Expect relays to answer with accept/reject (#8179)

app/lib/activitypub/activity/accept.rb

@@ -11,6 +11,8 @@ class ActivityPub::Activity::Accept < ActivityPub::Activity
   private
 
   def accept_follow
+    return accept_follow_for_relay if relay_follow?
+
     target_account = account_from_uri(target_uri)
 
     return if target_account.nil? || !target_account.local?
@@ -19,6 +21,18 @@ class ActivityPub::Activity::Accept < ActivityPub::Activity
     follow_request&.authorize!
   end
 
+  def accept_follow_for_relay
+    relay.update!(state: :accepted)
+  end
+
+  def relay
+    @relay ||= Relay.find_by(follow_activity_id: object_uri)
+  end
+
+  def relay_follow?
+    relay.present?
+  end
+
   def target_uri
     @target_uri ||= value_or_id(@object['actor'])
   end

app/lib/activitypub/activity/reject.rb

@@ -11,6 +11,8 @@ class ActivityPub::Activity::Reject < ActivityPub::Activity
   private
 
   def reject_follow
+    return reject_follow_for_relay if relay_follow?
+
     target_account = account_from_uri(target_uri)
 
     return if target_account.nil? || !target_account.local?
@@ -21,6 +23,18 @@ class ActivityPub::Activity::Reject < ActivityPub::Activity
     UnfollowService.new.call(target_account, @account) if target_account.following?(@account)
   end
 
+  def reject_follow_for_relay
+    relay.update!(state: :rejected)
+  end
+
+  def relay
+    @relay ||= Relay.find_by(follow_activity_id: object_uri)
+  end
+
+  def relay_follow?
+    relay.present?
+  end
+
   def target_uri
     @target_uri ||= value_or_id(@object['actor'])
   end

app/models/relay.rb

@@ -5,10 +5,10 @@
 #
 #  id                 :bigint(8)        not null, primary key
 #  inbox_url          :string           default(""), not null
-#  enabled            :boolean          default(FALSE), not null
 #  follow_activity_id :string
 #  created_at         :datetime         not null
 #  updated_at         :datetime         not null
+#  state              :integer          default("idle"), not null
 #
 
 class Relay < ApplicationRecord
@@ -16,24 +16,28 @@ class Relay < ApplicationRecord
 
   validates :inbox_url, presence: true, uniqueness: true, url: true, if: :will_save_change_to_inbox_url?
 
-  scope :enabled, -> { where(enabled: true) }
+  enum state: [:idle, :pending, :accepted, :rejected]
+
+  scope :enabled, -> { accepted }
 
   before_destroy :ensure_disabled
 
+  alias enabled? accepted?
+
   def enable!
     activity_id = ActivityPub::TagManager.instance.generate_uri_for(nil)
     payload     = Oj.dump(follow_activity(activity_id))
 
+    update!(state: :pending, follow_activity_id: activity_id)
     ActivityPub::DeliveryWorker.perform_async(payload, some_local_account.id, inbox_url)
-    update(enabled: true, follow_activity_id: activity_id)
   end
 
   def disable!
     activity_id = ActivityPub::TagManager.instance.generate_uri_for(nil)
     payload     = Oj.dump(unfollow_activity(activity_id))
 
+    update!(state: :idle, follow_activity_id: nil)
     ActivityPub::DeliveryWorker.perform_async(payload, some_local_account.id, inbox_url)
-    update(enabled: false, follow_activity_id: nil)
   end
 
   private