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server.py
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server.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# ----------------------------------------------------------------
# CChatServer
#
# Server for CChat.
# ----------------------------------------------------------------
# copyright (c) 2014 - Domen Ipavec
# ----------------------------------------------------------------
from socketserver import TCPServer, ThreadingMixIn, StreamRequestHandler, BaseServer
import ssl, socket, pickle, os, signal, re, threading
# how many alive messages can fail before client is considered offline
# multiplie by 5 to get seconds
CONST_ALIVE = 12
# initial users_temp structure
def initTemp():
return {
'online': False,
'alive': CONST_ALIVE
}
# override TCPServer __init__ to wrap with ssl
class CChatServer(ThreadingMixIn, TCPServer):
def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True):
BaseServer.__init__(self, server_address, RequestHandlerClass)
self.socket = ssl.wrap_socket(socket.socket(self.address_family, self.socket_type),
"./server.key", "./server.crt", True, ssl.CERT_REQUIRED,
ssl.PROTOCOL_TLSv1, "./trusted.crt")
if bind_and_activate:
self.server_bind()
self.server_activate()
# request handler
class CChatHandler(StreamRequestHandler):
# initialize handler
def setup(self):
self.connection = self.request
self.rfile = self.connection.makefile("rb", self.rbufsize)
self.wfile = self.connection.makefile("wb", self.wbufsize)
# handle connection
def handle(self):
# parse user data from certificate
self.user = {}
for item in self.connection.getpeercert(False)['subject']:
self.user[item[0][0]] = item[0][1]
self.userName = self.user['commonName']
# register user
if self.userName not in users:
users[self.userName] = {
'list': [],
}
users_temp[self.userName] = initTemp()
# login
users_temp[self.userName]['online'] = True
users_temp[self.userName]['handler'] = self
self.informFriends()
# send invites if present
if 'invites' in users[self.userName]:
for i in users[self.userName]['invites']:
self.sendInvite(i)
users[self.userName].pop('invites', None)
# start listening for commands
while True:
data = self.rfile.readline().strip().decode("utf-8")
if not data or data == 'exit':
break
self.split = data.split(':')
if not self.parseCommand():
break
# connection closed, set offline
users_temp[self.userName]['online'] = False
self.informFriends()
# cleanup
def finish(self):
if not self.wfile.closed:
self.wfile.flush()
self.wfile.close()
if not self.rfile.closed:
self.rfile.close()
# write string to output file
def writeStr(self, s):
self.wfile.write(bytes(s + '\n', 'utf-8'))
self.wfile.flush()
# inform friends on change of online status
def informFriends(self):
for friend in users[self.userName]['list']:
if self.userName in users[friend]['list'] \
and users_temp[friend]['online']:
users_temp[friend]['handler'].sendList()
# send invite
def sendInvite(self, user):
self.writeStr('invite:'+user)
# send list with online status
def sendList(self):
data = []
for user in users[self.userName]['list']:
data.append(user)
if self.userName in users[user]['list'] \
and users_temp[user]['online']:
data.append('1')
else:
data.append('0')
self.writeStr('list:' + ':'.join(data))
# parse received command
def parseCommand(self):
# send list with online status
if self.split[0] == 'list':
self.sendList()
# find users
elif self.split[0] == 'find':
prog = re.compile(r'(?i)' + self.split[1])
result = [user for user in users if user != self.userName and prog.search(user) is not None]
self.writeStr('find:' + ':'.join(result))
# add friend
elif self.split[0] == 'add':
friend = self.split[1]
if friend in users and friend not in users[self.userName]['list']:
users[self.userName]['list'].append(friend)
# update online status of friend
if self.userName in users[friend]['list']:
if users_temp[friend]['online']:
users_temp[friend]['handler'].sendList()
# send invite
else:
if users_temp[friend]['online']:
users_temp[friend]['handler'].sendInvite(self.userName)
else:
if 'invites' in users[friend]:
users[friend]['invites'].append(self.userName)
else:
users[friend]['invites'] = [self.userName]
# update my list
self.sendList()
# remove friend
elif self.split[0] == 'remove':
try:
friend = self.split[1]
users[self.userName]['list'].remove(friend)
self.sendList()
if self.userName in users[friend]['list'] \
and users_temp[friend]['online']:
users_temp[friend]['handler'].sendList()
except ValueError:
pass
# forward msg to friend
elif self.split[0] == 'msg':
friend = self.split[1]
if self.userName in users[friend]['list'] \
and users_temp[friend]['online']:
users_temp[friend]['handler'].writeStr('msg:'+self.userName + ':' + self.split[2])
# got alive reply
elif self.split[0] == 'alive':
users_temp[self.userName]['alive'] = CONST_ALIVE
return True
# send alive request to all online users every 5s
def keep_alive():
for user in users_temp:
if users_temp[user]['online']:
try:
users_temp[user]['handler'].writeStr('alive')
users_temp[user]['alive'] -= 1
if users_temp[user]['alive'] < 1:
users_temp[user]['online'] = False
users_temp[user]['handler'].informFriends()
except:
print("error")
t = threading.Timer(5.0, keep_alive)
t.setDaemon(True)
t.start()
def cchat_run():
global users_temp
global users
HOST, PORT = "89.212.118.128", 7094
USERSF = './users.dat'
TCPServer.allow_reuse_address = True
# load users structure from file and init users_temp
users_temp = {}
if os.path.isfile(USERSF):
users = pickle.load(open(USERSF, 'rb'))
for user in users:
users_temp[user] = initTemp()
else:
users = {}
# save users on exit
def handler(signum, frame):
pickle.dump(users, open(USERSF, 'wb'))
server.server_close()
signal.signal(signal.SIGTERM, handler)
# init server
server = CChatServer((HOST, PORT), CChatHandler)
server.daemon_threads = True
# start alive thread
keep_alive()
# start server
try:
server.serve_forever()
except KeyboardInterrupt:
handler(signal.SIGTERM, None)
# start program
if __name__ == "__main__":
cchat_run()