + if err != nil { + return nil, err + } + return c.transact(opts, &c.address, input) +} + +// Transfer initiates a plain transaction to move funds to the contract, calling +// its default method if one is available. +func (c *BoundContract) Transfer(opts *TransactOpts) (*types.Transaction, error) { + return c.transact(opts, &c.address, nil) +} + +// transact executes an actual transaction invocation, first deriving any missing +// authorization fields, and then scheduling the transaction for execution. +func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, input []byte) (*types.Transaction, error) { + var err error + + // Ensure a valid value field and resolve the account nonce + value := opts.Value + if value == nil { + value = new(big.Int) + } + var nonce uint64 + if opts.Nonce == nil { + nonce, err = c.transactor.PendingNonceAt(ensureContext(opts.Context), opts.From) + if err != nil { + return nil, fmt.Errorf("failed to retrieve account nonce: %v", err) + } + } else { + nonce = opts.Nonce.Uint64() + } + // Figure out the gas allowance and gas price values + gasPrice := opts.GasPrice + if gasPrice == nil { + gasPrice, err = c.transactor.SuggestGasPrice(ensureContext(opts.Context)) + if err != nil { + return nil, fmt.Errorf("failed to suggest gas price: %v", err) + } + } + gasLimit := opts.GasLimit + if gasLimit == 0 { + // Gas estimation cannot succeed without code for method invocations + if contract != nil { + if code, err := c.transactor.PendingCodeAt(ensureContext(opts.Context), c.address); err != nil { + return nil, err + } else if len(code) == 0 { + return nil, ErrNoCode + } + } + // If the contract surely has code (or code is not needed), estimate the transaction + msg := ethereum.CallMsg{From: opts.From, To: contract, Value: value, Data: input} + gasLimit, err = c.transactor.EstimateGas(ensureContext(opts.Context), msg) + if err != nil { + return nil, fmt.Errorf("failed to estimate gas needed: %v", err) + } + } + // Create the transaction, sign it and schedule it for execution + var rawTx *types.Transaction + if contract == nil { + rawTx = types.NewContractCreation(nonce, value, gasLimit, gasPrice, input) + } else { + rawTx = types.NewTransaction(nonce, c.address, value, gasLimit, gasPrice, input) + } + if opts.Signer == nil { + return nil, errors.New("no signer to authorize the transaction with") + } + signedTx, err := opts.Signer(types.HomesteadSigner{}, opts.From, rawTx) + if err != nil { + return nil, err + } + if err := c.transactor.SendTransaction(ensureContext(opts.Context), signedTx); err != nil { + return nil, err + } + return signedTx, nil +} + +// FilterLogs filters contract logs for past blocks, returning the necessary +// channels to construct a strongly typed bound iterator on top of them. +func (c *BoundContract) FilterLogs(opts *FilterOpts, name string, query ...[]interface{}) (chan types.Log, event.Subscription, error) { + // Don't crash on a lazy user + if opts == nil { + opts = new(FilterOpts) + } + // Append the event selector to the query parameters and construct the topic set + query = append([][]interface{}{{c.abi.Events[name].ID()}}, query...) + + topics, err := makeTopics(query...) + if err != nil { + return nil, nil, err + } + // Start the background filtering + logs := make(chan types.Log, 128) + + config := ethereum.FilterQuery{ + Addresses: []common.Address{c.address}, + Topics: topics, + FromBlock: new(big.Int).SetUint64(opts.Start), + } + if opts.End != nil { + config.ToBlock = new(big.Int).SetUint64(*opts.End) + } + /* TODO(karalabe): Replace the rest of the method below with this when supported + sub, err := c.filterer.SubscribeFilterLogs(ensureContext(opts.Context), config, logs) + */ + buff, err := c.filterer.FilterLogs(ensureContext(opts.Context), config) + if err != nil { + return nil, nil, err + } + sub, err := event.NewSubscription(func(quit <-chan struct{}) error { + for _, log := range buff { + select { + case logs <- log: + case <-quit: + return nil + } + } + return nil + }), nil + + if err != nil { + return nil, nil, err + } + return logs, sub, nil +} + +// WatchLogs filters subscribes to contract logs for future blocks, returning a +// subscription object that can be used to tear down the watcher. +func (c *BoundContract) WatchLogs(opts *WatchOpts, name string, query ...[]interface{}) (chan types.Log, event.Subscription, error) { + // Don't crash on a lazy user + if opts == nil { + opts = new(WatchOpts) + } + // Append the event selector to the query parameters and construct the topic set + query = append([][]interface{}{{c.abi.Events[name].ID()}}, query...) + + topics, err := makeTopics(query...) + if err != nil { + return nil, nil, err + } + // Start the background filtering + logs := make(chan types.Log, 128) + + config := ethereum.FilterQuery{ + Addresses: []common.Address{c.address}, + Topics: topics, + } + if opts.Start != nil { + config.FromBlock = new(big.Int).SetUint64(*opts.Start) + } + sub, err := c.filterer.SubscribeFilterLogs(ensureContext(opts.Context), config, logs) + if err != nil { + return nil, nil, err + } + return logs, sub, nil +} + +// UnpackLog unpacks a retrieved log into the provided output structure. +func (c *BoundContract) UnpackLog(out interface{}, event string, log types.Log) error { + if len(log.Data) > 0 { + if err := c.abi.Unpack(out, event, log.Data); err != nil { + return err + } + } + var indexed abi.Arguments + for _, arg := range c.abi.Events[event].Inputs { + if arg.Indexed { + indexed = append(indexed, arg) + } + } + return parseTopics(out, indexed, log.Topics[1:]) +} + +// UnpackLogIntoMap unpacks a retrieved log into the provided map. +func (c *BoundContract) UnpackLogIntoMap(out map[string]interface{}, event string, log types.Log) error { + if len(log.Data) > 0 { + if err := c.abi.UnpackIntoMap(out, event, log.Data); err != nil { + return err + } + } + var indexed abi.Arguments + for _, arg := range c.abi.Events[event].Inputs { + if arg.Indexed { + indexed = append(indexed, arg) + } + } + return parseTopicsIntoMap(out, indexed, log.Topics[1:]) +} + +// ensureContext is a helper method to ensure a context is not nil, even if the +// user specified it as such. +func ensureContext(ctx context.Context) context.Context { + if ctx == nil { + return context.TODO() + } + return ctx +} diff --git a/accounts/abi/bind/bind.go b/accounts/abi/bind/bind.go new file mode 100644 index 0000000..e869eef --- /dev/null +++ b/accounts/abi/bind/bind.go @@ -0,0 +1,558 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +// Package bind generates Ethereum contract Go bindings. +// +// Detailed usage document and tutorial available on the go-ethereum Wiki page: +// https://github.com/ethereum/go-ethereum/wiki/Native-DApps:-Go-bindings-to-Ethereum-contracts +package bind + +import ( + "bytes" + "errors" + "fmt" + "go/format" + "regexp" + "strings" + "text/template" + "unicode" + + "github.com/ava-labs/coreth/accounts/abi" + "github.com/ava-labs/go-ethereum/log" +) + +// Lang is a target programming language selector to generate bindings for. +type Lang int + +const ( + LangGo Lang = iota + LangJava + LangObjC +) + +// Bind generates a Go wrapper around a contract ABI. This wrapper isn't meant +// to be used as is in client code, but rather as an intermediate struct which +// enforces compile time type safety and naming convention opposed to having to +// manually maintain hard coded strings that break on runtime. +func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]string, pkg string, lang Lang, libs map[string]string) (string, error) { + // Process each individual contract requested binding + contracts := make(map[string]*tmplContract) + + // Map used to flag each encountered library as such + isLib := make(map[string]struct{}) + + for i := 0; i < len(types); i++ { + // Parse the actual ABI to generate the binding for + evmABI, err := abi.JSON(strings.NewReader(abis[i])) + if err != nil { + return "", err + } + // Strip any whitespace from the JSON ABI + strippedABI := strings.Map(func(r rune) rune { + if unicode.IsSpace(r) { + return -1 + } + return r + }, abis[i]) + + // Extract the call and transact methods; events, struct definitions; and sort them alphabetically + var ( + calls = make(map[string]*tmplMethod) + transacts = make(map[string]*tmplMethod) + events = make(map[string]*tmplEvent) + structs = make(map[string]*tmplStruct) + ) + for _, original := range evmABI.Methods { + // Normalize the method for capital cases and non-anonymous inputs/outputs + normalized := original + normalized.Name = methodNormalizer[lang](original.Name) + + normalized.Inputs = make([]abi.Argument, len(original.Inputs)) + copy(normalized.Inputs, original.Inputs) + for j, input := range normalized.Inputs { + if input.Name == "" { + normalized.Inputs[j].Name = fmt.Sprintf("arg%d", j) + } + if _, exist := structs[input.Type.String()]; input.Type.T == abi.TupleTy && !exist { + bindStructType[lang](input.Type, structs) + } + } + normalized.Outputs = make([]abi.Argument, len(original.Outputs)) + copy(normalized.Outputs, original.Outputs) + for j, output := range normalized.Outputs { + if output.Name != "" { + normalized.Outputs[j].Name = capitalise(output.Name) + } + if _, exist := structs[output.Type.String()]; output.Type.T == abi.TupleTy && !exist { + bindStructType[lang](output.Type, structs) + } + } + // Append the methods to the call or transact lists + if original.Const { + calls[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original.Outputs)} + } else { + transacts[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original.Outputs)} + } + } + for _, original := range evmABI.Events { + // Skip anonymous events as they don't support explicit filtering + if original.Anonymous { + continue + } + // Normalize the event for capital cases and non-anonymous outputs + normalized := original + normalized.Name = methodNormalizer[lang](original.Name) + + normalized.Inputs = make([]abi.Argument, len(original.Inputs)) + copy(normalized.Inputs, original.Inputs) + for j, input := range normalized.Inputs { + // Indexed fields are input, non-indexed ones are outputs + if input.Indexed { + if input.Name == "" { + normalized.Inputs[j].Name = fmt.Sprintf("arg%d", j) + } + if _, exist := structs[input.Type.String()]; input.Type.T == abi.TupleTy && !exist { + bindStructType[lang](input.Type, structs) + } + } + } + // Append the event to the accumulator list + events[original.Name] = &tmplEvent{Original: original, Normalized: normalized} + } + + // There is no easy way to pass arbitrary java objects to the Go side. + if len(structs) > 0 && lang == LangJava { + return "", errors.New("java binding for tuple arguments is not supported yet") + } + + contracts[types[i]] = &tmplContract{ + Type: capitalise(types[i]), + InputABI: strings.Replace(strippedABI, "\"", "\\\"", -1), + InputBin: strings.TrimPrefix(strings.TrimSpace(bytecodes[i]), "0x"), + Constructor: evmABI.Constructor, + Calls: calls, + Transacts: transacts, + Events: events, + Libraries: make(map[string]string), + Structs: structs, + } + // Function 4-byte signatures are stored in the same sequence + // as types, if available. + if len(fsigs) > i { + contracts[types[i]].FuncSigs = fsigs[i] + } + // Parse library references. + for pattern, name := range libs { + matched, err := regexp.Match("__\\$"+pattern+"\\$__", []byte(contracts[types[i]].InputBin)) + if err != nil { + log.Error("Could not search for pattern", "pattern", pattern, "contract", contracts[types[i]], "err", err) + } + if matched { + contracts[types[i]].Libraries[pattern] = name + // keep track that this type is a library + if _, ok := isLib[name]; !ok { + isLib[name] = struct{}{} + } + } + } + } + // Check if that type has already been identified as a library + for i := 0; i < len(types); i++ { + _, ok := isLib[types[i]] + contracts[types[i]].Library = ok + } + // Generate the contract template data content and render it + data := &tmplData{ + Package: pkg, + Contracts: contracts, + Libraries: libs, + } + buffer := new(bytes.Buffer) + + funcs := map[string]interface{}{ + "bindtype": bindType[lang], + "bindtopictype": bindTopicType[lang], + "namedtype": namedType[lang], + "formatmethod": formatMethod, + "formatevent": formatEvent, + "capitalise": capitalise, + "decapitalise": decapitalise, + } + tmpl := template.Must(template.New("").Funcs(funcs).Parse(tmplSource[lang])) + if err := tmpl.Execute(buffer, data); err != nil { + return "", err + } + // For Go bindings pass the code through gofmt to clean it up + if lang == LangGo { + code, err := format.Source(buffer.Bytes()) + if err != nil { + return "", fmt.Errorf("%v\n%s", err, buffer) + } + return string(code), nil + } + // For all others just return as is for now + return buffer.String(), nil +} + +// bindType is a set of type binders that convert Solidity types to some supported +// programming language types. +var bindType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) string{ + LangGo: bindTypeGo, + LangJava: bindTypeJava, +} + +// bindBasicTypeGo converts basic solidity types(except array, slice and tuple) to Go one. +func bindBasicTypeGo(kind abi.Type) string { + switch kind.T { + case abi.AddressTy: + return "common.Address" + case abi.IntTy, abi.UintTy: + parts := regexp.MustCompile(`(u)?int([0-9]*)`).FindStringSubmatch(kind.String()) + switch parts[2] { + case "8", "16", "32", "64": + return fmt.Sprintf("%sint%s", parts[1], parts[2]) + } + return "*big.Int" + case abi.FixedBytesTy: + return fmt.Sprintf("[%d]byte", kind.Size) + case abi.BytesTy: + return "[]byte" + case abi.FunctionTy: + return "[24]byte" + default: + // string, bool types + return kind.String() + } +} + +// bindTypeGo converts solidity types to Go ones. Since there is no clear mapping +// from all Solidity types to Go ones (e.g. uint17), those that cannot be exactly +// mapped will use an upscaled type (e.g. BigDecimal). +func bindTypeGo(kind abi.Type, structs map[string]*tmplStruct) string { + switch kind.T { + case abi.TupleTy: + return structs[kind.String()].Name + case abi.ArrayTy: + return fmt.Sprintf("[%d]", kind.Size) + bindTypeGo(*kind.Elem, structs) + case abi.SliceTy: + return "[]" + bindTypeGo(*kind.Elem, structs) + default: + return bindBasicTypeGo(kind) + } +} + +// bindBasicTypeJava converts basic solidity types(except array, slice and tuple) to Java one. +func bindBasicTypeJava(kind abi.Type) string { + switch kind.T { + case abi.AddressTy: + return "Address" + case abi.IntTy, abi.UintTy: + // Note that uint and int (without digits) are also matched, + // these are size 256, and will translate to BigInt (the default). + parts := regexp.MustCompile(`(u)?int([0-9]*)`).FindStringSubmatch(kind.String()) + if len(parts) != 3 { + return kind.String() + } + // All unsigned integers should be translated to BigInt since gomobile doesn't + // support them. + if parts[1] == "u" { + return "BigInt" + } + + namedSize := map[string]string{ + "8": "byte", + "16": "short", + "32": "int", + "64": "long", + }[parts[2]] + + // default to BigInt + if namedSize == "" { + namedSize = "BigInt" + } + return namedSize + case abi.FixedBytesTy, abi.BytesTy: + return "byte[]" + case abi.BoolTy: + return "boolean" + case abi.StringTy: + return "String" + case abi.FunctionTy: + return "byte[24]" + default: + return kind.String() + } +} + +// pluralizeJavaType explicitly converts multidimensional types to predefined +// type in go side. +func pluralizeJavaType(typ string) string { + switch typ { + case "boolean": + return "Bools" + case "String": + return "Strings" + case "Address": + return "Addresses" + case "byte[]": + return "Binaries" + case "BigInt": + return "BigInts" + } + return typ + "[]" +} + +// bindTypeJava converts a Solidity type to a Java one. Since there is no clear mapping +// from all Solidity types to Java ones (e.g. uint17), those that cannot be exactly +// mapped will use an upscaled type (e.g. BigDecimal). +func bindTypeJava(kind abi.Type, structs map[string]*tmplStruct) string { + switch kind.T { + case abi.TupleTy: + return structs[kind.String()].Name + case abi.ArrayTy, abi.SliceTy: + return pluralizeJavaType(bindTypeJava(*kind.Elem, structs)) + default: + return bindBasicTypeJava(kind) + } +} + +// bindTopicType is a set of type binders that convert Solidity types to some +// supported programming language topic types. +var bindTopicType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) string{ + LangGo: bindTopicTypeGo, + LangJava: bindTopicTypeJava, +} + +// bindTopicTypeGo converts a Solidity topic type to a Go one. It is almost the same +// funcionality as for simple types, but dynamic types get converted to hashes. +func bindTopicTypeGo(kind abi.Type, structs map[string]*tmplStruct) string { + bound := bindTypeGo(kind, structs) + if bound == "string" || bound == "[]byte" { + bound = "common.Hash" + } + return bound +} + +// bindTopicTypeJava converts a Solidity topic type to a Java one. It is almost the same +// funcionality as for simple types, but dynamic types get converted to hashes. +func bindTopicTypeJava(kind abi.Type, structs map[string]*tmplStruct) string { + bound := bindTypeJava(kind, structs) + if bound == "String" || bound == "byte[]" { + bound = "Hash" + } + return bound +} + +// bindStructType is a set of type binders that convert Solidity tuple types to some supported +// programming language struct definition. +var bindStructType = map[Lang]func(kind abi.Type, structs map[string]*tmplStruct) string{ + LangGo: bindStructTypeGo, + LangJava: bindStructTypeJava, +} + +// bindStructTypeGo converts a Solidity tuple type to a Go one and records the mapping +// in the given map. +// Notably, this function will resolve and record nested struct recursively. +func bindStructTypeGo(kind abi.Type, structs map[string]*tmplStruct) string { + switch kind.T { + case abi.TupleTy: + if s, exist := structs[kind.String()]; exist { + return s.Name + } + var fields []*tmplField + for i, elem := range kind.TupleElems { + field := bindStructTypeGo(*elem, structs) + fields = append(fields, &tmplField{Type: field, Name: capitalise(kind.TupleRawNames[i]), SolKind: *elem}) + } + name := fmt.Sprintf("Struct%d", len(structs)) + structs[kind.String()] = &tmplStruct{ + Name: name, + Fields: fields, + } + return name + case abi.ArrayTy: + return fmt.Sprintf("[%d]", kind.Size) + bindStructTypeGo(*kind.Elem, structs) + case abi.SliceTy: + return "[]" + bindStructTypeGo(*kind.Elem, structs) + default: + return bindBasicTypeGo(kind) + } +} + +// bindStructTypeJava converts a Solidity tuple type to a Java one and records the mapping +// in the given map. +// Notably, this function will resolve and record nested struct recursively. +func bindStructTypeJava(kind abi.Type, structs map[string]*tmplStruct) string { + switch kind.T { + case abi.TupleTy: + if s, exist := structs[kind.String()]; exist { + return s.Name + } + var fields []*tmplField + for i, elem := range kind.TupleElems { + field := bindStructTypeJava(*elem, structs) + fields = append(fields, &tmplField{Type: field, Name: decapitalise(kind.TupleRawNames[i]), SolKind: *elem}) + } + name := fmt.Sprintf("Class%d", len(structs)) + structs[kind.String()] = &tmplStruct{ + Name: name, + Fields: fields, + } + return name + case abi.ArrayTy, abi.SliceTy: + return pluralizeJavaType(bindStructTypeJava(*kind.Elem, structs)) + default: + return bindBasicTypeJava(kind) + } +} + +// namedType is a set of functions that transform language specific types to +// named versions that my be used inside method names. +var namedType = map[Lang]func(string, abi.Type) string{ + LangGo: func(string, abi.Type) string { panic("this shouldn't be needed") }, + LangJava: namedTypeJava, +} + +// namedTypeJava converts some primitive data types to named variants that can +// be used as parts of method names. +func namedTypeJava(javaKind string, solKind abi.Type) string { + switch javaKind { + case "byte[]": + return "Binary" + case "boolean": + return "Bool" + default: + parts := regexp.MustCompile(`(u)?int([0-9]*)(\[[0-9]*\])?`).FindStringSubmatch(solKind.String()) + if len(parts) != 4 { + return javaKind + } + switch parts[2] { + case "8", "16", "32", "64": + if parts[3] == "" { + return capitalise(fmt.Sprintf("%sint%s", parts[1], parts[2])) + } + return capitalise(fmt.Sprintf("%sint%ss", parts[1], parts[2])) + + default: + return javaKind + } + } +} + +// methodNormalizer is a name transformer that modifies Solidity method names to +// conform to target language naming concentions. +var methodNormalizer = map[Lang]func(string) string{ + LangGo: abi.ToCamelCase, + LangJava: decapitalise, +} + +// capitalise makes a camel-case string which starts with an upper case character. +func capitalise(input string) string { + return abi.ToCamelCase(input) +} + +// decapitalise makes a camel-case string which starts with a lower case character. +func decapitalise(input string) string { + if len(input) == 0 { + return input + } + + goForm := abi.ToCamelCase(input) + return strings.ToLower(goForm[:1]) + goForm[1:] +} + +// structured checks whether a list of ABI data types has enough information to +// operate through a proper Go struct or if flat returns are needed. +func structured(args abi.Arguments) bool { + if len(args) < 2 { + return false + } + exists := make(map[string]bool) + for _, out := range args { + // If the name is anonymous, we can't organize into a struct + if out.Name == "" { + return false + } + // If the field name is empty when normalized or collides (var, Var, _var, _Var), + // we can't organize into a struct + field := capitalise(out.Name) + if field == "" || exists[field] { + return false + } + exists[field] = true + } + return true +} + +// resolveArgName converts a raw argument representation into a user friendly format. +func resolveArgName(arg abi.Argument, structs map[string]*tmplStruct) string { + var ( + prefix string + embedded string + typ = &arg.Type + ) +loop: + for { + switch typ.T { + case abi.SliceTy: + prefix += "[]" + case abi.ArrayTy: + prefix += fmt.Sprintf("[%d]", typ.Size) + default: + embedded = typ.String() + break loop + } + typ = typ.Elem + } + if s, exist := structs[embedded]; exist { + return prefix + s.Name + } else { + return arg.Type.String() + } +} + +// formatMethod transforms raw method representation into a user friendly one. +func formatMethod(method abi.Method, structs map[string]*tmplStruct) string { + inputs := make([]string, len(method.Inputs)) + for i, input := range method.Inputs { + inputs[i] = fmt.Sprintf("%v %v", resolveArgName(input, structs), input.Name) + } + outputs := make([]string, len(method.Outputs)) + for i, output := range method.Outputs { + outputs[i] = resolveArgName(output, structs) + if len(output.Name) > 0 { + outputs[i] += fmt.Sprintf(" %v", output.Name) + } + } + constant := "" + if method.Const { + constant = "constant " + } + return fmt.Sprintf("function %v(%v) %sreturns(%v)", method.RawName, strings.Join(inputs, ", "), constant, strings.Join(outputs, ", ")) +} + +// formatEvent transforms raw event representation into a user friendly one. +func formatEvent(event abi.Event, structs map[string]*tmplStruct) string { + inputs := make([]string, len(event.Inputs)) + for i, input := range event.Inputs { + if input.Indexed { + inputs[i] = fmt.Sprintf("%v indexed %v", resolveArgName(input, structs), input.Name) + } else { + inputs[i] = fmt.Sprintf("%v %v", resolveArgName(input, structs), input.Name) + } + } + return fmt.Sprintf("event %v(%v)", event.RawName, strings.Join(inputs, ", ")) +} diff --git a/accounts/abi/bind/template.go b/accounts/abi/bind/template.go new file mode 100644 index 0000000..e90d02e --- /dev/null +++ b/accounts/abi/bind/template.go @@ -0,0 +1,616 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package bind + +import "github.com/ava-labs/coreth/accounts/abi" + +// tmplData is the data structure required to fill the binding template. +type tmplData struct { + Package string // Name of the package to place the generated file in + Contracts map[string]*tmplContract // List of contracts to generate into this file + Libraries map[string]string // Map the bytecode's link pattern to the library name +} + +// tmplContract contains the data needed to generate an individual contract binding. +type tmplContract struct { + Type string // Type name of the main contract binding + InputABI string // JSON ABI used as the input to generate the binding from + InputBin string // Optional EVM bytecode used to denetare deploy code from + FuncSigs map[string]string // Optional map: string signature -> 4-byte signature + Constructor abi.Method // Contract constructor for deploy parametrization + Calls map[string]*tmplMethod // Contract calls that only read state data + Transacts map[string]*tmplMethod // Contract calls that write state data + Events map[string]*tmplEvent // Contract events accessors + Libraries map[string]string // Same as tmplData, but filtered to only keep what the contract needs + Structs map[string]*tmplStruct // Contract struct type definitions + Library bool +} + +// tmplMethod is a wrapper around an abi.Method that contains a few preprocessed +// and cached data fields. +type tmplMethod struct { + Original abi.Method // Original method as parsed by the abi package + Normalized abi.Method // Normalized version of the parsed method (capitalized names, non-anonymous args/returns) + Structured bool // Whether the returns should be accumulated into a struct +} + +// tmplEvent is a wrapper around an a +type tmplEvent struct { + Original abi.Event // Original event as parsed by the abi package + Normalized abi.Event // Normalized version of the parsed fields +} + +// tmplField is a wrapper around a struct field with binding language +// struct type definition and relative filed name. +type tmplField struct { + Type string // Field type representation depends on target binding language + Name string // Field name converted from the raw user-defined field name + SolKind abi.Type // Raw abi type information +} + +// tmplStruct is a wrapper around an abi.tuple contains a auto-generated +// struct name. +type tmplStruct struct { + Name string // Auto-generated struct name(We can't obtain the raw struct name through abi) + Fields []*tmplField // Struct fields definition depends on the binding language. +} + +// tmplSource is language to template mapping containing all the supported +// programming languages the package can generate to. +var tmplSource = map[Lang]string{ + LangGo: tmplSourceGo, + LangJava: tmplSourceJava, +} + +// tmplSourceGo is the Go source template use to generate the contract binding +// based on. +const tmplSourceGo = ` +// Code generated - DO NOT EDIT. +// This file is a generated binding and any manual changes will be lost. + +package {{.Package}} + +import ( + "math/big" + "strings" + + ethereum "github.com/ava-labs/go-ethereum" + "github.com/ava-labs/coreth/accounts/abi" + "github.com/ava-labs/coreth/accounts/abi/bind" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/coreth/core/types" + "github.com/ava-labs/go-ethereum/event" +) + +// Reference imports to suppress errors if they are not otherwise used. +var ( + _ = big.NewInt + _ = strings.NewReader + _ = ethereum.NotFound + _ = abi.U256 + _ = bind.Bind + _ = common.Big1 + _ = types.BloomLookup + _ = event.NewSubscription +) + +{{range $contract := .Contracts}} + {{$structs := $contract.Structs}} + // {{.Type}}ABI is the input ABI used to generate the binding from. + const {{.Type}}ABI = "{{.InputABI}}" + + {{if $contract.FuncSigs}} + // {{.Type}}FuncSigs maps the 4-byte function signature to its string representation. + var {{.Type}}FuncSigs = map[string]string{ + {{range $strsig, $binsig := .FuncSigs}}"{{$binsig}}": "{{$strsig}}", + {{end}} + } + {{end}} + + {{if .InputBin}} + // {{.Type}}Bin is the compiled bytecode used for deploying new contracts. + var {{.Type}}Bin = "0x{{.InputBin}}" + + // Deploy{{.Type}} deploys a new Ethereum contract, binding an instance of {{.Type}} to it. + func Deploy{{.Type}}(auth *bind.TransactOpts, backend bind.ContractBackend {{range .Constructor.Inputs}}, {{.Name}} {{bindtype .Type $structs}}{{end}}) (common.Address, *types.Transaction, *{{.Type}}, error) { + parsed, err := abi.JSON(strings.NewReader({{.Type}}ABI)) + if err != nil { + return common.Address{}, nil, nil, err + } + {{range $pattern, $name := .Libraries}} + {{decapitalise $name}}Addr, _, _, _ := Deploy{{capitalise $name}}(auth, backend) + {{$contract.Type}}Bin = strings.Replace({{$contract.Type}}Bin, "__${{$pattern}}$__", {{decapitalise $name}}Addr.String()[2:], -1) + {{end}} + address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex({{.Type}}Bin), backend {{range .Constructor.Inputs}}, {{.Name}}{{end}}) + if err != nil { + return common.Address{}, nil, nil, err + } + return address, tx, &{{.Type}}{ {{.Type}}Caller: {{.Type}}Caller{contract: contract}, {{.Type}}Transactor: {{.Type}}Transactor{contract: contract}, {{.Type}}Filterer: {{.Type}}Filterer{contract: contract} }, nil + } + {{end}} + + // {{.Type}} is an auto generated Go binding around an Ethereum contract. + type {{.Type}} struct { + {{.Type}}Caller // Read-only binding to the contract + {{.Type}}Transactor // Write-only binding to the contract + {{.Type}}Filterer // Log filterer for contract events + } + + // {{.Type}}Caller is an auto generated read-only Go binding around an Ethereum contract. + type {{.Type}}Caller struct { + contract *bind.BoundContract // Generic contract wrapper for the low level calls + } + + // {{.Type}}Transactor is an auto generated write-only Go binding around an Ethereum contract. + type {{.Type}}Transactor struct { + contract *bind.BoundContract // Generic contract wrapper for the low level calls + } + + // {{.Type}}Filterer is an auto generated log filtering Go binding around an Ethereum contract events. + type {{.Type}}Filterer struct { + contract *bind.BoundContract // Generic contract wrapper for the low level calls + } + + // {{.Type}}Session is an auto generated Go binding around an Ethereum contract, + // with pre-set call and transact options. + type {{.Type}}Session struct { + Contract *{{.Type}} // Generic contract binding to set the session for + CallOpts bind.CallOpts // Call options to use throughout this session + TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session + } + + // {{.Type}}CallerSession is an auto generated read-only Go binding around an Ethereum contract, + // with pre-set call options. + type {{.Type}}CallerSession struct { + Contract *{{.Type}}Caller // Generic contract caller binding to set the session for + CallOpts bind.CallOpts // Call options to use throughout this session + } + + // {{.Type}}TransactorSession is an auto generated write-only Go binding around an Ethereum contract, + // with pre-set transact options. + type {{.Type}}TransactorSession struct { + Contract *{{.Type}}Transactor // Generic contract transactor binding to set the session for + TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session + } + + // {{.Type}}Raw is an auto generated low-level Go binding around an Ethereum contract. + type {{.Type}}Raw struct { + Contract *{{.Type}} // Generic contract binding to access the raw methods on + } + + // {{.Type}}CallerRaw is an auto generated low-level read-only Go binding around an Ethereum contract. + type {{.Type}}CallerRaw struct { + Contract *{{.Type}}Caller // Generic read-only contract binding to access the raw methods on + } + + // {{.Type}}TransactorRaw is an auto generated low-level write-only Go binding around an Ethereum contract. + type {{.Type}}TransactorRaw struct { + Contract *{{.Type}}Transactor // Generic write-only contract binding to access the raw methods on + } + + // New{{.Type}} creates a new instance of {{.Type}}, bound to a specific deployed contract. + func New{{.Type}}(address common.Address, backend bind.ContractBackend) (*{{.Type}}, error) { + contract, err := bind{{.Type}}(address, backend, backend, backend) + if err != nil { + return nil, err + } + return &{{.Type}}{ {{.Type}}Caller: {{.Type}}Caller{contract: contract}, {{.Type}}Transactor: {{.Type}}Transactor{contract: contract}, {{.Type}}Filterer: {{.Type}}Filterer{contract: contract} }, nil + } + + // New{{.Type}}Caller creates a new read-only instance of {{.Type}}, bound to a specific deployed contract. + func New{{.Type}}Caller(address common.Address, caller bind.ContractCaller) (*{{.Type}}Caller, error) { + contract, err := bind{{.Type}}(address, caller, nil, nil) + if err != nil { + return nil, err + } + return &{{.Type}}Caller{contract: contract}, nil + } + + // New{{.Type}}Transactor creates a new write-only instance of {{.Type}}, bound to a specific deployed contract. + func New{{.Type}}Transactor(address common.Address, transactor bind.ContractTransactor) (*{{.Type}}Transactor, error) { + contract, err := bind{{.Type}}(address, nil, transactor, nil) + if err != nil { + return nil, err + } + return &{{.Type}}Transactor{contract: contract}, nil + } + + // New{{.Type}}Filterer creates a new log filterer instance of {{.Type}}, bound to a specific deployed contract. + func New{{.Type}}Filterer(address common.Address, filterer bind.ContractFilterer) (*{{.Type}}Filterer, error) { + contract, err := bind{{.Type}}(address, nil, nil, filterer) + if err != nil { + return nil, err + } + return &{{.Type}}Filterer{contract: contract}, nil + } + + // bind{{.Type}} binds a generic wrapper to an already deployed contract. + func bind{{.Type}}(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor, filterer bind.ContractFilterer) (*bind.BoundContract, error) { + parsed, err := abi.JSON(strings.NewReader({{.Type}}ABI)) + if err != nil { + return nil, err + } + return bind.NewBoundContract(address, parsed, caller, transactor, filterer), nil + } + + // Call invokes the (constant) contract method with params as input values and + // sets the output to result. The result type might be a single field for simple + // returns, a slice of interfaces for anonymous returns and a struct for named + // returns. + func (_{{$contract.Type}} *{{$contract.Type}}Raw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error { + return _{{$contract.Type}}.Contract.