#!/usr/bin/env python3 import os import logging import signal import traceback import zulip import sys import argparse import re import configparser from collections import OrderedDict from types import FrameType from typing import Any, Callable, Dict, Optional from matrix_client.errors import MatrixRequestError from matrix_client.client import MatrixClient from requests.exceptions import MissingSchema GENERAL_NETWORK_USERNAME_REGEX = '@_?[a-zA-Z0-9]+_([a-zA-Z0-9-_]+):[a-zA-Z0-9.]+' MATRIX_USERNAME_REGEX = '@([a-zA-Z0-9-_]+):matrix.org' # change these templates to change the format of displayed message ZULIP_MESSAGE_TEMPLATE = "**{username}**: {message}" MATRIX_MESSAGE_TEMPLATE = "<{username}> {message}" class Bridge_ConfigException(Exception): pass class Bridge_FatalMatrixException(Exception): pass class Bridge_ZulipFatalException(Exception): pass def matrix_login(matrix_client: Any, matrix_config: Dict[str, Any]) -> None: try: matrix_client.login_with_password(matrix_config["username"], matrix_config["password"]) except MatrixRequestError as exception: if exception.code == 403: raise Bridge_FatalMatrixException("Bad username or password.") else: raise Bridge_FatalMatrixException("Check if your server details are correct.") except MissingSchema: raise Bridge_FatalMatrixException("Bad URL format.") def matrix_join_room(matrix_client: Any, matrix_config: Dict[str, Any]) -> Any: try: room = matrix_client.join_room(matrix_config["room_id"]) return room except MatrixRequestError as exception: if exception.code == 403: raise Bridge_FatalMatrixException("Room ID/Alias in the wrong format") else: raise Bridge_FatalMatrixException("Couldn't find room.") def die(signal: int, frame: FrameType) -> None: # We actually want to exit, so run os._exit (so as not to be caught and restarted) os._exit(1) def matrix_to_zulip( zulip_client: zulip.Client, zulip_config: Dict[str, Any], matrix_config: Dict[str, Any], no_noise: bool, ) -> Callable[[Any, Dict[str, Any]], None]: def _matrix_to_zulip(room: Any, event: Dict[str, Any]) -> None: """ Matrix -> Zulip """ content = get_message_content_from_event(event, no_noise) zulip_bot_user = ('@%s:matrix.org' % matrix_config['username']) # We do this to identify the messages generated from Zulip -> Matrix # and we make sure we don't forward it again to the Zulip stream. not_from_zulip_bot = ('body' not in event['content'] or event['sender'] != zulip_bot_user) if not_from_zulip_bot and content: try: result = zulip_client.send_message({ "type": "stream", "to": zulip_config["stream"], "subject": zulip_config["topic"], "content": content, }) except Exception as exception: # XXX This should be more specific # Generally raised when user is forbidden raise Bridge_ZulipFatalException(exception) if result['result'] != 'success': # Generally raised when API key is invalid raise Bridge_ZulipFatalException(result['msg']) return _matrix_to_zulip def get_message_content_from_event(event: Dict[str, Any], no_noise: bool) -> Optional[str]: irc_nick = shorten_irc_nick(event['sender']) if event['type'] == "m.room.member": if no_noise: return None # Join and leave events can be noisy. They are ignored by default. # To enable these events pass `no_noise` as `False` as the script argument if event['membership'] == "join": content = ZULIP_MESSAGE_TEMPLATE.format(username=irc_nick, message="joined") elif event['membership'] == "leave": content = ZULIP_MESSAGE_TEMPLATE.format(username=irc_nick, message="quit") elif event['type'] == "m.room.message": if event['content']['msgtype'] == "m.text" or event['content']['msgtype'] == "m.emote": content = ZULIP_MESSAGE_TEMPLATE.format(username=irc_nick, message=event['content']['body']) else: content = event['type'] return content def shorten_irc_nick(nick: str) -> str: """ Add nick shortner functions for specific IRC networks Eg: For freenode change '@freenode_user:matrix.org' to 'user' Check the list of IRC networks here: https://github.com/matrix-org/matrix-appservice-irc/wiki/Bridged-IRC-networks """ match = re.match(GENERAL_NETWORK_USERNAME_REGEX, nick) if match: return match.group(1) # For matrix users match = re.match(MATRIX_USERNAME_REGEX, nick) if match: return match.group(1) return nick def zulip_to_matrix(config: Dict[str, Any], room: Any) -> Callable[[Dict[str, Any]], None]: def _zulip_to_matrix(msg: Dict[str, Any]) -> None: """ Zulip -> Matrix """ message_valid = check_zulip_message_validity(msg, config) if message_valid: matrix_username = msg["sender_full_name"].replace(' ', '') matrix_text = MATRIX_MESSAGE_TEMPLATE.format(username=matrix_username, message=msg["content"]) # Forward Zulip message to Matrix room.send_text(matrix_text) return _zulip_to_matrix def check_zulip_message_validity(msg: Dict[str, Any], config: Dict[str, Any]) -> bool: is_a_stream = msg["type"] == "stream" in_the_specified_stream = msg["display_recipient"] == config["stream"] at_the_specified_subject = msg["subject"] == config["topic"] # We do this to identify the messages generated from Matrix -> Zulip # and we make sure we don't forward it again to the Matrix. not_from_zulip_bot = msg["sender_email"] != config["email"] if is_a_stream and not_from_zulip_bot and in_the_specified_stream and at_the_specified_subject: return True return False def generate_parser() -> argparse.ArgumentParser: description = """ Script to bridge between a topic in a Zulip stream, and a Matrix channel. Tested connections: * Zulip <-> Matrix channel * Zulip <-> IRC channel (bridged via Matrix) Example matrix 'room_id' options might be, if via matrix.org: * #zulip:matrix.org (zulip channel on Matrix) * #freenode_#zulip:matrix.org (zulip channel on irc.freenode.net)""" parser = argparse.ArgumentParser(description=description, formatter_class=argparse.RawTextHelpFormatter) parser.add_argument('-c', '--config', required=False, help="Path to the config file for the bridge.") parser.add_argument('--write-sample-config', metavar='PATH', dest='sample_config', help="Generate a configuration template at the specified location.") parser.add_argument('--from-zuliprc', metavar='ZULIPRC', dest='zuliprc', help="Optional path to zuliprc file for bot, when using --write-sample-config") parser.add_argument('--show-join-leave', dest='no_noise', default=True, action='store_false', help="Enable IRC join/leave events.") return parser def read_configuration(config_file: str) -> Dict[str, Dict[str, str]]: config = configparser.ConfigParser() try: config.read(config_file) except configparser.Error as exception: raise Bridge_ConfigException(str(exception)) if set(config.sections()) != {'matrix', 'zulip'}: raise Bridge_ConfigException("Please ensure the configuration has zulip & matrix sections.") # TODO Could add more checks for configuration content here return {section: dict(config[section]) for section in config.sections()} def write_sample_config(target_path: str, zuliprc: Optional[str]) -> None: if os.path.exists(target_path): raise Bridge_ConfigException("Path '{}' exists; not overwriting existing file.".format(target_path)) sample_dict = OrderedDict(( ('matrix', OrderedDict(( ('host', 'https://matrix.org'), ('username', 'username'), ('password', 'password'), ('room_id', '#zulip:matrix.org'), ))), ('zulip', OrderedDict(( ('email', 'glitch-bot@chat.zulip.org'), ('api_key', 'aPiKeY'), ('site', 'https://chat.zulip.org'), ('stream', 'test here'), ('topic', 'matrix'), ))), )) if zuliprc is not None: if not os.path.exists(zuliprc): raise Bridge_ConfigException("Zuliprc file '{}' does not exist.".format(zuliprc)) zuliprc_config = configparser.ConfigParser() try: zuliprc_config.read(zuliprc) except configparser.Error as exception: raise Bridge_ConfigException(str(exception)) # Can add more checks for validity of zuliprc file here sample_dict['zulip']['email'] = zuliprc_config['api']['email'] sample_dict['zulip']['site'] = zuliprc_config['api']['site'] sample_dict['zulip']['api_key'] = zuliprc_config['api']['key'] sample = configparser.ConfigParser() sample.read_dict(sample_dict) with open(target_path, 'w') as target: sample.write(target) def main() -> None: signal.signal(signal.SIGINT, die) logging.basicConfig(level=logging.WARNING) parser = generate_parser() options = parser.parse_args() if options.sample_config: try: write_sample_config(options.sample_config, options.zuliprc) except Bridge_ConfigException as exception: print("Could not write sample config: {}".format(exception)) sys.exit(1) if options.zuliprc is None: print("Wrote sample configuration to '{}'".format(options.sample_config)) else: print("Wrote sample configuration to '{}' using zuliprc file '{}'" .format(options.sample_config, options.zuliprc)) sys.exit(0) elif not options.config: print("Options required: -c or --config to run, OR --write-sample-config.") parser.print_usage() sys.exit(1) try: config = read_configuration(options.config) except Bridge_ConfigException as exception: print("Could not parse config file: {}".format(exception)) sys.exit(1) # Get config for each client zulip_config = config["zulip"] matrix_config = config["matrix"] # Initiate clients backoff = zulip.RandomExponentialBackoff(timeout_success_equivalent=300) while backoff.keep_going(): print("Starting matrix mirroring bot") try: zulip_client = zulip.Client(email=zulip_config["email"], api_key=zulip_config["api_key"], site=zulip_config["site"]) matrix_client = MatrixClient(matrix_config["host"]) # Login to Matrix matrix_login(matrix_client, matrix_config) # Join a room in Matrix room = matrix_join_room(matrix_client, matrix_config) room.add_listener(matrix_to_zulip(zulip_client, zulip_config, matrix_config, options.no_noise)) print("Starting listener thread on Matrix client") matrix_client.start_listener_thread() print("Starting message handler on Zulip client") zulip_client.call_on_each_message(zulip_to_matrix(zulip_config, room)) except Bridge_FatalMatrixException as exception: sys.exit("Matrix bridge error: {}".format(exception)) except Bridge_ZulipFatalException as exception: sys.exit("Zulip bridge error: {}".format(exception)) except zulip.ZulipError as exception: sys.exit("Zulip error: {}".format(exception)) except Exception: traceback.print_exc() backoff.fail() if __name__ == '__main__': main()