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update AP, matrix, ssb

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Jay Graber
2020-07-20 12:59:03 -07:00
parent b6d8d21263
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protocols/activitypub.md
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@@ -8,7 +8,9 @@ ActivityPub consists of two layers: A server-to-server federation protocol, and
Users in ActivityPub are conceptualized as actor objects. Actor to actor communication bears a resemblance to email. To be spec compliant, each actor _must_ have an "inbox" and an "outbox" endpoint, as URLs which are accessible on the server. They also _should_ have "following" and "followers". They _may_ have "liked" collections, and many other predefined possibilities.
[Authentication](https://www.w3.org/wiki/SocialCG/ActivityPub/Authentication_Authorization): Server to server federation is authenticated using HTTP Signatures. The server creates a public and private keypair for each actor, and a publicly accessible JSON-LD document retrievable over HTTP which contains its public key. Each message the server sends on behalf of an actor is signed by its key. When a remote server receives a POST to its inbox, it verifies the signature on the HTTP request. To verify object integrity, linked data signatures are used to sign the object with the publicKey of the actor who authored it.
Although not part of the ActivityPub spec, in practice Webfinger is used to discover actor profiles.
Server to server federation is [authenticated](https://www.w3.org/wiki/SocialCG/ActivityPub/Authentication_Authorization) using HTTP Signatures. The server creates a public and private keypair for each actor, and a publicly accessible JSON-LD document retrievable over HTTP which contains its public key. Each message the server sends on behalf of an actor is signed by its key. When a remote server receives a POST to its inbox, it verifies the signature on the HTTP request. To verify object integrity, linked data signatures are used to sign the object with the publicKey of the actor who authored it.
A [paper](https://github.com/WebOfTrustInfo/rwot5-boston/blob/master/final-documents/activitypub-decentralized-distributed.md) from the 2017 Rebooting the Web of Trust conference describes how distributed, cryptographic identities could be added to ActivityPub.
@@ -56,7 +58,9 @@ Any service that implements the ActivityPub server-to-server protocol can intero
The client-to-server protocol defines a standard way for user client software to connect to ActivityPub servers. In practice, it is rarely used. None of the major Fediverse services implement it. The vision of how it would work if it were widely used is that a user application could mix and match different servers like Mastodon, Pleroma, PixelFed, and any new service that implemented it.
Diaspora, another federated social network, chose not to adopt ActivityPub.
[Bridgy Fed](https://github.com/snarfed/bridgy-fed) is a project to connect IndieWeb sites with the ActivityPub and OStatus federated networks.
[Diaspora](../applications/diaspora.md), another federated social network, chose not to adopt ActivityPub.
### Scalability
@@ -66,15 +70,19 @@ The ActivityPub ecosystem scales up by adding more server capacity to the networ
[fediverse.network](https://fediverse.network/) maintains statistics of the known oStatus/ActivityPub fediverse.
### Implementations
### Implementations & Applications
[W3C Implementation Report](https://activitypub.rocks/implementation-report/)
[Watchlist for ActivityPub Apps](https://git.feneas.org/feneas/fediverse/-/wikis/watchlist-for-activitypub-apps)
Notable applications:
- [Mastodon](https://mastodon.social/about) (the largest federated network built on ActivityPub) has 2699 nodes and 2.6M users as of 5/2020
- [Pleroma](https://pleroma.social/) is another federated social network. According to stats at [the-federation.info](the-federation.info), Pleroma has 620 nodes with 35K users as of 5/2020.
- [PixelFed](https://pixelfed.org/) is an ActivityPub based image-sharing platform.
- [Friendica](https://friendi.ca/) is a decentralized social network with support for ActivityPub, as well as the OStatus and diaspora protocols.
- [PeerTube](https://joinpeertube.org/) is a free and decentralized video platform.
- [Plume](https://joinplu.me/) is a federated blogging application
### Related