{{$contract.Type}}Caller.contract.Call(opts, result, method, params...) + } + + // Transfer initiates a plain transaction to move funds to the contract, calling + // its default method if one is available. + func (_{{$contract.Type}} *{{$contract.Type}}Raw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) { + return _{{$contract.Type}}.Contract.{{$contract.Type}}Transactor.contract.Transfer(opts) + } + + // Transact invokes the (paid) contract method with params as input values. + func (_{{$contract.Type}} *{{$contract.Type}}Raw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) { + return _{{$contract.Type}}.Contract.{{$contract.Type}}Transactor.contract.Transact(opts, method, params...) + } + + // Call invokes the (constant) contract method with params as input values and + // sets the output to result. The result type might be a single field for simple + // returns, a slice of interfaces for anonymous returns and a struct for named + // returns. + func (_{{$contract.Type}} *{{$contract.Type}}CallerRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error { + return _{{$contract.Type}}.Contract.contract.Call(opts, result, method, params...) + } + + // Transfer initiates a plain transaction to move funds to the contract, calling + // its default method if one is available. + func (_{{$contract.Type}} *{{$contract.Type}}TransactorRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) { + return _{{$contract.Type}}.Contract.contract.Transfer(opts) + } + + // Transact invokes the (paid) contract method with params as input values. + func (_{{$contract.Type}} *{{$contract.Type}}TransactorRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) { + return _{{$contract.Type}}.Contract.contract.Transact(opts, method, params...) + } + + {{range .Structs}} + // {{.Name}} is an auto generated low-level Go binding around an user-defined struct. + type {{.Name}} struct { + {{range $field := .Fields}} + {{$field.Name}} {{$field.Type}}{{end}} + } + {{end}} + + {{range .Calls}} + // {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{formatmethod .Original $structs}} + func (_{{$contract.Type}} *{{$contract.Type}}Caller) {{.Normalized.Name}}(opts *bind.CallOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} },{{else}}{{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}}{{end}} error) { + {{if .Structured}}ret := new(struct{ + {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}} + {{end}} + }){{else}}var ( + {{range $i, $_ := .Normalized.Outputs}}ret{{$i}} = new({{bindtype .Type $structs}}) + {{end}} + ){{end}} + out := {{if .Structured}}ret{{else}}{{if eq (len .Normalized.Outputs) 1}}ret0{{else}}&[]interface{}{ + {{range $i, $_ := .Normalized.Outputs}}ret{{$i}}, + {{end}} + }{{end}}{{end}} + err := _{{$contract.Type}}.contract.Call(opts, out, "{{.Original.Name}}" {{range .Normalized.Inputs}}, {{.Name}}{{end}}) + return {{if .Structured}}*ret,{{else}}{{range $i, $_ := .Normalized.Outputs}}*ret{{$i}},{{end}}{{end}} err + } + + // {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{formatmethod .Original $structs}} + func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}} {{end}} error) { + return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}}) + } + + // {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{formatmethod .Original $structs}} + func (_{{$contract.Type}} *{{$contract.Type}}CallerSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}} {{end}} error) { + return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}}) + } + {{end}} + + {{range .Transacts}} + // {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{formatmethod .Original $structs}} + func (_{{$contract.Type}} *{{$contract.Type}}Transactor) {{.Normalized.Name}}(opts *bind.TransactOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type $structs}} {{end}}) (*types.Transaction, error) { + return _{{$contract.Type}}.contract.Transact(opts, "{{.Original.Name}}" {{range .Normalized.Inputs}}, {{.Name}}{{end}}) + } + + // {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{formatmethod .Original $structs}} + func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) (*types.Transaction, error) { + return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.TransactOpts {{range $i, $_ := .Normalized.Inputs}}, {{.Name}}{{end}}) + } + + // {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{formatmethod .Original $structs}} + func (_{{$contract.Type}} *{{$contract.Type}}TransactorSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) (*types.Transaction, error) { + return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.TransactOpts {{range $i, $_ := .Normalized.Inputs}}, {{.Name}}{{end}}) + } + {{end}} + + {{range .Events}} + // {{$contract.Type}}{{.Normalized.Name}}Iterator is returned from Filter{{.Normalized.Name}} and is used to iterate over the raw logs and unpacked data for {{.Normalized.Name}} events raised by the {{$contract.Type}} contract. + type {{$contract.Type}}{{.Normalized.Name}}Iterator struct { + Event *{{$contract.Type}}{{.Normalized.Name}} // Event containing the contract specifics and raw log + + contract *bind.BoundContract // Generic contract to use for unpacking event data + event string // Event name to use for unpacking event data + + logs chan types.Log // Log channel receiving the found contract events + sub ethereum.Subscription // Subscription for errors, completion and termination + done bool // Whether the subscription completed delivering logs + fail error // Occurred error to stop iteration + } + // Next advances the iterator to the subsequent event, returning whether there + // are any more events found. In case of a retrieval or parsing error, false is + // returned and Error() can be queried for the exact failure. + func (it *{{$contract.Type}}{{.Normalized.Name}}Iterator) Next() bool { + // If the iterator failed, stop iterating + if (it.fail != nil) { + return false + } + // If the iterator completed, deliver directly whatever's available + if (it.done) { + select { + case log := <-it.logs: + it.Event = new({{$contract.Type}}{{.Normalized.Name}}) + if err := it.contract.UnpackLog(it.Event, it.event, log); err != nil { + it.fail = err + return false + } + it.Event.Raw = log + return true + + default: + return false + } + } + // Iterator still in progress, wait for either a data or an error event + select { + case log := <-it.logs: + it.Event = new({{$contract.Type}}{{.Normalized.Name}}) + if err := it.contract.UnpackLog(it.Event, it.event, log); err != nil { + it.fail = err + return false + } + it.Event.Raw = log + return true + + case err := <-it.sub.Err(): + it.done = true + it.fail = err + return it.Next() + } + } + // Error returns any retrieval or parsing error occurred during filtering. + func (it *{{$contract.Type}}{{.Normalized.Name}}Iterator) Error() error { + return it.fail + } + // Close terminates the iteration process, releasing any pending underlying + // resources. + func (it *{{$contract.Type}}{{.Normalized.Name}}Iterator) Close() error { + it.sub.Unsubscribe() + return nil + } + + // {{$contract.Type}}{{.Normalized.Name}} represents a {{.Normalized.Name}} event raised by the {{$contract.Type}} contract. + type {{$contract.Type}}{{.Normalized.Name}} struct { {{range .Normalized.Inputs}} + {{capitalise .Name}} {{if .Indexed}}{{bindtopictype .Type $structs}}{{else}}{{bindtype .Type $structs}}{{end}}; {{end}} + Raw types.Log // Blockchain specific contextual infos + } + + // Filter{{.Normalized.Name}} is a free log retrieval operation binding the contract event 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{formatevent .Original $structs}} + func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Filter{{.Normalized.Name}}(opts *bind.FilterOpts{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}} []{{bindtype .Type $structs}}{{end}}{{end}}) (*{{$contract.Type}}{{.Normalized.Name}}Iterator, error) { + {{range .Normalized.Inputs}} + {{if .Indexed}}var {{.Name}}Rule []interface{} + for _, {{.Name}}Item := range {{.Name}} { + {{.Name}}Rule = append({{.Name}}Rule, {{.Name}}Item) + }{{end}}{{end}} + + logs, sub, err := _{{$contract.Type}}.contract.FilterLogs(opts, "{{.Original.Name}}"{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}}Rule{{end}}{{end}}) + if err != nil { + return nil, err + } + return &{{$contract.Type}}{{.Normalized.Name}}Iterator{contract: _{{$contract.Type}}.contract, event: "{{.Original.Name}}", logs: logs, sub: sub}, nil + } + + // Watch{{.Normalized.Name}} is a free log subscription operation binding the contract event 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{formatevent .Original $structs}} + func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Watch{{.Normalized.Name}}(opts *bind.WatchOpts, sink chan<- *{{$contract.Type}}{{.Normalized.Name}}{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}} []{{bindtype .Type $structs}}{{end}}{{end}}) (event.Subscription, error) { + {{range .Normalized.Inputs}} + {{if .Indexed}}var {{.Name}}Rule []interface{} + for _, {{.Name}}Item := range {{.Name}} { + {{.Name}}Rule = append({{.Name}}Rule, {{.Name}}Item) + }{{end}}{{end}} + + logs, sub, err := _{{$contract.Type}}.contract.WatchLogs(opts, "{{.Original.Name}}"{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}}Rule{{end}}{{end}}) + if err != nil { + return nil, err + } + return event.NewSubscription(func(quit <-chan struct{}) error { + defer sub.Unsubscribe() + for { + select { + case log := <-logs: + // New log arrived, parse the event and forward to the user + event := new({{$contract.Type}}{{.Normalized.Name}}) + if err := _{{$contract.Type}}.contract.UnpackLog(event, "{{.Original.Name}}", log); err != nil { + return err + } + event.Raw = log + + select { + case sink <- event: + case err := <-sub.Err(): + return err + case <-quit: + return nil + } + case err := <-sub.Err(): + return err + case <-quit: + return nil + } + } + }), nil + } + + // Parse{{.Normalized.Name}} is a log parse operation binding the contract event 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{.Original.String}} + func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Parse{{.Normalized.Name}}(log types.Log) (*{{$contract.Type}}{{.Normalized.Name}}, error) { + event := new({{$contract.Type}}{{.Normalized.Name}}) + if err := _{{$contract.Type}}.contract.UnpackLog(event, "{{.Original.Name}}", log); err != nil { + return nil, err + } + return event, nil + } + + {{end}} +{{end}} +` + +// tmplSourceJava is the Java source template use to generate the contract binding +// based on. +const tmplSourceJava = ` +// This file is an automatically generated Java binding. Do not modify as any +// change will likely be lost upon the next re-generation! + +package {{.Package}}; + +import org.ethereum.geth.*; +import java.util.*; + +{{range $contract := .Contracts}} +{{$structs := $contract.Structs}} +{{if not .Library}}public {{end}}class {{.Type}} { + // ABI is the input ABI used to generate the binding from. + public final static String ABI = "{{.InputABI}}"; + {{if $contract.FuncSigs}} + // {{.Type}}FuncSigs maps the 4-byte function signature to its string representation. + public final static Map<String, String> {{.Type}}FuncSigs; + static { + Hashtable<String, String> temp = new Hashtable<String, String>(); + {{range $strsig, $binsig := .FuncSigs}}temp.put("{{$binsig}}", "{{$strsig}}"); + {{end}} + {{.Type}}FuncSigs = Collections.unmodifiableMap(temp); + } + {{end}} + {{if .InputBin}} + // BYTECODE is the compiled bytecode used for deploying new contracts. + public final static String BYTECODE = "0x{{.InputBin}}"; + + // deploy deploys a new Ethereum contract, binding an instance of {{.Type}} to it. + public static {{.Type}} deploy(TransactOpts auth, EthereumClient client{{range .Constructor.Inputs}}, {{bindtype .Type $structs}} {{.Name}}{{end}}) throws Exception { + Interfaces args = Geth.newInterfaces({{(len .Constructor.Inputs)}}); + String bytecode = BYTECODE; + {{if .Libraries}} + + // "link" contract to dependent libraries by deploying them first. + {{range $pattern, $name := .Libraries}} + {{capitalise $name}} {{decapitalise $name}}Inst = {{capitalise $name}}.deploy(auth, client); + bytecode = bytecode.replace("__${{$pattern}}$__", {{decapitalise $name}}Inst.Address.getHex().substring(2)); + {{end}} + {{end}} + {{range $index, $element := .Constructor.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type $structs) .Type}}({{.Name}});args.set({{$index}},arg{{$index}}); + {{end}} + return new {{.Type}}(Geth.deployContract(auth, ABI, Geth.decodeFromHex(bytecode), client, args)); + } + + // Internal constructor used by contract deployment. + private {{.Type}}(BoundContract deployment) { + this.Address = deployment.getAddress(); + this.Deployer = deployment.getDeployer(); + this.Contract = deployment; + } + {{end}} + + // Ethereum address where this contract is located at. + public final Address Address; + + // Ethereum transaction in which this contract was deployed (if known!). + public final Transaction Deployer; + + // Contract instance bound to a blockchain address. + private final BoundContract Contract; + + // Creates a new instance of {{.Type}}, bound to a specific deployed contract. + public {{.Type}}(Address address, EthereumClient client) throws Exception { + this(Geth.bindContract(address, ABI, client)); + } + + {{range .Calls}} + {{if gt (len .Normalized.Outputs) 1}} + // {{capitalise .Normalized.Name}}Results is the output of a call to {{.Normalized.Name}}. + public class {{capitalise .Normalized.Name}}Results { + {{range $index, $item := .Normalized.Outputs}}public {{bindtype .Type $structs}} {{if ne .Name ""}}{{.Name}}{{else}}Return{{$index}}{{end}}; + {{end}} + } + {{end}} + + // {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{.Original.String}} + public {{if gt (len .Normalized.Outputs) 1}}{{capitalise .Normalized.Name}}Results{{else}}{{range .Normalized.Outputs}}{{bindtype .Type $structs}}{{end}}{{end}} {{.Normalized.Name}}(CallOpts opts{{range .Normalized.Inputs}}, {{bindtype .Type $structs}} {{.Name}}{{end}}) throws Exception { + Interfaces args = Geth.newInterfaces({{(len .Normalized.Inputs)}}); + {{range $index, $item := .Normalized.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type $structs) .Type}}({{.Name}});args.set({{$index}},arg{{$index}}); + {{end}} + + Interfaces results = Geth.newInterfaces({{(len .Normalized.Outputs)}}); + {{range $index, $item := .Normalized.Outputs}}Interface result{{$index}} = Geth.newInterface(); result{{$index}}.setDefault{{namedtype (bindtype .Type $structs) .Type}}(); results.set({{$index}}, result{{$index}}); + {{end}} + + if (opts == null) { + opts = Geth.newCallOpts(); + } + this.Contract.call(opts, results, "{{.Original.Name}}", args); + {{if gt (len .Normalized.Outputs) 1}} + {{capitalise .Normalized.Name}}Results result = new {{capitalise .Normalized.Name}}Results(); + {{range $index, $item := .Normalized.Outputs}}result.{{if ne .Name ""}}{{.Name}}{{else}}Return{{$index}}{{end}} = results.get({{$index}}).get{{namedtype (bindtype .Type $structs) .Type}}(); + {{end}} + return result; + {{else}}{{range .Normalized.Outputs}}return results.get(0).get{{namedtype (bindtype .Type $structs) .Type}}();{{end}} + {{end}} + } + {{end}} + + {{range .Transacts}} + // {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.ID}}. + // + // Solidity: {{.Original.String}} + public Transaction {{.Normalized.Name}}(TransactOpts opts{{range .Normalized.Inputs}}, {{bindtype .Type $structs}} {{.Name}}{{end}}) throws Exception { + Interfaces args = Geth.newInterfaces({{(len .Normalized.Inputs)}}); + {{range $index, $item := .Normalized.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type $structs) .Type}}({{.Name}});args.set({{$index}},arg{{$index}}); + {{end}} + return this.Contract.transact(opts, "{{.Original.Name}}" , args); + } + {{end}} +} +{{end}} +` diff --git a/accounts/abi/bind/topics.go b/accounts/abi/bind/topics.go new file mode 100644 index 0000000..58e4ff3 --- /dev/null +++ b/accounts/abi/bind/topics.go @@ -0,0 +1,241 @@ +// Copyright 2018 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package bind + +import ( + "encoding/binary" + "errors" + "fmt" + "math/big" + "reflect" + + "github.com/ava-labs/coreth/accounts/abi" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/crypto" +) + +// makeTopics converts a filter query argument list into a filter topic set. +func makeTopics(query ...[]interface{}) ([][]common.Hash, error) { + topics := make([][]common.Hash, len(query)) + for i, filter := range query { + for _, rule := range filter { + var topic common.Hash + + // Try to generate the topic based on simple types + switch rule := rule.(type) { + case common.Hash: + copy(topic[:], rule[:]) + case common.Address: + copy(topic[common.HashLength-common.AddressLength:], rule[:]) + case *big.Int: + blob := rule.Bytes() + copy(topic[common.HashLength-len(blob):], blob) + case bool: + if rule { + topic[common.HashLength-1] = 1 + } + case int8: + blob := big.NewInt(int64(rule)).Bytes() + copy(topic[common.HashLength-len(blob):], blob) + case int16: + blob := big.NewInt(int64(rule)).Bytes() + copy(topic[common.HashLength-len(blob):], blob) + case int32: + blob := big.NewInt(int64(rule)).Bytes() + copy(topic[common.HashLength-len(blob):], blob) + case int64: + blob := big.NewInt(rule).Bytes() + copy(topic[common.HashLength-len(blob):], blob) + case uint8: + blob := new(big.Int).SetUint64(uint64(rule)).Bytes() + copy(topic[common.HashLength-len(blob):], blob) + case uint16: + blob := new(big.Int).SetUint64(uint64(rule)).Bytes() + copy(topic[common.HashLength-len(blob):], blob) + case uint32: + blob := new(big.Int).SetUint64(uint64(rule)).Bytes() + copy(topic[common.HashLength-len(blob):], blob) + case uint64: + blob := new(big.Int).SetUint64(rule).Bytes() + copy(topic[common.HashLength-len(blob):], blob) + case string: + hash := crypto.Keccak256Hash([]byte(rule)) + copy(topic[:], hash[:]) + case []byte: + hash := crypto.Keccak256Hash(rule) + copy(topic[:], hash[:]) + + default: + // Attempt to generate the topic from funky types + val := reflect.ValueOf(rule) + + switch { + + // static byte array + case val.Kind() == reflect.Array && reflect.TypeOf(rule).Elem().Kind() == reflect.Uint8: + reflect.Copy(reflect.ValueOf(topic[:val.Len()]), val) + + default: + return nil, fmt.Errorf("unsupported indexed type: %T", rule) + } + } + topics[i] = append(topics[i], topic) + } + } + return topics, nil +} + +// Big batch of reflect types for topic reconstruction. +var ( + reflectHash = reflect.TypeOf(common.Hash{}) + reflectAddress = reflect.TypeOf(common.Address{}) + reflectBigInt = reflect.TypeOf(new(big.Int)) +) + +// parseTopics converts the indexed topic fields into actual log field values. +// +// Note, dynamic types cannot be reconstructed since they get mapped to Keccak256 +// hashes as the topic value! +func parseTopics(out interface{}, fields abi.Arguments, topics []common.Hash) error { + // Sanity check that the fields and topics match up + if len(fields) != len(topics) { + return errors.New("topic/field count mismatch") + } + // Iterate over all the fields and reconstruct them from topics + for _, arg := range fields { + if !arg.Indexed { + return errors.New("non-indexed field in topic reconstruction") + } + field := reflect.ValueOf(out).Elem().FieldByName(capitalise(arg.Name)) + + // Try to parse the topic back into the fields based on primitive types + switch field.Kind() { + case reflect.Bool: + if topics[0][common.HashLength-1] == 1 { + field.Set(reflect.ValueOf(true)) + } + case reflect.Int8: + num := new(big.Int).SetBytes(topics[0][:]) + field.Set(reflect.ValueOf(int8(num.Int64()))) + + case reflect.Int16: + num := new(big.Int).SetBytes(topics[0][:]) + field.Set(reflect.ValueOf(int16(num.Int64()))) + + case reflect.Int32: + num := new(big.Int).SetBytes(topics[0][:]) + field.Set(reflect.ValueOf(int32(num.Int64()))) + + case reflect.Int64: + num := new(big.Int).SetBytes(topics[0][:]) + field.Set(reflect.ValueOf(num.Int64())) + + case reflect.Uint8: + num := new(big.Int).SetBytes(topics[0][:]) + field.Set(reflect.ValueOf(uint8(num.Uint64()))) + + case reflect.Uint16: + num := new(big.Int).SetBytes(topics[0][:]) + field.Set(reflect.ValueOf(uint16(num.Uint64()))) + + case reflect.Uint32: + num := new(big.Int).SetBytes(topics[0][:]) + field.Set(reflect.ValueOf(uint32(num.Uint64()))) + + case reflect.Uint64: + num := new(big.Int).SetBytes(topics[0][:]) + field.Set(reflect.ValueOf(num.Uint64())) + + default: + // Ran out of plain primitive types, try custom types + switch field.Type() { + case reflectHash: // Also covers all dynamic types + field.Set(reflect.ValueOf(topics[0])) + + case reflectAddress: + var addr common.Address + copy(addr[:], topics[0][common.HashLength-common.AddressLength:]) + field.Set(reflect.ValueOf(addr)) + + case reflectBigInt: + num := new(big.Int).SetBytes(topics[0][:]) + field.Set(reflect.ValueOf(num)) + + default: + // Ran out of custom types, try the crazies + switch { + + // static byte array + case arg.Type.T == abi.FixedBytesTy: + reflect.Copy(field, reflect.ValueOf(topics[0][:arg.Type.Size])) + + default: + return fmt.Errorf("unsupported indexed type: %v", arg.Type) + } + } + } + topics = topics[1:] + } + return nil +} + +// parseTopicsIntoMap converts the indexed topic field-value pairs into map key-value pairs +func parseTopicsIntoMap(out map[string]interface{}, fields abi.Arguments, topics []common.Hash) error { + // Sanity check that the fields and topics match up + if len(fields) != len(topics) { + return errors.New("topic/field count mismatch") + } + // Iterate over all the fields and reconstruct them from topics + for _, arg := range fields { + if !arg.Indexed { + return errors.New("non-indexed field in topic reconstruction") + } + + switch arg.Type.T { + case abi.BoolTy: + out[arg.Name] = topics[0][common.HashLength-1] == 1 + case abi.IntTy, abi.UintTy: + num := new(big.Int).SetBytes(topics[0][:]) + out[arg.Name] = num + case abi.AddressTy: + var addr common.Address + copy(addr[:], topics[0][common.HashLength-common.AddressLength:]) + out[arg.Name] = addr + case abi.HashTy: + out[arg.Name] = topics[0] + case abi.FixedBytesTy: + out[arg.Name] = topics[0][:] + case abi.StringTy, abi.BytesTy, abi.SliceTy, abi.ArrayTy: + // Array types (including strings and bytes) have their keccak256 hashes stored in the topic- not a hash + // whose bytes can be decoded to the actual value- so the best we can do is retrieve that hash + out[arg.Name] = topics[0] + case abi.FunctionTy: + if garbage := binary.BigEndian.Uint64(topics[0][0:8]); garbage != 0 { + return fmt.Errorf("bind: got improperly encoded function type, got %v", topics[0].Bytes()) + } + var tmp [24]byte + copy(tmp[:], topics[0][8:32]) + out[arg.Name] = tmp + default: // Not handling tuples + return fmt.Errorf("unsupported indexed type: %v", arg.Type) + } + + topics = topics[1:] + } + + return nil +} diff --git a/accounts/abi/bind/util.go b/accounts/abi/bind/util.go new file mode 100644 index 0000000..b3ec22c --- /dev/null +++ b/accounts/abi/bind/util.go @@ -0,0 +1,76 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package bind + +import ( + "context" + "fmt" + "time" + + "github.com/ava-labs/coreth/core/types" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/log" +) + +// WaitMined waits for tx to be mined on the blockchain. +// It stops waiting when the context is canceled. +func WaitMined(ctx context.Context, b DeployBackend, tx *types.Transaction) (*types.Receipt, error) { + queryTicker := time.NewTicker(time.Second) + defer queryTicker.Stop() + + logger := log.New("hash", tx.Hash()) + for { + receipt, err := b.TransactionReceipt(ctx, tx.Hash()) + if receipt != nil { + return receipt, nil + } + if err != nil { + logger.Trace("Receipt retrieval failed", "err", err) + } else { + logger.Trace("Transaction not yet mined") + } + // Wait for the next round. + select { + case <-ctx.Done(): + return nil, ctx.Err() + case <-queryTicker.C: + } + } +} + +// WaitDeployed waits for a contract deployment transaction and returns the on-chain +// contract address when it is mined. It stops waiting when ctx is canceled. +func WaitDeployed(ctx context.Context, b DeployBackend, tx *types.Transaction) (common.Address, error) { + if tx.To() != nil { + return common.Address{}, fmt.Errorf("tx is not contract creation") + } + receipt, err := WaitMined(ctx, b, tx) + if err != nil { + return common.Address{}, err + } + if receipt.ContractAddress == (common.Address{}) { + return common.Address{}, fmt.Errorf("zero address") + } + // Check that code has indeed been deployed at the address. + // This matters on pre-Homestead chains: OOG in the constructor + // could leave an empty account behind. + code, err := b.CodeAt(ctx, receipt.ContractAddress, nil) + if err == nil && len(code) == 0 { + err = ErrNoCodeAfterDeploy + } + return receipt.ContractAddress, err +} diff --git a/accounts/abi/doc.go b/accounts/abi/doc.go new file mode 100644 index 0000000..8242068 --- /dev/null +++ b/accounts/abi/doc.go @@ -0,0 +1,26 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +// Package abi implements the Ethereum ABI (Application Binary +// Interface). +// +// The Ethereum ABI is strongly typed, known at compile time +// and static. This ABI will handle basic type casting; unsigned +// to signed and visa versa. It does not handle slice casting such +// as unsigned slice to signed slice. Bit size type casting is also +// handled. ints with a bit size of 32 will be properly cast to int256, +// etc. +package abi diff --git a/accounts/abi/error.go b/accounts/abi/error.go new file mode 100644 index 0000000..9d8674a --- /dev/null +++ b/accounts/abi/error.go @@ -0,0 +1,84 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "errors" + "fmt" + "reflect" +) + +var ( + errBadBool = errors.New("abi: improperly encoded boolean value") +) + +// formatSliceString formats the reflection kind with the given slice size +// and returns a formatted string representation. +func formatSliceString(kind reflect.Kind, sliceSize int) string { + if sliceSize == -1 { + return fmt.Sprintf("[]%v", kind) + } + return fmt.Sprintf("[%d]%v", sliceSize, kind) +} + +// sliceTypeCheck checks that the given slice can by assigned to the reflection +// type in t. +func sliceTypeCheck(t Type, val reflect.Value) error { + if val.Kind() != reflect.Slice && val.Kind() != reflect.Array { + return typeErr(formatSliceString(t.Kind, t.Size), val.Type()) + } + + if t.T == ArrayTy && val.Len() != t.Size { + return typeErr(formatSliceString(t.Elem.Kind, t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len())) + } + + if t.Elem.T == SliceTy { + if val.Len() > 0 { + return sliceTypeCheck(*t.Elem, val.Index(0)) + } + } else if t.Elem.T == ArrayTy { + return sliceTypeCheck(*t.Elem, val.Index(0)) + } + + if elemKind := val.Type().Elem().Kind(); elemKind != t.Elem.Kind { + return typeErr(formatSliceString(t.Elem.Kind, t.Size), val.Type()) + } + return nil +} + +// typeCheck checks that the given reflection value can be assigned to the reflection +// type in t. +func typeCheck(t Type, value reflect.Value) error { + if t.T == SliceTy || t.T == ArrayTy { + return sliceTypeCheck(t, value) + } + + // Check base type validity. Element types will be checked later on. + if t.Kind != value.Kind() { + return typeErr(t.Kind, value.Kind()) + } else if t.T == FixedBytesTy && t.Size != value.Len() { + return typeErr(t.Type, value.Type()) + } else { + return nil + } + +} + +// typeErr returns a formatted type casting error. +func typeErr(expected, got interface{}) error { + return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected) +} diff --git a/accounts/abi/event.go b/accounts/abi/event.go new file mode 100644 index 0000000..7a41baa --- /dev/null +++ b/accounts/abi/event.go @@ -0,0 +1,77 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "fmt" + "strings" + + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/crypto" +) + +// Event is an event potentially triggered by the EVM's LOG mechanism. The Event +// holds type information (inputs) about the yielded output. Anonymous events +// don't get the signature canonical representation as the first LOG topic. +type Event struct { + // Name is the event name used for internal representation. It's derived from + // the raw name and a suffix will be added in the case of a event overload. + // + // e.g. + // There are two events have same name: + // * foo(int,int) + // * foo(uint,uint) + // The event name of the first one wll be resolved as foo while the second one + // will be resolved as foo0. + Name string + // RawName is the raw event name parsed from ABI. + RawName string + Anonymous bool + Inputs Arguments +} + +func (e Event) String() string { + inputs := make([]string, len(e.Inputs)) + for i, input := range e.Inputs { + inputs[i] = fmt.Sprintf("%v %v", input.Type, input.Name) + if input.Indexed { + inputs[i] = fmt.Sprintf("%v indexed %v", input.Type, input.Name) + } + } + return fmt.Sprintf("event %v(%v)", e.RawName, strings.Join(inputs, ", ")) +} + +// Sig returns the event string signature according to the ABI spec. +// +// Example +// +// event foo(uint32 a, int b) = "foo(uint32,int256)" +// +// Please note that "int" is substitute for its canonical representation "int256" +func (e Event) Sig() string { + types := make([]string, len(e.Inputs)) + for i, input := range e.Inputs { + types[i] = input.Type.String() + } + return fmt.Sprintf("%v(%v)", e.RawName, strings.Join(types, ",")) +} + +// ID returns the canonical representation of the event's signature used by the +// abi definition to identify event names and types. +func (e Event) ID() common.Hash { + return common.BytesToHash(crypto.Keccak256([]byte(e.Sig()))) +} diff --git a/accounts/abi/method.go b/accounts/abi/method.go new file mode 100644 index 0000000..9cceaba --- /dev/null +++ b/accounts/abi/method.go @@ -0,0 +1,90 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "fmt" + "strings" + + "github.com/ava-labs/go-ethereum/crypto" +) + +// Method represents a callable given a `Name` and whether the method is a constant. +// If the method is `Const` no transaction needs to be created for this +// particular Method call. It can easily be simulated using a local VM. +// For example a `Balance()` method only needs to retrieve something +// from the storage and therefore requires no Tx to be send to the +// network. A method such as `Transact` does require a Tx and thus will +// be flagged `false`. +// Input specifies the required input parameters for this gives method. +type Method struct { + // Name is the method name used for internal representation. It's derived from + // the raw name and a suffix will be added in the case of a function overload. + // + // e.g. + // There are two functions have same name: + // * foo(int,int) + // * foo(uint,uint) + // The method name of the first one will be resolved as foo while the second one + // will be resolved as foo0. + Name string + // RawName is the raw method name parsed from ABI. + RawName string + Const bool + Inputs Arguments + Outputs Arguments +} + +// Sig returns the methods string signature according to the ABI spec. +// +// Example +// +// function foo(uint32 a, int b) = "foo(uint32,int256)" +// +// Please note that "int" is substitute for its canonical representation "int256" +func (method Method) Sig() string { + types := make([]string, len(method.Inputs)) + for i, input := range method.Inputs { + types[i] = input.Type.String() + } + return fmt.Sprintf("%v(%v)", method.RawName, strings.Join(types, ",")) +} + +func (method Method) String() string { + inputs := make([]string, len(method.Inputs)) + for i, input := range method.Inputs { + inputs[i] = fmt.Sprintf("%v %v", input.Type, input.Name) + } + outputs := make([]string, len(method.Outputs)) + for i, output := range method.Outputs { + outputs[i] = output.Type.String() + if len(output.Name) > 0 { + outputs[i] += fmt.Sprintf(" %v", output.Name) + } + } + constant := "" + if method.Const { + constant = "constant " + } + return fmt.Sprintf("function %v(%v) %sreturns(%v)", method.RawName, strings.Join(inputs, ", "), constant, strings.Join(outputs, ", ")) +} + +// ID returns the canonical representation of the method's signature used by the +// abi definition to identify method names and types. +func (method Method) ID() []byte { + return crypto.Keccak256([]byte(method.Sig()))[:4] +} diff --git a/accounts/abi/numbers.go b/accounts/abi/numbers.go new file mode 100644 index 0000000..c2e844c --- /dev/null +++ b/accounts/abi/numbers.go @@ -0,0 +1,44 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "math/big" + "reflect" + + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/common/math" +) + +var ( + bigT = reflect.TypeOf(&big.Int{}) + derefbigT = reflect.TypeOf(big.Int{}) + uint8T = reflect.TypeOf(uint8(0)) + uint16T = reflect.TypeOf(uint16(0)) + uint32T = reflect.TypeOf(uint32(0)) + uint64T = reflect.TypeOf(uint64(0)) + int8T = reflect.TypeOf(int8(0)) + int16T = reflect.TypeOf(int16(0)) + int32T = reflect.TypeOf(int32(0)) + int64T = reflect.TypeOf(int64(0)) + addressT = reflect.TypeOf(common.Address{}) +) + +// U256 converts a big Int into a 256bit EVM number. +func U256(n *big.Int) []byte { + return math.PaddedBigBytes(math.U256(n), 32) +} diff --git a/accounts/abi/pack.go b/accounts/abi/pack.go new file mode 100644 index 0000000..d88dde8 --- /dev/null +++ b/accounts/abi/pack.go @@ -0,0 +1,81 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "math/big" + "reflect" + + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/common/math" +) + +// packBytesSlice packs the given bytes as [L, V] as the canonical representation +// bytes slice +func packBytesSlice(bytes []byte, l int) []byte { + len := packNum(reflect.ValueOf(l)) + return append(len, common.RightPadBytes(bytes, (l+31)/32*32)...) +} + +// packElement packs the given reflect value according to the abi specification in +// t. +func packElement(t Type, reflectValue reflect.Value) []byte { + switch t.T { + case IntTy, UintTy: + return packNum(reflectValue) + case StringTy: + return packBytesSlice([]byte(reflectValue.String()), reflectValue.Len()) + case AddressTy: + if reflectValue.Kind() == reflect.Array { + reflectValue = mustArrayToByteSlice(reflectValue) + } + + return common.LeftPadBytes(reflectValue.Bytes(), 32) + case BoolTy: + if reflectValue.Bool() { + return math.PaddedBigBytes(common.Big1, 32) + } + return math.PaddedBigBytes(common.Big0, 32) + case BytesTy: + if reflectValue.Kind() == reflect.Array { + reflectValue = mustArrayToByteSlice(reflectValue) + } + return packBytesSlice(reflectValue.Bytes(), reflectValue.Len()) + case FixedBytesTy, FunctionTy: + if reflectValue.Kind() == reflect.Array { + reflectValue = mustArrayToByteSlice(reflectValue) + } + return common.RightPadBytes(reflectValue.Bytes(), 32) + default: + panic("abi: fatal error") + } +} + +// packNum packs the given number (using the reflect value) and will cast it to appropriate number representation +func packNum(value reflect.Value) []byte { + switch kind := value.Kind(); kind { + case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64: + return U256(new(big.Int).SetUint64(value.Uint())) + case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: + return U256(big.NewInt(value.Int())) + case reflect.Ptr: + return U256(value.Interface().(*big.Int)) + default: + panic("abi: fatal error") + } + +} diff --git a/accounts/abi/reflect.go b/accounts/abi/reflect.go new file mode 100644 index 0000000..73ca8fa --- /dev/null +++ b/accounts/abi/reflect.go @@ -0,0 +1,226 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "fmt" + "reflect" + "strings" +) + +// indirect recursively dereferences the value until it either gets the value +// or finds a big.Int +func indirect(v reflect.Value) reflect.Value { + if v.Kind() == reflect.Ptr && v.Elem().Type() != derefbigT { + return indirect(v.Elem()) + } + return v +} + +// indirectInterfaceOrPtr recursively dereferences the value until value is not interface. +func indirectInterfaceOrPtr(v reflect.Value) reflect.Value { + if (v.Kind() == reflect.Interface || v.Kind() == reflect.Ptr) && v.Elem().IsValid() { + return indirect(v.Elem()) + } + return v +} + +// reflectIntKind returns the reflect using the given size and +// unsignedness. +func reflectIntKindAndType(unsigned bool, size int) (reflect.Kind, reflect.Type) { + switch size { + case 8: + if unsigned { + return reflect.Uint8, uint8T + } + return reflect.Int8, int8T + case 16: + if unsigned { + return reflect.Uint16, uint16T + } + return reflect.Int16, int16T + case 32: + if unsigned { + return reflect.Uint32, uint32T + } + return reflect.Int32, int32T + case 64: + if unsigned { + return reflect.Uint64, uint64T + } + return reflect.Int64, int64T + } + return reflect.Ptr, bigT +} + +// mustArrayToBytesSlice creates a new byte slice with the exact same size as value +// and copies the bytes in value to the new slice. +func mustArrayToByteSlice(value reflect.Value) reflect.Value { + slice := reflect.MakeSlice(reflect.TypeOf([]byte{}), value.Len(), value.Len()) + reflect.Copy(slice, value) + return slice +} + +// set attempts to assign src to dst by either setting, copying or otherwise. +// +// set is a bit more lenient when it comes to assignment and doesn't force an as +// strict ruleset as bare `reflect` does. +func set(dst, src reflect.Value) error { + dstType, srcType := dst.Type(), src.Type() + switch { + case dstType.Kind() == reflect.Interface && dst.Elem().IsValid(): + return set(dst.Elem(), src) + case dstType.Kind() == reflect.Ptr && dstType.Elem() != derefbigT: + return set(dst.Elem(), src) + case srcType.AssignableTo(dstType) && dst.CanSet(): + dst.Set(src) + case dstType.Kind() == reflect.Slice && srcType.Kind() == reflect.Slice: + return setSlice(dst, src) + default: + return fmt.Errorf("abi: cannot unmarshal %v in to %v", src.Type(), dst.Type()) + } + return nil +} + +// setSlice attempts to assign src to dst when slices are not assignable by default +// e.g. src: [][]byte -> dst: [][15]byte +func setSlice(dst, src reflect.Value) error { + slice := reflect.MakeSlice(dst.Type(), src.Len(), src.Len()) + for i := 0; i < src.Len(); i++ { + v := src.Index(i) + reflect.Copy(slice.Index(i), v) + } + + dst.Set(slice) + return nil +} + +// requireAssignable assures that `dest` is a pointer and it's not an interface. +func requireAssignable(dst, src reflect.Value) error { + if dst.Kind() != reflect.Ptr && dst.Kind() != reflect.Interface { + return fmt.Errorf("abi: cannot unmarshal %v into %v", src.Type(), dst.Type()) + } + return nil +} + +// requireUnpackKind verifies preconditions for unpacking `args` into `kind` +func requireUnpackKind(v reflect.Value, t reflect.Type, k reflect.Kind, + args Arguments) error { + + switch k { + case reflect.Struct: + case reflect.Slice, reflect.Array: + if minLen := args.LengthNonIndexed(); v.Len() < minLen { + return fmt.Errorf("abi: insufficient number of elements in the list/array for unpack, want %d, got %d", + minLen, v.Len()) + } + default: + return fmt.Errorf("abi: cannot unmarshal tuple into %v", t) + } + return nil +} + +// mapArgNamesToStructFields maps a slice of argument names to struct fields. +// first round: for each Exportable field that contains a `abi:""` tag +// and this field name exists in the given argument name list, pair them together. +// second round: for each argument name that has not been already linked, +// find what variable is expected to be mapped into, if it exists and has not been +// used, pair them. +// Note this function assumes the given value is a struct value. +func mapArgNamesToStructFields(argNames []string, value reflect.Value) (map[string]string, error) { + typ := value.Type() + + abi2struct := make(map[string]string) + struct2abi := make(map[string]string) + + // first round ~~~ + for i := 0; i < typ.NumField(); i++ { + structFieldName := typ.Field(i).Name + + // skip private struct fields. + if structFieldName[:1] != strings.ToUpper(structFieldName[:1]) { + continue + } + // skip fields that have no abi:"" tag. + var ok bool + var tagName string + if tagName, ok = typ.Field(i).Tag.Lookup("abi"); !ok { + continue + } + // check if tag is empty. + if tagName == "" { + return nil, fmt.Errorf("struct: abi tag in '%s' is empty", structFieldName) + } + // check which argument field matches with the abi tag. + found := false + for _, arg := range argNames { + if arg == tagName { + if abi2struct[arg] != "" { + return nil, fmt.Errorf("struct: abi tag in '%s' already mapped", structFieldName) + } + // pair them + abi2struct[arg] = structFieldName + struct2abi[structFieldName] = arg + found = true + } + } + // check if this tag has been mapped. + if !found { + return nil, fmt.Errorf("struct: abi tag '%s' defined but not found in abi", tagName) + } + } + + // second round ~~~ + for _, argName := range argNames { + + structFieldName := ToCamelCase(argName) + + if structFieldName == "" { + return nil, fmt.Errorf("abi: purely underscored output cannot unpack to struct") + } + + // this abi has already been paired, skip it... unless there exists another, yet unassigned + // struct field with the same field name. If so, raise an error: + // abi: [ { "name": "value" } ] + // struct { Value *big.Int , Value1 *big.Int `abi:"value"`} + if abi2struct[argName] != "" { + if abi2struct[argName] != structFieldName && + struct2abi[structFieldName] == "" && + value.FieldByName(structFieldName).IsValid() { + return nil, fmt.Errorf("abi: multiple variables maps to the same abi field '%s'", argName) + } + continue + } + + // return an error if this struct field has already been paired. + if struct2abi[structFieldName] != "" { + return nil, fmt.Errorf("abi: multiple outputs mapping to the same struct field '%s'", structFieldName) + } + + if value.FieldByName(structFieldName).IsValid() { + // pair them + abi2struct[argName] = structFieldName + struct2abi[structFieldName] = argName + } else { + // not paired, but annotate as used, to detect cases like + // abi : [ { "name": "value" }, { "name": "_value" } ] + // struct { Value *big.Int } + struct2abi[structFieldName] = argName + } + } + return abi2struct, nil +} diff --git a/accounts/abi/type.go b/accounts/abi/type.go new file mode 100644 index 0000000..597d314 --- /dev/null +++ b/accounts/abi/type.go @@ -0,0 +1,348 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "errors" + "fmt" + "reflect" + "regexp" + "strconv" + "strings" +) + +// Type enumerator +const ( + IntTy byte = iota + UintTy + BoolTy + StringTy + SliceTy + ArrayTy + TupleTy + AddressTy + FixedBytesTy + BytesTy + HashTy + FixedPointTy + FunctionTy +) + +// Type is the reflection of the supported argument type +type Type struct { + Elem *Type + Kind reflect.Kind + Type reflect.Type + Size int + T byte // Our own type checking + + stringKind string // holds the unparsed string for deriving signatures + + // Tuple relative fields + TupleElems []*Type // Type information of all tuple fields + TupleRawNames []string // Raw field name of all tuple fields +} + +var ( + // typeRegex parses the abi sub types + typeRegex = regexp.MustCompile("([a-zA-Z]+)(([0-9]+)(x([0-9]+))?)?") +) + +// NewType creates a new reflection type of abi type given in t. +func NewType(t string, components []ArgumentMarshaling) (typ Type, err error) { + // check that array brackets are equal if they exist + if strings.Count(t, "[") != strings.Count(t, "]") { + return Type{}, fmt.Errorf("invalid arg type in abi") + } + typ.stringKind = t + + // if there are brackets, get ready to go into slice/array mode and + // recursively create the type + if strings.Count(t, "[") != 0 { + i := strings.LastIndex(t, "[") + // recursively embed the type + embeddedType, err := NewType(t[:i], components) + if err != nil { + return Type{}, err + } + // grab the last cell and create a type from there + sliced := t[i:] + // grab the slice size with regexp + re := regexp.MustCompile("[0-9]+") + intz := re.FindAllString(sliced, -1) + + if len(intz) == 0 { + // is a slice + typ.T = SliceTy + typ.Kind = reflect.Slice + typ.Elem = &embeddedType + typ.Type = reflect.SliceOf(embeddedType.Type) + typ.stringKind = embeddedType.stringKind + sliced + } else if len(intz) == 1 { + // is a array + typ.T = ArrayTy + typ.Kind = reflect.Array + typ.Elem = &embeddedType + typ.Size, err = strconv.Atoi(intz[0]) + if err != nil { + return Type{}, fmt.Errorf("abi: error parsing variable size: %v", err) + } + typ.Type = reflect.ArrayOf(typ.Size, embeddedType.Type) + typ.stringKind = embeddedType.stringKind + sliced + } else { + return Type{}, fmt.Errorf("invalid formatting of array type") + } + return typ, err + } + // parse the type and size of the abi-type. + matches := typeRegex.FindAllStringSubmatch(t, -1) + if len(matches) == 0 { + return Type{}, fmt.Errorf("invalid type '%v'", t) + } + parsedType := matches[0] + + // varSize is the size of the variable + var varSize int + if len(parsedType[3]) > 0 { + var err error + varSize, err = strconv.Atoi(parsedType[2]) + if err != nil { + return Type{}, fmt.Errorf("abi: error parsing variable size: %v", err) + } + } else { + if parsedType[0] == "uint" || parsedType[0] == "int" { + // this should fail because it means that there's something wrong with + // the abi type (the compiler should always format it to the size...always) + return Type{}, fmt.Errorf("unsupported arg type: %s", t) + } + } + // varType is the parsed abi type + switch varType := parsedType[1]; varType { + case "int": + typ.Kind, typ.Type = reflectIntKindAndType(false, varSize) + typ.Size = varSize + typ.T = IntTy + case "uint": + typ.Kind, typ.Type = reflectIntKindAndType(true, varSize) + typ.Size = varSize + typ.T = UintTy + case "bool": + typ.Kind = reflect.Bool + typ.T = BoolTy + typ.Type = reflect.TypeOf(bool(false)) + case "address": + typ.Kind = reflect.Array + typ.Type = addressT + typ.Size = 20 + typ.T = AddressTy + case "string": + typ.Kind = reflect.String + typ.Type = reflect.TypeOf("") + typ.T = StringTy + case "bytes": + if varSize == 0 { + typ.T = BytesTy + typ.Kind = reflect.Slice + typ.Type = reflect.SliceOf(reflect.TypeOf(byte(0))) + } else { + typ.T = FixedBytesTy + typ.Kind = reflect.Array + typ.Size = varSize + typ.Type = reflect.ArrayOf(varSize, reflect.TypeOf(byte(0))) + } + case "tuple": + var ( + fields []reflect.StructField + elems []*Type + names []string + expression string // canonical parameter expression + ) + expression += "(" + for idx, c := range components { + cType, err := NewType(c.Type, c.Components) + if err != nil { + return Type{}, err + } + if ToCamelCase(c.Name) == "" { + return Type{}, errors.New("abi: purely anonymous or underscored field is not supported") + } + fields = append(fields, reflect.StructField{ + Name: ToCamelCase(c.Name), // reflect.StructOf will panic for any exported field. + Type: cType.Type, + Tag: reflect.StructTag("json:\"" + c.Name + "\""), + }) + elems = append(elems, &cType) + names = append(names, c.Name) + expression += cType.stringKind + if idx != len(components)-1 { + expression += "," + } + } + expression += ")" + typ.Kind = reflect.Struct + typ.Type = reflect.StructOf(fields) + typ.TupleElems = elems + typ.TupleRawNames = names + typ.T = TupleTy + typ.stringKind = expression + case "function": + typ.Kind = reflect.Array + typ.T = FunctionTy + typ.Size = 24 + typ.Type = reflect.ArrayOf(24, reflect.TypeOf(byte(0))) + default: + return Type{}, fmt.Errorf("unsupported arg type: %s", t) + } + + return +} + +// String implements Stringer +func (t Type) String() (out string) { + return t.stringKind +} + +func (t Type) pack(v reflect.Value) ([]byte, error) { + // dereference pointer first if it's a pointer + v = indirect(v) + if err := typeCheck(t, v); err != nil { + return nil, err + } + + switch t.T { + case SliceTy, ArrayTy: + var ret []byte + + if t.requiresLengthPrefix() { + // append length + ret = append(ret, packNum(reflect.ValueOf(v.Len()))...) + } + + // calculate offset if any + offset := 0 + offsetReq := isDynamicType(*t.Elem) + if offsetReq { + offset = getTypeSize(*t.Elem) * v.Len() + } + var tail []byte + for i := 0; i < v.Len(); i++ { + val, err := t.Elem.pack(v.Index(i)) + if err != nil { + return nil, err + } + if !offsetReq { + ret = append(ret, val...) + continue + } + ret = append(ret, packNum(reflect.ValueOf(offset))...) + offset += len(val) + tail = append(tail, val...) + } + return append(ret, tail...), nil + case TupleTy: + // (T1,...,Tk) for k >= 0 and any types T1, …, Tk + // enc(X) = head(X(1)) ... head(X(k)) tail(X(1)) ... tail(X(k)) + // where X = (X(1), ..., X(k)) and head and tail are defined for Ti being a static + // type as + // head(X(i)) = enc(X(i)) and tail(X(i)) = "" (the empty string) + // and as + // head(X(i)) = enc(len(head(X(1)) ... head(X(k)) tail(X(1)) ... tail(X(i-1)))) + // tail(X(i)) = enc(X(i)) + // otherwise, i.e. if Ti is a dynamic type. + fieldmap, err := mapArgNamesToStructFields(t.TupleRawNames, v) + if err != nil { + return nil, err + } + // Calculate prefix occupied size. + offset := 0 + for _, elem := range t.TupleElems { + offset += getTypeSize(*elem) + } + var ret, tail []byte + for i, elem := range t.TupleElems { + field := v.FieldByName(fieldmap[t.TupleRawNames[i]]) + if !field.IsValid() { + return nil, fmt.Errorf("field %s for tuple not found in the given struct", t.TupleRawNames[i]) + } + val, err := elem.pack(field) + if err != nil { + return nil, err + } + if isDynamicType(*elem) { + ret = append(ret, packNum(reflect.ValueOf(offset))...) + tail = append(tail, val...) + offset += len(val) + } else { + ret = append(ret, val...) + } + } + return append(ret, tail...), nil + + default: + return packElement(t, v), nil + } +} + +// requireLengthPrefix returns whether the type requires any sort of length +// prefixing. +func (t Type) requiresLengthPrefix() bool { + return t.T == StringTy || t.T == BytesTy || t.T == SliceTy +} + +// isDynamicType returns true if the type is dynamic. +// The following types are called “dynamic”: +// * bytes +// * string +// * T[] for any T +// * T[k] for any dynamic T and any k >= 0 +// * (T1,...,Tk) if Ti is dynamic for some 1 <= i <= k +func isDynamicType(t Type) bool { + if t.T == TupleTy { + for _, elem := range t.TupleElems { + if isDynamicType(*elem) { + return true + } + } + return false + } + return t.T == StringTy || t.T == BytesTy || t.T == SliceTy || (t.T == ArrayTy && isDynamicType(*t.Elem)) +} + +// getTypeSize returns the size that this type needs to occupy. +// We distinguish static and dynamic types. Static types are encoded in-place +// and dynamic types are encoded at a separately allocated location after the +// current block. +// So for a static variable, the size returned represents the size that the +// variable actually occupies. +// For a dynamic variable, the returned size is fixed 32 bytes, which is used +// to store the location reference for actual value storage. +func getTypeSize(t Type) int { + if t.T == ArrayTy && !isDynamicType(*t.Elem) { + // Recursively calculate type size if it is a nested array + if t.Elem.T == ArrayTy { + return t.Size * getTypeSize(*t.Elem) + } + return t.Size * 32 + } else if t.T == TupleTy && !isDynamicType(t) { + total := 0 + for _, elem := range t.TupleElems { + total += getTypeSize(*elem) + } + return total + } + return 32 +} diff --git a/accounts/abi/unpack.go b/accounts/abi/unpack.go new file mode 100644 index 0000000..d3cd310 --- /dev/null +++ b/accounts/abi/unpack.go @@ -0,0 +1,295 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package abi + +import ( + "encoding/binary" + "fmt" + "math/big" + "reflect" + + "github.com/ava-labs/go-ethereum/common" +) + +var ( + maxUint256 = big.NewInt(0).Add( + big.NewInt(0).Exp(big.NewInt(2), big.NewInt(256), nil), + big.NewInt(-1)) + maxInt256 = big.NewInt(0).Add( + big.NewInt(0).Exp(big.NewInt(2), big.NewInt(255), nil), + big.NewInt(-1)) +) + +// reads the integer based on its kind +func readInteger(typ byte, kind reflect.Kind, b []byte) interface{} { + switch kind { + case reflect.Uint8: + return b[len(b)-1] + case reflect.Uint16: + return binary.BigEndian.Uint16(b[len(b)-2:]) + case reflect.Uint32: + return binary.BigEndian.Uint32(b[len(b)-4:]) + case reflect.Uint64: + return binary.BigEndian.Uint64(b[len(b)-8:]) + case reflect.Int8: + return int8(b[len(b)-1]) + case reflect.Int16: + return int16(binary.BigEndian.Uint16(b[len(b)-2:])) + case reflect.Int32: + return int32(binary.BigEndian.Uint32(b[len(b)-4:])) + case reflect.Int64: + return int64(binary.BigEndian.Uint64(b[len(b)-8:])) + default: + // the only case lefts for integer is int256/uint256. + // big.SetBytes can't tell if a number is negative, positive on itself. + // On EVM, if the returned number > max int256, it is negative. + ret := new(big.Int).SetBytes(b) + if typ == UintTy { + return ret + } + + if ret.Cmp(maxInt256) > 0 { + ret.Add(maxUint256, big.NewInt(0).Neg(ret)) + ret.Add(ret, big.NewInt(1)) + ret.Neg(ret) + } + return ret + } +} + +// reads a bool +func readBool(word []byte) (bool, error) { + for _, b := range word[:31] { + if b != 0 { + return false, errBadBool + } + } + switch word[31] { + case 0: + return false, nil + case 1: + return true, nil + default: + return false, errBadBool + } +} + +// A function type is simply the address with the function selection signature at the end. +// This enforces that standard by always presenting it as a 24-array (address + sig = 24 bytes) +func readFunctionType(t Type, word []byte) (funcTy [24]byte, err error) { + if t.T != FunctionTy { + return [24]byte{}, fmt.Errorf("abi: invalid type in call to make function type byte array") + } + if garbage := binary.BigEndian.Uint64(word[24:32]); garbage != 0 { + err = fmt.Errorf("abi: got improperly encoded function type, got %v", word) + } else { + copy(funcTy[:], word[0:24]) + } + return +} + +// through reflection, creates a fixed array to be read from +func readFixedBytes(t Type, word []byte) (interface{}, error) { + if t.T != FixedBytesTy { + return nil, fmt.Errorf("abi: invalid type in call to make fixed byte array") + } + // convert + array := reflect.New(t.Type).Elem() + + reflect.Copy(array, reflect.ValueOf(word[0:t.Size])) + return array.Interface(), nil + +} + +// iteratively unpack elements +func forEachUnpack(t Type, output []byte, start, size int) (interface{}, error) { + if size < 0 { + return nil, fmt.Errorf("cannot marshal input to array, size is negative (%d)", size) + } + if start+32*size > len(output) { + return nil, fmt.Errorf("abi: cannot marshal in to go array: offset %d would go over slice boundary (len=%d)", len(output), start+32*size) + } + + // this value will become our slice or our array, depending on the type + var refSlice reflect.Value + + if t.T == SliceTy { + // declare our slice + refSlice = reflect.MakeSlice(t.Type, size, size) + } else if t.T == ArrayTy { + // declare our array + refSlice = reflect.New(t.Type).Elem() + } else { + return nil, fmt.Errorf("abi: invalid type in array/slice unpacking stage") + } + + // Arrays have packed elements, resulting in longer unpack steps. + // Slices have just 32 bytes per element (pointing to the contents). + elemSize := getTypeSize(*t.Elem) + + for i, j := start, 0; j < size; i, j = i+elemSize, j+1 { + inter, err := toGoType(i, *t.Elem, output) + if err != nil { + return nil, err + } + + // append the item to our reflect slice + refSlice.Index(j).Set(reflect.ValueOf(inter)) + } + + // return the interface + return refSlice.Interface(), nil +} + +func forTupleUnpack(t Type, output []byte) (interface{}, error) { + retval := reflect.New(t.Type).Elem() + virtualArgs := 0 + for index, elem := range t.TupleElems { + marshalledValue, err := toGoType((index+virtualArgs)*32, *elem, output) + if elem.T == ArrayTy && !isDynamicType(*elem) { + // If we have a static array, like [3]uint256, these are coded as + // just like uint256,uint256,uint256. + // This means that we need to add two 'virtual' arguments when + // we count the index from now on. + // + // Array values nested multiple levels deep are also encoded inline: + // [2][3]uint256: uint256,uint256,uint256,uint256,uint256,uint256 + // + // Calculate the full array size to get the correct offset for the next argument. + // Decrement it by 1, as the normal index increment is still applied. + virtualArgs += getTypeSize(*elem)/32 - 1 + } else if elem.T == TupleTy && !isDynamicType(*elem) { + // If we have a static tuple, like (uint256, bool, uint256), these are + // coded as just like uint256,bool,uint256 + virtualArgs += getTypeSize(*elem)/32 - 1 + } + if err != nil { + return nil, err + } + retval.Field(index).Set(reflect.ValueOf(marshalledValue)) + } + return retval.Interface(), nil +} + +// toGoType parses the output bytes and recursively assigns the value of these bytes +// into a go type with accordance with the ABI spec. +func toGoType(index