How to tell if a user was addressed in a message

[ovidiu-ionescu]

If I send a message in a room addressing a certain user, for instance:

 @my-bot do some work

how can I detect in the code this message was actually for my-bot?

I dumped the whole SyncMessageEvent and I could not find any field to indicate that.

The only place I can see the address is in the formatted body but I don't feel confortable parsing that and looking for user names. Is there a standard way to figure out this information from the message?

SyncMessageEvent {
    content: RoomMessageEventContent {
        msgtype: Text(
            TextMessageEventContent {
                body: "user1: hello",
                formatted: Some(
                    FormattedBody {
                        format: Html,
                        body: "<a href=\"https://matrix.to/#/@user1:matrix.org\">user2</a>: hello",
                    },
                ),
            },
        ),
        relates_to: Some(
            _Custom,
        ),
    },
    event_id: "$4tWH8L7mzUA8_QdlJxavJXoqXjf5UplKWaEHaIpdoyM",
    sender: "@user2:matrix.org",
    origin_server_ts: MilliSecondsSinceUnixEpoch(
        1648479360128,
    ),
    unsigned: Unsigned {
        age: None,
        transaction_id: None,
    },
}

[zecakeh]

Hi!

The part about mentions in the Matrix spec is here. So for a proper mention you actually need to check the formatted body for an <a> tag with a Matrix URI.

If you use the SDK as a git dependency you can actually try to parse the link as a MatrixUri or a MatrixToUri and that should give you the user with the id() method.

I think there is also the simpler convention of using !mybot {cmd}. This forces you to have a rather unique name for the prefix to have no conflict with other bots, but then you just have to check the start of the body.

[poljar]

I think that this has been answered.