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ActivityPub federation in Hometown

Hometown federates just like Mastodon, so the document below (identical to Mastodon's) still applies. The main difference is that any given Note object will have a localOnly property that is a boolean. While other servers will never see this boolean set to anything but false (since by definition these messages are not federated), clients will see this property and can now render a post differently based on whether it is local-only.

ActivityPub federation in Mastodon

Mastodon largely follows the ActivityPub server-to-server specification but it makes uses of some non-standard extensions, some of which are required for interacting with Mastodon at all.

Supported vocabulary: https://docs.joinmastodon.org/spec/activitypub/

Required extensions

Webfinger

In Mastodon, users are identified by a username and domain pair (e.g., Gargron@mastodon.social). This is used both for discovery and for unambiguously mentioning users across the fediverse. Furthermore, this is part of Mastodon's database design from its very beginnings.

As a result, Mastodon requires that each ActivityPub actor uniquely maps back to an acct: URI that can be resolved via WebFinger.

More information and examples are available at: https://docs.joinmastodon.org/spec/webfinger/

HTTP Signatures

In order to authenticate activities, Mastodon relies on HTTP Signatures, signing every POST and GET request to other ActivityPub implementations on behalf of the user authoring an activity (for POST requests) or an actor representing the Mastodon server itself (for most GET requests).

Mastodon requires all POST requests to be signed, and MAY require GET requests to be signed, depending on the configuration of the Mastodon server.

More information on HTTP Signatures, as well as examples, can be found here: https://docs.joinmastodon.org/spec/security/#http

Optional extensions