int, t Type, output []byte) (interface{}, error) { + if index+32 > len(output) { + return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), index+32) + } + + var ( + returnOutput []byte + begin, length int + err error + ) + + // if we require a length prefix, find the beginning word and size returned. + if t.requiresLengthPrefix() { + begin, length, err = lengthPrefixPointsTo(index, output) + if err != nil { + return nil, err + } + } else { + returnOutput = output[index : index+32] + } + + switch t.T { + case TupleTy: + if isDynamicType(t) { + begin, err := tuplePointsTo(index, output) + if err != nil { + return nil, err + } + return forTupleUnpack(t, output[begin:]) + } else { + return forTupleUnpack(t, output[index:]) + } + case SliceTy: + return forEachUnpack(t, output[begin:], 0, length) + case ArrayTy: + if isDynamicType(*t.Elem) { + offset := int64(binary.BigEndian.Uint64(returnOutput[len(returnOutput)-8:])) + return forEachUnpack(t, output[offset:], 0, t.Size) + } + return forEachUnpack(t, output[index:], 0, t.Size) + case StringTy: // variable arrays are written at the end of the return bytes + return string(output[begin : begin+length]), nil + case IntTy, UintTy: + return readInteger(t.T, t.Kind, returnOutput), nil + case BoolTy: + return readBool(returnOutput) + case AddressTy: + return common.BytesToAddress(returnOutput), nil + case HashTy: + return common.BytesToHash(returnOutput), nil + case BytesTy: + return output[begin : begin+length], nil + case FixedBytesTy: + return readFixedBytes(t, returnOutput) + case FunctionTy: + return readFunctionType(t, returnOutput) + default: + return nil, fmt.Errorf("abi: unknown type %v", t.T) + } +} + +// interprets a 32 byte slice as an offset and then determines which indice to look to decode the type. +func lengthPrefixPointsTo(index int, output []byte) (start int, length int, err error) { + bigOffsetEnd := big.NewInt(0).SetBytes(output[index : index+32]) + bigOffsetEnd.Add(bigOffsetEnd, common.Big32) + outputLength := big.NewInt(int64(len(output))) + + if bigOffsetEnd.Cmp(outputLength) > 0 { + return 0, 0, fmt.Errorf("abi: cannot marshal in to go slice: offset %v would go over slice boundary (len=%v)", bigOffsetEnd, outputLength) + } + + if bigOffsetEnd.BitLen() > 63 { + return 0, 0, fmt.Errorf("abi offset larger than int64: %v", bigOffsetEnd) + } + + offsetEnd := int(bigOffsetEnd.Uint64()) + lengthBig := big.NewInt(0).SetBytes(output[offsetEnd-32 : offsetEnd]) + + totalSize := big.NewInt(0) + totalSize.Add(totalSize, bigOffsetEnd) + totalSize.Add(totalSize, lengthBig) + if totalSize.BitLen() > 63 { + return 0, 0, fmt.Errorf("abi: length larger than int64: %v", totalSize) + } + + if totalSize.Cmp(outputLength) > 0 { + return 0, 0, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %v require %v", outputLength, totalSize) + } + start = int(bigOffsetEnd.Uint64()) + length = int(lengthBig.Uint64()) + return +} + +// tuplePointsTo resolves the location reference for dynamic tuple. +func tuplePointsTo(index int, output []byte) (start int, err error) { + offset := big.NewInt(0).SetBytes(output[index : index+32]) + outputLen := big.NewInt(int64(len(output))) + + if offset.Cmp(big.NewInt(int64(len(output)))) > 0 { + return 0, fmt.Errorf("abi: cannot marshal in to go slice: offset %v would go over slice boundary (len=%v)", offset, outputLen) + } + if offset.BitLen() > 63 { + return 0, fmt.Errorf("abi offset larger than int64: %v", offset) + } + return int(offset.Uint64()), nil +} diff --git a/accounts/accounts.go b/accounts/accounts.go new file mode 100644 index 0000000..bca3223 --- /dev/null +++ b/accounts/accounts.go @@ -0,0 +1,222 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +// Package accounts implements high level Ethereum account management. +package accounts + +import ( + "fmt" + "math/big" + + "github.com/ava-labs/coreth/core/types" + ethereum "github.com/ava-labs/go-ethereum" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/event" + "golang.org/x/crypto/sha3" +) + +// Account represents an Ethereum account located at a specific location defined +// by the optional URL field. +type Account struct { + Address common.Address `json:"address"` // Ethereum account address derived from the key + URL URL `json:"url"` // Optional resource locator within a backend +} + +const ( + MimetypeDataWithValidator = "data/validator" + MimetypeTypedData = "data/typed" + MimetypeClique = "application/x-clique-header" + MimetypeTextPlain = "text/plain" +) + +// Wallet represents a software or hardware wallet that might contain one or more +// accounts (derived from the same seed). +type Wallet interface { + // URL retrieves the canonical path under which this wallet is reachable. It is + // user by upper layers to define a sorting order over all wallets from multiple + // backends. + URL() URL + + // Status returns a textual status to aid the user in the current state of the + // wallet. It also returns an error indicating any failure the wallet might have + // encountered. + Status() (string, error) + + // Open initializes access to a wallet instance. It is not meant to unlock or + // decrypt account keys, rather simply to establish a connection to hardware + // wallets and/or to access derivation seeds. + // + // The passphrase parameter may or may not be used by the implementation of a + // particular wallet instance. The reason there is no passwordless open method + // is to strive towards a uniform wallet handling, oblivious to the different + // backend providers. + // + // Please note, if you open a wallet, you must close it to release any allocated + // resources (especially important when working with hardware wallets). + Open(passphrase string) error + + // Close releases any resources held by an open wallet instance. + Close() error + + // Accounts retrieves the list of signing accounts the wallet is currently aware + // of. For hierarchical deterministic wallets, the list will not be exhaustive, + // rather only contain the accounts explicitly pinned during account derivation. + Accounts() []Account + + // Contains returns whether an account is part of this particular wallet or not. + Contains(account Account) bool + + // Derive attempts to explicitly derive a hierarchical deterministic account at + // the specified derivation path. If requested, the derived account will be added + // to the wallet's tracked account list. + Derive(path DerivationPath, pin bool) (Account, error) + + // SelfDerive sets a base account derivation path from which the wallet attempts + // to discover non zero accounts and automatically add them to list of tracked + // accounts. + // + // Note, self derivaton will increment the last component of the specified path + // opposed to decending into a child path to allow discovering accounts starting + // from non zero components. + // + // Some hardware wallets switched derivation paths through their evolution, so + // this method supports providing multiple bases to discover old user accounts + // too. Only the last base will be used to derive the next empty account. + // + // You can disable automatic account discovery by calling SelfDerive with a nil + // chain state reader. + SelfDerive(bases []DerivationPath, chain ethereum.ChainStateReader) + + // SignData requests the wallet to sign the hash of the given data + // It looks up the account specified either solely via its address contained within, + // or optionally with the aid of any location metadata from the embedded URL field. + // + // If the wallet requires additional authentication to sign the request (e.g. + // a password to decrypt the account, or a PIN code o verify the transaction), + // an AuthNeededError instance will be returned, containing infos for the user + // about which fields or actions are needed. The user may retry by providing + // the needed details via SignDataWithPassphrase, or by other means (e.g. unlock + // the account in a keystore). + SignData(account Account, mimeType string, data []byte) ([]byte, error) + + // SignDataWithPassphrase is identical to SignData, but also takes a password + // NOTE: there's an chance that an erroneous call might mistake the two strings, and + // supply password in the mimetype field, or vice versa. Thus, an implementation + // should never echo the mimetype or return the mimetype in the error-response + SignDataWithPassphrase(account Account, passphrase, mimeType string, data []byte) ([]byte, error) + + // SignText requests the wallet to sign the hash of a given piece of data, prefixed + // by the Ethereum prefix scheme + // It looks up the account specified either solely via its address contained within, + // or optionally with the aid of any location metadata from the embedded URL field. + // + // If the wallet requires additional authentication to sign the request (e.g. + // a password to decrypt the account, or a PIN code o verify the transaction), + // an AuthNeededError instance will be returned, containing infos for the user + // about which fields or actions are needed. The user may retry by providing + // the needed details via SignHashWithPassphrase, or by other means (e.g. unlock + // the account in a keystore). + SignText(account Account, text []byte) ([]byte, error) + + // SignTextWithPassphrase is identical to Signtext, but also takes a password + SignTextWithPassphrase(account Account, passphrase string, hash []byte) ([]byte, error) + + // SignTx requests the wallet to sign the given transaction. + // + // It looks up the account specified either solely via its address contained within, + // or optionally with the aid of any location metadata from the embedded URL field. + // + // If the wallet requires additional authentication to sign the request (e.g. + // a password to decrypt the account, or a PIN code to verify the transaction), + // an AuthNeededError instance will be returned, containing infos for the user + // about which fields or actions are needed. The user may retry by providing + // the needed details via SignTxWithPassphrase, or by other means (e.g. unlock + // the account in a keystore). + SignTx(account Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) + + // SignTxWithPassphrase is identical to SignTx, but also takes a password + SignTxWithPassphrase(account Account, passphrase string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) +} + +// Backend is a "wallet provider" that may contain a batch of accounts they can +// sign transactions with and upon request, do so. +type Backend interface { + // Wallets retrieves the list of wallets the backend is currently aware of. + // + // The returned wallets are not opened by default. For software HD wallets this + // means that no base seeds are decrypted, and for hardware wallets that no actual + // connection is established. + // + // The resulting wallet list will be sorted alphabetically based on its internal + // URL assigned by the backend. Since wallets (especially hardware) may come and + // go, the same wallet might appear at a different positions in the list during + // subsequent retrievals. + Wallets() []Wallet + + // Subscribe creates an async subscription to receive notifications when the + // backend detects the arrival or departure of a wallet. + Subscribe(sink chan<- WalletEvent) event.Subscription +} + +// TextHash is a helper function that calculates a hash for the given message that can be +// safely used to calculate a signature from. +// +// The hash is calulcated as +// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}). +// +// This gives context to the signed message and prevents signing of transactions. +func TextHash(data []byte) []byte { + hash, _ := TextAndHash(data) + return hash +} + +// TextAndHash is a helper function that calculates a hash for the given message that can be +// safely used to calculate a signature from. +// +// The hash is calulcated as +// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}). +// +// This gives context to the signed message and prevents signing of transactions. +func TextAndHash(data []byte) ([]byte, string) { + msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), string(data)) + hasher := sha3.NewLegacyKeccak256() + hasher.Write([]byte(msg)) + return hasher.Sum(nil), msg +} + +// WalletEventType represents the different event types that can be fired by +// the wallet subscription subsystem. +type WalletEventType int + +const ( + // WalletArrived is fired when a new wallet is detected either via USB or via + // a filesystem event in the keystore. + WalletArrived WalletEventType = iota + + // WalletOpened is fired when a wallet is successfully opened with the purpose + // of starting any background processes such as automatic key derivation. + WalletOpened + + // WalletDropped + WalletDropped +) + +// WalletEvent is an event fired by an account backend when a wallet arrival or +// departure is detected. +type WalletEvent struct { + Wallet Wallet // Wallet instance arrived or departed + Kind WalletEventType // Event type that happened in the system +} diff --git a/accounts/errors.go b/accounts/errors.go new file mode 100644 index 0000000..2fed35f --- /dev/null +++ b/accounts/errors.go @@ -0,0 +1,68 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package accounts + +import ( + "errors" + "fmt" +) + +// ErrUnknownAccount is returned for any requested operation for which no backend +// provides the specified account. +var ErrUnknownAccount = errors.New("unknown account") + +// ErrUnknownWallet is returned for any requested operation for which no backend +// provides the specified wallet. +var ErrUnknownWallet = errors.New("unknown wallet") + +// ErrNotSupported is returned when an operation is requested from an account +// backend that it does not support. +var ErrNotSupported = errors.New("not supported") + +// ErrInvalidPassphrase is returned when a decryption operation receives a bad +// passphrase. +var ErrInvalidPassphrase = errors.New("invalid password") + +// ErrWalletAlreadyOpen is returned if a wallet is attempted to be opened the +// second time. +var ErrWalletAlreadyOpen = errors.New("wallet already open") + +// ErrWalletClosed is returned if a wallet is attempted to be opened the +// secodn time. +var ErrWalletClosed = errors.New("wallet closed") + +// AuthNeededError is returned by backends for signing requests where the user +// is required to provide further authentication before signing can succeed. +// +// This usually means either that a password needs to be supplied, or perhaps a +// one time PIN code displayed by some hardware device. +type AuthNeededError struct { + Needed string // Extra authentication the user needs to provide +} + +// NewAuthNeededError creates a new authentication error with the extra details +// about the needed fields set. +func NewAuthNeededError(needed string) error { + return &AuthNeededError{ + Needed: needed, + } +} + +// Error implements the standard error interface. +func (err *AuthNeededError) Error() string { + return fmt.Sprintf("authentication needed: %s", err.Needed) +} diff --git a/accounts/external/backend.go b/accounts/external/backend.go new file mode 100644 index 0000000..16e201d --- /dev/null +++ b/accounts/external/backend.go @@ -0,0 +1,231 @@ +// Copyright 2019 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package external + +import ( + "fmt" + "math/big" + "sync" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/coreth/core/types" + "github.com/ava-labs/coreth/internal/ethapi" + "github.com/ava-labs/coreth/rpc" + "github.com/ava-labs/go-ethereum" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/common/hexutil" + "github.com/ava-labs/go-ethereum/event" + "github.com/ava-labs/go-ethereum/log" + "github.com/ava-labs/go-ethereum/signer/core" +) + +type ExternalBackend struct { + signers []accounts.Wallet +} + +func (eb *ExternalBackend) Wallets() []accounts.Wallet { + return eb.signers +} + +func NewExternalBackend(endpoint string) (*ExternalBackend, error) { + signer, err := NewExternalSigner(endpoint) + if err != nil { + return nil, err + } + return &ExternalBackend{ + signers: []accounts.Wallet{signer}, + }, nil +} + +func (eb *ExternalBackend) Subscribe(sink chan<- accounts.WalletEvent) event.Subscription { + return event.NewSubscription(func(quit <-chan struct{}) error { + <-quit + return nil + }) +} + +// ExternalSigner provides an API to interact with an external signer (clef) +// It proxies request to the external signer while forwarding relevant +// request headers +type ExternalSigner struct { + client *rpc.Client + endpoint string + status string + cacheMu sync.RWMutex + cache []accounts.Account +} + +func NewExternalSigner(endpoint string) (*ExternalSigner, error) { + client, err := rpc.Dial(endpoint) + if err != nil { + return nil, err + } + extsigner := &ExternalSigner{ + client: client, + endpoint: endpoint, + } + // Check if reachable + version, err := extsigner.pingVersion() + if err != nil { + return nil, err + } + extsigner.status = fmt.Sprintf("ok [version=%v]", version) + return extsigner, nil +} + +func (api *ExternalSigner) URL() accounts.URL { + return accounts.URL{ + Scheme: "extapi", + Path: api.endpoint, + } +} + +func (api *ExternalSigner) Status() (string, error) { + return api.status, nil +} + +func (api *ExternalSigner) Open(passphrase string) error { + return fmt.Errorf("operation not supported on external signers") +} + +func (api *ExternalSigner) Close() error { + return fmt.Errorf("operation not supported on external signers") +} + +func (api *ExternalSigner) Accounts() []accounts.Account { + var accnts []accounts.Account + res, err := api.listAccounts() + if err != nil { + log.Error("account listing failed", "error", err) + return accnts + } + for _, addr := range res { + accnts = append(accnts, accounts.Account{ + URL: accounts.URL{ + Scheme: "extapi", + Path: api.endpoint, + }, + Address: addr, + }) + } + api.cacheMu.Lock() + api.cache = accnts + api.cacheMu.Unlock() + return accnts +} + +func (api *ExternalSigner) Contains(account accounts.Account) bool { + api.cacheMu.RLock() + defer api.cacheMu.RUnlock() + for _, a := range api.cache { + if a.Address == account.Address && (account.URL == (accounts.URL{}) || account.URL == api.URL()) { + return true + } + } + return false +} + +func (api *ExternalSigner) Derive(path accounts.DerivationPath, pin bool) (accounts.Account, error) { + return accounts.Account{}, fmt.Errorf("operation not supported on external signers") +} + +func (api *ExternalSigner) SelfDerive(bases []accounts.DerivationPath, chain ethereum.ChainStateReader) { + log.Error("operation SelfDerive not supported on external signers") +} + +func (api *ExternalSigner) signHash(account accounts.Account, hash []byte) ([]byte, error) { + return []byte{}, fmt.Errorf("operation not supported on external signers") +} + +// SignData signs keccak256(data). The mimetype parameter describes the type of data being signed +func (api *ExternalSigner) SignData(account accounts.Account, mimeType string, data []byte) ([]byte, error) { + var res hexutil.Bytes + var signAddress = common.NewMixedcaseAddress(account.Address) + if err := api.client.Call(&res, "account_signData", + mimeType, + &signAddress, // Need to use the pointer here, because of how MarshalJSON is defined + hexutil.Encode(data)); err != nil { + return nil, err + } + // If V is on 27/28-form, convert to to 0/1 for Clique + if mimeType == accounts.MimetypeClique && (res[64] == 27 || res[64] == 28) { + res[64] -= 27 // Transform V from 27/28 to 0/1 for Clique use + } + return res, nil +} + +func (api *ExternalSigner) SignText(account accounts.Account, text []byte) ([]byte, error) { + var res hexutil.Bytes + var signAddress = common.NewMixedcaseAddress(account.Address) + if err := api.client.Call(&res, "account_signData", + accounts.MimetypeTextPlain, + &signAddress, // Need to use the pointer here, because of how MarshalJSON is defined + hexutil.Encode(text)); err != nil { + return nil, err + } + return res, nil +} + +func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) { + res := ethapi.SignTransactionResult{} + data := hexutil.Bytes(tx.Data()) + var to *common.MixedcaseAddress + if tx.To() != nil { + t := common.NewMixedcaseAddress(*tx.To()) + to = &t + } + args := &core.SendTxArgs{ + Data: &data, + Nonce: hexutil.Uint64(tx.Nonce()), + Value: hexutil.Big(*tx.Value()), + Gas: hexutil.Uint64(tx.Gas()), + GasPrice: hexutil.Big(*tx.GasPrice()), + To: to, + From: common.NewMixedcaseAddress(account.Address), + } + if err := api.client.Call(&res, "account_signTransaction", args); err != nil { + return nil, err + } + return res.Tx, nil +} + +func (api *ExternalSigner) SignTextWithPassphrase(account accounts.Account, passphrase string, text []byte) ([]byte, error) { + return []byte{}, fmt.Errorf("password-operations not supported on external signers") +} + +func (api *ExternalSigner) SignTxWithPassphrase(account accounts.Account, passphrase string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) { + return nil, fmt.Errorf("password-operations not supported on external signers") +} +func (api *ExternalSigner) SignDataWithPassphrase(account accounts.Account, passphrase, mimeType string, data []byte) ([]byte, error) { + return nil, fmt.Errorf("password-operations not supported on external signers") +} + +func (api *ExternalSigner) listAccounts() ([]common.Address, error) { + var res []common.Address + if err := api.client.Call(&res, "account_list"); err != nil { + return nil, err + } + return res, nil +} + +func (api *ExternalSigner) pingVersion() (string, error) { + var v string + if err := api.client.Call(&v, "account_version"); err != nil { + return "", err + } + return v, nil +} diff --git a/accounts/hd.go b/accounts/hd.go new file mode 100644 index 0000000..75c4761 --- /dev/null +++ b/accounts/hd.go @@ -0,0 +1,152 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package accounts + +import ( + "encoding/json" + "errors" + "fmt" + "math" + "math/big" + "strings" +) + +// DefaultRootDerivationPath is the root path to which custom derivation endpoints +// are appended. As such, the first account will be at m/44'/60'/0'/0, the second +// at m/44'/60'/0'/1, etc. +var DefaultRootDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0} + +// DefaultBaseDerivationPath is the base path from which custom derivation endpoints +// are incremented. As such, the first account will be at m/44'/60'/0'/0/0, the second +// at m/44'/60'/0'/0/1, etc. +var DefaultBaseDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0} + +// LegacyLedgerBaseDerivationPath is the legacy base path from which custom derivation +// endpoints are incremented. As such, the first account will be at m/44'/60'/0'/0, the +// second at m/44'/60'/0'/1, etc. +var LegacyLedgerBaseDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0} + +// DerivationPath represents the computer friendly version of a hierarchical +// deterministic wallet account derivaion path. +// +// The BIP-32 spec https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki +// defines derivation paths to be of the form: +// +// m / purpose' / coin_type' / account' / change / address_index +// +// The BIP-44 spec https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki +// defines that the `purpose` be 44' (or 0x8000002C) for crypto currencies, and +// SLIP-44 https://github.com/satoshilabs/slips/blob/master/slip-0044.md assigns +// the `coin_type` 60' (or 0x8000003C) to Ethereum. +// +// The root path for Ethereum is m/44'/60'/0'/0 according to the specification +// from https://github.com/ethereum/EIPs/issues/84, albeit it's not set in stone +// yet whether accounts should increment the last component or the children of +// that. We will go with the simpler approach of incrementing the last component. +type DerivationPath []uint32 + +// ParseDerivationPath converts a user specified derivation path string to the +// internal binary representation. +// +// Full derivation paths need to start with the `m/` prefix, relative derivation +// paths (which will get appended to the default root path) must not have prefixes +// in front of the first element. Whitespace is ignored. +func ParseDerivationPath(path string) (DerivationPath, error) { + var result DerivationPath + + // Handle absolute or relative paths + components := strings.Split(path, "/") + switch { + case len(components) == 0: + return nil, errors.New("empty derivation path") + + case strings.TrimSpace(components[0]) == "": + return nil, errors.New("ambiguous path: use 'm/' prefix for absolute paths, or no leading '/' for relative ones") + + case strings.TrimSpace(components[0]) == "m": + components = components[1:] + + default: + result = append(result, DefaultRootDerivationPath...) + } + // All remaining components are relative, append one by one + if len(components) == 0 { + return nil, errors.New("empty derivation path") // Empty relative paths + } + for _, component := range components { + // Ignore any user added whitespace + component = strings.TrimSpace(component) + var value uint32 + + // Handle hardened paths + if strings.HasSuffix(component, "'") { + value = 0x80000000 + component = strings.TrimSpace(strings.TrimSuffix(component, "'")) + } + // Handle the non hardened component + bigval, ok := new(big.Int).SetString(component, 0) + if !ok { + return nil, fmt.Errorf("invalid component: %s", component) + } + max := math.MaxUint32 - value + if bigval.Sign() < 0 || bigval.Cmp(big.NewInt(int64(max))) > 0 { + if value == 0 { + return nil, fmt.Errorf("component %v out of allowed range [0, %d]", bigval, max) + } + return nil, fmt.Errorf("component %v out of allowed hardened range [0, %d]", bigval, max) + } + value += uint32(bigval.Uint64()) + + // Append and repeat + result = append(result, value) + } + return result, nil +} + +// String implements the stringer interface, converting a binary derivation path +// to its canonical representation. +func (path DerivationPath) String() string { + result := "m" + for _, component := range path { + var hardened bool + if component >= 0x80000000 { + component -= 0x80000000 + hardened = true + } + result = fmt.Sprintf("%s/%d", result, component) + if hardened { + result += "'" + } + } + return result +} + +// MarshalJSON turns a derivation path into its json-serialized string +func (path DerivationPath) MarshalJSON() ([]byte, error) { + return json.Marshal(path.String()) +} + +// UnmarshalJSON a json-serialized string back into a derivation path +func (path *DerivationPath) UnmarshalJSON(b []byte) error { + var dp string + var err error + if err = json.Unmarshal(b, &dp); err != nil { + return err + } + *path, err = ParseDerivationPath(dp) + return err +} diff --git a/accounts/keystore/account_cache.go b/accounts/keystore/account_cache.go new file mode 100644 index 0000000..2067ccb --- /dev/null +++ b/accounts/keystore/account_cache.go @@ -0,0 +1,301 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package keystore + +import ( + "bufio" + "encoding/json" + "fmt" + "os" + "path/filepath" + "sort" + "strings" + "sync" + "time" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/log" + mapset "github.com/deckarep/golang-set" +) + +// Minimum amount of time between cache reloads. This limit applies if the platform does +// not support change notifications. It also applies if the keystore directory does not +// exist yet, the code will attempt to create a watcher at most this often. +const minReloadInterval = 2 * time.Second + +type accountsByURL []accounts.Account + +func (s accountsByURL) Len() int { return len(s) } +func (s accountsByURL) Less(i, j int) bool { return s[i].URL.Cmp(s[j].URL) < 0 } +func (s accountsByURL) Swap(i, j int) { s[i], s[j] = s[j], s[i] } + +// AmbiguousAddrError is returned when attempting to unlock +// an address for which more than one file exists. +type AmbiguousAddrError struct { + Addr common.Address + Matches []accounts.Account +} + +func (err *AmbiguousAddrError) Error() string { + files := "" + for i, a := range err.Matches { + files += a.URL.Path + if i < len(err.Matches)-1 { + files += ", " + } + } + return fmt.Sprintf("multiple keys match address (%s)", files) +} + +// accountCache is a live index of all accounts in the keystore. +type accountCache struct { + keydir string + watcher *watcher + mu sync.Mutex + all accountsByURL + byAddr map[common.Address][]accounts.Account + throttle *time.Timer + notify chan struct{} + fileC fileCache +} + +func newAccountCache(keydir string) (*accountCache, chan struct{}) { + ac := &accountCache{ + keydir: keydir, + byAddr: make(map[common.Address][]accounts.Account), + notify: make(chan struct{}, 1), + fileC: fileCache{all: mapset.NewThreadUnsafeSet()}, + } + ac.watcher = newWatcher(ac) + return ac, ac.notify +} + +func (ac *accountCache) accounts() []accounts.Account { + ac.maybeReload() + ac.mu.Lock() + defer ac.mu.Unlock() + cpy := make([]accounts.Account, len(ac.all)) + copy(cpy, ac.all) + return cpy +} + +func (ac *accountCache) hasAddress(addr common.Address) bool { + ac.maybeReload() + ac.mu.Lock() + defer ac.mu.Unlock() + return len(ac.byAddr[addr]) > 0 +} + +func (ac *accountCache) add(newAccount accounts.Account) { + ac.mu.Lock() + defer ac.mu.Unlock() + + i := sort.Search(len(ac.all), func(i int) bool { return ac.all[i].URL.Cmp(newAccount.URL) >= 0 }) + if i < len(ac.all) && ac.all[i] == newAccount { + return + } + // newAccount is not in the cache. + ac.all = append(ac.all, accounts.Account{}) + copy(ac.all[i+1:], ac.all[i:]) + ac.all[i] = newAccount + ac.byAddr[newAccount.Address] = append(ac.byAddr[newAccount.Address], newAccount) +} + +// note: removed needs to be unique here (i.e. both File and Address must be set). +func (ac *accountCache) delete(removed accounts.Account) { + ac.mu.Lock() + defer ac.mu.Unlock() + + ac.all = removeAccount(ac.all, removed) + if ba := removeAccount(ac.byAddr[removed.Address], removed); len(ba) == 0 { + delete(ac.byAddr, removed.Address) + } else { + ac.byAddr[removed.Address] = ba + } +} + +// deleteByFile removes an account referenced by the given path. +func (ac *accountCache) deleteByFile(path string) { + ac.mu.Lock() + defer ac.mu.Unlock() + i := sort.Search(len(ac.all), func(i int) bool { return ac.all[i].URL.Path >= path }) + + if i < len(ac.all) && ac.all[i].URL.Path == path { + removed := ac.all[i] + ac.all = append(ac.all[:i], ac.all[i+1:]...) + if ba := removeAccount(ac.byAddr[removed.Address], removed); len(ba) == 0 { + delete(ac.byAddr, removed.Address) + } else { + ac.byAddr[removed.Address] = ba + } + } +} + +func removeAccount(slice []accounts.Account, elem accounts.Account) []accounts.Account { + for i := range slice { + if slice[i] == elem { + return append(slice[:i], slice[i+1:]...) + } + } + return slice +} + +// find returns the cached account for address if there is a unique match. +// The exact matching rules are explained by the documentation of accounts.Account. +// Callers must hold ac.mu. +func (ac *accountCache) find(a accounts.Account) (accounts.Account, error) { + // Limit search to address candidates if possible. + matches := ac.all + if (a.Address != common.Address{}) { + matches = ac.byAddr[a.Address] + } + if a.URL.Path != "" { + // If only the basename is specified, complete the path. + if !strings.ContainsRune(a.URL.Path, filepath.Separator) { + a.URL.Path = filepath.Join(ac.keydir, a.URL.Path) + } + for i := range matches { + if matches[i].URL == a.URL { + return matches[i], nil + } + } + if (a.Address == common.Address{}) { + return accounts.Account{}, ErrNoMatch + } + } + switch len(matches) { + case 1: + return matches[0], nil + case 0: + return accounts.Account{}, ErrNoMatch + default: + err := &AmbiguousAddrError{Addr: a.Address, Matches: make([]accounts.Account, len(matches))} + copy(err.Matches, matches) + sort.Sort(accountsByURL(err.Matches)) + return accounts.Account{}, err + } +} + +func (ac *accountCache) maybeReload() { + ac.mu.Lock() + + if ac.watcher.running { + ac.mu.Unlock() + return // A watcher is running and will keep the cache up-to-date. + } + if ac.throttle == nil { + ac.throttle = time.NewTimer(0) + } else { + select { + case <-ac.throttle.C: + default: + ac.mu.Unlock() + return // The cache was reloaded recently. + } + } + // No watcher running, start it. + ac.watcher.start() + ac.throttle.Reset(minReloadInterval) + ac.mu.Unlock() + ac.scanAccounts() +} + +func (ac *accountCache) close() { + ac.mu.Lock() + ac.watcher.close() + if ac.throttle != nil { + ac.throttle.Stop() + } + if ac.notify != nil { + close(ac.notify) + ac.notify = nil + } + ac.mu.Unlock() +} + +// scanAccounts checks if any changes have occurred on the filesystem, and +// updates the account cache accordingly +func (ac *accountCache) scanAccounts() error { + // Scan the entire folder metadata for file changes + creates, deletes, updates, err := ac.fileC.scan(ac.keydir) + if err != nil { + log.Debug("Failed to reload keystore contents", "err", err) + return err + } + if creates.Cardinality() == 0 && deletes.Cardinality() == 0 && updates.Cardinality() == 0 { + return nil + } + // Create a helper method to scan the contents of the key files + var ( + buf = new(bufio.Reader) + key struct { + Address string `json:"address"` + } + ) + readAccount := func(path string) *accounts.Account { + fd, err := os.Open(path) + if err != nil { + log.Trace("Failed to open keystore file", "path", path, "err", err) + return nil + } + defer fd.Close() + buf.Reset(fd) + // Parse the address. + key.Address = "" + err = json.NewDecoder(buf).Decode(&key) + addr := common.HexToAddress(key.Address) + switch { + case err != nil: + log.Debug("Failed to decode keystore key", "path", path, "err", err) + case (addr == common.Address{}): + log.Debug("Failed to decode keystore key", "path", path, "err", "missing or zero address") + default: + return &accounts.Account{ + Address: addr, + URL: accounts.URL{Scheme: KeyStoreScheme, Path: path}, + } + } + return nil + } + // Process all the file diffs + start := time.Now() + + for _, p := range creates.ToSlice() { + if a := readAccount(p.