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|
from twisted.internet.protocol import Protocol
from twisted.internet.protocol import Factory
from twisted.internet.endpoints import TCP4ServerEndpoint
from twisted.protocols.policies import TimeoutMixin
from sqlalchemy import create_engine, and_
from sqlalchemy.orm import sessionmaker
from sqlalchemy.orm.exc import NoResultFound, MultipleResultsFound
from collections import deque
import struct
import os
import logging
from exc import *
from model import *
def get_hex(data):
return "".join([hex(ord(c))[2:].zfill(2) for c in data])
db_path = "root:helloworld@localhost/piztor2"
#db_path = "piztor.sqlite"
FORMAT = "%(asctime)-15s %(message)s"
logging.basicConfig(format = FORMAT)
logger = logging.getLogger('piztor_server')
logger.setLevel(logging.INFO)
engine = create_engine('mysql://' + db_path, echo = False, pool_size = 1024)
class _SectionSize:
LENGTH = 4
OPT_ID = 1
STATUS = 1
USER_ID = 4
USER_TOKEN = 32
GROUP_ID = 2
LATITUDE = 8
LONGITUDE = 8
PADDING = 1
_MAX_AUTH_HEAD_SIZE = _SectionSize.USER_TOKEN + \
MAX_USERNAME_SIZE + \
_SectionSize.PADDING
_HEADER_SIZE = _SectionSize.LENGTH + \
_SectionSize.OPT_ID
_MAX_TEXT_MESG_SIZE = 1024
_MAX_SUB_LIST_SIZE = 10
_MAX_PENDING_PUSH = 100
class _OptCode:
user_auth = 0x00
update_location = 0x01
user_info = 0x02
update_subscription = 0x03
user_logout = 0x04
open_push_tunnel = 0x05
send_text_mesg = 0x06
class _StatusCode:
sucess = 0x00
failure = 0x01
class PushData(object):
from hashlib import sha256
def pack(self, optcode, data):
self.finger_print = sha256(data).digest()
buff = struct.pack("!B32s", optcode, self.finger_print)
buff += data
buff = struct.pack("!L", _SectionSize.LENGTH + len(buff)) + buff
self.data = buff
class PushTextMesgData(PushData):
def __init__(self, mesg):
self.pack(0x00, mesg + chr(0))
class PushLocationData(PushData):
def __init__(self, uid, lat, lng):
self.pack(0x01, struct.pack("!Ldd", uid, lat, lng))
class PushTunnel(object):
def __init__(self, uid):
self.uid = uid
self.pending = deque()
self.conn = None
self.blocked = False
def close(self):
if self.conn:
self.conn.transport.loseConnection()
def add(self, pdata):
logger.info("-- Push data enqued --")
self.pending.append(pdata)
if len(self.pending) > _MAX_PENDING_PUSH:
logger.info("-- Push queue is full, discarded an obsolete push --")
self.pending.popleft() # discard old push
def on_receive(self, data):
front = self.pending.popleft()
length, optcode, fingerprint = struct.unpack("!LB32s", data)
if front.finger_print != fingerprint:
raise PiztorError
logger.info("-- Push data confirmed by client --")
self.blocked = False
self.push()
def push(self):
if self.blocked:
return
print "Pushing via " + str(self.uid)
print "Pending size: " + str(len(self.pending))
logger.info("Pushing...")
