530 lines
17 KiB
Python
Executable file
530 lines
17 KiB
Python
Executable file
#!/usr/bin/env python3
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import sys
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import json
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import signal
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import threading
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import queue
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import pickle
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import time
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import traceback
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from urllib.parse import unquote as UrlUnquote
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import hashlib
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import fbchat
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from fbchat.models import *
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# ---- MESSAGE TYPES ----
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# ezbr -> external
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CONFIGURE = "configure"
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GET_USER = "get_user"
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SET_USER_INFO = "set_user_info"
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SET_ROOM_INFO = "set_room_info"
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JOIN = "join"
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INVITE = "invite"
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LEAVE = "leave"
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SEND = "send"
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CLOSE = "close"
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# external -> ezbr
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JOINED = "joined"
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LEFT = "left"
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USER_INFO_UPDATED = "user_info_updated"
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ROOM_INFO_UPDATED = "room_info_updated"
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EVENT = "event"
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CACHE_PUT = "cache_put"
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CACHE_GET = "cache_get"
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# reply messages
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# ezbr -> external: all must wait for a reply!
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# external -> ezbr: only CACHE_GET produces a reply
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REP_OK = "rep_ok"
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REP_ERROR = "rep_error"
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# Event types
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EVENT_JOIN = "join"
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EVENT_LEAVE = "leave"
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EVENT_MESSAGE = "message"
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EVENT_ACTION = "action"
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def mediaObjectOfURL(url):
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return {
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"filename": url.split("?")[0].split("/")[-1],
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"url": url,
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}
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def stripFbLinkPrefix(url):
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PREFIX = "https://l.facebook.com/l.php?u="
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if url[:len(PREFIX)] == PREFIX:
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return UrlUnquote(url[len(PREFIX):].split('&')[0])
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else:
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return url
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# ---- MESSENGER CLIENT CLASS THAT HANDLES EVENTS ----
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class MessengerBridgeClient(fbchat.Client):
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def __init__(self, *args, **kwargs):
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super(MessengerBridgeClient, self).__init__(*args, **kwargs)
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self.bridge = None
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def setBridge(self, bridge):
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self.bridge = bridge
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## Redirect all interesting events to Bridge
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def onMessage(self, *args, **kwargs):
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self.bridge.onMessage(*args, **kwargs)
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def onPeopleAdded(self, *args, **kwargs):
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self.bridge.onPeopleAdded(*args, **kwargs)
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def onPersonRemoved(self, *args, **kwargs):
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self.bridge.onPersonRemoved(*args, **kwargs)
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def onTitleChange(self, *args, **kwargs):
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self.bridge.onTitleChange(*args, **kwargs)
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# ---- SEPARATE THREADS FOR INITIAL SYNC & CLIENT LISTEN ----
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class SyncerThread(threading.Thread):
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def __init__(self, client, bridge, thread_queue, *args, **kwargs):
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super(SyncerThread, self).__init__(*args, **kwargs)
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self.client = client
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self.bridge = bridge
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self.thread_queue = thread_queue
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def run(self):
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while True:
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thread = self.thread_queue.get(block=True)
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sys.stderr.write("(python) fb thread: {}\n".format(thread))
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self.bridge.setup_joined_thread(thread)
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class ClientListenThread(threading.Thread):
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def __init__(self, client, *args, **kwargs):
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super(ClientListenThread, self).__init__(*args, **kwargs)
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self.client = client
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def run(self):
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sys.stderr.write("(python messenger) Start client.listen()\n")
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self.client.listen()
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# ---- MAIN LOOP THAT HANDLES REQUESTS FROM BRIDGE ----
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class MessengerBridge:
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def __init__(self):
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self.rev_uid = {}
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self.uid_map = {}
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self.others_joined_map = {}
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self.my_joined_rooms = {}
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self.init_backlog_length = 100
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def getUserId(self, user):
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retval = None
