package main import ( "context" "crypto/ecdsa" "fmt" "math/big" "github.com/ava-labs/coreth/params" "github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/core/types" "github.com/ethereum/go-ethereum/crypto" "github.com/ethereum/go-ethereum/ethclient" ) var ( uri = "http://127.0.0.1:9650/ext/bc/C/rpc" nativeAssetBalanceAddr = common.HexToAddress("0x0100000000000000000000000000000000000001") nativeAssetCallAddr = common.HexToAddress("0x0100000000000000000000000000000000000002") chainID = new(big.Int).SetUint64(43112) privateKey *ecdsa.PrivateKey address common.Address erc20 common.Address assetID *big.Int amount *big.Int gasLimit = uint64(700000) gasPrice = params.MinGasPrice ) func init() { // Private Key to sign deposit transaction // To export from MetaMask: // 1) Click ellipsis on right hand side of account page // 2) View Account Details // 3) Export Private Key pk, err := crypto.HexToECDSA("da777cd656c8760a7d378ae04d7dd0cd7a703c450c84e6c2faa886ca97517df7") if err != nil { panic(err) } privateKey = pk // Extract From Address from the private key address = crypto.PubkeyToAddress(privateKey.PublicKey) // Address of ARC-20 to deposit funds in erc20 = common.HexToAddress("0x721F9Af7631605713133ccc502E32eA4d43CDfec") // AssetID of the underlying asset assetID = common.HexToHash("0x42f0d24c970eb6c567ea63a68b97d8e357a7fc8d9f73489c7761f1382b295db4").Big() amount = new(big.Int).SetUint64(100) } // createDepositCallData creates the callData argument to nativeAssetTransfer to move [amount] // of [assetID] to [erc20] address and call the deposit function with signature "deposit()" func createDepositCallData(erc20 common.Address, assetID, amount *big.Int) []byte { // erc20 addr, assetID, assetAmount, callData signatureHash := crypto.Keccak256([]byte("deposit()")) fmt.Printf("signatureHash: 0x%x\n", signatureHash) functionSignature := signatureHash[:4] data := make([]byte, 0, 84) data = append(data, erc20.Bytes()...) data = append(data, common.LeftPadBytes(assetID.Bytes(), 32)...) data = append(data, common.LeftPadBytes(amount.Bytes(), 32)...) data = append(data, functionSignature...) fmt.Printf("deposit callData: 0x%x\n", data) return data } // createDepositTransaction creates a transaction to deposit native asset funds in [erc20] func createDepositTransaction(nonce uint64, erc20 common.Address, assetID, amount *big.Int, gasLimit uint64, gasPrice *big.Int) *types.Transaction { callData := createDepositCallData(erc20, assetID, amount) return types.NewTransaction(nonce, nativeAssetCallAddr, new(big.Int), gasLimit, gasPrice, callData) } // Deposit funds into an ARC-20 Contract func main() { client, err := ethclient.Dial(uri) if err != nil { panic(err) } ctx := context.Background() nonce, err := client.NonceAt(ctx, address, nil) if err != nil { panic(err) } fmt.Printf("Creating deposit transaction from: %s, erc20 address: %s, assetID: %d, amount: %d, nonce: %d\n", address.Hex(), erc20.Hex(), assetID, amount, nonce) // Create and sign deposit transaction from account that has been funded with sufficient AVAX to // pay gas costs and sufficient amount of [assetID] to make the deposit tx := createDepositTransaction(nonce, erc20, assetID, amount, gasLimit, gasPrice) signer := types.NewEIP155Signer(chainID) signedTx, err := types.SignTx(tx, signer, privateKey) if err != nil { panic(err) } // Issue the signed transaction to the client if err := client.SendTransaction(ctx, signedTx); err != nil { panic(err) } txHash := signedTx.Hash() fmt.Printf("txHash: %s\n", txHash.Hex()) }