Refactor StatusReachFinder to be used in more places

app/services/activitypub/prepare_followers_synchronization_service.rb

@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-class ActivityPub::PrepareFollowersSynchronizationService < BaseService
-  include JsonLdHelper
-
-  def call(account, params)
-    @account = account
-
-    return if params['collectionId'] != @account.followers_url || invalid_origin?(params['url']) || @account.local_followers_hash == params['digest']
-
-    ActivityPub::FollowersSynchronizationWorker.perform_async(@account.id, params['url'])
-  end
-end

app/services/activitypub/process_collection_synchronization_service.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class ActivityPub::ProcessCollectionSynchronizationService < BaseService
+  include JsonLdHelper
+
+  def call(account, value)
+    return unless collection_synchronization_enabled?
+
+    @account = account
+    @params  = parse_value(value)
+
+    return if unknown_collection? || collection_up_to_date?
+
+    ActivityPub::FollowersSynchronizationWorker.perform_async(@account.id, @params['url'])
+  rescue Parslet::ParseFailed
+    Rails.logger.warn 'Error parsing Collection-Synchronization header'
+  end
+
+  private
+
+  def parse_value(value)
+    SignatureVerification::SignatureParamsTransformer.new.apply(SignatureVerification::SignatureParamsParser.new.parse(value))
+  end
+
+  def unknown_collection?
+    @params['collectionId'] != @account.followers_url || invalid_origin?(@params['url'])
+  end
+
+  def collection_up_to_date?
+    @account.local_followers_hash == @params['digest']
+  end
+
+  def collection_synchronization_enabled?
+    ENV['DISABLE_FOLLOWERS_SYNCHRONIZATION'] != 'true'
+  end
+end