Mattermost gateway @-mention filter feature requests

Fixes on record

Merged to main. A stamp counts the issues a fix is linked to.

• #2443 feat(gateway): add @-mention-only filter for Mattermost channels

  merged to main

  files: gateway/platforms/mattermost.py

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  • gateway/platforms/mattermost.py

    @@ -580,6 +580,24 @@ async def _handle_ws_event(self, event: Dict[str, Any]) -> None:
             # For DMs, user_id is sufficient.  For channels, check for @mention.
             message_text = post.get("message", "")
     
    +        # Mention-only mode: skip channel messages that don't @mention the bot.
    +        # DMs (type "D") are always processed.
    +        if channel_type_raw != "D":
    +            mention_patterns = [
    +                f"@{self._bot_username}",
    +                f"@{self._bot_user_id}",
    +            ]
    +            has_mention = any(
    +                pattern.lower() in message_text.lower()
    +                for pattern in mention_patterns
    +            )
    +            if not has_mention:
    +                logger.debug(
    +                    "Mattermost: skipping non-DM message without @mention (channel=%s)",
    +                    channel_id,
    +                )
    +                return
    +
             # Resolve sender info.
             sender_id = post.get("user_id", "")
             sender_name = data.get("sender_name", "").lstrip("@") or sender_id