if (self.conn is None) or len(self.pending) == 0:
return
front = self.pending.popleft()
self.pending.appendleft(front)
self.conn.transport.write(front.data)
logger.info("-- Wrote push: %s --", get_hex(front.data))
self.blocked = True
def connect(self, conn):
conn.tunnel = self
if self.conn: # only one long-connection per user
self.conn.transport.loseConnection()
self.conn = conn
def on_connection_lost(self, conn):
if conn == self.conn:
self.conn = None
def pack_uid(user):
return struct.pack("!L", user.id)
def pack_username(user):
buff = user.username
buff += chr(0)
return buff
def pack_nickname(user):
buff = user.nickname
buff += chr(0)
return buff
def pack_sex(user):
return struct.pack("!B", 0x01 if user.sex else 0x00)
def pack_gid(user):
return struct.pack("!H", user.sec_id)
def pack_lat(user):
return struct.pack("!d", user.location.lat)
def pack_lng(user):
return struct.pack("!d", user.location.lng)
class RequestHandler(object):
push_tunnels = dict()
def __init__(self):
Session = sessionmaker(bind = engine)
self.session = Session()
def __del__(self):
self.session.close()
def check_size(self, tr_data):
if len(tr_data) > self._max_tr_data_size:
raise BadReqError("Authentication: Request size is too large")
@classmethod
def get_uauth(cls, token, username, session):
try:
uauth = session.query(UserAuth) \
.filter(UserAuth.token == token).one()
if uauth.user.username != username:
logger.warning("Token and username mismatch")
return None
uid = uauth.uid
if not cls.push_tunnels.has_key(uid):
cls.push_tunnels[uid] = PushTunnel(uid)
return uauth
except NoResultFound:
logger.warning("Incorrect token")
return None
except MultipleResultsFound:
raise DBCorruptionError()
@classmethod
def trunc_padding(cls, data):
leading = bytes()
for i in xrange(len(data)):
ch = data[i]
if ch == '\x00':
return (leading, data[i + 1:])
else:
leading += ch
# padding not found
return (None, data)
def pack(self, data):
return struct.pack("!LB",
_SectionSize.LENGTH + \
_SectionSize.OPT_ID + \
len(data), self._optcode) + data
_code_map = { 0x01 : pack_uid,
0x02 : pack_username,
0x03 : pack_nickname,
0x04 : pack_sex,
0x05 : pack_gid,
0x06 : pack_lat,
0x07 : pack_lng }
@classmethod
def pack_info_entry(cls, user, entry_code):
pack_method = cls._code_map[entry_code]
info_key = entry_code
return struct.pack("!B", info_key) + pack_method(user)
@classmethod
def pack_user_entry(cls, user):
buff = bytes()
for entry_code in cls._code_map:
buff += cls.pack_info_entry(user, entry_code)
buff += chr(0)
return buff
@classmethod
def pack_sub_list(cls, user):
buff = bytes()
for grp in user.sub:
buff += struct.pack("!H", grp.id)
buff += chr(0)
return buff
@classmethod
def unpack_sub_list(cls, data):
res = list()
idx = 0
end = len(data) - 1
while idx < end:
res.append(struct.unpack("!H",
data[idx:idx + _SectionSize.GROUP_ID])[0])
idx += _SectionSize.GROUP_ID
return res
class UserAuthHandler(RequestHandler):
_optcode = _OptCode.user_auth
_max_tr_data_size = MAX_USERNAME_SIZE + \
_SectionSize.PADDING + \
MAX_PASSWORD_SIZE + \
_SectionSize.PADDING
_failed_response = \
lambda self: self.pack(struct.pack("!B", _StatusCode.failure))
def handle(self, tr_data, conn):
self.check_size(tr_data)
logger.info("Reading auth data...")
pos = -1
for i in xrange(0, len(tr_data)):
if tr_data[i] == '\x00':
pos = i
break
if pos == -1:
raise BadReqError("Authentication: Malformed request body")
username = tr_data[0:pos]
password = tr_data[pos + 1:-1]
logger.info("Trying to login with " \
"(username = {0}, password = {1})" \
.format(username, password))
try:
user = self.session.query(UserModel) \
.filter(UserModel.username == username).one()
except NoResultFound:
logger.info("No such user: {0}".format(username))
return self._failed_response()
except MultipleResultsFound:
raise DBCorruptionError()
uauth = user.auth
if uauth is None:
raise DBCorruptionError()
if not uauth.check_password(password):
logger.info("Incorrect password: {0}".format(password))
return self._failed_response()
else:
logger.info("Logged in sucessfully: {0}".format(username))
uauth.regen_token()
#logger.info("New token generated: " + get_hex(uauth.token))
self.session.commit()
# STATUS | USER_TOKEN
reply = struct.pack("!B32s", _StatusCode.sucess, uauth.token)
# USER_ENTRY
reply += RequestHandler.pack_user_entry(user)
reply += RequestHandler.pack_sub_list(user)
return self.pack(reply)
class UpdateLocationHandler(RequestHandler):
_optcode = _OptCode.update_location
_max_tr_data_size = _MAX_AUTH_HEAD_SIZE + \
_SectionSize.LATITUDE + \
_SectionSize.LONGITUDE
def handle(self, tr_data, conn):
self.check_size(tr_data)
logger.info("Reading location update data...")
