1 files changed, 32 insertions, 0 deletions
diff --git a/lib/gitlab/email/handler/unsubscribe_handler.rb b/lib/gitlab/email/handler/unsubscribe_handler.rb
new file mode 100644
index 00000000000..97d7a8d65ff
--- /dev/null
+++ b/lib/gitlab/email/handler/unsubscribe_handler.rb
@@ -0,0 +1,32 @@
+require 'gitlab/email/handler/base_handler'
+
+module Gitlab
+  module Email
+    module Handler
+      class UnsubscribeHandler < BaseHandler
+        def can_handle?
+          mail_key =~ /\A\w+#{Regexp.escape(Gitlab::IncomingEmail::UNSUBSCRIBE_SUFFIX)}\z/
+        end
+
+        def execute
+          raise SentNotificationNotFoundError unless sent_notification
+          return unless sent_notification.unsubscribable?
+
+          noteable = sent_notification.noteable
+          raise NoteableNotFoundError unless noteable
+          noteable.unsubscribe(sent_notification.recipient)
+        end
+
+        private
+
+        def sent_notification
+          @sent_notification ||= SentNotification.for(reply_key)
+        end
+
+        def reply_key
+          mail_key.sub(Gitlab::IncomingEmail::UNSUBSCRIBE_SUFFIX, '')
+        end
+      end
+    end
+  end
+end