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MSC2765: Widget avatars

Currently widgets have a name and title associated with them, though no opportunity for avatars for a favicon-like experience. This proposal introduces such a concept.

Proposal

A new optional parameter named avatar_url is added to the widget definition. This parameter is an MXC URI to an image clients can use to associate with the widget, likely alongside the name and/or title.

Widget avatars SHOULD be legible at small sizes, such as 20x20. The MXC URI in the avatar_url should be the source material to allow clients to use the /thumbnail API to get a size for their use case.

Rendering avatars is optional for clients, much like how clients are not required to use the name or title of a widget.

An example widget would be:

{
    "creatorUserId": "@alice:example.org",
    "data": {
        "custom_key": "This is a custom key",
        "title": "This is a witty description for the widget"
    },
    "id": "20200827_WidgetExample",
    "name": "My Cool Widget",
    "type": "m.custom",
    "url": "https://example.org/my/widget.html?roomId=$matrix_room_id",
    "waitForIframeLoad": true,
    "avatar_url": "mxc://example.org/abc123"
}

Alternatives

We could define a whole structured system for different thumbnail sizes, though we have a thumbnail API which can be used to request whatever size is needed by the client.

Security considerations

Widget avatars could be non-images. Clients should use the thumbnail API to encourage error responses from the server when a widget avatar is a non-image.

Unstable prefix

While this MSC is not in a released version of the specification, clients should use an alternative event type for widgets or use org.matrix.msc2765.avatar_url when using m.widget or m.widgets as an event type.