ActivityPub Outbox

GoToSocial implements Outboxes for Actors (ie., instance accounts) following the ActivityPub specification here.

To get an OrderedCollection of Activities that an Actor has published recently, remote servers can do a GET request to a user's outbox. The address of this will be something like https://example.org/users/whatever/outbox.

The server will return an OrderedCollection of the following structure:

{
    "@context": "https://www.w3.org/ns/activitystreams",
    "id": "https://example.org/users/whatever/outbox",
    "type": "OrderedCollection",
    "first": "https://example.org/users/whatever/outbox?page=true"
}

Note that the OrderedCollection itself contains no items. Callers must dereference the first page to start getting items. For example, a GET to https://example.org/users/whatever/outbox?page=true will produce something like the following:

{
    "id": "https://example.org/users/whatever/outbox?page=true",
    "type": "OrderedCollectionPage",
    "next": "https://example.org/users/whatever/outbox?max_id=01FJC1Q0E3SSQR59TD2M1KP4V8&page=true",
    "prev": "https://example.org/users/whatever/outbox?min_id=01FJC1Q0E3SSQR59TD2M1KP4V8&page=true",
    "partOf": "https://example.org/users/whatever/outbox",
    "orderedItems": [
        {
            "id": "https://example.org/users/whatever/statuses/01FJC1MKPVX2VMWP2ST93Q90K7/activity",
            "type": "Create",
            "actor": "https://example.org/users/whatever",
            "published": "2021-10-18T20:06:18Z",
            "to": [
                "https://www.w3.org/ns/activitystreams#Public"
            ],
            "cc": [
                "https://example.org/users/whatever/followers"
            ],
            "object": "https://example.org/users/whatever/statuses/01FJC1MKPVX2VMWP2ST93Q90K7"
        }
    ]
}

The orderedItems array will contain up to 30 entries. To get more entries beyond that, the caller can use the next link provided in the response.

Note that in the returned orderedItems, all activity types will be Create. On each activity, the object field will be the AP URI of an original public status created by the Actor who owns the Outbox (ie., a Note with https://www.w3.org/ns/activitystreams#Public in the to field, which is not a reply to another status). Callers can use the returned AP URIs to dereference the content of the notes.

Contrary to the ActivityPub spec, GoToSocial will deny requests that are not HTTP signed--that is, unauthenticated requests. This is consistent with GoToSocial's authentication policies for other federation API endpoints. This is to ensure that GoToSocial can deny requests from domains or users that have been blocked either by the GoToSocial instance itself (domain block), or by the individual owner of the Outbox.