234 lines
9.7 KiB
Python
234 lines
9.7 KiB
Python
#!/usr/bin/env python3
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import configparser
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import logging
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import json
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import os
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import sys
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import importlib.util
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from collections import OrderedDict
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from configparser import MissingSectionHeaderError, NoOptionError
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from flask import Flask, request
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from importlib import import_module
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from typing import Any, Dict, List, Optional
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from types import ModuleType
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from werkzeug.exceptions import BadRequest, Unauthorized
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from zulip import Client
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from zulip_bots import lib
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from zulip_botserver.input_parameters import parse_args
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def read_config_section(parser: configparser.ConfigParser, section: str) -> Dict[str, str]:
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section_info = {
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"email": parser.get(section, 'email'),
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"key": parser.get(section, 'key'),
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"site": parser.get(section, 'site'),
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"token": parser.get(section, 'token'),
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}
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return section_info
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def read_config_from_env_vars(bot_name: Optional[str] = None) -> Dict[str, Dict[str, str]]:
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bots_config = {} # type: Dict[str, Dict[str, str]]
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json_config = os.environ.get('ZULIP_BOTSERVER_CONFIG')
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if json_config is None:
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raise OSError("Could not read environment variable 'ZULIP_BOTSERVER_CONFIG': Variable not set.")
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# Load JSON-formatted environment variable; use OrderedDict to
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# preserve ordering on Python 3.6 and below.
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env_config = json.loads(json_config, object_pairs_hook=OrderedDict)
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if bot_name is not None:
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if bot_name in env_config:
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bots_config[bot_name] = env_config[bot_name]
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else:
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# If the bot name provided via the command line does not
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# exist in the configuration provided via the environment
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# variable, use the first bot in the environment variable,
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# with name updated to match, along with a warning.
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first_bot_name = list(env_config.keys())[0]
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bots_config[bot_name] = env_config[first_bot_name]
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logging.warning(
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"First bot name in the config list was changed from '{}' to '{}'".format(first_bot_name, bot_name)
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)
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else:
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bots_config = dict(env_config)
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return bots_config
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def read_config_file(config_file_path: str, bot_name: Optional[str] = None) -> Dict[str, Dict[str, str]]:
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parser = parse_config_file(config_file_path)
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bots_config = {} # type: Dict[str, Dict[str, str]]
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if bot_name is None:
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bots_config = {section: read_config_section(parser, section)
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for section in parser.sections()}
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return bots_config
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logging.warning("Single bot mode is enabled")
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if len(parser.sections()) == 0:
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sys.exit("Error: Your Botserver config file `{0}` does not contain any sections!\n"
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"You need to write the name of the bot you want to run in the "
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"section header of `{0}`.".format(config_file_path))
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if bot_name in parser.sections():
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bot_section = bot_name
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bots_config[bot_name] = read_config_section(parser, bot_name)
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ignored_sections = [section for section in parser.sections() if section != bot_name]
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else:
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bot_section = parser.sections()[0]
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bots_config[bot_name] = read_config_section(parser, bot_section)
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logging.warning(
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"First bot name in the config list was changed from '{}' to '{}'".format(bot_section, bot_name)
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)
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ignored_sections = parser.sections()[1:]
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if len(ignored_sections) > 0:
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logging.warning("Sections except the '{}' will be ignored".format(bot_section))
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return bots_config
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def parse_config_file(config_file_path: str) -> configparser.ConfigParser:
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config_file_path = os.path.abspath(os.path.expanduser(config_file_path))
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if not os.path.isfile(config_file_path):
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raise OSError("Could not read config file {}: File not found.".format(config_file_path))
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parser = configparser.ConfigParser()
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parser.read(config_file_path)
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return parser
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# TODO: Could we use the function from the bots library for this instead?
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def load_module_from_file(file_path: str) -> ModuleType:
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# Wrapper around importutil; see https://stackoverflow.com/a/67692/3909240.
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spec = importlib.util.spec_from_file_location("custom_bot_module", file_path)
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lib_module = importlib.util.module_from_spec(spec)
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assert spec is not None
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assert spec.loader is not None
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spec.loader.exec_module(lib_module) # type: ignore # FIXME: typeshed issue?
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return lib_module
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def load_lib_modules(available_bots: List[str]) -> Dict[str, Any]:
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bots_lib_module = {}
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for bot in available_bots:
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try:
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if bot.endswith('.py') and os.path.isfile(bot):
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lib_module = load_module_from_file(bot)
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else:
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module_name = 'zulip_bots.bots.{bot}.{bot}'.format(bot=bot)
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lib_module = import_module(module_name)
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bots_lib_module[bot] = lib_module
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except ImportError:
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error_message = ("Error: Bot \"{}\" doesn't exist. Please make sure "
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"you have set up the botserverrc file correctly.\n".format(bot))
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if bot == "api":
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error_message += "Did you forget to specify the bot you want to run with -b <botname> ?"