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if user.url is not None and not "?" in user.url:
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retval = user.url.split("/")[-1]
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else:
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retval = user.uid
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if user.uid not in self.uid_map:
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self.uid_map[user.uid] = retval
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self.rev_uid[retval] = user.uid
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user_info = {
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"display_name": user.name,
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}
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if user.photo is not None:
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user_info["avatar"] = mediaObjectOfURL(user.photo)
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self.write({
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"_type": USER_INFO_UPDATED,
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"user": self.getUserId(user),
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"data": user_info,
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})
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return retval
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def getUserIdFromUid(self, uid):
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if uid in self.uid_map:
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return self.uid_map[uid]
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else:
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user = self.client.fetchUserInfo(uid)[uid]
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return self.getUserId(user)
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def revUserId(self, user_id):
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if user_id in self.rev_uid:
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return self.rev_uid[user_id]
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else:
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return user_id
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def getUserShortName(self, user):
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if user.first_name != None:
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return user.first_name
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else:
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return user.name
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def run(self):
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self.client = None
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self.keep_running = True
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self.cache_gets = {}
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self.num = 0
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while self.keep_running:
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try:
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line = sys.stdin.readline()
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except KeyboardInterrupt:
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sys.stderr.write("(python messenger) shutting down")
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self.close()
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time.sleep(5)
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sys.exit(0)
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sys.stderr.write("(python) reading {}\n".format(line.strip()))
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cmd = json.loads(line)
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try:
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rep = self.handle_cmd(cmd)
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if rep is None:
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rep = {}
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if "_type" not in rep:
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rep["_type"] = REP_OK
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except Exception as e:
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sys.stderr.write("(python) {}\n".format(traceback.format_exc()))
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rep = {
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"_type": REP_ERROR,
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"error": "{}".format(e)
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}
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rep["_id"] = cmd["_id"]
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self.write(rep)
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def write(self, msg):
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msgstr = json.dumps(msg)
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sys.stderr.write("(python) writing {}\n".format(msgstr))
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sys.stdout.write(msgstr + "\n")
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sys.stdout.flush()
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def handle_cmd(self, cmd):
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ty = cmd["_type"]
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if ty == CONFIGURE:
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self.init_backlog_length = int(cmd["data"]["initial_backlog"])
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client_file = "/tmp/fbclient_" + hashlib.sha224(cmd["data"]["email"].encode("utf-8")).hexdigest()
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try:
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f = open(client_file, "rb")
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self.client = pickle.load(f)
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f.close()
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sys.stderr.write("(python messenger) using previous client: {}\n".format(client_file))
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except:
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self.client = None
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if self.client is None:
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email, password = cmd["data"]["email"], cmd["data"]["password"]
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self.client = MessengerBridgeClient(email=email, password=password, max_tries=1)
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if not self.client.isLoggedIn():
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return {"_type": "rep_error", "error": "Unable to login (?)"}
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try:
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f = open(client_file, "wb")
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pickle.dump(self.client, f)
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f.close()
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except:
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pass
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self.client.setBridge(self)
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self.my_user_id = self.getUserIdFromUid(self.client.uid)
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threads = self.client.fetchThreadList()
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# ensure we have a correct mapping for bridged user IDs to fb uids
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# (this should be fast)
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for thread in threads:
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if thread.type == ThreadType.USER:
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self.getUserId(thread)
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self.sync_thread_queue = queue.Queue(100)
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SyncerThread(self.client, self, self.sync_thread_queue).start()
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for thread in threads:
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self.sync_thread_queue.put(thread)
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ClientListenThread(self.client).start()
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elif ty == CLOSE:
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self.close()
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elif ty == GET_USER:
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return {"_type": REP_OK, "user": self.my_user_id}
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elif ty == JOIN:
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self.ensure_i_joined(cmd["room"])
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elif ty == LEAVE:
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thread_id = cmd["room"]
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self.client.removeUserFromGroup(self.client.uid, thread_id)
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if thread_id in self.my_joined_rooms:
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del self.my_joined_rooms[thread_id]
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elif ty == INVITE:
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if cmd["room"] != "":
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uid = self.revUserId(cmd["user"])
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self.client.addUsersToGroup([uid], cmd["room"])
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elif ty == SEND:
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event = cmd["data"]
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if event["type"] in [EVENT_MESSAGE, EVENT_ACTION]:
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attachments = []
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if "attachments" in event and isinstance(event["attachments"], list):
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for at in event["attachments"]:
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if "url" in at:
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attachments.append(at["url"])
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else:
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# TODO
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sys.stdout.write("Unhandled: attachment without URL")
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msg = Message(event["text"])
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if event["type"] == EVENT_ACTION:
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msg.text = "* " + event["text"]
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if event["room"] != "":
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if len(attachments) > 0:
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msg_id = self.client.sendRemoteFiles(attachments, message=msg, thread_id=event["room"], thread_type=ThreadType.GROUP)
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else:
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msg_id = self.client.send(msg, thread_id=event["room"], thread_type=ThreadType.GROUP)
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elif event["recipient"] != "":
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uid = self.revUserId(event["recipient"])
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sys.stderr.write("(python) Sending to {}\n".format(uid))
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if len(attachments) > 0:
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msg_id = self.client.sendRemoteFiles(attachments, message=msg, thread_id=uid, thread_type=ThreadType.USER)
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else:
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msg_id = self.client.send(msg, thread_id=uid, thread_type=ThreadType.USER)
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else:
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return {"_type": REP_ERROR, "error": "Invalid message"}
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return {"_type": REP_OK, "event_id": msg_id}
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elif ty == REP_OK and cmd["_id"] in self.cache_gets:
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self.cache_gets[cmd["_id"]].put(cmd["value"])
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else:
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return {"_type": REP_ERROR, "error": "Not implemented"}
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def close(self):
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self.keep_running = False
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self.client.stopListening()
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def cache_get(self, key):
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self.num += 1
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num = self.num
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q = queue.Queue(1)
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self.cache_gets[num] = q
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self.write({"_type": CACHE_GET, "_id": num, "key": key})
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try:
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rep = q.get(block=True, timeout=30)
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except queue.Empty:
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rep = ""
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del self.cache_gets[num]
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return rep
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def cache_put(self, key, value):
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self.write({"_type": CACHE_PUT, "key": key, "value": value})
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# ---- Info sync ----
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def ensure_i_joined(self, thread_id):
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if thread_id not in self.my_joined_rooms:
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self.my_joined_rooms[thread_id] = True
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thread = self.client.fetchThreadInfo(thread_id)[thread_id]
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self.sync_thread_queue.put(thread)
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def setup_joined_thread(self, thread):
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sys.stderr.write("(python) setup_joined_thread {}".format(thread))
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if thread.type == ThreadType.GROUP:
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members = self.client.fetchAllUsersFromThreads([thread])
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self.write({
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"_type": JOINED,
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"room": thread.uid,
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})
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self.send_room_info(thread, members)
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self.send_room_members(thread, members)
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self.backlog_room(thread)
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def send_room_info(self, thread, members):
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members.sort(key=lambda m: m.uid)
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room_info = {}
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if thread.name is not None:
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room_info["name"] = thread.name
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else:
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who = [m for m in members if m.uid != self.client.uid]
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if len(who) > 3:
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room_info["name"] = ", ".join([self.getUserShortName(m) for m in who[:3]] + ["..."])