(string)); a != nil { + ac.add(*a) + } + } + for _, p := range deletes.ToSlice() { + ac.deleteByFile(p.(string)) + } + for _, p := range updates.ToSlice() { + path := p.(string) + ac.deleteByFile(path) + if a := readAccount(path); a != nil { + ac.add(*a) + } + } + end := time.Now() + + select { + case ac.notify <- struct{}{}: + default: + } + log.Trace("Handled keystore changes", "time", end.Sub(start)) + return nil +} diff --git a/accounts/keystore/file_cache.go b/accounts/keystore/file_cache.go new file mode 100644 index 0000000..ac87f0c --- /dev/null +++ b/accounts/keystore/file_cache.go @@ -0,0 +1,102 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package keystore + +import ( + "io/ioutil" + "os" + "path/filepath" + "strings" + "sync" + "time" + + mapset "github.com/deckarep/golang-set" + "github.com/ava-labs/go-ethereum/log" +) + +// fileCache is a cache of files seen during scan of keystore. +type fileCache struct { + all mapset.Set // Set of all files from the keystore folder + lastMod time.Time // Last time instance when a file was modified + mu sync.RWMutex +} + +// scan performs a new scan on the given directory, compares against the already +// cached filenames, and returns file sets: creates, deletes, updates. +func (fc *fileCache) scan(keyDir string) (mapset.Set, mapset.Set, mapset.Set, error) { + t0 := time.Now() + + // List all the failes from the keystore folder + files, err := ioutil.ReadDir(keyDir) + if err != nil { + return nil, nil, nil, err + } + t1 := time.Now() + + fc.mu.Lock() + defer fc.mu.Unlock() + + // Iterate all the files and gather their metadata + all := mapset.NewThreadUnsafeSet() + mods := mapset.NewThreadUnsafeSet() + + var newLastMod time.Time + for _, fi := range files { + path := filepath.Join(keyDir, fi.Name()) + // Skip any non-key files from the folder + if nonKeyFile(fi) { + log.Trace("Ignoring file on account scan", "path", path) + continue + } + // Gather the set of all and fresly modified files + all.Add(path) + + modified := fi.ModTime() + if modified.After(fc.lastMod) { + mods.Add(path) + } + if modified.After(newLastMod) { + newLastMod = modified + } + } + t2 := time.Now() + + // Update the tracked files and return the three sets + deletes := fc.all.Difference(all) // Deletes = previous - current + creates := all.Difference(fc.all) // Creates = current - previous + updates := mods.Difference(creates) // Updates = modified - creates + + fc.all, fc.lastMod = all, newLastMod + t3 := time.Now() + + // Report on the scanning stats and return + log.Debug("FS scan times", "list", t1.Sub(t0), "set", t2.Sub(t1), "diff", t3.Sub(t2)) + return creates, deletes, updates, nil +} + +// nonKeyFile ignores editor backups, hidden files and folders/symlinks. +func nonKeyFile(fi os.FileInfo) bool { + // Skip editor backups and UNIX-style hidden files. + if strings.HasSuffix(fi.Name(), "~") || strings.HasPrefix(fi.Name(), ".") { + return true + } + // Skip misc special files, directories (yes, symlinks too). + if fi.IsDir() || fi.Mode()&os.ModeType != 0 { + return true + } + return false +} diff --git a/accounts/keystore/key.go b/accounts/keystore/key.go new file mode 100644 index 0000000..3654daa --- /dev/null +++ b/accounts/keystore/key.go @@ -0,0 +1,232 @@ +// Copyright 2014 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package keystore + +import ( + "bytes" + "crypto/ecdsa" + "encoding/hex" + "encoding/json" + "fmt" + "io" + "io/ioutil" + "os" + "path/filepath" + "strings" + "time" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/crypto" + "github.com/pborman/uuid" +) + +const ( + version = 3 +) + +type Key struct { + Id uuid.UUID // Version 4 "random" for unique id not derived from key data + // to simplify lookups we also store the address + Address common.Address + // we only store privkey as pubkey/address can be derived from it + // privkey in this struct is always in plaintext + PrivateKey *ecdsa.PrivateKey +} + +type keyStore interface { + // Loads and decrypts the key from disk. + GetKey(addr common.Address, filename string, auth string) (*Key, error) + // Writes and encrypts the key. + StoreKey(filename string, k *Key, auth string) error + // Joins filename with the key directory unless it is already absolute. + JoinPath(filename string) string +} + +type plainKeyJSON struct { + Address string `json:"address"` + PrivateKey string `json:"privatekey"` + Id string `json:"id"` + Version int `json:"version"` +} + +type encryptedKeyJSONV3 struct { + Address string `json:"address"` + Crypto CryptoJSON `json:"crypto"` + Id string `json:"id"` + Version int `json:"version"` +} + +type encryptedKeyJSONV1 struct { + Address string `json:"address"` + Crypto CryptoJSON `json:"crypto"` + Id string `json:"id"` + Version string `json:"version"` +} + +type CryptoJSON struct { + Cipher string `json:"cipher"` + CipherText string `json:"ciphertext"` + CipherParams cipherparamsJSON `json:"cipherparams"` + KDF string `json:"kdf"` + KDFParams map[string]interface{} `json:"kdfparams"` + MAC string `json:"mac"` +} + +type cipherparamsJSON struct { + IV string `json:"iv"` +} + +func (k *Key) MarshalJSON() (j []byte, err error) { + jStruct := plainKeyJSON{ + hex.EncodeToString(k.Address[:]), + hex.EncodeToString(crypto.FromECDSA(k.PrivateKey)), + k.Id.String(), + version, + } + j, err = json.Marshal(jStruct) + return j, err +} + +func (k *Key) UnmarshalJSON(j []byte) (err error) { + keyJSON := new(plainKeyJSON) + err = json.Unmarshal(j, &keyJSON) + if err != nil { + return err + } + + u := new(uuid.UUID) + *u = uuid.Parse(keyJSON.Id) + k.Id = *u + addr, err := hex.DecodeString(keyJSON.Address) + if err != nil { + return err + } + privkey, err := crypto.HexToECDSA(keyJSON.PrivateKey) + if err != nil { + return err + } + + k.Address = common.BytesToAddress(addr) + k.PrivateKey = privkey + + return nil +} + +func newKeyFromECDSA(privateKeyECDSA *ecdsa.PrivateKey) *Key { + id := uuid.NewRandom() + key := &Key{ + Id: id, + Address: crypto.PubkeyToAddress(privateKeyECDSA.PublicKey), + PrivateKey: privateKeyECDSA, + } + return key +} + +// NewKeyForDirectICAP generates a key whose address fits into < 155 bits so it can fit +// into the Direct ICAP spec. for simplicity and easier compatibility with other libs, we +// retry until the first byte is 0. +func NewKeyForDirectICAP(rand io.Reader) *Key { + randBytes := make([]byte, 64) + _, err := rand.Read(randBytes) + if err != nil { + panic("key generation: could not read from random source: " + err.Error()) + } + reader := bytes.NewReader(randBytes) + privateKeyECDSA, err := ecdsa.GenerateKey(crypto.S256(), reader) + if err != nil { + panic("key generation: ecdsa.GenerateKey failed: " + err.Error()) + } + key := newKeyFromECDSA(privateKeyECDSA) + if !strings.HasPrefix(key.Address.Hex(), "0x00") { + return NewKeyForDirectICAP(rand) + } + return key +} + +func newKey(rand io.Reader) (*Key, error) { + privateKeyECDSA, err := ecdsa.GenerateKey(crypto.S256(), rand) + if err != nil { + return nil, err + } + return newKeyFromECDSA(privateKeyECDSA), nil +} + +func storeNewKey(ks keyStore, rand io.Reader, auth string) (*Key, accounts.Account, error) { + key, err := newKey(rand) + if err != nil { + return nil, accounts.Account{}, err + } + a := accounts.Account{ + Address: key.Address, + URL: accounts.URL{Scheme: KeyStoreScheme, Path: ks.JoinPath(keyFileName(key.Address))}, + } + if err := ks.StoreKey(a.URL.Path, key, auth); err != nil { + zeroKey(key.PrivateKey) + return nil, a, err + } + return key, a, err +} + +func writeTemporaryKeyFile(file string, content []byte) (string, error) { + // Create the keystore directory with appropriate permissions + // in case it is not present yet. + const dirPerm = 0700 + if err := os.MkdirAll(filepath.Dir(file), dirPerm); err != nil { + return "", err + } + // Atomic write: create a temporary hidden file first + // then move it into place. TempFile assigns mode 0600. + f, err := ioutil.TempFile(filepath.Dir(file), "."+filepath.Base(file)+".tmp") + if err != nil { + return "", err + } + if _, err := f.Write(content); err != nil { + f.Close() + os.Remove(f.Name()) + return "", err + } + f.Close() + return f.Name(), nil +} + +func writeKeyFile(file string, content []byte) error { + name, err := writeTemporaryKeyFile(file, content) + if err != nil { + return err + } + return os.Rename(name, file) +} + +// keyFileName implements the naming convention for keyfiles: +// UTC--<created_at UTC ISO8601>-<address hex> +func keyFileName(keyAddr common.Address) string { + ts := time.Now().UTC() + return fmt.Sprintf("UTC--%s--%s", toISO8601(ts), hex.EncodeToString(keyAddr[:])) +} + +func toISO8601(t time.Time) string { + var tz string + name, offset := t.Zone() + if name == "UTC" { + tz = "Z" + } else { + tz = fmt.Sprintf("%03d00", offset/3600) + } + return fmt.Sprintf("%04d-%02d-%02dT%02d-%02d-%02d.%09d%s", + t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), tz) +} diff --git a/accounts/keystore/keystore.go b/accounts/keystore/keystore.go new file mode 100644 index 0000000..a3ce33f --- /dev/null +++ b/accounts/keystore/keystore.go @@ -0,0 +1,495 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +// Package keystore implements encrypted storage of secp256k1 private keys. +// +// Keys are stored as encrypted JSON files according to the Web3 Secret Storage specification. +// See https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition for more information. +package keystore + +import ( + "crypto/ecdsa" + crand "crypto/rand" + "errors" + "fmt" + "math/big" + "os" + "path/filepath" + "reflect" + "runtime" + "sync" + "time" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/coreth/core/types" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/crypto" + "github.com/ava-labs/go-ethereum/event" +) + +var ( + ErrLocked = accounts.NewAuthNeededError("password or unlock") + ErrNoMatch = errors.New("no key for given address or file") + ErrDecrypt = errors.New("could not decrypt key with given password") +) + +// KeyStoreType is the reflect type of a keystore backend. +var KeyStoreType = reflect.TypeOf(&KeyStore{}) + +// KeyStoreScheme is the protocol scheme prefixing account and wallet URLs. +const KeyStoreScheme = "keystore" + +// Maximum time between wallet refreshes (if filesystem notifications don't work). +const walletRefreshCycle = 3 * time.Second + +// KeyStore manages a key storage directory on disk. +type KeyStore struct { + storage keyStore // Storage backend, might be cleartext or encrypted + cache *accountCache // In-memory account cache over the filesystem storage + changes chan struct{} // Channel receiving change notifications from the cache + unlocked map[common.Address]*unlocked // Currently unlocked account (decrypted private keys) + + wallets []accounts.Wallet // Wallet wrappers around the individual key files + updateFeed event.Feed // Event feed to notify wallet additions/removals + updateScope event.SubscriptionScope // Subscription scope tracking current live listeners + updating bool // Whether the event notification loop is running + + mu sync.RWMutex +} + +type unlocked struct { + *Key + abort chan struct{} +} + +// NewKeyStore creates a keystore for the given directory. +func NewKeyStore(keydir string, scryptN, scryptP int) *KeyStore { + keydir, _ = filepath.Abs(keydir) + ks := &KeyStore{storage: &keyStorePassphrase{keydir, scryptN, scryptP, false}} + ks.init(keydir) + return ks +} + +// NewPlaintextKeyStore creates a keystore for the given directory. +// Deprecated: Use NewKeyStore. +func NewPlaintextKeyStore(keydir string) *KeyStore { + keydir, _ = filepath.Abs(keydir) + ks := &KeyStore{storage: &keyStorePlain{keydir}} + ks.init(keydir) + return ks +} + +func (ks *KeyStore) init(keydir string) { + // Lock the mutex since the account cache might call back with events + ks.mu.Lock() + defer ks.mu.Unlock() + + // Initialize the set of unlocked keys and the account cache + ks.unlocked = make(map[common.Address]*unlocked) + ks.cache, ks.changes = newAccountCache(keydir) + + // TODO: In order for this finalizer to work, there must be no references + // to ks. addressCache doesn't keep a reference but unlocked keys do, + // so the finalizer will not trigger until all timed unlocks have expired. + runtime.SetFinalizer(ks, func(m *KeyStore) { + m.cache.close() + }) + // Create the initial list of wallets from the cache + accs := ks.cache.accounts() + ks.wallets = make([]accounts.Wallet, len(accs)) + for i := 0; i < len(accs); i++ { + ks.wallets[i] = &keystoreWallet{account: accs[i], keystore: ks} + } +} + +// Wallets implements accounts.Backend, returning all single-key wallets from the +// keystore directory. +func (ks *KeyStore) Wallets() []accounts.Wallet { + // Make sure the list of wallets is in sync with the account cache + ks.refreshWallets() + + ks.mu.RLock() + defer ks.mu.RUnlock() + + cpy := make([]accounts.Wallet, len(ks.wallets)) + copy(cpy, ks.wallets) + return cpy +} + +// refreshWallets retrieves the current account list and based on that does any +// necessary wallet refreshes. +func (ks *KeyStore) refreshWallets() { + // Retrieve the current list of accounts + ks.mu.Lock() + accs := ks.cache.accounts() + + // Transform the current list of wallets into the new one + var ( + wallets = make([]accounts.Wallet, 0, len(accs)) + events []accounts.WalletEvent + ) + + for _, account := range accs { + // Drop wallets while they were in front of the next account + for len(ks.wallets) > 0 && ks.wallets[0].URL().Cmp(account.URL) < 0 { + events = append(events, accounts.WalletEvent{Wallet: ks.wallets[0], Kind: accounts.WalletDropped}) + ks.wallets = ks.wallets[1:] + } + // If there are no more wallets or the account is before the next, wrap new wallet + if len(ks.wallets) == 0 || ks.wallets[0].URL().Cmp(account.URL) > 0 { + wallet := &keystoreWallet{account: account, keystore: ks} + + events = append(events, accounts.WalletEvent{Wallet: wallet, Kind: accounts.WalletArrived}) + wallets = append(wallets, wallet) + continue + } + // If the account is the same as the first wallet, keep it + if ks.wallets[0].Accounts()[0] == account { + wallets = append(wallets, ks.wallets[0]) + ks.wallets = ks.wallets[1:] + continue + } + } + // Drop any leftover wallets and set the new batch + for _, wallet := range ks.wallets { + events = append(events, accounts.WalletEvent{Wallet: wallet, Kind: accounts.WalletDropped}) + } + ks.wallets = wallets + ks.mu.Unlock() + + // Fire all wallet events and return + for _, event := range events { + ks.updateFeed.Send(event) + } +} + +// Subscribe implements accounts.Backend, creating an async subscription to +// receive notifications on the addition or removal of keystore wallets. +func (ks *KeyStore) Subscribe(sink chan<- accounts.WalletEvent) event.Subscription { + // We need the mutex to reliably start/stop the update loop + ks.mu.Lock() + defer ks.mu.Unlock() + + // Subscribe the caller and track the subscriber count + sub := ks.updateScope.Track(ks.updateFeed.Subscribe(sink)) + + // Subscribers require an active notification loop, start it + if !ks.updating { + ks.updating = true + go ks.updater() + } + return sub +} + +// updater is responsible for maintaining an up-to-date list of wallets stored in +// the keystore, and for firing wallet addition/removal events. It listens for +// account change events from the underlying account cache, and also periodically +// forces a manual refresh (only triggers for systems where the filesystem notifier +// is not running). +func (ks *KeyStore) updater() { + for { + // Wait for an account update or a refresh timeout + select { + case <-ks.changes: + case <-time.After(walletRefreshCycle): + } + // Run the wallet refresher + ks.refreshWallets() + + // If all our subscribers left, stop the updater + ks.mu.Lock() + if ks.updateScope.Count() == 0 { + ks.updating = false + ks.mu.Unlock() + return + } + ks.mu.Unlock() + } +} + +// HasAddress reports whether a key with the given address is present. +func (ks *KeyStore) HasAddress(addr common.Address) bool { + return ks.cache.hasAddress(addr) +} + +// Accounts returns all key files present in the directory. +func (ks *KeyStore) Accounts() []accounts.Account { + return ks.cache.accounts() +} + +// Delete deletes the key matched by account if the passphrase is correct. +// If the account contains no filename, the address must match a unique key. +func (ks *KeyStore) Delete(a accounts.Account, passphrase string) error { + // Decrypting the key isn't really necessary, but we do + // it anyway to check the password and zero out the key + // immediately afterwards. + a, key, err := ks.getDecryptedKey(a, passphrase) + if key != nil { + zeroKey(key.PrivateKey) + } + if err != nil { + return err + } + // The order is crucial here. The key is dropped from the + // cache after the file is gone so that a reload happening in + // between won't insert it into the cache again. + err = os.Remove(a.URL.Path) + if err == nil { + ks.cache.delete(a) + ks.refreshWallets() + } + return err +} + +// SignHash calculates a ECDSA signature for the given hash. The produced +// signature is in the [R || S || V] format where V is 0 or 1. +func (ks *KeyStore) SignHash(a accounts.Account, hash []byte) ([]byte, error) { + // Look up the key to sign with and abort if it cannot be found + ks.mu.RLock() + defer ks.mu.RUnlock() + + unlockedKey, found := ks.unlocked[a.Address] + if !found { + return nil, ErrLocked + } + // Sign the hash using plain ECDSA operations + return crypto.Sign(hash, unlockedKey.PrivateKey) +} + +// SignTx signs the given transaction with the requested account. +func (ks *KeyStore) SignTx(a accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) { + // Look up the key to sign with and abort if it cannot be found + ks.mu.RLock() + defer ks.mu.RUnlock() + + unlockedKey, found := ks.unlocked[a.Address] + if !found { + return nil, ErrLocked + } + // Depending on the presence of the chain ID, sign with EIP155 or homestead + if chainID != nil { + return types.SignTx(tx, types.NewEIP155Signer(chainID), unlockedKey.PrivateKey) + } + return types.SignTx(tx, types.HomesteadSigner{}, unlockedKey.PrivateKey) +} + +// SignHashWithPassphrase signs hash if the private key matching the given address +// can be decrypted with the given passphrase. The produced signature is in the +// [R || S || V] format where V is 0 or 1. +func (ks *KeyStore) SignHashWithPassphrase(a accounts.Account, passphrase string, hash []byte) (signature []byte, err error) { + _, key, err := ks.getDecryptedKey(a, passphrase) + if err != nil { + return nil, err + } + defer zeroKey(key.PrivateKey) + return crypto.Sign(hash, key.PrivateKey) +} + +// SignTxWithPassphrase signs the transaction if the private key matching the +// given address can be decrypted with the given passphrase. +func (ks *KeyStore) SignTxWithPassphrase(a accounts.Account, passphrase string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) { + _, key, err := ks.getDecryptedKey(a, passphrase) + if err != nil { + return nil, err + } + defer zeroKey(key.PrivateKey) + + // Depending on the presence of the chain ID, sign with EIP155 or homestead + if chainID != nil { + return types.SignTx(tx, types.NewEIP155Signer(chainID), key.PrivateKey) + } + return types.SignTx(tx, types.HomesteadSigner{}, key.PrivateKey) +} + +// Unlock unlocks the given account indefinitely. +func (ks *KeyStore) Unlock(a accounts.Account, passphrase string) error { + return ks.TimedUnlock(a, passphrase, 0) +} + +// Lock removes the private key with the given address from memory. +func (ks *KeyStore) Lock(addr common.Address) error { + ks.mu.Lock() + if unl, found := ks.unlocked[addr]; found { + ks.mu.Unlock() + ks.expire(addr, unl, time.Duration(0)*time.Nanosecond) + } else { + ks.mu.Unlock() + } + return nil +} + +// TimedUnlock unlocks the given account with the passphrase. The account +// stays unlocked for the duration of timeout. A timeout of 0 unlocks the account +// until the program exits. The account must match a unique key file. +// +// If the account address is already unlocked for a duration, TimedUnlock extends or +// shortens the active unlock timeout. If the address was previously unlocked +// indefinitely the timeout is not altered. +func (ks *KeyStore) TimedUnlock(a accounts.Account, passphrase string, timeout time.Duration) error { + a, key, err := ks.getDecryptedKey(a, passphrase) + if err != nil { + return err + } + + ks.mu.Lock() + defer ks.mu.Unlock() + u, found := ks.unlocked[a.Address] + if found { + if u.abort == nil { + // The address was unlocked indefinitely, so unlocking + // it with a timeout would be confusing. + zeroKey(key.PrivateKey) + return nil + } + // Terminate the expire goroutine and replace it below. + close(u.abort) + } + if timeout > 0 { + u = &unlocked{Key: key, abort: make(chan struct{})} + go ks.expire(a.Address, u, timeout) + } else { + u = &unlocked{Key: key} + } + ks.unlocked[a.Address] = u + return nil +} + +// Find resolves the given account into a unique entry in the keystore. +func (ks *KeyStore) Find(a accounts.Account) (accounts.Account, error) { + ks.cache.maybeReload() + ks.cache.mu.Lock() + a, err := ks.cache.find(a) + ks.cache.mu.Unlock() + return a, err +} + +func (ks *KeyStore) getDecryptedKey(a accounts.Account, auth string) (accounts.Account, *Key, error) { + a, err := ks.Find(a) + if err != nil { + return a, nil, err + } + key, err := ks.storage.GetKey(a.Address, a.URL.Path, auth) + return a, key, err +} + +func (ks *KeyStore) expire(addr common.Address, u *unlocked, timeout time.Duration) { + t := time.NewTimer(timeout) + defer t.Stop() + select { + case <-u.abort: + // just quit + case <-t.C: + ks.mu.Lock() + // only drop if it's still the same key instance that dropLater + // was launched with. we can check that using pointer equality + // because the map stores a new pointer every time the key is + // unlocked. + if ks.unlocked[addr] == u { + zeroKey(u.PrivateKey) + delete(ks.unlocked, addr) + } + ks.mu.Unlock() + } +} + +// NewAccount generates a new key and stores it into the key directory, +// encrypting it with the passphrase. +func (ks *KeyStore) NewAccount(passphrase string) (accounts.Account, error) { + _, account, err := storeNewKey(ks.storage, crand.Reader, passphrase) + if err != nil { + return accounts.Account{}, err + } + // Add the account to the cache immediately rather + // than waiting for file system notifications to pick it up. + ks.cache.add(account) + ks.refreshWallets() + return account, nil +} + +// Export exports as a JSON key, encrypted with newPassphrase. +func (ks *KeyStore) Export(a accounts.Account, passphrase, newPassphrase string) (keyJSON []byte, err error) { + _, key, err := ks.getDecryptedKey(a, passphrase) + if err != nil { + return nil, err + } + var N, P int + if store, ok := ks.storage.