try:
token, = struct.unpack("!32s", tr_data[:32])
username, tail = RequestHandler.trunc_padding(tr_data[32:])
if username is None:
raise struct.error
lat, lng = struct.unpack("!dd", tail)
except struct.error:
raise BadReqError("Update location: Malformed request body")
logger.info("Trying to update location with "
"(token = {0}, username = {1}, lat = {2}, lng = {3})"\
.format(get_hex(token), username, lat, lng))
uauth = RequestHandler.get_uauth(token, username, self.session)
# Authentication failure
if uauth is None:
logger.warning("Authentication failure")
return self.pack(struct.pack("!B", _StatusCode.failure))
loc = uauth.user.location
loc.lat = lat
loc.lng = lng
self.session.commit()
logger.info("Location is updated sucessfully")
pt = RequestHandler.push_tunnels
u = uauth.user
comp = self.session.query(GroupInfo) \
.filter(GroupInfo.id == u.comp_id).one()
sec = self.session.query(GroupInfo) \
.filter(GroupInfo.id == u.sec_id).one()
pdata = PushLocationData(u.id, lat, lng)
for user in comp.subscribers:
uid = user.id
if uid == uauth.uid: continue
if pt.has_key(uid):
tunnel = pt[uid]
tunnel.add(pdata)
tunnel.push()
for user in sec.subscribers:
uid = user.id
if uid == uauth.uid: continue
if pt.has_key(uid):
tunnel = pt[uid]
tunnel.add(pdata)
tunnel.push()
return self.pack(struct.pack("!B", _StatusCode.sucess))
class UserInfoHandler(RequestHandler):
_optcode = _OptCode.user_info
_max_tr_data_size = _MAX_AUTH_HEAD_SIZE + \
_SectionSize.GROUP_ID
_failed_response = \
lambda self : self.pack(struct.pack("!B", _StatusCode.failure))
def handle(self, tr_data, conn):
self.check_size(tr_data)
logger.info("Reading user info request data...")
try:
token, = struct.unpack("!32s", tr_data[:32])
username, tail = RequestHandler.trunc_padding(tr_data[32:])
if username is None:
raise struct.error
gid, = struct.unpack("!H", tail)
except struct.error:
raise BadReqError("User info request: Malformed request body")
logger.info("Trying to get user info with " \
"(token = {0}, gid = {1})" \
.format(get_hex(token), gid))
uauth = RequestHandler.get_uauth(token, username, self.session)
# Auth failure
if uauth is None:
logger.warning("Authentication failure")
return self._failed_response()
# TODO: check the relationship between user and quser
u = uauth.user
grp = self.session.query(UserModel) \
.filter(UserModel.sec_id == gid).all()
grp += self.session.query(UserModel) \
.filter(UserModel.comp_id == gid).all()
reply = struct.pack("!B", _StatusCode.sucess)
for user in grp:
reply += RequestHandler.pack_user_entry(user)
return self.pack(reply)
class UpdateSubscription(RequestHandler):
_optcode = _OptCode.update_subscription
_max_tr_data_size = _MAX_AUTH_HEAD_SIZE + \
_SectionSize.GROUP_ID * _MAX_SUB_LIST_SIZE + \
_SectionSize.PADDING
def _find_group(self, gid):
q = self.session.query(GroupInfo).filter(GroupInfo.id == gid)
entry = q.first()
if not entry:
raise BadReqError("Group not found")
self.session.commit()
return entry
def handle(self, tr_data, conn):
print _MAX_AUTH_HEAD_SIZE
print _SectionSize.GROUP_ID * _MAX_SUB_LIST_SIZE
print _SectionSize.PADDING
self.check_size(tr_data)
logger.info("Reading update subscription data...")
