path: root/server/piztor_server.py

import sqlalchemy
import SocketServer, socket, select
import struct
import os

from sqlalchemy import create_engine
from sqlalchemy import Column, Integer, String, Float
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from random import randint

engine = create_engine('sqlite:///t.sqlite', echo = False)
Base = declarative_base()
Session = sessionmaker(bind=engine)

def get_hex(data):
    return "".join([hex(ord(c))[2:].zfill(2) for c in data])

class PiztorError(Exception):
    def __init__(self, msg):
        self.err_msg = msg
    def __str__(self, msg):
        return self.err_msg

class ConnectionError(PiztorError):
    pass

class ReqReadError(ConnectionError):
    def __init__(self):
        super(ReqReadError, self).__init__("Error while reading request")

class ReqInvalidError(ConnectionError):
    def __init__(self):
        super(ReqInvalidError, self).__init__("Invalid request")

class TokenInvalidError(ConnectionError):
    def __init__(self):
        super(TokenInvalidError, self).__init__("Invalid token")

class DataManager(object):
    def __init__(self, piz_srv):
        self.piz_srv = piz_srv

class UserManager(DataManager):

    class User(Base):
        __tablename__ = 'users'
        id = Column(Integer, primary_key = True)
        gid = Column(Integer)
        username = Column(String)
        password = Column(String)
        token = Column(Integer)

    def get_user_by_token(self, token):
        session = Session()
        User = UserManager.User
        entries = session.query(User).filter(User.token == token).all()
        if len(entries) == 0:
            raise TokenInvalidError()
        return entries[0]

    def authentication_handle(self, opt_type, data):
        print "Parsing User Data"
        pos = -1
        for i in xrange(0, len(data)):
            if data[i] == '\0':
                print i
                if pos != -1:
                    raise ReqInvalidError()
                pos = i
                break
        if pos == -1:
            raise ReqInvalidError()
        username = data[0:pos]  
        password = data[pos + 1:]

        print "Trying to login with following info:"
        print (username, password)
        
        session = Session()
        entries = session.query(UserManager.User). \
            filter(UserManager.User.username == username).all()
        if len(entries) == 0:
            return struct.pack("!BLB", 0, 0, 1)
        entry = entries[0]
        if entry.password != password:  # Auth failed
            print "Login failed!"
            return struct.pack("!BLB", 0, 0, 1)
        else:                           # Succeeded
            print "Logged in sucessfully!"
            entry.token = randint(0, 2147483647)
            session.commit()
            return struct.pack("!BLB", 0, entry.token, 0)
        

class MesgManager(DataManager):
    def mesg_sending_handle(self, opt_type, data):
        print "Parsing Mesg Data"
        try:
            if len(data) < 8:
                raise ReqInvalidError()
            sender_token, recv_id = struct.unpack("!LL", data[:8])
            msg = data[8:]
            print (sender_token, recv_id, msg)
            return struct.pack("!B",