import re
from typing import Type, Optional, Union, List
from platypush.backend import Backend
from platypush.context import get_plugin
from platypush.message.event.chat.telegram import MessageEvent, CommandMessageEvent, TextMessageEvent, \
PhotoMessageEvent, VideoMessageEvent, ContactMessageEvent, DocumentMessageEvent, LocationMessageEvent, \
GroupChatCreatedEvent
from platypush.plugins.chat.telegram import ChatTelegramPlugin
[docs]class ChatTelegramBackend(Backend):
"""
Telegram bot that listens for messages and updates.
Triggers:
* :class:`platypush.message.event.chat.telegram.TextMessageEvent` when a text message is received.
* :class:`platypush.message.event.chat.telegram.PhotoMessageEvent` when a photo is received.
* :class:`platypush.message.event.chat.telegram.VideoMessageEvent` when a video is received.
* :class:`platypush.message.event.chat.telegram.LocationMessageEvent` when a location is received.
* :class:`platypush.message.event.chat.telegram.ContactMessageEvent` when a contact is received.
* :class:`platypush.message.event.chat.telegram.DocumentMessageEvent` when a document is received.
* :class:`platypush.message.event.chat.telegram.CommandMessageEvent` when a command message is received.
* :class:`platypush.message.event.chat.telegram.GroupCreatedEvent` when the bot is invited to a new group.
Requires:
* The :class:`platypush.plugins.chat.telegram.ChatTelegramPlugin` plugin configured
"""
[docs] def __init__(self, authorized_chat_ids: Optional[List[Union[str, int]]] = None, **kwargs):
"""
:param authorized_chat_ids: Optional list of chat_id/user_id which are authorized to send messages to
the bot. If nothing is specified then no restrictions are applied.
"""
super().__init__(**kwargs)
self.authorized_chat_ids = set(authorized_chat_ids or [])
self._plugin: ChatTelegramPlugin = get_plugin('chat.telegram')
def _authorize(self, msg):
if not self.authorized_chat_ids:
return
if msg.chat.type == 'private' and msg.chat.id not in self.authorized_chat_ids:
self.logger.info('Received message from unauthorized chat_id {}'.format(msg.chat.id))
self._plugin.send_message(chat_id=msg.chat.id, text='You are not allowed to send messages to this bot')
raise PermissionError
def _msg_hook(self, cls: Type[MessageEvent]):
# noinspection PyUnusedLocal
def hook(update, context):
msg = update.effective_message
try:
self._authorize(msg)
self.bus.post(cls(chat_id=update.effective_chat.id,
message=self._plugin.parse_msg(msg).output,
user=self._plugin.parse_user(update.effective_user).output))
except PermissionError:
pass
return hook
def _group_hook(self):
# noinspection PyUnusedLocal
def hook(update, context):
msg = update.effective_message
if msg.group_chat_created:
self.bus.post(GroupChatCreatedEvent(chat_id=update.effective_chat.id,
message=self._plugin.parse_msg(msg).output,
user=self._plugin.parse_user(update.effective_user).output))
elif msg.photo:
self._msg_hook(PhotoMessageEvent)(update, context)
elif msg.video:
self._msg_hook(VideoMessageEvent)(update, context)
elif msg.contact:
self._msg_hook(ContactMessageEvent)(update, context)
elif msg.location:
self._msg_hook(LocationMessageEvent)(update, context)
elif msg.document:
self._msg_hook(DocumentMessageEvent)(update, context)
elif msg.text:
if msg.text.startswith('/'):
self._command_hook()(update, context)
else:
self._msg_hook(TextMessageEvent)(update, context)
return hook
def _command_hook(self):
# noinspection PyUnusedLocal
def hook(update, context):
msg = update.effective_message
m = re.match('\s*/([0-9a-zA-Z_-]+)\s*(.*)', msg.text)
cmd = m.group(1).lower()
args = [arg for arg in re.split('\s+', m.group(2)) if len(arg)]
try:
self._authorize(msg)
self.bus.post(CommandMessageEvent(chat_id=update.effective_chat.id,
command=cmd,
cmdargs=args,
message=self._plugin.parse_msg(msg).output,
user=self._plugin.parse_user(update.effective_user).output))
except PermissionError:
pass
return hook
[docs] def run(self):
# noinspection PyPackageRequirements
from telegram.ext import MessageHandler, Filters
super().run()
telegram = self._plugin.get_telegram()
dispatcher = telegram.dispatcher
dispatcher.add_handler(MessageHandler(Filters.group, self._group_hook()))
dispatcher.add_handler(MessageHandler(Filters.text, self._msg_hook(TextMessageEvent)))
dispatcher.add_handler(MessageHandler(Filters.photo, self._msg_hook(PhotoMessageEvent)))
dispatcher.add_handler(MessageHandler(Filters.video, self._msg_hook(VideoMessageEvent)))
dispatcher.add_handler(MessageHandler(Filters.contact, self._msg_hook(ContactMessageEvent)))
dispatcher.add_handler(MessageHandler(Filters.location, self._msg_hook(LocationMessageEvent)))
dispatcher.add_handler(MessageHandler(Filters.document, self._msg_hook(DocumentMessageEvent)))
dispatcher.add_handler(MessageHandler(Filters.command, self._command_hook()))
self.logger.info('Initialized Telegram backend')
telegram.start_polling()
# vim:sw=4:ts=4:et:
