Add option to bridge notices and command to get relaybot info

mautrix_telegram/commands/auth.py

@@ -32,6 +32,21 @@ async def ping(evt):
         return await evt.reply("You're not logged in.")
 
 
+@command_handler()
+async def ping_bot(evt):
+    if not evt.tgbot:
+        return await evt.reply("Telegram message relay bot not configured.")
+    bot_info = await evt.tgbot.client.get_me()
+    localpart = evt.config.get("bridge.username_template", "telegram_{userid}").format(
+        userid=bot_info.id)
+    hs = evt.config["homeserver"]["domain"]
+    mxid = f"@{localpart}:{hs}"
+    displayname = bot_info.first_name
+    return await evt.reply(f"Telegram message relay bot is active: "
+                           + f"[{displayname}](https://matrix.to/#/{mxid}) (ID {bot_info.id})\n\n"
+                           + f"To use the bot, simply invite it to a portal room.")
+
+
 @command_handler(needs_auth=False, management_only=True)
 def register(evt):
     return evt.reply("Not yet implemented.")

mautrix_telegram/commands/handler.py

@@ -45,6 +45,8 @@ class CommandEvent:
         self.az = handler.az
         self.log = handler.log
         self.loop = handler.loop
+        self.tgbot = handler.tgbot
+        self.config = handler.config
         self.command_prefix = handler.command_prefix
         self.room_id = room
         self.sender = sender
@@ -87,7 +89,7 @@ class CommandHandler:
     log = logging.getLogger("mau.commands")
 
     def __init__(self, context):
-        self.az, self.db, self.config, self.loop, _ = context
+        self.az, self.db, self.config, self.loop, self.tgbot = context
         self.command_prefix = self.config["bridge.command_prefix"]
 
     # region Utility functions for handling commands

mautrix_telegram/commands/meta.py

@@ -65,6 +65,7 @@ def help(evt):
                                        `channel` (defaults to `group`).
 
 #### Portal management  
+**ping-bot**                - Get info of the message relay Telegram bot.
 **upgrade**                 - Upgrade a normal Telegram group to a supergroup.  
 **invite-link**             - Get a Telegram invite link to the current chat.  
 **delete-portal**           - Forget the current portal room. Only works for group chats; to delete