Support joining via https://t.me/s/roomname links

[anoadragon453]

I'm a bit of a noob with Telegram, and as such am not entirely sure what an extra /s/ in a Telegram invite link means. But somehow I ended up with this URL on my clipboard from visiting a https://t.me site in my webbrowser.

I tried to hand it to the bridge via join https://t.me/s/roomname, and got the following back as a response:

Traceback (most recent call last):
  File "/home/synapse/bridges/mautrix-telegram/env/lib/python3.8/site-packages/mautrix/bridge/commands/handler.py", line 405, in handle
    await self._run_handler(handler, evt)
  File "/home/synapse/bridges/mautrix-telegram/mautrix_telegram/commands/handler.py", line 121, in _run_handler
    return await handler(evt)
  File "/home/synapse/bridges/mautrix-telegram/env/lib/python3.8/site-packages/mautrix/bridge/commands/handler.py", line 290, in __call__
    return await self._handler(evt)
  File "/home/synapse/bridges/mautrix-telegram/mautrix_telegram/commands/telegram/misc.py", line 154, in join
    updates, _ = await _join(evt, arg.group(1))
  File "/home/synapse/bridges/mautrix-telegram/mautrix_telegram/commands/telegram/misc.py", line 136, in _join
    channel = await evt.sender.client.get_entity(arg)
  File "/home/synapse/bridges/mautrix-telegram/env/lib/python3.8/site-packages/telethon/client/users.py", line 328, in get_entity
    result.append(await self._get_entity_from_string(x))
  File "/home/synapse/bridges/mautrix-telegram/env/lib/python3.8/site-packages/telethon/client/users.py", line 567, in _get_entity_from_string
    raise ValueError(
ValueError: Cannot find any entity corresponding to "s/someroom"

However, doing join https://t.me/someroom instead worked fine.

If this is some sort of standard Telegram thing, then it might be nice to handle and strip the /s bit from them :)