Add support for reversible suspensions through ActivityPub (#14989)

app/services/delete_account_service.rb

@@ -64,8 +64,15 @@ class DeleteAccountService < BaseService
   def reject_follows!
     return if @account.local? || !@account.activitypub?
 
+    # When deleting a remote account, the account obviously doesn't
+    # actually become deleted on its origin server, i.e. unlike a
+    # locally deleted account it continues to have access to its home
+    # feed and other content. To prevent it from being able to continue
+    # to access toots it would receive because it follows local accounts,
+    # we have to force it to unfollow them.
+
     ActivityPub::DeliveryWorker.push_bulk(Follow.where(account: @account)) do |follow|
-      [build_reject_json(follow), follow.target_account_id, follow.account.inbox_url]
+      [Oj.dump(serialize_payload(follow, ActivityPub::RejectFollowSerializer)), follow.target_account_id, @account.inbox_url]
     end
   end
 
@@ -114,19 +121,20 @@ class DeleteAccountService < BaseService
 
     return unless @options[:reserve_username]
 
-    @account.silenced_at      = nil
-    @account.suspended_at     = @options[:suspended_at] || Time.now.utc
-    @account.locked           = false
-    @account.memorial         = false
-    @account.discoverable     = false
-    @account.display_name     = ''
-    @account.note             = ''
-    @account.fields           = []
-    @account.statuses_count   = 0
-    @account.followers_count  = 0
-    @account.following_count  = 0
-    @account.moved_to_account = nil
-    @account.trust_level      = :untrusted
+    @account.silenced_at       = nil
+    @account.suspended_at      = @options[:suspended_at] || Time.now.utc
+    @account.suspension_origin = :local
+    @account.locked            = false
+    @account.memorial          = false
+    @account.discoverable      = false
+    @account.display_name      = ''
+    @account.note              = ''
+    @account.fields            = []
+    @account.statuses_count    = 0
+    @account.followers_count   = 0
+    @account.following_count   = 0
+    @account.moved_to_account  = nil
+    @account.trust_level       = :untrusted
     @account.avatar.destroy
     @account.header.destroy
     @account.save!
@@ -154,10 +162,6 @@ class DeleteAccountService < BaseService
     @delete_actor_json ||= Oj.dump(serialize_payload(@account, ActivityPub::DeleteActorSerializer, signer: @account))
   end
 
-  def build_reject_json(follow)
-    Oj.dump(serialize_payload(follow, ActivityPub::RejectFollowSerializer))
-  end
-
   def delivery_inboxes
     @delivery_inboxes ||= @account.followers.inboxes + Relay.enabled.pluck(:inbox_url)
   end