try:
token, = struct.unpack("!32s", tr_data[:32])
username, tail = RequestHandler.trunc_padding(tr_data[32:])
if username is None:
raise struct.error
sub_list = RequestHandler.unpack_sub_list(tail)
except struct.error:
raise BadReqError("Update Subscription: Malformed request body")
logger.info("Trying to update subscription with "
"(token = {0}, username = {1}, grps = {2})"\
.format(get_hex(token), username, str(sub_list)))
uauth = RequestHandler.get_uauth(token, username, self.session)
# Authentication failure
if uauth is None:
logger.warning("Authentication failure")
return self.pack(struct.pack("!B", _StatusCode.failure))
uauth.user.sub = map(self._find_group, sub_list)
self.session.commit()
logger.info("Subscription is updated sucessfully")
return self.pack(struct.pack("!B", _StatusCode.sucess))
class UserLogoutHandler(RequestHandler):
_optcode = _OptCode.user_logout
_max_tr_data_size = _MAX_AUTH_HEAD_SIZE
def handle(self, tr_data, conn):
self.check_size(tr_data)
logger.info("Reading user logout data...")
try:
token, = struct.unpack("!32s", tr_data[:32])
username, tail = RequestHandler.trunc_padding(tr_data[32:])
if username is None:
raise struct.error
except struct.error:
raise BadReqError("User logout: Malformed request body")
logger.info("Trying to logout with "
"(token = {0}, username = {1})"\
.format(get_hex(token), username))
uauth = RequestHandler.get_uauth(token, username, self.session)
# Authentication failure
if uauth is None:
logger.warning("Authentication failure")
return self.pack(struct.pack("!B", _StatusCode.failure))
pt = RequestHandler.push_tunnels
uid = uauth.uid
pt[uid].close()
del pt[uid]
uauth.regen_token()
logger.info("User Logged out successfully!")
self.session.commit()
return self.pack(struct.pack("!B", _StatusCode.sucess))
class OpenPushTunnelHandler(RequestHandler):
_optcode = _OptCode.open_push_tunnel
_max_tr_data_size = _MAX_AUTH_HEAD_SIZE
def handle(self, tr_data, conn):
self.check_size(tr_data)
logger.info("Reading open push tunnel data...")
try:
token, = struct.unpack("!32s", tr_data[:32])
username, tail = RequestHandler.trunc_padding(tr_data[32:])
if username is None:
raise struct.error
except struct.error:
raise BadReqError("Open push tunnel: Malformed request body")
logger.info("Trying to open push tunnel with "
"(token = {0}, username = {1})"\
.format(get_hex(token), username))
uauth = RequestHandler.get_uauth(token, username, self.session)
# Authentication failure
if uauth is None:
logger.warning("Authentication failure")
return self.pack(struct.pack("!B", _StatusCode.failure))
tunnel = RequestHandler.push_tunnels[uauth.uid]
pt = RequestHandler.push_tunnels
uid = uauth.uid
if pt.has_key(uid):
tunnel = pt[uid]
tunnel.connect(conn)
logger.info("Push tunnel opened successfully!")
return self.pack(struct.pack("!B", _StatusCode.sucess))
class SendTextMessageHandler(RequestHandler):
_optcode = _OptCode.send_text_mesg
_max_tr_data_size = _MAX_AUTH_HEAD_SIZE + \
_MAX_TEXT_MESG_SIZE + \
_SectionSize.PADDING
def handle(self, tr_data, conn):
self.check_size(tr_data)
logger.info("Reading send text mesg data...")
