[WiP] Whenever a remote keypair changes, unfollow them and re-subscribe to … (#4907)

* Whenever a remote keypair changes, unfollow them and re-subscribe to them

In Mastodon (it could be different for other OStatus or AP-enabled software),
a keypair change is indicative of whole user (or instance) data loss. In this
situation, the “new” user might be different, and almost certainly has an empty
followers list. In this case, Mastodon instances will disagree on follower
lists, leading to unreliable delivery and “shadow followers”, that is users
believed by a remote instance to be followers, without the affected user
knowing.

Drawbacks of this change are:
1. If an user legitimately changes public key for some reason without losing
   data (not possible in Mastodon at the moment), they will have their remote
   followers unsubscribed/re-subscribed needlessly.
2. Depending of the number of remote followers, this may generate quite some
   traffic.
3. If the user change is an attempt at usurpation, the remote followers will
   unknowingly follow the usurper. Note that this is *not* a change of
   behavior, Mastodon already behaves like that, although delivery might be
   unreliable, and the usurper would not have known the former user's
   followers.

* Rename ResubscribeWorker to RefollowWorker

* Process followers in batches

app/services/activitypub/process_account_service.rb

@@ -17,7 +17,9 @@ class ActivityPub::ProcessAccountService < BaseService
 
     create_account  if @account.nil?
     upgrade_account if @account.ostatus?
+    old_public_key = @account.public_key
     update_account
+    RefollowWorker.perform_async(@account.id) if old_public_key != @account.public_key
 
     @account
   rescue Oj::ParseError

app/services/resolve_remote_account_service.rb

@@ -85,8 +85,10 @@ class ResolveRemoteAccountService < BaseService
 
   def handle_ostatus
     create_account if @account.nil?
+    old_public_key = @account.public_key
     update_account
     update_account_profile if update_profile?
+    RefollowWorker.perform_async(@account.id) if old_public_key != @account.public_key
   end
 
   def update_profile?

app/workers/refollow_worker.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class RefollowWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: 'pull', retry: false
+
+  def perform(target_account_id)
+    target_account = Account.find(target_account_id)
+
+    target_account.followers.where(domain: nil).find_each do |follower|
+      # Locally unfollow remote account
+      follower.unfollow!(target_account)
+
+      # Schedule re-follow
+      begin
+        FollowService.new.call(follower, target_account)
+      rescue Mastodon::NotPermittedError, ActiveRecord::RecordNotFound, Mastodon::UnexpectedResponseError, HTTP::Error, OpenSSL::SSL::SSLError
+        next
+      end
+    end
+  end
+end