(*keyStorePassphrase); ok { + N, P = store.scryptN, store.scryptP + } else { + N, P = StandardScryptN, StandardScryptP + } + return EncryptKey(key, newPassphrase, N, P) +} + +// Import stores the given encrypted JSON key into the key directory. +func (ks *KeyStore) Import(keyJSON []byte, passphrase, newPassphrase string) (accounts.Account, error) { + key, err := DecryptKey(keyJSON, passphrase) + if key != nil && key.PrivateKey != nil { + defer zeroKey(key.PrivateKey) + } + if err != nil { + return accounts.Account{}, err + } + return ks.importKey(key, newPassphrase) +} + +// ImportECDSA stores the given key into the key directory, encrypting it with the passphrase. +func (ks *KeyStore) ImportECDSA(priv *ecdsa.PrivateKey, passphrase string) (accounts.Account, error) { + key := newKeyFromECDSA(priv) + if ks.cache.hasAddress(key.Address) { + return accounts.Account{}, fmt.Errorf("account already exists") + } + return ks.importKey(key, passphrase) +} + +func (ks *KeyStore) importKey(key *Key, passphrase string) (accounts.Account, error) { + a := accounts.Account{Address: key.Address, URL: accounts.URL{Scheme: KeyStoreScheme, Path: ks.storage.JoinPath(keyFileName(key.Address))}} + if err := ks.storage.StoreKey(a.URL.Path, key, passphrase); err != nil { + return accounts.Account{}, err + } + ks.cache.add(a) + ks.refreshWallets() + return a, nil +} + +// Update changes the passphrase of an existing account. +func (ks *KeyStore) Update(a accounts.Account, passphrase, newPassphrase string) error { + a, key, err := ks.getDecryptedKey(a, passphrase) + if err != nil { + return err + } + return ks.storage.StoreKey(a.URL.Path, key, newPassphrase) +} + +// ImportPreSaleKey decrypts the given Ethereum presale wallet and stores +// a key file in the key directory. The key file is encrypted with the same passphrase. +func (ks *KeyStore) ImportPreSaleKey(keyJSON []byte, passphrase string) (accounts.Account, error) { + a, _, err := importPreSaleKey(ks.storage, keyJSON, passphrase) + if err != nil { + return a, err + } + ks.cache.add(a) + ks.refreshWallets() + return a, nil +} + +// zeroKey zeroes a private key in memory. +func zeroKey(k *ecdsa.PrivateKey) { + b := k.D.Bits() + for i := range b { + b[i] = 0 + } +} diff --git a/accounts/keystore/passphrase.go b/accounts/keystore/passphrase.go new file mode 100644 index 0000000..fa5a09d --- /dev/null +++ b/accounts/keystore/passphrase.go @@ -0,0 +1,356 @@ +// Copyright 2014 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +/* + +This key store behaves as KeyStorePlain with the difference that +the private key is encrypted and on disk uses another JSON encoding. + +The crypto is documented at https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition + +*/ + +package keystore + +import ( + "bytes" + "crypto/aes" + "crypto/rand" + "crypto/sha256" + "encoding/hex" + "encoding/json" + "fmt" + "io" + "io/ioutil" + "os" + "path/filepath" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/common/math" + "github.com/ava-labs/go-ethereum/crypto" + "github.com/pborman/uuid" + "golang.org/x/crypto/pbkdf2" + "golang.org/x/crypto/scrypt" +) + +const ( + keyHeaderKDF = "scrypt" + + // StandardScryptN is the N parameter of Scrypt encryption algorithm, using 256MB + // memory and taking approximately 1s CPU time on a modern processor. + StandardScryptN = 1 << 18 + + // StandardScryptP is the P parameter of Scrypt encryption algorithm, using 256MB + // memory and taking approximately 1s CPU time on a modern processor. + StandardScryptP = 1 + + // LightScryptN is the N parameter of Scrypt encryption algorithm, using 4MB + // memory and taking approximately 100ms CPU time on a modern processor. + LightScryptN = 1 << 12 + + // LightScryptP is the P parameter of Scrypt encryption algorithm, using 4MB + // memory and taking approximately 100ms CPU time on a modern processor. + LightScryptP = 6 + + scryptR = 8 + scryptDKLen = 32 +) + +type keyStorePassphrase struct { + keysDirPath string + scryptN int + scryptP int + // skipKeyFileVerification disables the security-feature which does + // reads and decrypts any newly created keyfiles. This should be 'false' in all + // cases except tests -- setting this to 'true' is not recommended. + skipKeyFileVerification bool +} + +func (ks keyStorePassphrase) GetKey(addr common.Address, filename, auth string) (*Key, error) { + // Load the key from the keystore and decrypt its contents + keyjson, err := ioutil.ReadFile(filename) + if err != nil { + return nil, err + } + key, err := DecryptKey(keyjson, auth) + if err != nil { + return nil, err + } + // Make sure we're really operating on the requested key (no swap attacks) + if key.Address != addr { + return nil, fmt.Errorf("key content mismatch: have account %x, want %x", key.Address, addr) + } + return key, nil +} + +// StoreKey generates a key, encrypts with 'auth' and stores in the given directory +func StoreKey(dir, auth string, scryptN, scryptP int) (accounts.Account, error) { + _, a, err := storeNewKey(&keyStorePassphrase{dir, scryptN, scryptP, false}, rand.Reader, auth) + return a, err +} + +func (ks keyStorePassphrase) StoreKey(filename string, key *Key, auth string) error { + keyjson, err := EncryptKey(key, auth, ks.scryptN, ks.scryptP) + if err != nil { + return err + } + // Write into temporary file + tmpName, err := writeTemporaryKeyFile(filename, keyjson) + if err != nil { + return err + } + if !ks.skipKeyFileVerification { + // Verify that we can decrypt the file with the given password. + _, err = ks.GetKey(key.Address, tmpName, auth) + if err != nil { + msg := "An error was encountered when saving and verifying the keystore file. \n" + + "This indicates that the keystore is corrupted. \n" + + "The corrupted file is stored at \n%v\n" + + "Please file a ticket at:\n\n" + + "https://github.com/ethereum/go-ethereum/issues." + + "The error was : %s" + return fmt.Errorf(msg, tmpName, err) + } + } + return os.Rename(tmpName, filename) +} + +func (ks keyStorePassphrase) JoinPath(filename string) string { + if filepath.IsAbs(filename) { + return filename + } + return filepath.Join(ks.keysDirPath, filename) +} + +// Encryptdata encrypts the data given as 'data' with the password 'auth'. +func EncryptDataV3(data, auth []byte, scryptN, scryptP int) (CryptoJSON, error) { + + salt := make([]byte, 32) + if _, err := io.ReadFull(rand.Reader, salt); err != nil { + panic("reading from crypto/rand failed: " + err.Error()) + } + derivedKey, err := scrypt.Key(auth, salt, scryptN, scryptR, scryptP, scryptDKLen) + if err != nil { + return CryptoJSON{}, err + } + encryptKey := derivedKey[:16] + + iv := make([]byte, aes.BlockSize) // 16 + if _, err := io.ReadFull(rand.Reader, iv); err != nil { + panic("reading from crypto/rand failed: " + err.Error()) + } + cipherText, err := aesCTRXOR(encryptKey, data, iv) + if err != nil { + return CryptoJSON{}, err + } + mac := crypto.Keccak256(derivedKey[16:32], cipherText) + + scryptParamsJSON := make(map[string]interface{}, 5) + scryptParamsJSON["n"] = scryptN + scryptParamsJSON["r"] = scryptR + scryptParamsJSON["p"] = scryptP + scryptParamsJSON["dklen"] = scryptDKLen + scryptParamsJSON["salt"] = hex.EncodeToString(salt) + cipherParamsJSON := cipherparamsJSON{ + IV: hex.EncodeToString(iv), + } + + cryptoStruct := CryptoJSON{ + Cipher: "aes-128-ctr", + CipherText: hex.EncodeToString(cipherText), + CipherParams: cipherParamsJSON, + KDF: keyHeaderKDF, + KDFParams: scryptParamsJSON, + MAC: hex.EncodeToString(mac), + } + return cryptoStruct, nil +} + +// EncryptKey encrypts a key using the specified scrypt parameters into a json +// blob that can be decrypted later on. +func EncryptKey(key *Key, auth string, scryptN, scryptP int) ([]byte, error) { + keyBytes := math.PaddedBigBytes(key.PrivateKey.D, 32) + cryptoStruct, err := EncryptDataV3(keyBytes, []byte(auth), scryptN, scryptP) + if err != nil { + return nil, err + } + encryptedKeyJSONV3 := encryptedKeyJSONV3{ + hex.EncodeToString(key.Address[:]), + cryptoStruct, + key.Id.String(), + version, + } + return json.Marshal(encryptedKeyJSONV3) +} + +// DecryptKey decrypts a key from a json blob, returning the private key itself. +func DecryptKey(keyjson []byte, auth string) (*Key, error) { + // Parse the json into a simple map to fetch the key version + m := make(map[string]interface{}) + if err := json.Unmarshal(keyjson, &m); err != nil { + return nil, err + } + // Depending on the version try to parse one way or another + var ( + keyBytes, keyId []byte + err error + ) + if version, ok := m["version"].(string); ok && version == "1" { + k := new(encryptedKeyJSONV1) + if err := json.Unmarshal(keyjson, k); err != nil { + return nil, err + } + keyBytes, keyId, err = decryptKeyV1(k, auth) + } else { + k := new(encryptedKeyJSONV3) + if err := json.Unmarshal(keyjson, k); err != nil { + return nil, err + } + keyBytes, keyId, err = decryptKeyV3(k, auth) + } + // Handle any decryption errors and return the key + if err != nil { + return nil, err + } + key := crypto.ToECDSAUnsafe(keyBytes) + + return &Key{ + Id: uuid.UUID(keyId), + Address: crypto.PubkeyToAddress(key.PublicKey), + PrivateKey: key, + }, nil +} + +func DecryptDataV3(cryptoJson CryptoJSON, auth string) ([]byte, error) { + if cryptoJson.Cipher != "aes-128-ctr" { + return nil, fmt.Errorf("Cipher not supported: %v", cryptoJson.Cipher) + } + mac, err := hex.DecodeString(cryptoJson.MAC) + if err != nil { + return nil, err + } + + iv, err := hex.DecodeString(cryptoJson.CipherParams.IV) + if err != nil { + return nil, err + } + + cipherText, err := hex.DecodeString(cryptoJson.CipherText) + if err != nil { + return nil, err + } + + derivedKey, err := getKDFKey(cryptoJson, auth) + if err != nil { + return nil, err + } + + calculatedMAC := crypto.Keccak256(derivedKey[16:32], cipherText) + if !bytes.Equal(calculatedMAC, mac) { + return nil, ErrDecrypt + } + + plainText, err := aesCTRXOR(derivedKey[:16], cipherText, iv) + if err != nil { + return nil, err + } + return plainText, err +} + +func decryptKeyV3(keyProtected *encryptedKeyJSONV3, auth string) (keyBytes []byte, keyId []byte, err error) { + if keyProtected.Version != version { + return nil, nil, fmt.Errorf("Version not supported: %v", keyProtected.Version) + } + keyId = uuid.Parse(keyProtected.Id) + plainText, err := DecryptDataV3(keyProtected.Crypto, auth) + if err != nil { + return nil, nil, err + } + return plainText, keyId, err +} + +func decryptKeyV1(keyProtected *encryptedKeyJSONV1, auth string) (keyBytes []byte, keyId []byte, err error) { + keyId = uuid.Parse(keyProtected.Id) + mac, err := hex.DecodeString(keyProtected.Crypto.MAC) + if err != nil { + return nil, nil, err + } + + iv, err := hex.DecodeString(keyProtected.Crypto.CipherParams.IV) + if err != nil { + return nil, nil, err + } + + cipherText, err := hex.DecodeString(keyProtected.Crypto.CipherText) + if err != nil { + return nil, nil, err + } + + derivedKey, err := getKDFKey(keyProtected.Crypto, auth) + if err != nil { + return nil, nil, err + } + + calculatedMAC := crypto.Keccak256(derivedKey[16:32], cipherText) + if !bytes.Equal(calculatedMAC, mac) { + return nil, nil, ErrDecrypt + } + + plainText, err := aesCBCDecrypt(crypto.Keccak256(derivedKey[:16])[:16], cipherText, iv) + if err != nil { + return nil, nil, err + } + return plainText, keyId, err +} + +func getKDFKey(cryptoJSON CryptoJSON, auth string) ([]byte, error) { + authArray := []byte(auth) + salt, err := hex.DecodeString(cryptoJSON.KDFParams["salt"].(string)) + if err != nil { + return nil, err + } + dkLen := ensureInt(cryptoJSON.KDFParams["dklen"]) + + if cryptoJSON.KDF == keyHeaderKDF { + n := ensureInt(cryptoJSON.KDFParams["n"]) + r := ensureInt(cryptoJSON.KDFParams["r"]) + p := ensureInt(cryptoJSON.KDFParams["p"]) + return scrypt.Key(authArray, salt, n, r, p, dkLen) + + } else if cryptoJSON.KDF == "pbkdf2" { + c := ensureInt(cryptoJSON.KDFParams["c"]) + prf := cryptoJSON.KDFParams["prf"].(string) + if prf != "hmac-sha256" { + return nil, fmt.Errorf("Unsupported PBKDF2 PRF: %s", prf) + } + key := pbkdf2.Key(authArray, salt, c, dkLen, sha256.New) + return key, nil + } + + return nil, fmt.Errorf("Unsupported KDF: %s", cryptoJSON.KDF) +} + +// TODO: can we do without this when unmarshalling dynamic JSON? +// why do integers in KDF params end up as float64 and not int after +// unmarshal? +func ensureInt(x interface{}) int { + res, ok := x.(int) + if !ok { + res = int(x.(float64)) + } + return res +} diff --git a/accounts/keystore/plain.go b/accounts/keystore/plain.go new file mode 100644 index 0000000..bc5b377 --- /dev/null +++ b/accounts/keystore/plain.go @@ -0,0 +1,61 @@ +// Copyright 2015 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package keystore + +import ( + "encoding/json" + "fmt" + "os" + "path/filepath" + + "github.com/ava-labs/go-ethereum/common" +) + +type keyStorePlain struct { + keysDirPath string +} + +func (ks keyStorePlain) GetKey(addr common.Address, filename, auth string) (*Key, error) { + fd, err := os.Open(filename) + if err != nil { + return nil, err + } + defer fd.Close() + key := new(Key) + if err := json.NewDecoder(fd).Decode(key); err != nil { + return nil, err + } + if key.Address != addr { + return nil, fmt.Errorf("key content mismatch: have address %x, want %x", key.Address, addr) + } + return key, nil +} + +func (ks keyStorePlain) StoreKey(filename string, key *Key, auth string) error { + content, err := json.Marshal(key) + if err != nil { + return err + } + return writeKeyFile(filename, content) +} + +func (ks keyStorePlain) JoinPath(filename string) string { + if filepath.IsAbs(filename) { + return filename + } + return filepath.Join(ks.keysDirPath, filename) +} diff --git a/accounts/keystore/presale.go b/accounts/keystore/presale.go new file mode 100644 index 0000000..5122b0d --- /dev/null +++ b/accounts/keystore/presale.go @@ -0,0 +1,147 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package keystore + +import ( + "crypto/aes" + "crypto/cipher" + "crypto/sha256" + "encoding/hex" + "encoding/json" + "errors" + "fmt" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/go-ethereum/crypto" + "github.com/pborman/uuid" + "golang.org/x/crypto/pbkdf2" +) + +// creates a Key and stores that in the given KeyStore by decrypting a presale key JSON +func importPreSaleKey(keyStore keyStore, keyJSON []byte, password string) (accounts.Account, *Key, error) { + key, err := decryptPreSaleKey(keyJSON, password) + if err != nil { + return accounts.Account{}, nil, err + } + key.Id = uuid.NewRandom() + a := accounts.Account{ + Address: key.Address, + URL: accounts.URL{ + Scheme: KeyStoreScheme, + Path: keyStore.JoinPath(keyFileName(key.Address)), + }, + } + err = keyStore.StoreKey(a.URL.Path, key, password) + return a, key, err +} + +func decryptPreSaleKey(fileContent []byte, password string) (key *Key, err error) { + preSaleKeyStruct := struct { + EncSeed string + EthAddr string + Email string + BtcAddr string + }{} + err = json.Unmarshal(fileContent, &preSaleKeyStruct) + if err != nil { + return nil, err + } + encSeedBytes, err := hex.DecodeString(preSaleKeyStruct.EncSeed) + if err != nil { + return nil, errors.New("invalid hex in encSeed") + } + if len(encSeedBytes) < 16 { + return nil, errors.New("invalid encSeed, too short") + } + iv := encSeedBytes[:16] + cipherText := encSeedBytes[16:] + /* + See https://github.com/ethereum/pyethsaletool + + pyethsaletool generates the encryption key from password by + 2000 rounds of PBKDF2 with HMAC-SHA-256 using password as salt (:(). + 16 byte key length within PBKDF2 and resulting key is used as AES key + */ + passBytes := []byte(password) + derivedKey := pbkdf2.Key(passBytes, passBytes, 2000, 16, sha256.New) + plainText, err := aesCBCDecrypt(derivedKey, cipherText, iv) + if err != nil { + return nil, err + } + ethPriv := crypto.Keccak256(plainText) + ecKey := crypto.ToECDSAUnsafe(ethPriv) + + key = &Key{ + Id: nil, + Address: crypto.PubkeyToAddress(ecKey.PublicKey), + PrivateKey: ecKey, + } + derivedAddr := hex.EncodeToString(key.Address.Bytes()) // needed because .Hex() gives leading "0x" + expectedAddr := preSaleKeyStruct.EthAddr + if derivedAddr != expectedAddr { + err = fmt.Errorf("decrypted addr '%s' not equal to expected addr '%s'", derivedAddr, expectedAddr) + } + return key, err +} + +func aesCTRXOR(key, inText, iv []byte) ([]byte, error) { + // AES-128 is selected due to size of encryptKey. + aesBlock, err := aes.NewCipher(key) + if err != nil { + return nil, err + } + stream := cipher.NewCTR(aesBlock, iv) + outText := make([]byte, len(inText)) + stream.XORKeyStream(outText, inText) + return outText, err +} + +func aesCBCDecrypt(key, cipherText, iv []byte) ([]byte, error) { + aesBlock, err := aes.NewCipher(key) + if err != nil { + return nil, err + } + decrypter := cipher.NewCBCDecrypter(aesBlock, iv) + paddedPlaintext := make([]byte, len(cipherText)) + decrypter.CryptBlocks(paddedPlaintext, cipherText) + plaintext := pkcs7Unpad(paddedPlaintext) + if plaintext == nil { + return nil, ErrDecrypt + } + return plaintext, err +} + +// From https://leanpub.com/gocrypto/read#leanpub-auto-block-cipher-modes +func pkcs7Unpad(in []byte) []byte { + if len(in) == 0 { + return nil + } + + padding := in[len(in)-1] + if int(padding) > len(in) || padding > aes.BlockSize { + return nil + } else if padding == 0 { + return nil + } + + for i := len(in) - 1; i > len(in)-int(padding)-1; i-- { + if in[i] != padding { + return nil + } + } + return in[:len(in)-int(padding)] +} diff --git a/accounts/keystore/wallet.go b/accounts/keystore/wallet.go new file mode 100644 index 0000000..3be901b --- /dev/null +++ b/accounts/keystore/wallet.go @@ -0,0 +1,148 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package keystore + +import ( + "math/big" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/coreth/core/types" + ethereum "github.com/ava-labs/go-ethereum" + "github.com/ava-labs/go-ethereum/crypto" +) + +// keystoreWallet implements the accounts.Wallet interface for the original +// keystore. +type keystoreWallet struct { + account accounts.Account // Single account contained in this wallet + keystore *KeyStore // Keystore where the account originates from +} + +// URL implements accounts.Wallet, returning the URL of the account within. +func (w *keystoreWallet) URL() accounts.URL { + return w.account.URL +} + +// Status implements accounts.Wallet, returning whether the account held by the +// keystore wallet is unlocked or not. +func (w *keystoreWallet) Status() (string, error) { + w.keystore.mu.RLock() + defer w.keystore.mu.RUnlock() + + if _, ok := w.keystore.unlocked[w.account.Address]; ok { + return "Unlocked", nil + } + return "Locked", nil +} + +// Open implements accounts.Wallet, but is a noop for plain wallets since there +// is no connection or decryption step necessary to access the list of accounts. +func (w *keystoreWallet) Open(passphrase string) error { return nil } + +// Close implements accounts.Wallet, but is a noop for plain wallets since there +// is no meaningful open operation. +func (w *keystoreWallet) Close() error { return nil } + +// Accounts implements accounts.Wallet, returning an account list consisting of +// a single account that the plain kestore wallet contains. +func (w *keystoreWallet) Accounts() []accounts.Account { + return []accounts.Account{w.account} +} + +// Contains implements accounts.Wallet, returning whether a particular account is +// or is not wrapped by this wallet instance. +func (w *keystoreWallet) Contains(account accounts.Account) bool { + return account.Address == w.account.Address && (account.URL == (accounts.URL{}) || account.URL == w.account.URL) +} + +// Derive implements accounts.Wallet, but is a noop for plain wallets since there +// is no notion of hierarchical account derivation for plain keystore accounts. +func (w *keystoreWallet) Derive(path accounts.DerivationPath, pin bool) (accounts.Account, error) { + return accounts.Account{}, accounts.ErrNotSupported +} + +// SelfDerive implements accounts.Wallet, but is a noop for plain wallets since +// there is no notion of hierarchical account derivation for plain keystore accounts. +func (w *keystoreWallet) SelfDerive(bases []accounts.DerivationPath, chain ethereum.ChainStateReader) { +} + +// signHash attempts to sign the given hash with +// the given account. If the wallet does not wrap this particular account, an +// error is returned to avoid account leakage (even though in theory we may be +// able to sign via our shared keystore backend). +func (w *keystoreWallet) signHash(account accounts.Account, hash []byte) ([]byte, error) { + // Make sure the requested account is contained within + if !w.Contains(account) { + return nil, accounts.ErrUnknownAccount + } + // Account seems valid, request the keystore to sign + return w.keystore.SignHash(account, hash) +} + +// SignData signs keccak256(data). The mimetype parameter describes the type of data being signed +func (w *keystoreWallet) SignData(account accounts.Account, mimeType string, data []byte) ([]byte, error) { + return w.signHash(account, crypto.Keccak256(data)) +} + +// SignDataWithPassphrase signs keccak256(data). The mimetype parameter describes the type of data being signed +func (w *keystoreWallet) SignDataWithPassphrase(account accounts.Account, passphrase, mimeType string, data []byte) ([]byte, error) { + // Make sure the requested account is contained within + if !w.Contains(account) { + return nil, accounts.ErrUnknownAccount + } + // Account seems valid, request the keystore to sign + return w.keystore.SignHashWithPassphrase(account, passphrase, crypto.Keccak256(data)) +} + +func (w *keystoreWallet) SignText(account accounts.Account, text []byte) ([]byte, error) { + return w.signHash(account, accounts.TextHash(text)) +} + +// SignTextWithPassphrase implements accounts.Wallet, attempting to sign the +// given hash with the given account using passphrase as extra authentication. +func (w *keystoreWallet) SignTextWithPassphrase(account accounts.Account, passphrase string, text []byte) ([]byte, error) { + // Make sure the requested account is contained within + if !w.Contains(account) { + return nil, accounts.ErrUnknownAccount + } + // Account seems valid, request the keystore to sign + return w.keystore.SignHashWithPassphrase(account, passphrase, accounts.TextHash(text)) +} + +// SignTx implements accounts.Wallet, attempting to sign the given transaction +// with the given account. If the wallet does not wrap this particular account, +// an error is returned to avoid account leakage (even though in theory we may +// be able to sign via our shared keystore backend). +func (w *keystoreWallet) SignTx(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) { + // Make sure the requested account is contained within + if !w.Contains(account) { + return nil, accounts.ErrUnknownAccount + } + // Account seems valid, request the keystore to sign + return w.keystore.SignTx(account, tx, chainID) +} + +// SignTxWithPassphrase implements accounts.Wallet, attempting to sign the given +// transaction with the given account using passphrase as extra authentication. +func (w *keystoreWallet) SignTxWithPassphrase(account accounts.Account, passphrase string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) { + // Make sure the requested account is contained within + if !w.Contains(account) { + return nil, accounts.ErrUnknownAccount + } + // Account seems valid, request the keystore to sign + return w.keystore.SignTxWithPassphrase(account, passphrase, tx, chainID) +} diff --git a/accounts/keystore/watch.go b/accounts/keystore/watch.go new file mode 100644 index 0000000..7fa5b3c --- /dev/null +++ b/accounts/keystore/watch.go @@ -0,0 +1,108 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +// +build darwin,!ios,cgo freebsd linux,!arm64 netbsd solaris + +package keystore + +import ( + "time" + + "github.com/ava-labs/go-ethereum/log" + "github.com/rjeczalik/notify" +) + +type watcher struct { + ac *accountCache + starting bool + running bool + ev chan notify.EventInfo + quit chan struct{} +} + +func newWatcher(ac *accountCache) *watcher { + return &watcher{ + ac: ac, + ev: make(chan notify.EventInfo, 10), + quit: make(chan struct{}), + } +} + +// starts the watcher loop in the background. +// Start a watcher in the background if that's not already in progress. +// The caller must hold w.ac.mu. +func (w *watcher) start() { + if w.starting || w.running { + return + } + w.starting = true + go w.loop() +} + +func (w *watcher) close() { + close(w.quit) +} + +func (w *watcher) loop() { + defer func() { + w.ac.mu.Lock() + w.running = false + w.starting = false + w.ac.mu.Unlock() + }() + logger := log.New("path", w.ac.keydir) + + if err := notify.Watch(w.ac.keydir, w.ev, notify.All); err != nil { + logger.Trace("Failed to watch keystore folder", "err", err) + return + } + defer notify.Stop(w.ev) + logger.Trace("Started watching keystore folder") + defer logger.Trace("Stopped watching keystore folder") + + w.ac.mu.Lock() + w.running = true + w.ac.mu.Unlock() + + // Wait for file system events and reload. + // When an event occurs, the reload call is delayed a bit so that + // multiple events arriving quickly only cause a single reload. + var ( + debounceDuration = 500 * time.Millisecond + rescanTriggered = false + debounce = time.NewTimer(0) + ) + // Ignore initial trigger + if !debounce.Stop() { + <-debounce.C + } + defer debounce.Stop() + for { + select { + case <-w.quit: + return + case <-w.ev: + // Trigger the scan (with delay), if not already triggered + if !rescanTriggered { + debounce.Reset(debounceDuration) + rescanTriggered = true + } + case <-debounce.C: + w.ac.scanAccounts() + rescanTriggered = false + } + } +} diff --git a/accounts/keystore/watch_fallback.go b/accounts/keystore/watch_fallback.go new file mode 100644 index 0000000..de0e87f --- /dev/null +++ b/accounts/keystore/watch_fallback.go @@ -0,0 +1,28 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +// +build darwin,!cgo ios linux,arm64 windows !darwin,!freebsd,!linux,!netbsd,!solaris + +// This is the fallback implementation of directory watching. +// It is used on unsupported platforms. + +package keystore + +type watcher struct{ running bool } + +func newWatcher(*accountCache) *watcher { return new(watcher) } +func (*watcher) start() {} +func (*watcher) close() {} diff --git a/accounts/manager.go b/accounts/manager.go new file mode 100644 index 0000000..39211da --- /dev/null +++ b/accounts/manager.go @@ -0,0 +1,229 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package accounts + +import ( + "reflect" + "sort" + "sync" + + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/event" +) + +// Config contains the settings of the global account manager. +// +// TODO(rjl493456442, karalabe, holiman): Get rid of this when account management +// is removed in favor of Clef. +type Config struct { + InsecureUnlockAllowed bool // Whether account unlocking in insecure environment is allowed +} + +// Manager is an overarching account manager that can communicate with various +// backends for signing transactions. +type Manager struct { + config *Config // Global account manager configurations + backends map[reflect.Type][]Backend // Index of backends currently registered + updaters []event.Subscription // Wallet update subscriptions for all backends + updates chan WalletEvent // Subscription sink for backend wallet changes + wallets []Wallet // Cache of all wallets from all registered backends + + feed event.Feed // Wallet feed notifying of arrivals/departures + + quit chan chan error + lock sync.RWMutex +} + +// NewManager creates a generic account manager to sign transaction via various +// supported backends. +func NewManager(config *Config, backends ...Backend) *Manager { + // Retrieve the initial list of wallets from the backends and sort by URL + var wallets []Wallet + for _, backend := range backends { + wallets = merge(wallets, backend.Wallets()...) + } + // Subscribe to wallet notifications from all backends + updates := make(chan WalletEvent, 4*len(backends)) + + subs := make([]event.Subscription, len(backends)) + for i, backend := range backends { + subs[i] = backend.Subscribe(updates) + } + // Assemble the account manager and return + am := &Manager{ + config: config, + backends: make(map[reflect.Type][]Backend), + updaters: subs, + updates: updates, + wallets: wallets, + quit: make(chan chan error), + } + for _, backend := range backends { + kind := reflect.TypeOf(backend) + am.backends[kind] = append(am.backends[kind], backend) + } + go am.update() + + return am +} + +// Close terminates the account manager's internal notification processes. +func (am *Manager) Close() error { + errc := make(chan error) + am.quit <- errc + return <-errc +} + +// Config returns the configuration of account manager. +func (am *Manager) Config() *Config { + return am.config +} + +// update is the wallet event loop listening for notifications from the backends +// and updating the cache of wallets. +func (am *Manager) update() { + // Close all subscriptions when the manager terminates + defer func() { + am.lock.Lock() + for _, sub := range am.updaters { + sub.Unsubscribe() + } + am.updaters = nil + am.lock.Unlock() + }() + + // Loop until termination + for { + select { + case event := <-am.updates: + // Wallet event arrived, update local cache + am.lock.Lock() + switch event.Kind { + case WalletArrived: + am.wallets = merge(am.wallets, event.Wallet) + case WalletDropped: + am.wallets = drop(am.wallets, event.Wallet) + } + am.lock.Unlock() + + // Notify any listeners of the event + am.feed.Send(event) + + case errc := <-am.quit: + // Manager terminating, return + errc <- nil + return + } + } +} + +// Backends retrieves the backend(s) with the given type from the account manager. +func (am *Manager) Backends(kind reflect.Type) []Backend { + return am.backends[kind] +} + +// Wallets returns all signer accounts registered under this account manager. +func (am *Manager) Wallets() []Wallet { + am.lock.RLock() + defer am.lock.RUnlock() + + cpy := make([]Wallet, len(am.wallets)) + copy(cpy, am.wallets) + return cpy +} + +// Wallet retrieves the wallet associated with a particular URL. +func (am *Manager) Wallet(url string) (Wallet, error) { + am.lock.RLock() + defer am.lock.RUnlock() + + parsed, err := parseURL(url) + if err != nil { + return nil, err + } + for _, wallet := range am.Wallets() { + if wallet.URL() == parsed { + return wallet, nil + } + } + return nil, ErrUnknownWallet +} + +// Accounts returns all account addresses of all wallets within the account manager +func (am *Manager) Accounts() []common.Address { + am.lock.RLock() + defer am.lock.RUnlock() + + addresses := make([]common.Address, 0) // return [] instead of nil if empty + for _, wallet := range am.wallets { + for _, account := range wallet.Accounts() { + addresses = append(addresses, account.Address) + } + } + return addresses +} + +// Find attempts to locate the wallet corresponding to a specific account. Since +// accounts can be dynamically added to and removed from wallets, this method has +// a linear runtime in the number of wallets. +func (am *Manager) Find(account Account) (Wallet, error) { + am.lock.RLock() + defer am.lock.RUnlock() + + for _, wallet := range am.wallets { + if wallet.Contains(account) { + return wallet, nil + } + } + return nil, ErrUnknownAccount +} + +// Subscribe creates an async subscription to receive notifications when the +// manager detects the arrival or departure of a wallet from any of its backends. +func (am *Manager) Subscribe(sink chan<- WalletEvent) event.Subscription { + return am.feed.Subscribe(sink) +} + +// merge is a sorted analogue of append for wallets, where the ordering of the +// origin list is preserved by inserting new wallets at the correct position. +// +// The original slice is assumed to be already sorted by URL. +func merge(slice []Wallet, wallets ...Wallet) []Wallet { + for _, wallet := range wallets { + n := sort.Search(len(slice), func(i int) bool { return slice[i].URL().Cmp(wallet.URL()) >= 0 }) + if n == len(slice) { + slice = append(slice, wallet) + continue + } + slice = append(slice[:n], append([]Wallet{wallet}, slice[n:]...)