try:
token, = struct.unpack("!32s", tr_data[:32])
username, tail = RequestHandler.trunc_padding(tr_data[32:])
mesg = tail[:-1]
if username is None:
raise struct.error
except struct.error:
raise BadReqError("Send text mesg: Malformed request body")
logger.info("Trying to send text mesg with "
"(token = {0}, username = {1})"\
.format(get_hex(token), username))
uauth = RequestHandler.get_uauth(token, username, self.session)
# Authentication failure
if uauth is None:
logger.warning("Authentication failure")
return self.pack(struct.pack("!B", _StatusCode.failure))
pt = RequestHandler.push_tunnels
u = uauth.user
ulist = self.session.query(UserModel) \
.filter(UserModel.sec_id == u.sec_id).all()
for user in ulist:
uid = user.id
if uid == uauth.uid: continue
if pt.has_key(uid):
tunnel = pt[uid]
tunnel.add(PushTextMesgData(mesg))
tunnel.push()
logger.info("Sent text mesg successfully!")
return self.pack(struct.pack("!B", _StatusCode.sucess))
class PTP(Protocol, TimeoutMixin):
handlers = [UserAuthHandler,
UpdateLocationHandler,
UserInfoHandler,
UpdateSubscription,
UserLogoutHandler,
OpenPushTunnelHandler,
SendTextMessageHandler]
handler_num = len(handlers)
_MAX_REQUEST_SIZE = _HEADER_SIZE + \
max([h._max_tr_data_size for h in handlers])
@classmethod
def check_header(cls, header):
return 0 <= header < cls.handler_num
def __init__(self, factory):
self.buff = bytes()
self.length = -1
self.factory = factory
self.tunnel = None
def timeoutConnection(self):
logger.info("The connection times out")
self.transport.loseConnection()
def connectionMade(self):
logger.info("A new connection is made")
self.setTimeout(self.factory.timeout)
def dataReceived(self, data):
self.buff += data
self.resetTimeout()
logger.info("Buffer length is now: %d", len(self.buff))
if len(self.buff) <= 4:
return
try:
if self.length == -1:
try:
self.length, self.optcode = struct.unpack("!LB", self.buff[:5])
if not PTP.check_header(self.optcode): # invalid header
raise struct.error
except struct.error:
raise BadReqError("Malformed request header")
if self.length > PTP._MAX_REQUEST_SIZE:
print self.length, PTP._MAX_REQUEST_SIZE
raise BadReqError("The size of remaining part is too big")
if len(self.buff) >= self.length:
buff = self.buff[:self.length]
self.buff = self.buff[self.length:]
if self.tunnel: # received push response
self.tunnel.on_receive(buff)
self.length = -1
return
h = PTP.handlers[self.optcode]()
reply = h.handle(buff[5:], self)
logger.info("Wrote: %s", get_hex(reply))
self.transport.write(reply)
if self.tunnel:
logger.info("Blocking the client...")
self.tunnel.push()
self.length = -1
self.setTimeout(None)
return
self.transport.loseConnection()
except BadReqError as e:
logger.warn("Rejected a bad request: %s", str(e))
self.transport.loseConnection()
except DBCorruptionError:
logger.error("*** Database corruption ***")
self.transport.loseConnection()
if self.tunnel is None:
self.transport.loseConnection()
def connectionLost(self, reason):
if self.tunnel:
self.tunnel.on_connection_lost(self)
logger.info("The connection is lost")
self.setTimeout(None)
class PTPFactory(Factory):
def __init__(self, timeout = 10):
self.timeout = timeout
def buildProtocol(self, addr):
return PTP(self)
if os.name!='nt':
from twisted.internet import epollreactor
epollreactor.install()
else:
from twisted.internet import iocpreactor
iocpreactor.install()
from twisted.internet import reactor
f = PTPFactory()
f.protocol = PTP
reactor.listenTCP(2223, f)
logger.warning("The server is lanuched")
reactor.run()
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