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else:
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room_info["name"] = ", ".join([self.getUserShortName(m) for m in who])
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if thread.photo is not None:
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room_info["picture"] = mediaObjectOfURL(thread.photo)
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else:
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for m in members:
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if m.uid != self.client.uid and m.photo is not None:
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room_info["picture"] = mediaObjectOfURL(m.photo)
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break
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self.write({
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"_type": ROOM_INFO_UPDATED,
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"room": thread.uid,
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"data": room_info,
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})
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def send_room_members(self, thread, members):
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for member in members:
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sys.stderr.write("(python) fb thread member: {}\n".format(member))
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self.ensureJoined(self.getUserId(member), thread.uid)
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def backlog_room(self, thread):
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prev_last_seen = self.cache_get("last_seen_%s"%thread.uid)
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if prev_last_seen == "":
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prev_last_seen = None
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messages = []
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found = False
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while not found:
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before = None
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if len(messages) > 0:
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before = messages[-1].timestamp
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page = self.client.fetchThreadMessages(thread.uid, before=before, limit=20)
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for m in page:
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if m.uid == prev_last_seen or len(messages) > self.init_backlog_length:
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found = True
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break
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else:
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messages.append(m)
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for m in reversed(messages):
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if m.text is None:
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m.text = ""
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m.text = "[{}] {}".format(
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time.strftime("%Y-%m-%d %H:%M %Z", time.localtime(float(m.timestamp)/1000)).strip(),
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m.text)
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self.onMessage(thread_id=thread.uid,
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thread_type=thread.type,
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message_object=m)
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def ensureJoined(self, userId, room):
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key = "{}--{}".format(userId, room)
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if not key in self.others_joined_map:
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self.write({
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"_type": EVENT,
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"data": {
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"type": EVENT_JOIN,
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"author": userId,
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"room": room,
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}
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})
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self.others_joined_map[key] = True
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# ---- Event handlers ----
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def onMessage(self, thread_id, thread_type, message_object, **kwargs):
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self.ensure_i_joined(thread_id)
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if message_object.author == self.client.uid:
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# Ignore our own messages
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return
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sys.stderr.write("(python messenger) Got message: {}\n".format(message_object))
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author = self.getUserIdFromUid(message_object.author)
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event = {
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"id": message_object.uid,
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"type": EVENT_MESSAGE,
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"author": author,
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"text": message_object.text,
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"attachments": []
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}
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if event["text"] is None:
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event["text"] = ""
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for at in message_object.attachments:
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if isinstance(at, ImageAttachment):
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full_url = self.client.fetchImageUrl(at.uid)
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event["attachments"].append({
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"filename": full_url.split("?")[0].split("/")[-1],
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"url": full_url,
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"image_size": {
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"width": at.width,
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"height": at.height,
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},
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})
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elif isinstance(at, FileAttachment):
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url = stripFbLinkPrefix(at.url)
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event["attachments"].append({
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"filename": at.name,
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"url": url,
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})
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elif isinstance(at, AudioAttachment):
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url = stripFbLinkPrefix(at.url)
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event["attachments"].append({
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"filename": at.filename,
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"url": url,
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})
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else:
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event["text"] += "\nUnhandled attachment: {}".format(at)
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if thread_type == ThreadType.GROUP:
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event["room"] = thread_id
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self.ensureJoined(author, thread_id)
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if event["text"] != "" or len(event["attachments"]) > 0:
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self.write({"_type": EVENT, "data": event})
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self.cache_put("last_seen_%s"%thread_id, message_object.uid)
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def onPeopleAdded(self, added_ids, thread_id, *args, **kwargs):
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for user_id in added_ids:
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if user_id == self.client.uid:
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self.ensure_i_joined(thread_id)
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else:
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self.ensureJoined(self.getUserIdFromUid(user_id), thread_id)
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def onPersonRemoved(self, removed_id, thread_id, *args, **kwargs):
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if removed_id == self.client.uid:
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self.write({
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"_type": LEFT,
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"room": thread_id,
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})
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if thread_id in self.my_joined_rooms:
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del self.my_joined_rooms[thread_id]
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else:
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userId = self.getUserIdFromUid(removed_id),
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self.write({
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"_type": EVENT,
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"data": {
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"type": EVENT_JOIN,
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"author": userId,
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"room": thread_id,
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}
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})
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map_key = "{}--{}".format(userId, thread_id)
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if map_key in self.others_joined_map:
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del self.others_joined_map[map_key]
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def onTitleChange(self, author_id, new_title, thread_id, thread_type, *args, **kwargs):
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self.ensure_i_joined(thread_id)
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if thread_type == ThreadType.GROUP:
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self.write({
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"_type": ROOM_INFO_UPDATED,
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"room": thread_id,
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"data": {"name": new_title},
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})
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if __name__ == "__main__":
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bridge = MessengerBridge()
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bridge.run()
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