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