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If ActivityPub doesnt impose any restrictions on the data model and flow, then it should be possible to bridge an ActivityPub network.

• vidarh 3y ago
  It imposes some limits, but they're pretty basic. Mastodon then adds a few more things. E.g. @vidar@galaxybound.com is my Mastodon handle, but that resolves to an ActivityPub actor via webfinger [1]. The ActivityPub actor is at [2]. Basically ActivityPub sets out a very basic skeleton for passing messages ("activities") between actors designated by URI's. Those messages must be JSON and has a few very basic requirements, such as having a "type". E.g. "Announce" is a type that corresponds to "boost" or "retweet", "Create" is a type that means you're creating another object such as a "Note" (toot/tweet) which follows the same general structure. Those messages can be addressed to specific other URI's representing audiences with to/cc fields. When you add that to your outbox, you or your instance also need to post them to your followers instances. So as long as you can receive POST's w/JSON, and return a list of JSON versions of messages, you have the basics. The JSON in ActivityPub is verbose but it's not very hard to generate, so bridging is likely doable. [1] https://webfinger.net/lookup/?resource=vidar%40galaxybound.com https://webfinger.net/lookup/?resource=vidar%40galaxybound.c... [2] https://m.galaxybound.com/users/vidar https://m.galaxybound.com/users/vidar but needs Accept: header: curl -H "Accept: application/activity+json" https://m.galaxybound.com/users/vidar https://m.galaxybound.com/users/vidar | jq .