ChatMigrated exception (#353)

* ChatMigrated exception

AUTHORS.rst

@@ -22,6 +22,7 @@ The following wonderful people contributed directly or indirectly to this projec
 - `njittam <https://github.com/njittam>`_
 - `Noam Meltzer <https://github.com/tsnoam>`_
 - `Oleg Shlyazhko <https://github.com/ollmer>`_
+- `overquota <https://github.com/overquota>`_
 - `Rahiel Kasim <https://github.com/rahiel>`_
 - `Shelomentsev D <https://github.com/shelomentsevd>`_
 - `sooyhwang <https://github.com/sooyhwang>`_

telegram/error.py

@@ -85,3 +85,17 @@ class TimedOut(NetworkError):
 
     def __init__(self):
         super(TimedOut, self).__init__('Timed out')
+
+
+class ChatMigrated(TelegramError):
+
+    def __init__(self, new_chat_id):
+        """
+        Args:
+            new_chat_id (int):
+
+        Returns:
+
+        """
+        super(ChatMigrated, self).__init__('Chat migrated')
+        self.new_chat_id = new_chat_id

telegram/utils/request.py

@@ -28,7 +28,7 @@ import urllib3
 from urllib3.connection import HTTPConnection
 
 from telegram import (InputFile, TelegramError)
-from telegram.error import Unauthorized, NetworkError, TimedOut, BadRequest
+from telegram.error import Unauthorized, NetworkError, TimedOut, BadRequest, ChatMigrated
 
 _CON_POOL = None
 """:type: urllib3.PoolManager"""
@@ -135,8 +135,15 @@ def _parse(json_data):
     except ValueError:
         raise TelegramError('Invalid server response')
 
-    if not data.get('ok') and data.get('description'):
-        return data['description']
+    if not data.get('ok'):
+        description = data.get('description')
+        parameters = data.get('parameters')
+        if parameters:
+            migrate_to_chat_id = parameters.get('migrate_to_chat_id')
+            if migrate_to_chat_id:
+                raise ChatMigrated(migrate_to_chat_id)
+        if description:
+            return description
 
     return data['result']