...) + } + return slice +} + +// drop is the couterpart of merge, which looks up wallets from within the sorted +// cache and removes the ones specified. +func drop(slice []Wallet, wallets ...Wallet) []Wallet { + for _, wallet := range wallets { + n := sort.Search(len(slice), func(i int) bool { return slice[i].URL().Cmp(wallet.URL()) >= 0 }) + if n == len(slice) { + // Wallet not found, may happen during startup + continue + } + slice = append(slice[:n], slice[n+1:]...) + } + return slice +} diff --git a/accounts/scwallet/README.md b/accounts/scwallet/README.md new file mode 100644 index 0000000..cfca916 --- /dev/null +++ b/accounts/scwallet/README.md @@ -0,0 +1,102 @@ +# Using the smartcard wallet + +## Requirements + + * A USB smartcard reader + * A keycard that supports the status app + * PCSCD version 4.3 running on your system **Only version 4.3 is currently supported** + +## Preparing the smartcard + + **WARNING: FOILLOWING THESE INSTRUCTIONS WILL DESTROY THE MASTER KEY ON YOUR CARD. ONLY PROCEED IF NO FUNDS ARE ASSOCIATED WITH THESE ACCOUNTS** + + You can use status' [keycard-cli](https://github.com/status-im/keycard-cli) and you should get _at least_ version 2.1.1 of their [smartcard application](https://github.com/status-im/status-keycard/releases/download/2.2.1/keycard_v2.2.1.cap) + + You also need to make sure that the PCSC daemon is running on your system. + + Then, you can install the application to the card by typing: + + ``` + keycard install -a keycard_v2.2.1.cap && keycard init + ``` + + At the end of this process, you will be provided with a PIN, a PUK and a pairing password. Write them down, you'll need them shortly. + + Start `geth` with the `console` command. You will notice the following warning: + + ``` + WARN [04-09|16:58:38.898] Failed to open wallet url=keycard://044def09 err="smartcard: pairing password needed" + ``` + + Write down the URL (`keycard://044def09` in this example). Then ask `geth` to open the wallet: + + ``` + > personal.openWallet("keycard://044def09") + Please enter the pairing password: + ``` + + Enter the pairing password that you have received during card initialization. Same with the PIN that you will subsequently be + asked for. + + If everything goes well, you should see your new account when typing `personal` on the console: + + ``` + > personal + WARN [04-09|17:02:07.330] Smartcard wallet account derivation failed url=keycard://044def09 err="Unexpected response status Cla=0x80, Ins=0xd1, Sw=0x6985" + { + listAccounts: [], + listWallets: [{ + status: "Empty, waiting for initialization", + url: "keycard://044def09" + }], + ... + } + ``` + + So the communication with the card is working, but there is no key associated with this wallet. Let's create it: + + ``` + > personal.initializeWallet("keycard://044def09") + "tilt ... impact" + ``` + + You should get a list of words, this is your seed so write them down. Your wallet should now be initialized: + + ``` + > personal.listWallets + [{ + accounts: [{ + address: "0x678b7cd55c61917defb23546a41803c5bfefbc7a", + url: "keycard://044d/m/44'/60'/0'/0/0" + }], + status: "Online", + url: "keycard://044def09" + }] + ``` + + You're all set! + +## Usage + + 1. Start `geth` with the `console` command + 2. Check the card's URL by checking `personal.listWallets`: + +``` + listWallets: [{ + status: "Online, can derive public keys", + url: "keycard://a4d73015" + }] +``` + + 3. Open the wallet, you will be prompted for your pairing password, then PIN: + +``` +personal.openWallet("keycard://a4d73015") +``` + + 4. Check that creation was successful by typing e.g. `personal`. Then use it like a regular wallet. + +## Known issues + + * Starting geth with a valid card seems to make firefox crash. + * PCSC version 4.4 should work, but is currently untested diff --git a/accounts/scwallet/apdu.go b/accounts/scwallet/apdu.go new file mode 100644 index 0000000..bd36606 --- /dev/null +++ b/accounts/scwallet/apdu.go @@ -0,0 +1,87 @@ +// Copyright 2018 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package scwallet + +import ( + "bytes" + "encoding/binary" + "fmt" +) + +// commandAPDU represents an application data unit sent to a smartcard. +type commandAPDU struct { + Cla, Ins, P1, P2 uint8 // Class, Instruction, Parameter 1, Parameter 2 + Data []byte // Command data + Le uint8 // Command data length +} + +// serialize serializes a command APDU. +func (ca commandAPDU) serialize() ([]byte, error) { + buf := new(bytes.Buffer) + + if err := binary.Write(buf, binary.BigEndian, ca.Cla); err != nil { + return nil, err + } + if err := binary.Write(buf, binary.BigEndian, ca.Ins); err != nil { + return nil, err + } + if err := binary.Write(buf, binary.BigEndian, ca.P1); err != nil { + return nil, err + } + if err := binary.Write(buf, binary.BigEndian, ca.P2); err != nil { + return nil, err + } + if len(ca.Data) > 0 { + if err := binary.Write(buf, binary.BigEndian, uint8(len(ca.Data))); err != nil { + return nil, err + } + if err := binary.Write(buf, binary.BigEndian, ca.Data); err != nil { + return nil, err + } + } + if err := binary.Write(buf, binary.BigEndian, ca.Le); err != nil { + return nil, err + } + return buf.Bytes(), nil +} + +// responseAPDU represents an application data unit received from a smart card. +type responseAPDU struct { + Data []byte // response data + Sw1, Sw2 uint8 // status words 1 and 2 +} + +// deserialize deserializes a response APDU. +func (ra *responseAPDU) deserialize(data []byte) error { + if len(data) < 2 { + return fmt.Errorf("can not deserialize data: payload too short (%d < 2)", len(data)) + } + + ra.Data = make([]byte, len(data)-2) + + buf := bytes.NewReader(data) + if err := binary.Read(buf, binary.BigEndian, &ra.Data); err != nil { + return err + } + if err := binary.Read(buf, binary.BigEndian, &ra.Sw1); err != nil { + return err + } + if err := binary.Read(buf, binary.BigEndian, &ra.Sw2); err != nil { + return err + } + return nil +} diff --git a/accounts/scwallet/hub.go b/accounts/scwallet/hub.go new file mode 100644 index 0000000..ceb422c --- /dev/null +++ b/accounts/scwallet/hub.go @@ -0,0 +1,302 @@ +// Copyright 2018 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +// This package implements support for smartcard-based hardware wallets such as +// the one written by Status: https://github.com/status-im/hardware-wallet +// +// This implementation of smartcard wallets have a different interaction process +// to other types of hardware wallet. The process works like this: +// +// 1. (First use with a given client) Establish a pairing between hardware +// wallet and client. This requires a secret value called a 'pairing password'. +// You can pair with an unpaired wallet with `personal.openWallet(URI, pairing password)`. +// 2. (First use only) Initialize the wallet, which generates a keypair, stores +// it on the wallet, and returns it so the user can back it up. You can +// initialize a wallet with `personal.initializeWallet(URI)`. +// 3. Connect to the wallet using the pairing information established in step 1. +// You can connect to a paired wallet with `personal.openWallet(URI, PIN)`. +// 4. Interact with the wallet as normal. + +package scwallet + +import ( + "encoding/json" + "io/ioutil" + "os" + "path/filepath" + "sort" + "sync" + "time" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/event" + "github.com/ava-labs/go-ethereum/log" + pcsc "github.com/gballet/go-libpcsclite" +) + +// Scheme is the URI prefix for smartcard wallets. +const Scheme = "keycard" + +// refreshCycle is the maximum time between wallet refreshes (if USB hotplug +// notifications don't work). +const refreshCycle = time.Second + +// refreshThrottling is the minimum time between wallet refreshes to avoid thrashing. +const refreshThrottling = 500 * time.Millisecond + +// smartcardPairing contains information about a smart card we have paired with +// or might pair with the hub. +type smartcardPairing struct { + PublicKey []byte `json:"publicKey"` + PairingIndex uint8 `json:"pairingIndex"` + PairingKey []byte `json:"pairingKey"` + Accounts map[common.Address]accounts.DerivationPath `json:"accounts"` +} + +// Hub is a accounts.Backend that can find and handle generic PC/SC hardware wallets. +type Hub struct { + scheme string // Protocol scheme prefixing account and wallet URLs. + + context *pcsc.Client + datadir string + pairings map[string]smartcardPairing + + refreshed time.Time // Time instance when the list of wallets was last refreshed + wallets map[string]*Wallet // Mapping from reader names to wallet instances + updateFeed event.Feed // Event feed to notify wallet additions/removals + updateScope event.SubscriptionScope // Subscription scope tracking current live listeners + updating bool // Whether the event notification loop is running + + quit chan chan error + + stateLock sync.RWMutex // Protects the internals of the hub from racey access +} + +func (hub *Hub) readPairings() error { + hub.pairings = make(map[string]smartcardPairing) + pairingFile, err := os.Open(filepath.Join(hub.datadir, "smartcards.json")) + if err != nil { + if os.IsNotExist(err) { + return nil + } + return err + } + + pairingData, err := ioutil.ReadAll(pairingFile) + if err != nil { + return err + } + var pairings []smartcardPairing + if err := json.Unmarshal(pairingData, &pairings); err != nil { + return err + } + + for _, pairing := range pairings { + hub.pairings[string(pairing.PublicKey)] = pairing + } + return nil +} + +func (hub *Hub) writePairings() error { + pairingFile, err := os.OpenFile(filepath.Join(hub.datadir, "smartcards.json"), os.O_RDWR|os.O_CREATE, 0755) + if err != nil { + return err + } + defer pairingFile.Close() + + pairings := make([]smartcardPairing, 0, len(hub.pairings)) + for _, pairing := range hub.pairings { + pairings = append(pairings, pairing) + } + + pairingData, err := json.Marshal(pairings) + if err != nil { + return err + } + + if _, err := pairingFile.Write(pairingData); err != nil { + return err + } + + return nil +} + +func (hub *Hub) pairing(wallet *Wallet) *smartcardPairing { + if pairing, ok := hub.pairings[string(wallet.PublicKey)]; ok { + return &pairing + } + return nil +} + +func (hub *Hub) setPairing(wallet *Wallet, pairing *smartcardPairing) error { + if pairing == nil { + delete(hub.pairings, string(wallet.PublicKey)) + } else { + hub.pairings[string(wallet.PublicKey)] = *pairing + } + return hub.writePairings() +} + +// NewHub creates a new hardware wallet manager for smartcards. +func NewHub(daemonPath string, scheme string, datadir string) (*Hub, error) { + context, err := pcsc.EstablishContext(daemonPath, pcsc.ScopeSystem) + if err != nil { + return nil, err + } + hub := &Hub{ + scheme: scheme, + context: context, + datadir: datadir, + wallets: make(map[string]*Wallet), + quit: make(chan chan error), + } + if err := hub.readPairings(); err != nil { + return nil, err + } + hub.refreshWallets() + return hub, nil +} + +// Wallets implements accounts.Backend, returning all the currently tracked smart +// cards that appear to be hardware wallets. +func (hub *Hub) Wallets() []accounts.Wallet { + // Make sure the list of wallets is up to date + hub.refreshWallets() + + hub.stateLock.RLock() + defer hub.stateLock.RUnlock() + + cpy := make([]accounts.Wallet, 0, len(hub.wallets)) + for _, wallet := range hub.wallets { + cpy = append(cpy, wallet) + } + sort.Sort(accounts.WalletsByURL(cpy)) + return cpy +} + +// refreshWallets scans the devices attached to the machine and updates the +// list of wallets based on the found devices. +func (hub *Hub) refreshWallets() { + // Don't scan the USB like crazy it the user fetches wallets in a loop + hub.stateLock.RLock() + elapsed := time.Since(hub.refreshed) + hub.stateLock.RUnlock() + + if elapsed < refreshThrottling { + return + } + // Retrieve all the smart card reader to check for cards + readers, err := hub.context.ListReaders() + if err != nil { + // This is a perverted hack, the scard library returns an error if no card + // readers are present instead of simply returning an empty list. We don't + // want to fill the user's log with errors, so filter those out. + if err.Error() != "scard: Cannot find a smart card reader." { + log.Error("Failed to enumerate smart card readers", "err", err) + return + } + } + // Transform the current list of wallets into the new one + hub.stateLock.Lock() + + events := []accounts.WalletEvent{} + seen := make(map[string]struct{}) + + for _, reader := range readers { + // Mark the reader as present + seen[reader] = struct{}{} + + // If we alreay know about this card, skip to the next reader, otherwise clean up + if wallet, ok := hub.wallets[reader]; ok { + if err := wallet.ping(); err == nil { + continue + } + wallet.Close() + events = append(events, accounts.WalletEvent{Wallet: wallet, Kind: accounts.WalletDropped}) + delete(hub.wallets, reader) + } + // New card detected, try to connect to it + card, err := hub.context.Connect(reader, pcsc.ShareShared, pcsc.ProtocolAny) + if err != nil { + log.Debug("Failed to open smart card", "reader", reader, "err", err) + continue + } + wallet := NewWallet(hub, card) + if err = wallet.connect(); err != nil { + log.Debug("Failed to connect to smart card", "reader", reader, "err", err) + card.Disconnect(pcsc.LeaveCard) + continue + } + // Card connected, start tracking in amongs the wallets + hub.wallets[reader] = wallet + events = append(events, accounts.WalletEvent{Wallet: wallet, Kind: accounts.WalletArrived}) + } + // Remove any wallets no longer present + for reader, wallet := range hub.wallets { + if _, ok := seen[reader]; !ok { + wallet.Close() + events = append(events, accounts.WalletEvent{Wallet: wallet, Kind: accounts.WalletDropped}) + delete(hub.wallets, reader) + } + } + hub.refreshed = time.Now() + hub.stateLock.Unlock() + + for _, event := range events { + hub.updateFeed.Send(event) + } +} + +// Subscribe implements accounts.Backend, creating an async subscription to +// receive notifications on the addition or removal of smart card wallets. +func (hub *Hub) Subscribe(sink chan<- accounts.WalletEvent) event.Subscription { + // We need the mutex to reliably start/stop the update loop + hub.stateLock.Lock() + defer hub.stateLock.Unlock() + + // Subscribe the caller and track the subscriber count + sub := hub.updateScope.Track(hub.updateFeed.Subscribe(sink)) + + // Subscribers require an active notification loop, start it + if !hub.updating { + hub.updating = true + go hub.updater() + } + return sub +} + +// updater is responsible for maintaining an up-to-date list of wallets managed +// by the smart card hub, and for firing wallet addition/removal events. +func (hub *Hub) updater() { + for { + // TODO: Wait for a USB hotplug event (not supported yet) or a refresh timeout + // <-hub.changes + time.Sleep(refreshCycle) + + // Run the wallet refresher + hub.refreshWallets() + + // If all our subscribers left, stop the updater + hub.stateLock.Lock() + if hub.updateScope.Count() == 0 { + hub.updating = false + hub.stateLock.Unlock() + return + } + hub.stateLock.Unlock() + } +} diff --git a/accounts/scwallet/securechannel.go b/accounts/scwallet/securechannel.go new file mode 100644 index 0000000..c1b7cff --- /dev/null +++ b/accounts/scwallet/securechannel.go @@ -0,0 +1,346 @@ +// Copyright 2018 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package scwallet + +import ( + "bytes" + "crypto/aes" + "crypto/cipher" + "crypto/rand" + "crypto/sha256" + "crypto/sha512" + "fmt" + + "github.com/ava-labs/go-ethereum/crypto" + pcsc "github.com/gballet/go-libpcsclite" + "github.com/wsddn/go-ecdh" + "golang.org/x/crypto/pbkdf2" + "golang.org/x/text/unicode/norm" +) + +const ( + maxPayloadSize = 223 + pairP1FirstStep = 0 + pairP1LastStep = 1 + + scSecretLength = 32 + scBlockSize = 16 + + insOpenSecureChannel = 0x10 + insMutuallyAuthenticate = 0x11 + insPair = 0x12 + insUnpair = 0x13 + + pairingSalt = "Keycard Pairing Password Salt" +) + +// SecureChannelSession enables secure communication with a hardware wallet. +type SecureChannelSession struct { + card *pcsc.Card // A handle to the smartcard for communication + secret []byte // A shared secret generated from our ECDSA keys + publicKey []byte // Our own ephemeral public key + PairingKey []byte // A permanent shared secret for a pairing, if present + sessionEncKey []byte // The current session encryption key + sessionMacKey []byte // The current session MAC key + iv []byte // The current IV + PairingIndex uint8 // The pairing index +} + +// NewSecureChannelSession creates a new secure channel for the given card and public key. +func NewSecureChannelSession(card *pcsc.Card, keyData []byte) (*SecureChannelSession, error) { + // Generate an ECDSA keypair for ourselves + gen := ecdh.NewEllipticECDH(crypto.S256()) + private, public, err := gen.GenerateKey(rand.Reader) + if err != nil { + return nil, err + } + + cardPublic, ok := gen.Unmarshal(keyData) + if !ok { + return nil, fmt.Errorf("Could not unmarshal public key from card") + } + + secret, err := gen.GenerateSharedSecret(private, cardPublic) + if err != nil { + return nil, err + } + + return &SecureChannelSession{ + card: card, + secret: secret, + publicKey: gen.Marshal(public), + }, nil +} + +// Pair establishes a new pairing with the smartcard. +func (s *SecureChannelSession) Pair(pairingPassword []byte) error { + secretHash := pbkdf2.Key(norm.NFKD.Bytes(pairingPassword), norm.NFKD.Bytes([]byte(pairingSalt)), 50000, 32, sha256.New) + + challenge := make([]byte, 32) + if _, err := rand.Read(challenge); err != nil { + return err + } + + response, err := s.pair(pairP1FirstStep, challenge) + if err != nil { + return err + } + + md := sha256.New() + md.Write(secretHash[:]) + md.Write(challenge) + + expectedCryptogram := md.Sum(nil) + cardCryptogram := response.Data[:32] + cardChallenge := response.Data[32:64] + + if !bytes.Equal(expectedCryptogram, cardCryptogram) { + return fmt.Errorf("Invalid card cryptogram %v != %v", expectedCryptogram, cardCryptogram) + } + + md.Reset() + md.Write(secretHash[:]) + md.Write(cardChallenge) + response, err = s.pair(pairP1LastStep, md.Sum(nil)) + if err != nil { + return err + } + + md.Reset() + md.Write(secretHash[:]) + md.Write(response.Data[1:]) + s.PairingKey = md.Sum(nil) + s.PairingIndex = response.Data[0] + + return nil +} + +// Unpair disestablishes an existing pairing. +func (s *SecureChannelSession) Unpair() error { + if s.PairingKey == nil { + return fmt.Errorf("Cannot unpair: not paired") + } + + _, err := s.transmitEncrypted(claSCWallet, insUnpair, s.PairingIndex, 0, []byte{}) + if err != nil { + return err + } + s.PairingKey = nil + // Close channel + s.iv = nil + return nil +} + +// Open initializes the secure channel. +func (s *SecureChannelSession) Open() error { + if s.iv != nil { + return fmt.Errorf("Session already opened") + } + + response, err := s.open() + if err != nil { + return err + } + + // Generate the encryption/mac key by hashing our shared secret, + // pairing key, and the first bytes returned from the Open APDU. + md := sha512.New() + md.Write(s.secret) + md.Write(s.PairingKey) + md.Write(response.Data[:scSecretLength]) + keyData := md.Sum(nil) + s.sessionEncKey = keyData[:scSecretLength] + s.sessionMacKey = keyData[scSecretLength : scSecretLength*2] + + // The IV is the last bytes returned from the Open APDU. + s.iv = response.Data[scSecretLength:] + + return s.mutuallyAuthenticate() +} + +// mutuallyAuthenticate is an internal method to authenticate both ends of the +// connection. +func (s *SecureChannelSession) mutuallyAuthenticate() error { + data := make([]byte, scSecretLength) + if _, err := rand.Read(data); err != nil { + return err + } + + response, err := s.transmitEncrypted(claSCWallet, insMutuallyAuthenticate, 0, 0, data) + if err != nil { + return err + } + if response.Sw1 != 0x90 || response.Sw2 != 0x00 { + return fmt.Errorf("Got unexpected response from MUTUALLY_AUTHENTICATE: 0x%x%x", response.Sw1, response.Sw2) + } + + if len(response.Data) != scSecretLength { + return fmt.Errorf("Response from MUTUALLY_AUTHENTICATE was %d bytes, expected %d", len(response.Data), scSecretLength) + } + + return nil +} + +// open is an internal method that sends an open APDU. +func (s *SecureChannelSession) open() (*responseAPDU, error) { + return transmit(s.card, &commandAPDU{ + Cla: claSCWallet, + Ins: insOpenSecureChannel, + P1: s.PairingIndex, + P2: 0, + Data: s.publicKey, + Le: 0, + }) +} + +// pair is an internal method that sends a pair APDU. +func (s *SecureChannelSession) pair(p1 uint8, data []byte) (*responseAPDU, error) { + return transmit(s.card, &commandAPDU{ + Cla: claSCWallet, + Ins: insPair, + P1: p1, + P2: 0, + Data: data, + Le: 0, + }) +} + +// transmitEncrypted sends an encrypted message, and decrypts and returns the response. +func (s *SecureChannelSession) transmitEncrypted(cla, ins, p1, p2 byte, data []byte) (*responseAPDU, error) { + if s.iv == nil { + return nil, fmt.Errorf("Channel not open") + } + + data, err := s.encryptAPDU(data) + if err != nil { + return nil, err + } + meta := [16]byte{cla, ins, p1, p2, byte(len(data) + scBlockSize)} + if err = s.updateIV(meta[:], data); err != nil { + return nil, err + } + + fulldata := make([]byte, len(s.iv)+len(data)) + copy(fulldata, s.iv) + copy(fulldata[len(s.iv):], data) + + response, err := transmit(s.card, &commandAPDU{ + Cla: cla, + Ins: ins, + P1: p1, + P2: p2, + Data: fulldata, + }) + if err != nil { + return nil, err + } + + rmeta := [16]byte{byte(len(response.Data))} + rmac := response.Data[:len(s.iv)] + rdata := response.Data[len(s.iv):] + plainData, err := s.decryptAPDU(rdata) + if err != nil { + return nil, err + } + + if err = s.updateIV(rmeta[:], rdata); err != nil { + return nil, err + } + if !bytes.Equal(s.iv, rmac) { + return nil, fmt.Errorf("Invalid MAC in response") + } + + rapdu := &responseAPDU{} + rapdu.deserialize(plainData) + + if rapdu.Sw1 != sw1Ok { + return nil, fmt.Errorf("Unexpected response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", cla, ins, rapdu.Sw1, rapdu.Sw2) + } + + return rapdu, nil +} + +// encryptAPDU is an internal method that serializes and encrypts an APDU. +func (s *SecureChannelSession) encryptAPDU(data []byte) ([]byte, error) { + if len(data) > maxPayloadSize { + return nil, fmt.Errorf("Payload of %d bytes exceeds maximum of %d", len(data), maxPayloadSize) + } + data = pad(data, 0x80) + + ret := make([]byte, len(data)) + + a, err := aes.NewCipher(s.sessionEncKey) + if err != nil { + return nil, err + } + crypter := cipher.NewCBCEncrypter(a, s.iv) + crypter.CryptBlocks(ret, data) + return ret, nil +} + +// pad applies message padding to a 16 byte boundary. +func pad(data []byte, terminator byte) []byte { + padded := make([]byte, (len(data)/16+1)*16) + copy(padded, data) + padded[len(data)] = terminator + return padded +} + +// decryptAPDU is an internal method that decrypts and deserializes an APDU. +func (s *SecureChannelSession) decryptAPDU(data []byte) ([]byte, error) { + a, err := aes.NewCipher(s.sessionEncKey) + if err != nil { + return nil, err + } + + ret := make([]byte, len(data)) + + crypter := cipher.NewCBCDecrypter(a, s.iv) + crypter.CryptBlocks(ret, data) + return unpad(ret, 0x80) +} + +// unpad strips padding from a message. +func unpad(data []byte, terminator byte) ([]byte, error) { + for i := 1; i <= 16; i++ { + switch data[len(data)-i] { + case 0: + continue + case terminator: + return data[:len(data)-i], nil + default: + return nil, fmt.Errorf("Expected end of padding, got %d", data[len(data)-i]) + } + } + return nil, fmt.Errorf("Expected end of padding, got 0") +} + +// updateIV is an internal method that updates the initialization vector after +// each message exchanged. +func (s *SecureChannelSession) updateIV(meta, data []byte) error { + data = pad(data, 0) + a, err := aes.NewCipher(s.sessionMacKey) + if err != nil { + return err + } + crypter := cipher.NewCBCEncrypter(a, make([]byte, 16)) + crypter.CryptBlocks(meta, meta) + crypter.CryptBlocks(data, data) + // The first 16 bytes of the last block is the MAC + s.iv = data[len(data)-32 : len(data)-16] + return nil +} diff --git a/accounts/scwallet/wallet.go b/accounts/scwallet/wallet.go new file mode 100644 index 0000000..f72e685 --- /dev/null +++ b/accounts/scwallet/wallet.go @@ -0,0 +1,1082 @@ +// Copyright 2018 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package scwallet + +import ( + "bytes" + "context" + "crypto/hmac" + "crypto/sha256" + "crypto/sha512" + "encoding/asn1" + "encoding/binary" + "errors" + "fmt" + "math/big" + "regexp" + "sort" + "strings" + "sync" + "time" + + "github.com/ava-labs/coreth/accounts" + "github.com/ava-labs/coreth/core/types" + ethereum "github.com/ava-labs/go-ethereum" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/go-ethereum/crypto" + "github.com/ava-labs/go-ethereum/log" + pcsc "github.com/gballet/go-libpcsclite" + "github.com/status-im/keycard-go/derivationpath" +) + +// ErrPairingPasswordNeeded is returned if opening the smart card requires pairing with a pairing +// password. In this case, the calling application should request user input to enter +// the pairing password and send it back. +var ErrPairingPasswordNeeded = errors.New("smartcard: pairing password needed") + +// ErrPINNeeded is returned if opening the smart card requires a PIN code. In +// this case, the calling application should request user input to enter the PIN +// and send it back. +var ErrPINNeeded = errors.New("smartcard: pin needed") + +// ErrPINUnblockNeeded is returned if opening the smart card requires a PIN code, +// but all PIN attempts have already been exhausted. In this case the calling +// application should request user input for the PUK and a new PIN code to set +// fo the card. +var ErrPINUnblockNeeded = errors.New("smartcard: pin unblock needed") + +// ErrAlreadyOpen is returned if the smart card is attempted to be opened, but +// there is already a paired and unlocked session. +var ErrAlreadyOpen = errors.New("smartcard: already open") + +// ErrPubkeyMismatch is returned if the public key recovered from a signature +// does not match the one expected by the user. +var ErrPubkeyMismatch = errors.New("smartcard: recovered public key mismatch") + +var ( + appletAID = []byte{0xA0, 0x00, 0x00, 0x08, 0x04, 0x00, 0x01, 0x01, 0x01} + // DerivationSignatureHash is used to derive the public key from the signature of this hash + DerivationSignatureHash = sha256.Sum256(common.Hash{}.Bytes()) +) + +// List of APDU command-related constants +const ( + claISO7816 = 0 + claSCWallet = 0x80 + + insSelect = 0xA4 + insGetResponse = 0xC0 + sw1GetResponse = 0x61 + sw1Ok = 0x90 + + insVerifyPin = 0x20 + insUnblockPin = 0x22 + insExportKey = 0xC2 + insSign = 0xC0 + insLoadKey = 0xD0 + insDeriveKey = 0xD1 + insStatus = 0xF2 +) + +// List of ADPU command parameters +const ( + P1DeriveKeyFromMaster = uint8(0x00) + P1DeriveKeyFromParent = uint8(0x01) + P1DeriveKeyFromCurrent = uint8(0x10) + statusP1WalletStatus = uint8(0x00) + statusP1Path = uint8(0x01) + signP1PrecomputedHash = uint8(0x01) + signP2OnlyBlock = uint8(0x81) + exportP1Any = uint8(0x00) + exportP2Pubkey = uint8(0x01) +) + +// Minimum time to wait between self derivation attempts, even it the user is +// requesting accounts like crazy. +const selfDeriveThrottling = time.Second + +// Wallet represents a smartcard wallet instance. +type Wallet struct { + Hub *Hub // A handle to the Hub that instantiated this wallet. + PublicKey []byte // The wallet's public key (used for communication and identification, not signing!) + + lock sync.Mutex // Lock that gates access to struct fields and communication with the card + card *pcsc.Card // A handle to the smartcard interface for the wallet. + session *Session // The secure communication session with the card + log log.Logger // Contextual logger to tag the base with its id + + deriveNextPaths []accounts.DerivationPath // Next derivation paths for account auto-discovery (multiple bases supported) + deriveNextAddrs []common.Address // Next derived account addresses for auto-discovery (multiple bases supported) + deriveChain ethereum.ChainStateReader // Blockchain state reader to discover used account with + deriveReq chan chan struct{} // Channel to request a self-derivation on + deriveQuit chan chan error // Channel to terminate the self-deriver with +} + +// NewWallet constructs and returns a new Wallet instance. +func NewWallet(hub *Hub, card *pcsc.Card) *Wallet { + wallet := &Wallet{ + Hub: hub, + card: card, + } + return wallet +} + +// transmit sends an APDU to the smartcard and receives and decodes the response. +// It automatically handles requests by the card to fetch the return data separately, +// and returns an error if the response status code is not success. +func transmit(card *pcsc.Card, command *commandAPDU) (*responseAPDU, error) { + data, err := command.serialize() + if err != nil { + return nil, err + } + + responseData, _, err := card.Transmit(data) + if err != nil { + return nil, err + } + + response := new(responseAPDU) + if err = response.deserialize(responseData); err != nil { + return nil, err + } + + // Are we being asked to fetch the response separately? + if response.Sw1 == sw1GetResponse && (command.Cla != claISO7816 || command.Ins != insGetResponse) { + return transmit(card, &commandAPDU{ + Cla: claISO7816, + Ins: insGetResponse, + P1: 0, + P2: 0, + Data: nil, + Le: response.Sw2, + }) + } + + if response.Sw1 != sw1Ok { + return nil, fmt.Errorf("Unexpected insecure response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", command.Cla, command.Ins, response.Sw1, response.Sw2) + } + + return response, nil +} + +// applicationInfo encodes information about the smartcard application - its +// instance UID and public key. +type applicationInfo struct { + InstanceUID []byte `asn1:"tag:15"` + PublicKey []byte `asn1:"tag:0"` +} + +// connect connects to the wallet application and establishes a secure channel with it. +// must be called before any other interaction with the wallet. +func (w *Wallet) connect() error { + w.lock.Lock() + defer w.lock.Unlock() + + appinfo, err := w.doselect() + if err != nil { + return err + } + + channel, err := NewSecureChannelSession(w.card, appinfo.PublicKey) + if err != nil { + return err + } + + w.PublicKey = appinfo.PublicKey + w.log = log.New("url", w.URL()) + w.session = &Session{ + Wallet: w, + Channel: channel, + } + return nil +} + +// doselect is an internal (unlocked) function to send a SELECT APDU to the card. +func (w *Wallet) doselect() (*applicationInfo, error) { + response, err := transmit(w.card, &commandAPDU{ + Cla: claISO7816, + Ins: insSelect, + P1: 4, + P2: 0, + Data: appletAID, + }) + if err != nil { + return nil, err + } + + appinfo := new(applicationInfo) + if _, err := asn1.UnmarshalWithParams(response.Data, appinfo, "tag:4"); err != nil { + return nil, err + } + return appinfo, nil +} + +// ping checks the card's status and returns an error if unsuccessful. +func (w *Wallet) ping() error { + w.lock.Lock() + defer w.lock.Unlock() + + // We can't ping if not paired + if !w.session.paired() { + return nil + } + if _, err := w.session.walletStatus(); err != nil { + return err + } + return nil +} + +// release releases any resources held by an open wallet instance. +func (w *Wallet) release() error { + if w.session != nil { + return w.session.release() + } + return nil +} + +// pair is an internal (unlocked) function for establishing a new pairing +// with the wallet. +func (w *Wallet) pair(puk []byte) error { + if w.session.paired() { + return fmt.Errorf("Wallet already paired") + } + pairing, err := w.session.pair(puk) + if err != nil { + return err + } + if err = w.Hub.setPairing(w, &pairing); err != nil { + return err + } + return w.session.authenticate(pairing) +} + +// Unpair deletes an existing wallet pairing. +func (w *Wallet) Unpair(pin []byte) error { + w.lock.Lock() + defer w.lock.Unlock() + + if !w.session.paired() { + return fmt.Errorf("wallet %x not paired", w.PublicKey) + } + if err := w.session.verifyPin(pin); err != nil { + return fmt.Errorf("failed to verify pin: %s", err) + } + if err := w.session.unpair(); err != nil { + return fmt.Errorf("failed to unpair: %s", err) + } + if err := w.Hub.setPairing(w, nil); err != nil { + return err + } + return nil +} + +// URL retrieves the canonical path under which this wallet is reachable. It is +// user by upper layers to define a sorting order over all wallets from multiple +// backends. +func (w *Wallet) URL() accounts.URL { + return accounts.URL{ + Scheme: w.Hub.scheme, + Path: fmt.Sprintf("%x", w.PublicKey[1:5]), // Byte #0 isn't unique; 1:5 covers << 64K cards, bump to 1:9 for << 4M + } +} + +// Status returns a textual status to aid the user in the current state of the +// wallet. It also returns an error indicating any failure the wallet might have +// encountered. +func (w *Wallet) Status() (string, error) { + w.lock.Lock() + defer w.lock.Unlock() + + // If the card is not paired, we can only wait + if !w.session.paired() { + return "Unpaired, waiting for pairing password", nil + } + // Yay, we have an encrypted session, retrieve the actual status + status, err := w.session.walletStatus() + if err != nil { + return fmt.Sprintf("Failed: %v", err), err + } + switch { + case !w.session.verified && status.PinRetryCount == 0 && status.PukRetryCount == 0: + return fmt.Sprintf("Bricked, waiting for full wipe"), nil + case !w.session.verified && status.PinRetryCount == 0: + return fmt.Sprintf("Blocked, waiting for PUK (%d attempts left) and new PIN", status.PukRetryCount), nil + case !w.session.verified: + return fmt.Sprintf("Locked, waiting for PIN (%d attempts left)", status.PinRetryCount), nil + case !status.Initialized: + return fmt.Sprintf("Empty, waiting for initialization"), nil + default: + return fmt.Sprintf("Online"), nil + } +} + +// Open initializes access to a wallet instance. It is not meant to unlock or +// decrypt account keys, rather simply to establish a connection to hardware +// wallets and/or to access derivation seeds. +// +// The passphrase parameter may or may not be used by the implementation of a +// particular wallet instance. The reason there is no passwordless open method +// is to strive towards a uniform wallet handling, oblivious to the different +// backend providers. +// +// Please note, if you open a wallet, you must close it to release any allocated +// resources (especially important when working with hardware wallets). +func (w *Wallet) Open(passphrase string) error { + w.lock.Lock() + defer w.lock.Unlock() + + // If the session is already open, bail out + if w.session.verified { + return ErrAlreadyOpen + } + // If the smart card is not yet paired, attempt to do so either from a previous + // pairing key or form the supplied PUK code. + if !w.session.paired() { + // If a previous pairing exists, only ever try to use that + if pairing := w.Hub.pairing(w); pairing != nil { + if err := w.session.authenticate(*pairing); err != nil { + return fmt.Errorf("failed to authenticate card %x: %s", w.PublicKey[:4], err) + } + // Pairing still ok, fall through to PIN checks + } else { + // If no passphrase was supplied, request the PUK from the user + if passphrase == "" { + return ErrPairingPasswordNeeded + } + // Attempt to pair the smart card with the user supplied PUK + if err := w.pair([]byte(passphrase)); err != nil { + return err + } + // Pairing succeeded, fall through to PIN checks. This will of course fail, + // but we can't return ErrPINNeeded directly here becase we don't know whether + // a PIN check or a PIN reset is needed. + passphrase = "" + } + } + // The smart card was successfully paired, retrieve its status to check whether + // PIN verification or unblocking is needed. + status, err := w.session.walletStatus() + if err != nil { + return err + } + // Request the appropriate next authentication data, or use the one supplied + switch { + case passphrase == "" && status.PinRetryCount > 0: + return ErrPINNeeded + case passphrase == "": + return ErrPINUnblockNeeded + case status.PinRetryCount > 0: + if !regexp.MustCompile(`^[0-9]{6,}$`).MatchString(passphrase) { + w.log.Error("PIN needs to be at least 6 digits") + return ErrPINNeeded + } + if err := w.session.verifyPin([]byte(passphrase)); err != nil { + return err + } + default: + if !regexp.MustCompile(`^[0-9]{12,}$`).MatchString(passphrase) { + w.log.Error("PUK needs to be at least 12 digits") + return ErrPINUnblockNeeded + } + if err := w.session.unblockPin([]byte(passphrase)); err != nil { + return err + } + } + // Smart card paired and unlocked, initialize and register + w.deriveReq = make(chan chan struct{}) + w.deriveQuit = make(chan chan error) + + go w.selfDerive() + + // Notify anyone listening for wallet events that a new device is accessible + go w.Hub.updateFeed.Send(accounts.WalletEvent{Wallet: w, Kind: accounts.WalletOpened}) + + return nil +} + +// Close stops and closes the wallet, freeing any resources. +func (w *Wallet) Close() error { + // Ensure the wallet was opened + w.lock.Lock() + dQuit := w.deriveQuit + w.lock.Unlock() + + // Terminate the self-derivations + var derr error + if dQuit != nil { + errc := make(chan error) + dQuit <- errc + derr = <-errc // Save for later, we *must* close the USB + } + // Terminate the device connection + w.lock.Lock() + defer w.lock.Unlock() + + w.deriveQuit = nil + w.deriveReq = nil + + if err := w.release(); err != nil { + return err + } + return derr +} + +// selfDerive is an account derivation loop that upon request attempts to find +// new non-zero accounts. +func (w *Wallet) selfDerive() { + w.log.Debug("Smart card wallet self-derivation started") + defer w.log.Debug("Smart card wallet self-derivation stopped") + + // Execute self-derivations until termination or error + var ( + reqc chan struct{} + errc chan error + err error + ) + for errc == nil && err == nil { + // Wait until either derivation or termination is requested + select { + case errc = <-w.deriveQuit: + // Termination requested + continue + case reqc = <-w.deriveReq: + // Account discovery requested + } + // Derivation needs a chain and device access, skip if either unavailable + w.lock.Lock() + if w.session == nil || w.deriveChain == nil { + w.lock.Unlock() + reqc <- struct{}{} + continue + } + pairing := w.Hub.pairing(w) + + // Device lock obtained, derive the next batch of accounts + var ( + paths []accounts.DerivationPath + nextAcc accounts.Account + + nextPaths = append([]accounts.DerivationPath{}, w.deriveNextPaths...) + nextAddrs = append([]common.Address{}, w.deriveNextAddrs...) + + context = context.Background() + ) + for i := 0; i < len(nextAddrs); i++ { + for empty := false; !empty; { + // Retrieve the next derived Ethereum account + if nextAddrs[i] == (common.Address{}) { + if nextAcc, err = w.session.derive(nextPaths[i]); err != nil { + w.log.Warn("Smartcard wallet account derivation failed", "err", err) + break + } + nextAddrs[i] = nextAcc.Address + } + // Check the account's status against the current chain state + var ( + balance *big.Int + nonce uint64 + ) + balance, err = w.deriveChain.BalanceAt(context, nextAddrs[i], nil) + if err != nil { + w.log.Warn("Smartcard wallet balance retrieval failed", "err", err) + break + } + nonce, err = w.deriveChain.NonceAt(context, nextAddrs[i], nil) + if err != nil { + w.log.Warn("Smartcard wallet nonce retrieval failed", "err", err) + break + } + // If the next account is empty, stop self-derivation, but add for the last base path + if balance.Sign() == 0 && nonce == 0 { + empty = true + if i < len(nextAddrs)-1 { + break + } + } + // We've just self-derived a new account, start tracking it locally + path := make(accounts.DerivationPath, len(nextPaths[i])) + copy(path[:], nextPaths[i][:]) + paths = append(paths, path) + + // Display a log message to the user for new (or previously empty accounts) + if _, known := pairing.Accounts[nextAddrs[i]]; !known || !empty || nextAddrs[i] != w.deriveNextAddrs[i] { + w.log.Info("Smartcard wallet discovered new account", "address", nextAddrs[i], "path", path, "balance", balance, "nonce", nonce) + } + pairing.Accounts[nextAddrs[i]] = path + + // Fetch the next potential account + if !empty { + nextAddrs[i] = common.Address{} + nextPaths[i][len(nextPaths[i])-1]++ + } + } + } + // If there are new accounts, write them out + if len(paths) > 0 { + err = w.Hub.setPairing(w, pairing) + } + // Shift the self-derivation forward + w.deriveNextAddrs = nextAddrs + w.deriveNextPaths = nextPaths + + // Self derivation complete, release device lock + w.lock.Unlock() + + // Notify the user of termination and loop after a bit of time (to avoid trashing) + reqc <- struct{}{} + if err == nil { + select { + case errc = <-w.deriveQuit: + // Termination requested, abort + case <-time.After(selfDeriveThrottling): + // Waited enough, willing to self-derive again + } + } + } + // In case of error, wait for termination + if err != nil { + w.log.Debug("Smartcard wallet self-derivation failed", "err", err) + errc = <-w.deriveQuit + } + errc <- err +} + +// Accounts retrieves the list of signing accounts the wallet is currently aware +// of. For hierarchical deterministic wallets, the list will not be exhaustive, +// rather only contain the accounts explicitly pinned during account derivation. +func (w *Wallet) Accounts() []accounts.Account { + // Attempt self-derivation if it's running + reqc := make(chan struct{}, 1) + select { + case w.deriveReq <- reqc: + // Self-derivation request accepted, wait for it + <-reqc + default: + // Self-derivation offline, throttled or busy, skip + } + + w.lock.Lock() + defer w.lock.Unlock() + + if pairing := w.Hub.pairing(w); pairing != nil { + ret := make([]accounts.Account, 0, len(pairing.Accounts)) + for address, path := range pairing.Accounts { + ret = append(ret, w.makeAccount(address, path)) + } + sort.Sort(accounts.AccountsByURL(ret)) + return ret + } + return nil +} + +func (w *Wallet) makeAccount(address common.Address, path accounts.DerivationPath) accounts.Account { + return accounts.Account{ + Address: address, + URL: accounts.URL{ + Scheme: w.Hub.scheme, + Path: fmt.Sprintf("%x/%s", w.PublicKey[1:3], path.String()), + }, + } +} + +// Contains returns whether an account is part of this particular wallet or not. +func (w *Wallet) Contains(account accounts.Account) bool { + if pairing := w.Hub.pairing(w); pairing != nil { + _, ok := pairing.Accounts[account.Address] + return ok + } + return false +} + +// Initialize installs a keypair generated from the provided key into the wallet. +func (w *Wallet) Initialize(seed []byte) error { + go w.selfDerive() + // DO NOT lock at this stage, as the initialize + // function relies on Status() + return w.session.initialize(seed) +} + +// Derive attempts to explicitly derive a hierarchical deterministic account at +// the specified derivation path. If requested, the derived account will be added +// to the wallet's tracked account list. +func (w *Wallet) Derive(path accounts.DerivationPath, pin bool) (accounts.Account, error) { + w.lock.Lock() + defer w.lock.Unlock() + + account, err := w.session.derive(path) + if err != nil { + return accounts.Account{}, err + } + + if pin { + pairing := w.Hub.pairing(w) + pairing.Accounts[account.Address] = path + if err := w.Hub.setPairing(w, pairing); err != nil { + return accounts.Account{}, err + } + } + + return account, nil +} + +// SelfDerive sets a base account derivation path from which the wallet attempts +// to discover non zero accounts and automatically add them to list of tracked +// accounts. +// +// Note, self derivaton will increment the last component of the specified path +// opposed to decending into a child path to allow discovering accounts starting +// from non zero components. +// +// Some hardware wallets switched derivation paths through their evolution, so +// this method supports providing multiple bases to discover old user accounts +// too. Only the last base will be used to derive the next empty account. +// +// You can disable automatic account discovery by calling SelfDerive with a nil +// chain state reader. +func (w *Wallet) SelfDerive(bases []accounts.DerivationPath, chain ethereum.ChainStateReader) { + w.lock.Lock() + defer w.lock.Unlock() + + w.deriveNextPaths = make([]accounts.DerivationPath, len(bases)) + for i, base := range bases { + w.deriveNextPaths[i] = make(accounts.DerivationPath, len(base)) + copy(w.deriveNextPaths[i][:], base[:]) + } + w.deriveNextAddrs = make([]common.Address, len(bases)) + w.deriveChain = chain +} + +// SignData requests the wallet to sign the hash of the given data. +// +// It looks up the account specified either solely via its address contained within, +// or optionally with the aid of any location metadata from the embedded URL field. +// +// If the wallet requires additional authentication to sign the request (e.g. +// a password to decrypt the account, or a PIN code o verify the transaction), +// an AuthNeededError instance will be returned, containing infos for the user +// about which fields or actions are needed. The user may retry by providing +// the needed details via SignDataWithPassphrase, or by other means (e.g. unlock +// the account in a keystore). +func (w *Wallet) SignData(account accounts.Account, mimeType string, data []byte) ([]byte, error) { + return w.signHash(account, crypto.Keccak256(data)) +} + +func (w *Wallet) signHash(account accounts.Account, hash []byte) ([]byte, error) { + w.lock.Lock() + defer w.lock.Unlock() + + path, err := w.findAccountPath(account) + if err != nil { + return nil, err + } + + return w.session.sign(path, hash) +} + +// SignTx requests the wallet to sign the given transaction. +// +// It looks up the account specified either solely via its address contained within, +// or optionally with the aid of any location metadata from the embedded URL field. +// +// If the wallet requires additional authentication to sign the request (e.g. +// a password to decrypt the account, or a PIN code o verify the transaction), +// an AuthNeededError instance will be returned, containing infos for the user +// about which fields or actions are needed. The user may retry by providing +// the needed details via SignTxWithPassphrase, or by other means (e.g. unlock +// the account in a keystore). +func (w *Wallet) SignTx(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) { + signer := types.NewEIP155Signer(chainID) + hash := signer.Hash(tx) + sig, err := w.signHash(account, hash[:]) + if err != nil { + return nil, err + } + return tx.WithSignature(signer, sig) +} + +// SignDataWithPassphrase requests the wallet to sign the given hash with the +// given passphrase as extra authentication information. +// +// It looks up the account specified either solely via its address contained within, +// or optionally with the aid of any location metadata from the embedded URL field. +func (w *Wallet) SignDataWithPassphrase(account accounts.Account, passphrase, mimeType string, data []byte) ([]byte, error) { + return w.signHashWithPassphrase(account, passphrase, crypto.Keccak256(data)) +} + +func (w *Wallet) signHashWithPassphrase(account accounts.Account, passphrase string, hash []byte) ([]byte, error) { + if !w.session.verified { + if err := w.Open(passphrase); err != nil { + return nil, err + } + } + + return w.signHash(account, hash) +} + +// SignText requests the wallet to sign the hash of a given piece of data, prefixed +// by the Ethereum prefix scheme +// It looks up the account specified either solely via its address contained within, +// or optionally with the aid of any location metadata from the embedded URL field. +// +// If the wallet requires additional authentication to sign the request (e.g. +// a password to decrypt the account, or a PIN code o verify the transaction), +// an AuthNeededError instance will be returned, containing infos for the user +// about which fields or actions are needed. The user may retry by providing +// the needed details via SignHashWithPassphrase, or by other means (e.g. unlock +// the account in a keystore). +func (w *Wallet) SignText(account accounts.Account, text []byte) ([]byte, error) { + return w.signHash(account, accounts.TextHash(text)) +} + +// SignTextWithPassphrase implements accounts.Wallet, attempting to sign the +// given hash with the given account using passphrase as extra authentication +func (w *Wallet) SignTextWithPassphrase(account accounts.Account, passphrase string, text []byte) ([]byte, error) { + return w.signHashWithPassphrase(account, passphrase, crypto.Keccak256(accounts.TextHash(text))) +} + +// SignTxWithPassphrase requests the wallet to sign the given transaction, with the +// given passphrase as extra authentication information. +// +// It looks up the account specified either solely via its address contained within, +// or optionally with the aid of any location metadata from the embedded URL field. +func (w *Wallet) SignTxWithPassphrase(account accounts.Account, passphrase string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) { + if !w.session.verified { + if err := w.Open(passphrase); err != nil { + return nil, err + } + } + return w.SignTx(account, tx, chainID) +} + +// findAccountPath returns the derivation path for the provided account. +// It first checks for the address in the list of pinned accounts, and if it is +// not found, attempts to parse the derivation path from the account's URL. +func (w *Wallet) findAccountPath(account accounts.Account) (accounts.DerivationPath, error) { + pairing := w.Hub.pairing(w) + if path, ok := pairing.Accounts[account.Address]; ok { + return path, nil + } + + // Look for the path in the URL + if account.URL.Scheme != w.Hub.scheme { + return nil, fmt.Errorf("Scheme %s does not match wallet scheme %s", account.URL.Scheme, w.Hub.scheme) + } + + parts := strings.SplitN(account.URL.Path, "/", 2) + if len(parts) != 2 { + return nil, fmt.Errorf("Invalid URL format: %s", account.URL) + } + + if parts[0] != fmt.Sprintf("%x", w.PublicKey[1:3]) { + return nil, fmt.Errorf("URL %s is not for this wallet", account.URL) + } + + return accounts.ParseDerivationPath(parts[1]) +} + +// Session represents a secured communication session with the wallet. +type Session struct { + Wallet *Wallet // A handle to the wallet that opened the session + Channel *SecureChannelSession // A secure channel for encrypted messages + verified bool // Whether the pin has been verified in this session. +} + +// pair establishes a new pairing over this channel, using the provided secret. +func (s *Session) pair(secret []byte) (smartcardPairing, error) { + err := s.Channel.Pair(secret) + if err != nil { + return smartcardPairing{}, err + } + + return smartcardPairing{ + PublicKey: s.Wallet.PublicKey, + PairingIndex: s.Channel.PairingIndex, + PairingKey: s.Channel.PairingKey, + Accounts: make(map[common.Address]accounts.DerivationPath), + }, nil +} + +// unpair deletes an existing pairing. +func (s *Session) unpair() error { + if !s.verified { + return fmt.Errorf("Unpair requires that the PIN be verified") + } + return s.Channel.Unpair() +} + +// verifyPin unlocks a wallet with the provided pin. +func (s *Session) verifyPin(pin []byte) error { + if _, err := s.Channel.transmitEncrypted(claSCWallet, insVerifyPin, 0, 0, pin); err != nil { + return err + } + s.verified = true + return nil +} + +// unblockPin unblocks a wallet with the provided puk and resets the pin to the +// new one specified. +func (s *Session) unblockPin(pukpin []byte) error { + if _, err := s.Channel.transmitEncrypted(claSCWallet, insUnblockPin, 0, 0, pukpin); err != nil { + return err + } + s.verified = true + return nil +} + +// release releases resources associated with the channel. +func (s *Session) release() error { + return s.Wallet.card.Disconnect(pcsc.LeaveCard) +} + +// paired returns true if a valid pairing exists. +func (s *Session) paired() bool { + return s.Channel.PairingKey != nil +} + +// authenticate uses an existing pairing to establish a secure channel. +func (s *Session) authenticate(pairing smartcardPairing) error { + if !bytes.Equal(s.Wallet.PublicKey, pairing.PublicKey) { + return fmt.Errorf("Cannot pair using another wallet's pairing; %x != %x", s.Wallet.PublicKey, pairing.PublicKey) + } + s.Channel.PairingKey = pairing.PairingKey + s.Channel.PairingIndex = pairing.PairingIndex + return s.Channel.Open() +} + +// walletStatus describes a smartcard wallet's status information. +type walletStatus struct { + PinRetryCount int // Number of remaining PIN retries + PukRetryCount int // Number of remaining PUK retries + Initialized bool // Whether the card has been initialized with a private key +} + +// walletStatus fetches the wallet's status from the card. +func (s *Session) walletStatus() (*walletStatus, error) { + response, err := s.Channel.transmitEncrypted(claSCWallet, insStatus, statusP1WalletStatus, 0, nil) + if err != nil { + return nil, err + } + + status := new(walletStatus) + if _, err := asn1.UnmarshalWithParams(response.Data, status, "tag:3"); err != nil { + return nil, err + } + return status, nil +} + +// derivationPath fetches the wallet's current derivation path from the card. +func (s *Session) derivationPath() (accounts.DerivationPath, error) { + response, err := s.Channel.transmitEncrypted(claSCWallet, insStatus, statusP1Path, 0, nil) + if err != nil { + return nil, err + } + buf := bytes.NewReader(response.Data) + path := make(accounts.DerivationPath, len(response.Data)/4) + return path, binary.Read(buf, binary.BigEndian, &path) +} + +// initializeData contains data needed to initialize the smartcard wallet. +type initializeData struct { + PublicKey []byte `asn1:"tag:0"` + PrivateKey []byte `asn1:"tag:1"` + ChainCode []byte `asn1:"tag:2"` +} + +// initialize initializes the card with new key data. +func (s *Session) initialize(seed []byte) error { + // Check that the wallet isn't currently initialized, + // otherwise the key would be overwritten. + status, err := s.Wallet.Status() + if err != nil { + return err + } + if status == "Online" { + return fmt.Errorf("card is already initialized, cowardly refusing to proceed") + } + + s.Wallet.lock.Lock() + defer s.Wallet.lock.Unlock() + + // HMAC the seed to produce the private key and chain code + mac := hmac.New(sha512.New, []byte("Bitcoin seed")) + mac.Write(seed) + seed = mac.Sum(nil) + + key, err := crypto.ToECDSA(seed[:32]) + if err != nil { + return err + } + + id := initializeData{} + id.PublicKey = crypto.FromECDSAPub(&key.PublicKey) + id.PrivateKey = seed[:32] + id.ChainCode = seed[32:] + data, err := asn1.Marshal(id) + if err != nil { + return err + } + + // Nasty hack to force the top-level struct tag to be context-specific + data[0] = 0xA1 + + _, err = s.Channel.transmitEncrypted(claSCWallet, insLoadKey, 0x02, 0, data) + return err +} + +// derive derives a new HD key path on the card. +func (s *Session) derive(path accounts.DerivationPath) (accounts.Account, error) { + startingPoint, path, err := derivationpath.Decode(path.String()) + if err != nil { + return accounts.Account{}, err + } + + var p1 uint8 + switch startingPoint { + case derivationpath.StartingPointMaster: + p1 = P1DeriveKeyFromMaster + case derivationpath.StartingPointParent: + p1 = P1DeriveKeyFromParent + case derivationpath.StartingPointCurrent: + p1 = P1DeriveKeyFromCurrent + default: + return accounts.Account{}, fmt.Errorf("invalid startingPoint %d", startingPoint) + } + + data := new(bytes.Buffer) + for _, segment := range path { + if err := binary.Write(data, binary.BigEndian, segment); err != nil { + return accounts.Account{}, err + } + } + + _, err = s.Channel.transmitEncrypted(claSCWallet, insDeriveKey, p1, 0, data.Bytes()) + if err != nil { + return accounts.Account{}, err + } + + response, err := s.Channel.transmitEncrypted(claSCWallet, insSign, 0, 0, DerivationSignatureHash[:]) + if err != nil { + return accounts.Account{}, err + } + + sigdata := new(signatureData) + if _, err := asn1.UnmarshalWithParams(response.Data, sigdata, "tag:0"); err != nil { + return accounts.Account{}, err + } + rbytes, sbytes := sigdata.Signature.R.Bytes(), sigdata.Signature.S.Bytes() + sig := make([]byte, 65) + copy(sig[32-len(rbytes):32], rbytes) + copy(sig[64-len(sbytes):64], sbytes) + + if err := confirmPublicKey(sig, sigdata.PublicKey); err != nil { + return accounts.Account{}, err + } + pub, err := crypto.UnmarshalPubkey(sigdata.PublicKey) + if err != nil { + return accounts.Account{}, err + } + return s.Wallet.makeAccount(crypto.PubkeyToAddress(*pub), path), nil +} + +// keyExport contains information on an exported keypair. +type keyExport struct { + PublicKey []byte `asn1:"tag:0"` + PrivateKey []byte `asn1:"tag:1,optional"` +} + +// publicKey returns the public key for the current derivation path. +func (s *Session) publicKey() ([]byte, error) { + response, err := s.Channel.transmitEncrypted(claSCWallet, insExportKey, exportP1Any, exportP2Pubkey, nil) + if err != nil { + return nil, err + } + keys := new(keyExport) + if _, err := asn1.UnmarshalWithParams(response.Data, keys, "tag:1"); err != nil { + return nil, err + } + return keys.PublicKey, nil +} + +// signatureData contains information on a signature - the signature itself and +// the corresponding public key. +type signatureData struct { + PublicKey []byte `asn1:"tag:0"` + Signature struct { + R *big.Int + S *big.Int + } +} + +// sign asks the card to sign a message, and returns a valid signature after +// recovering the v value. +func (s *Session) sign(path accounts.DerivationPath, hash []byte) ([]byte, error) { + startTime := time.Now() + _, err := s.derive(path) + if err != nil { + return nil, err + } + deriveTime := time.Now() + + response, err := s.Channel.transmitEncrypted(claSCWallet, insSign, signP1PrecomputedHash, signP2OnlyBlock, hash) + if err != nil { + return nil, err + } + sigdata := new(signatureData) + if _, err := asn1.UnmarshalWithParams(response.Data, sigdata, "tag:0"); err != nil { + return nil, err + } + // Serialize the signature + rbytes, sbytes := sigdata.Signature.R.Bytes(), sigdata.Signature.S.Bytes() + sig := make([]byte, 65) + copy(sig[32-len(rbytes):32], rbytes) + copy(sig[64-len(sbytes):64], sbytes) + + // Recover the V value. + sig, err = makeRecoverableSignature(hash, sig, sigdata.PublicKey) + if err != nil { + return nil, err + } + log.Debug("Signed using smartcard", "deriveTime", deriveTime.Sub(startTime), "signingTime", time.Since(deriveTime)) + + return sig, nil +} + +// confirmPublicKey confirms that the given signature belongs to the specified key. +func confirmPublicKey(sig, pubkey []byte) error { + _, err := makeRecoverableSignature(DerivationSignatureHash[:], sig, pubkey) + return err +} + +// makeRecoverableSignature uses a signature and an expected public key to +// recover the v value and produce a recoverable signature. +func makeRecoverableSignature(hash, sig, expectedPubkey []byte) ([]byte, error) { + var libraryError error + for v := 0; v < 2; v++ { + sig[64] = byte(v) + if pubkey, err := crypto.Ecrecover(hash, sig); err == nil { + if bytes.Equal(pubkey, expectedPubkey) { + return sig, nil + } + } else { + libraryError = err + } + } + if libraryError != nil { + return nil, libraryError + } + return nil, ErrPubkeyMismatch +} diff --git a/accounts/sort.go b/accounts/sort.go new file mode 100644 index 0000000..f467621 --- /dev/null +++ b/accounts/sort.go @@ -0,0 +1,31 @@ +// Copyright 2018 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package accounts + +// AccountsByURL implements sort.Interface for []Account based on the URL field. +type AccountsByURL []Account + +func (a AccountsByURL) Len() int { return len(a) } +func (a AccountsByURL) Swap(i, j int) { a[i], a[j] = a[j], a[i] } +func (a AccountsByURL) Less(i, j int) bool { return a[i].URL.Cmp(a[j].URL) < 0 } + +// WalletsByURL implements sort.Interface for []Wallet based on the URL field. +type WalletsByURL []Wallet + +func (w WalletsByURL) Len() int { return len(w) } +func (w WalletsByURL) Swap(i, j int) { w[i], w[j] = w[j], w[i] } +func (w WalletsByURL) Less(i, j int) bool { return w[i].URL().Cmp(w[j].URL()) < 0 } diff --git a/accounts/url.go b/accounts/url.go new file mode 100644 index 0000000..a5add10 --- /dev/null +++ b/accounts/url.go @@ -0,0 +1,104 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package accounts + +import ( + "encoding/json" + "errors" + "fmt" + "strings" +) + +// URL represents the canonical identification URL of a wallet or account. +// +// It is a simplified version of url.URL, with the important limitations (which +// are considered features here) that it contains value-copyable components only, +// as well as that it doesn't do any URL encoding/decoding of special characters. +// +// The former is important to allow an account to be copied without leaving live +// references to the original version, whereas the latter is important to ensure +// one single canonical form opposed to many allowed ones by the RFC 3986 spec. +// +// As such, these URLs should not be used outside of the scope of an Ethereum +// wallet or account. +type URL struct { + Scheme string // Protocol scheme to identify a capable account backend + Path string // Path for the backend to identify a unique entity +} + +// parseURL converts a user supplied URL into the accounts specific structure. +func parseURL(url string) (URL, error) { + parts := strings.Split(url, "://") + if len(parts) != 2 || parts[0] == "" { + return URL{}, errors.New("protocol scheme missing") + } + return URL{ + Scheme: parts[0], + Path: parts[1], + }, nil +} + +// String implements the stringer interface. +func (u URL) String() string { + if u.Scheme != "" { + return fmt.Sprintf("%s://%s", u.Scheme, u.Path) + } + return u.Path +} + +// TerminalString implements the log.TerminalStringer interface. +func (u URL) TerminalString() string { + url := u.String() + if len(url) > 32 { + return url[:31] + "…" + } + return url +} + +// MarshalJSON implements the json.Marshaller interface. +func (u URL) MarshalJSON() ([]byte, error) { + return json.Marshal(u.String()) +} + +// UnmarshalJSON parses url. +func (u *URL) UnmarshalJSON(input []byte) error { + var textURL string + err := json.Unmarshal(input, &textURL) + if err != nil { + return err + } + url, err := parseURL(textURL) + if err != nil { + return err + } + u.Scheme = url.Scheme + u.Path = url.Path + return nil +} + +// Cmp compares x and y and returns: +// +// -1 if x < y +// 0 if x == y +// +1 if x > y +// +func (u URL) Cmp(url URL) int { + if u.Scheme == url.Scheme { + return strings.Compare(u.Path, url.Path) + } + return strings.Compare(u.Scheme, url.Scheme) +} |