Don't check whether User is channel, add peer property to User

mautrix_telegram/portal.py

@@ -572,7 +572,7 @@ class Portal(DBPortal, BasePortal):
     async def handle_matrix_invite(
         self, invited_by: u.User, puppet: p.Puppet | au.AbstractUser
     ) -> None:
-        if puppet.is_channel:
+        if isinstance(puppet, p.Puppet) and puppet.is_channel:
             raise ValueError("Can't invite channels to chats")
         try:
             if self.peer_type == "chat":

mautrix_telegram/user.py

@@ -31,6 +31,7 @@ from telethon.tl.types import (
     ChatForbidden,
     InputUserSelf,
     NotifyPeer,
+    PeerUser,
     TypeUpdate,
     UpdateFolderPeers,
     UpdateNewChannelMessage,
@@ -130,6 +131,10 @@ class User(DBUser, AbstractUser, BaseUser):
     def human_tg_id(self) -> str:
         return f"@{self.tg_username}" if self.tg_username else f"+{self.tg_phone}" or None
 
+    @property
+    def peer(self) -> PeerUser | None:
+        return PeerUser(user_id=self.tgid) if self.tgid else None
+
     # TODO replace with proper displayname getting everywhere
     @property
     def displayname(self) -> str: