Gab Social. All are welcome.

app/services/pubsubhubbub/unsubscribe_service.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class Pubsubhubbub::UnsubscribeService < BaseService
+  attr_reader :account, :callback
+
+  def call(account, callback)
+    @account  = account
+    @callback = Addressable::URI.parse(callback).normalize.to_s
+
+    process_unsubscribe
+  end
+
+  private
+
+  def process_unsubscribe
+    if account.nil?
+      ['Invalid topic URL', 422]
+    else
+      confirm_unsubscribe unless subscription.nil?
+      ['', 202]
+    end
+  end
+
+  def confirm_unsubscribe
+    Pubsubhubbub::ConfirmationWorker.perform_async(subscription.id, 'unsubscribe')
+  end
+
+  def subscription
+    @_subscription ||= Subscription.find_by(account: account, callback_url: callback)
+  end
+end