240 lines
8.3 KiB
Python
240 lines
8.3 KiB
Python
from __future__ import print_function
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import logging
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import os
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import signal
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import sys
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import time
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import re
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from six.moves import configparser
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from contextlib import contextmanager
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if False:
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from mypy_extensions import NoReturn
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from typing import Any, Optional, List, Dict
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from types import ModuleType
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from zulip import Client
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def exit_gracefully(signum, frame):
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# type: (int, Optional[Any]) -> None
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sys.exit(0)
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def get_bot_logo_path(name):
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# type: str -> Optional[str]
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current_dir = os.path.dirname(os.path.abspath(__file__))
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logo_path_png = os.path.join(
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current_dir, 'bots/{bot_name}/logo.png'.format(bot_name=name))
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logo_path_svg = os.path.join(
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current_dir, 'bots/{bot_name}/logo.svg'.format(bot_name=name))
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if os.path.isfile(logo_path_png):
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return logo_path_png
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elif os.path.isfile(logo_path_svg):
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return logo_path_svg
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return None
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def get_bots_directory_path():
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# type: () -> str
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current_dir = os.path.dirname(os.path.abspath(__file__))
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return os.path.join(current_dir, 'bots')
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def get_bot_doc_path(name):
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# type: (str) -> str
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return os.path.join(get_bots_directory_path(), '{}/doc.md'.format(name))
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class RateLimit(object):
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def __init__(self, message_limit, interval_limit):
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# type: (int, int) -> None
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self.message_limit = message_limit
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self.interval_limit = interval_limit
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self.message_list = [] # type: List[float]
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self.error_message = '-----> !*!*!*MESSAGE RATE LIMIT REACHED, EXITING*!*!*! <-----\n'
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'Is your bot trapped in an infinite loop by reacting to its own messages?'
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def is_legal(self):
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# type: () -> bool
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self.message_list.append(time.time())
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if len(self.message_list) > self.message_limit:
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self.message_list.pop(0)
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time_diff = self.message_list[-1] - self.message_list[0]
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return time_diff >= self.interval_limit
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else:
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return True
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def show_error_and_exit(self):
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# type: () -> NoReturn
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logging.error(self.error_message)
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sys.exit(1)
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class ExternalBotHandler(object):
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def __init__(self, client, root_dir):
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# type: (Client, string) -> None
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# Only expose a subset of our Client's functionality
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user_profile = client.get_profile()
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self._rate_limit = RateLimit(20, 5)
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self._client = client
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self._root_dir = root_dir
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try:
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self.user_id = user_profile['user_id']
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self.full_name = user_profile['full_name']
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self.email = user_profile['email']
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except KeyError:
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logging.error('Cannot fetch user profile, make sure you have set'
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' up the zuliprc file correctly.')
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sys.exit(1)
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def send_message(self, message):
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# type: (Dict[str, Any]) -> Dict[str, Any]
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if self._rate_limit.is_legal():
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return self._client.send_message(message)
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else:
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self._rate_limit.show_error_and_exit()
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def send_reply(self, message, response):
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# type: (Dict[str, Any], str) -> Dict[str, Any]
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if message['type'] == 'private':
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return self.send_message(dict(
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type='private',
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to=[x['email'] for x in message['display_recipient'] if self.email != x['email']],
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content=response,
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))
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else:
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return self.send_message(dict(
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type='stream',
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to=message['display_recipient'],
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subject=message['subject'],
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content=response,
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))
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def update_message(self, message):
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# type: (Dict[str, Any]) -> Dict[str, Any]
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if self._rate_limit.is_legal():
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return self._client.update_message(message)
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else:
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self._rate_limit.show_error_and_exit()
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def get_config_info(self, bot_name, section=None, optional=False):
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# type: (str, Optional[str], Optional[bool]) -> Dict[str, Any]
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conf_file_path = os.path.realpath(os.path.join(self._root_dir, bot_name + '.conf'))
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section = section or bot_name
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config = configparser.ConfigParser()
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try:
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with open(conf_file_path) as conf:
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config.readfp(conf) # type: ignore
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except IOError:
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if optional:
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return dict()
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raise
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return dict(config.items(section))
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def open(self, filepath):
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# type: (str) -> None
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filepath = os.path.normpath(filepath)
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abs_filepath = os.path.join(self._root_dir, filepath)
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if abs_filepath.startswith(self._root_dir):
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return open(abs_filepath)
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else:
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raise PermissionError("Cannot open file \"{}\". Bots may only access "
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"files in their local directory.".format(abs_filepath))
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class StateHandler(object):
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def __init__(self):
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# type: () -> None
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self.state_ = None # type: Any
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def set_state(self, state):
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# type: (Any) -> None
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self.state_ = state
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def get_state(self):
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# type: () -> Any
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return self.state_
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@contextmanager
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def state(self, default):
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# type: (Any) -> Any
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new_state = self.get_state() or default
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yield new_state
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self.set_state(new_state)
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def extract_query_without_mention(message, client):
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# type: (Dict[str, Any], ExternalBotHandler) -> str
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"""
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If the bot is the first @mention in the message, then this function returns
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the message with the bot's @mention removed. Otherwise, it returns None.
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"""
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bot_mention = r'^@(\*\*{0}\*\*)'.format(client.full_name)
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start_with_mention = re.compile(bot_mention).match(message['content'])
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if start_with_mention is None:
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return None
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query_without_mention = message['content'][len(start_with_mention.group()):]
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return query_without_mention.lstrip()
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def is_private_message_from_another_user(message_dict, current_user_id):
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# type: (Dict[str, Any], int) -> bool
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"""
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Checks whether a message dict represents a PM from another user.
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This function is used by the embedded bot system in the
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zulip/zulip project, so refactor with care. See the comments in
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extract_query_without_mention.
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"""
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if message_dict['type'] == 'private':
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return current_user_id != message_dict['sender_id']
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return False
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def run_message_handler_for_bot(lib_module, quiet, config_file, bot_name):
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# type: (Any, bool, str) -> Any
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#
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# lib_module is of type Any, since it can contain any bot's
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# handler class. Eventually, we want bot's handler classes to
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# inherit from a common prototype specifying the handle_message
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# function.
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#
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# Make sure you set up your ~/.zuliprc
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client = Client(config_file=config_file, client="Zulip{}Bot".format(bot_name.capitalize()))
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bot_dir = os.path.dirname(lib_module.__file__)
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restricted_client = ExternalBotHandler(client, bot_dir)
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message_handler = lib_module.handler_class()
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if hasattr(message_handler, 'initialize'):
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message_handler.initialize(bot_handler=restricted_client)
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state_handler = StateHandler()
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if not quiet:
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print(message_handler.usage())
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def handle_message(message):
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# type: (Dict[str, Any]) -> None
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logging.info('waiting for next message')
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# is_mentioned is true if the bot is mentioned at ANY position (not necessarily
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# the first @mention in the message).
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is_mentioned = message['is_mentioned']
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is_private_message = is_private_message_from_another_user(message, restricted_client.user_id)
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# Strip at-mention botname from the message
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if is_mentioned:
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# message['content'] will be None when the bot's @-mention is not at the beginning.
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# In that case, the message shall not be handled.
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message['content'] = extract_query_without_mention(message=message, client=restricted_client)
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if message['content'] is None:
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return
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if is_private_message or is_mentioned:
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message_handler.handle_message(
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message=message,
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bot_handler=restricted_client,
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state_handler=state_handler
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)
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signal.signal(signal.SIGINT, exit_gracefully)
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logging.info('starting message handling...')
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client.call_on_each_message(handle_message)
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