Merge pull request #245 from Pycord-Development/revert-243-revert-183-patch-4

Revert "Revert "Add `can_send` method to Messageable""

Author: BobDotCom

discord/abc.py

@@ -1529,6 +1529,59 @@ async def pins(self) -> List[Message]:
         state = self._state
         data = await state.http.pins_from(channel.id)
         return [state.create_message(channel=channel, data=m) for m in data]
+    
+    def can_send(self, *objects) -> bool:
+        """Returns a :class:`bool` indicating whether you have the permissions to send the object(s).
+
+        Raises
+        ------
+        TypeError
+            An invalid type has been passed.
+
+        Returns
+        --------
+        :class:`bool`
+            Indicates whether you have the permissions to send the object(s).
+        """
+        mapping = {
+            'Message': 'send_messages',
+            'Embed': 'embed_links',
+            'File': 'attach_files',
+            'Emoji': 'use_external_emojis',
+            'GuildSticker': 'use_external_stickers',
+        }
+        # Can't use channel = await self._get_channel() since its async
+        if hasattr(self, 'permissions_for'):
+            channel = self
+        elif hasattr(self, 'channel') and not type(self.channel).__name__ in ('DMChannel', 'GroupChannel'):
+            channel = self.channel
+        else:
+            return True # Permissions don't exist for User DMs
+
+        
+        objects = (None, ) + objects # Makes sure we check for send_messages first
+
+        for obj in objects:
+            try:
+                if obj is None:
+                    permission = mapping['Message']
+                else:
+                    permission = mapping.get(type(obj).__name__) or mapping[obj.__name__]
+                
+                if type(obj).__name__ == 'Emoji':
+                    if obj._to_partial().is_unicode_emoji or obj.guild_id == channel.guild.id:
+                        continue
+                elif type(obj).__name__ == 'GuildSticker':
+                    if obj.guild_id == channel.guild.id:
+                        continue
+
+            except (KeyError, AttributeError):
+                raise TypeError(f'The object {obj} is of an invalid type.')
+
+            if not getattr(channel.permissions_for(channel.guild.me), permission):
+                return False
+
+        return True 
 
     def history(
         self,