Support for group events and lists of authorized chat_ids

platypush/backend/chat/telegram.py

@@ -1,11 +1,12 @@
 import re
 
-from typing import Type
+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
+    PhotoMessageEvent, VideoMessageEvent, ContactMessageEvent, DocumentMessageEvent, LocationMessageEvent, \
+    GroupChatCreatedEvent
 from platypush.plugins.chat.telegram import ChatTelegramPlugin
 
 
@@ -22,6 +23,7 @@ class ChatTelegramBackend(Backend):
         * :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:
 
@@ -29,16 +31,63 @@ class ChatTelegramBackend(Backend):
 
     """
 
-    def __init__(self, **kwargs):
+    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):
-            self.bus.post(cls(chat_id=update.effective_chat.id,
-                              message=self._plugin.parse_msg(update.effective_message).output,
-                              user=self._plugin.parse_user(update.effective_user).output))
+            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
 
@@ -49,11 +98,16 @@ class ChatTelegramBackend(Backend):
             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)]
-            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))
+
+            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
 
@@ -65,6 +119,7 @@ class ChatTelegramBackend(Backend):
         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)))

platypush/message/event/chat/telegram.py

@@ -48,4 +48,8 @@ class DocumentMessageEvent(MessageEvent):
     pass
 
 
+class GroupChatCreatedEvent(MessageEvent):
+    pass
+
+
 # vim:sw=4:ts=4:et: