1 files changed, 36 insertions, 0 deletions
diff --git a/lib/gitlab/email/incoming_email.rb b/lib/gitlab/email/incoming_email.rb
new file mode 100644
index 00000000000..a0a01ae0d70
--- /dev/null
+++ b/lib/gitlab/email/incoming_email.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Email
+    module IncomingEmail
+      class << self
+        include Gitlab::Email::Common
+
+        def config
+          incoming_email_config
+        end
+
+        def key_from_address(address, wildcard_address: nil)
+          wildcard_address ||= config.address
+          regex = address_regex(wildcard_address)
+          return unless regex
+
+          match = address.match(regex)
+          return unless match
+
+          match[1]
+        end
+
+        private
+
+        def address_regex(wildcard_address)
+          return unless wildcard_address
+
+          regex = Regexp.escape(wildcard_address)
+          regex = regex.sub(Regexp.escape(WILDCARD_PLACEHOLDER), '(.+)')
+          Regexp.new(/\A<?#{regex}>?\z/).freeze
+        end
+      end
+    end
+  end
+end