Merge commit '3554c527954441fd924586a49c7d99a89101ac7e' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/authorize_interactions_controller.rb`:
  Small conflict due to our theming system.
- `streaming/index.js`:
  Upstream refactored part of the streaming server.
  We had some extra logic for handling local-only posts.
  Applied the refactor.

app/serializers/rest/account_serializer.rb

@@ -5,7 +5,7 @@ class REST::AccountSerializer < ActiveModel::Serializer
   include FormattingHelper
 
   attributes :id, :username, :acct, :display_name, :locked, :bot, :discoverable, :group, :created_at,
-             :note, :url, :avatar, :avatar_static, :header, :header_static,
+             :note, :url, :uri, :avatar, :avatar_static, :header, :header_static,
              :followers_count, :following_count, :statuses_count, :last_status_at
 
   has_one :moved_to_account, key: :moved, serializer: REST::AccountSerializer, if: :moved_and_not_nested?
@@ -66,6 +66,10 @@ class REST::AccountSerializer < ActiveModel::Serializer
     ActivityPub::TagManager.instance.url_for(object)
   end
 
+  def uri
+    ActivityPub::TagManager.instance.uri_for(object)
+  end
+
   def avatar
     full_asset_url(object.suspended? ? object.avatar.default_url : object.avatar_original_url)
   end

app/serializers/webfinger_serializer.rb

@@ -22,6 +22,7 @@ class WebfingerSerializer < ActiveModel::Serializer
       [
         { rel: 'http://webfinger.net/rel/profile-page', type: 'text/html', href: about_more_url(instance_actor: true) },
         { rel: 'self', type: 'application/activity+json', href: instance_actor_url },
+        { rel: 'http://ostatus.org/schema/1.0/subscribe', template: "#{authorize_interaction_url}?uri={uri}" },
       ]
     else
       [