1 files changed, 43 insertions, 0 deletions
diff --git a/lib/gitlab/incoming_email.rb b/lib/gitlab/incoming_email.rb
new file mode 100644
index 00000000000..856ccc71084
--- /dev/null
+++ b/lib/gitlab/incoming_email.rb
@@ -0,0 +1,43 @@
+module Gitlab
+  module IncomingEmail
+    class << self
+      def enabled?
+        config.enabled && address_formatted_correctly?
+      end
+
+      def address_formatted_correctly?
+        config.address &&
+          config.address.include?("%{key}")
+      end
+
+      def reply_address(key)
+        config.address.gsub('%{key}', key)
+      end
+
+      def key_from_address(address)
+        regex = address_regex
+        return unless regex
+
+        match = address.match(regex)
+        return unless match
+
+        match[1]
+      end
+
+      private
+
+      def config
+        Gitlab.config.incoming_email
+      end
+
+      def address_regex
+        wildcard_address = config.address
+        return nil unless wildcard_address
+
+        regex = Regexp.escape(wildcard_address)
+        regex = regex.gsub(Regexp.escape('%{key}'), "(.+)")
+        Regexp.new(regex).freeze
+      end
+    end
+  end
+end