[low] Diaspora interoperability
[ https://bugz.foocorp.net/T22 ] We can currently subscribe to and receive feeds from Diaspora users. We support their lookup schemes (a weird webfinger URL fetched from /.well-known/host-meta).
What we need is to be able to reply, which may require aligning something to their user GUID and looking up whatever they use to reply. There's Salmon in D* code, but I don't know any more than that.
Comments from @mmn
Salmon endpoint is properly implemented on Diaspora's side now, so we can look it up via XRD records.
Next step is to implement the encrypted salmon slaps on GNUsocial's end, https://wiki.diasporafoundation.org/Federation_protocol_overview#Constructing_the_encryption_header
This should be done during the development phase of GNU social 1.2