Gab Social. All are welcome.

app/services/pubsubhubbub/subscribe_service.rb

@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+class Pubsubhubbub::SubscribeService < BaseService
+  URL_PATTERN = /\A#{URI.regexp(%w(http https))}\z/
+
+  attr_reader :account, :callback, :secret,
+              :lease_seconds, :domain
+
+  def call(account, callback, secret, lease_seconds, verified_domain = nil)
+    @account       = account
+    @callback      = Addressable::URI.parse(callback).normalize.to_s
+    @secret        = secret
+    @lease_seconds = lease_seconds
+    @domain        = verified_domain
+
+    process_subscribe
+  end
+
+  private
+
+  def process_subscribe
+    if account.nil?
+      ['Invalid topic URL', 422]
+    elsif !valid_callback?
+      ['Invalid callback URL', 422]
+    elsif blocked_domain?
+      ['Callback URL not allowed', 403]
+    else
+      confirm_subscription
+      ['', 202]
+    end
+  end
+
+  def confirm_subscription
+    subscription = locate_subscription
+    Pubsubhubbub::ConfirmationWorker.perform_async(subscription.id, 'subscribe', secret, lease_seconds)
+  end
+
+  def valid_callback?
+    callback.present? && callback =~ URL_PATTERN
+  end
+
+  def blocked_domain?
+    DomainBlock.blocked? Addressable::URI.parse(callback).host
+  end
+
+  def locate_subscription
+    subscription = Subscription.find_or_initialize_by(account: account, callback_url: callback)
+    subscription.domain = domain
+    subscription.save!
+    subscription
+  end
+end

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