akkoma/FEDERATION.md

Federation

Supported federation protocols and standards

• ActivityPub (Server-to-Server)
• WebFinger
• Http Signatures
• NodeInfo

Supported FEPs

• FEP-67ff: FEDERATION
• FEP-f1d5: NodeInfo in Fediverse Software
• FEP-fffd: Proxy Objects
• FEP-c16b: Formatting MFM functions

ActivityPub

Akkoma mostly follows the server-to-server parts of the ActivityPub standard, but implements quirks for Mastodon compatibility as well as Mastodon-specific and custom extensions.

See our documentation and Mastodon’s federation information linked further below for details on these quirks and extensions.

Akkoma does not perform JSON-LD processing.

Required extensions

HTTP Signatures

All AP S2S POST requests to Akkoma instances MUST be signed. Depending on instance configuration the same may be true for GET requests.

FEP-c16b: Formatting MFM functions

The optional extension term htmlMfm is currently not used.

Nodeinfo

Akkoma provides many additional entries in its nodeinfo response, see the documentation linked below for details.

Additional documentation

• Akkoma’s ActivityPub extensions
• Akkoma’s nodeinfo extensions
• Mastodon’s federation requirements