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sys.exit(error_message)
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return bots_lib_module
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def load_bot_handlers(
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available_bots: List[str],
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bots_config: Dict[str, Dict[str, str]],
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third_party_bot_conf: Optional[configparser.ConfigParser] = None,
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) -> Dict[str, lib.ExternalBotHandler]:
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bot_handlers = {}
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for bot in available_bots:
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client = Client(email=bots_config[bot]["email"],
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api_key=bots_config[bot]["key"],
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site=bots_config[bot]["site"])
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bot_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'bots', bot)
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bot_handler = lib.ExternalBotHandler(
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client,
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bot_dir,
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bot_details={},
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bot_config_parser=third_party_bot_conf
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)
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bot_handlers[bot] = bot_handler
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return bot_handlers
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def init_message_handlers(
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available_bots: List[str],
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bots_lib_modules: Dict[str, Any],
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bot_handlers: Dict[str, lib.ExternalBotHandler],
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) -> Dict[str, Any]:
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message_handlers = {}
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for bot in available_bots:
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bot_lib_module = bots_lib_modules[bot]
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bot_handler = bot_handlers[bot]
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message_handler = lib.prepare_message_handler(bot, bot_handler, bot_lib_module)
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message_handlers[bot] = message_handler
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return message_handlers
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app = Flask(__name__)
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bots_config = {} # type: Dict[str, Dict[str, str]]
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@app.route('/', methods=['POST'])
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def handle_bot() -> str:
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event = request.get_json(force=True)
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for bot_name, config in bots_config.items():
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if config['email'] == event['bot_email']:
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bot = bot_name
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bot_config = config
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break
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else:
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raise BadRequest("Cannot find a bot with email {} in the Botserver "
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"configuration file. Do the emails in your botserverrc "
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"match the bot emails on the server?".format(event['bot_email']))
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if bot_config['token'] != event['token']:
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raise Unauthorized("Request token does not match token found for bot {} in the "
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"Botserver configuration file. Do the outgoing webhooks in "
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"Zulip point to the right Botserver?".format(event['bot_email']))
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app.config.get("BOTS_LIB_MODULES", {})[bot]
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bot_handler = app.config.get("BOT_HANDLERS", {})[bot]
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message_handler = app.config.get("MESSAGE_HANDLERS", {})[bot]
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is_mentioned = event['trigger'] == "mention"
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is_private_message = event['trigger'] == "private_message"
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message = event["message"]
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message['full_content'] = message['content']
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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'] = lib.extract_query_without_mention(message=message, client=bot_handler)
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if message['content'] is None:
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return json.dumps("")
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if is_private_message or is_mentioned:
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message_handler.handle_message(message=message, bot_handler=bot_handler)
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return json.dumps("")
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def main() -> None:
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options = parse_args()
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global bots_config
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if options.use_env_vars:
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bots_config = read_config_from_env_vars(options.bot_name)
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elif options.config_file:
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try:
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bots_config = read_config_file(options.config_file, options.bot_name)
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except MissingSectionHeaderError:
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sys.exit("Error: Your Botserver config file `{0}` contains an empty section header!\n"
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"You need to write the names of the bots you want to run in the "
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"section headers of `{0}`.".format(options.config_file))
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except NoOptionError as e:
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sys.exit("Error: Your Botserver config file `{0}` has a missing option `{1}` in section `{2}`!\n"
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"You need to add option `{1}` with appropriate value in section `{2}` of `{0}`"
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.format(options.config_file, e.option, e.section))
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available_bots = list(bots_config.keys())
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bots_lib_modules = load_lib_modules(available_bots)
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third_party_bot_conf = parse_config_file(options.bot_config_file) if options.bot_config_file is not None else None
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bot_handlers = load_bot_handlers(available_bots, bots_config, third_party_bot_conf)
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message_handlers = init_message_handlers(available_bots, bots_lib_modules, bot_handlers)
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app.config["BOTS_LIB_MODULES"] = bots_lib_modules
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app.config["BOT_HANDLERS"] = bot_handlers
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app.config["MESSAGE_HANDLERS"] = message_handlers
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app.run(host=options.hostname, port=int(options.port), debug=True)
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if __name__ == '__main__':
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main()
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