Adapt botogram to the recent API changes.

The GroupChat object was removed, and a generic Chat object was introduced
instead of the old one. This object is used for private conversations, group
chats and channels, so the Message.chat attribute won't contain anymore the
User or the GroupChat object, but only the Chat one.

Also the API change introduced support for managing channels. Details of the
implementation are tracked on issue #7.

botogram/frozenbot.py

@@ -121,12 +121,12 @@ def command(self, name):
     def send(self, chat, message, preview=True, reply_to=None, syntax=None,
              extra=None):
         """Send a message in a chat"""
-        obj = objects.GenericChat({"id": chat}, self.api)
+        obj = objects.Chat({"id": chat, type: ""}, self.api)
         obj.send(message, preview, reply_to, syntax, extra)
 
     def send_photo(self, chat, path, caption="", reply_to=None, extra=None):
         """Send a photo in a chat"""
-        obj = objects.GenericChat({"id": chat}, self.api)
+        obj = objects.GenericChat({"id": chat, type: ""}, self.api)
         obj.send_photo(path, caption, reply_to, extra)
 
     # Let's process the messages

botogram/objects/__init__.py

@@ -15,14 +15,6 @@ class EmptyObject(BaseObject):
     pass
 
 
-class GenericChat(BaseObject, mixins.ChatMixin):
-    """Internal representation of a generic chat"""
-
-    required = {
-        "id": int,
-    }
-
-
 class User(BaseObject, mixins.ChatMixin):
     """Telegram API representation of an user
 
@@ -39,15 +31,21 @@ class User(BaseObject, mixins.ChatMixin):
     }
 
 
-class GroupChat(BaseObject, mixins.ChatMixin):
-    """Telegram API representation of a group chat
+class Chat(BaseObject, mixins.ChatMixin):
+    """Telegram API representation of a chat
 
-    https://core.telegram.org/bots/api#groupchat
+    https://core.telegram.org/bots/api#chat
     """
 
     required = {
         "id": int,
+        "type": str,
+    }
+    optional = {
         "title": str,
+        "username": str,
+        "first_name": str,
+        "last_name": str,
     }
 
 
@@ -204,7 +202,7 @@ class Message(BaseObject, mixins.MessageMixin):
         "message_id": int,
         "from": User,
         "date": int,
-        "chat": one_of(User, GroupChat),
+        "chat": Chat,
     }
     optional = {
         "forward_from": User,

tests/conftest.py

@@ -67,6 +67,7 @@ def sample_update(request):
             "message_id": 2,
             "chat": {
                 "id": -1,
+                "type": "group",
                 "title": "test",
             },
             "from": {