Support a block list

[voxpelli]

As discussed in snarfed/bridgy#473 it would be useful to be able to import a Twitter block list, or any block list, to automatically block some mentions (so one doesn't have to manually block them though #28).

This endpoint should be able to consume and subscribe to such block lists (and ideally discover them from a user profile when someone eg. signs in using IndieAuth, #30)

Related wiki pages:

• https://indiewebcamp.com/private_posts#Public_Page_Upgrading
• http://microformats.org/wiki/block-list
• https://indiewebcamp.com/block

[tantek]

There may be two features here:

• block all webmentions from certain sites / profiles
• block webmentions from particular permalinks (like a persistent "delete" of a webmention), like deleting a particular comment on your post

[snarfed]

@voxpelli just fyi https://granary-demo.appspot.com/ now fetches twitter block lists and converts them to mf2! feel free to try, and use it if you want.

[voxpelli]

Great @snarfed! Hopefully I can get around to implement this in the not too far future