Handles unsubscribe from notifications via email

- allows unsubscription processing of email in format "reply+%{key}+unsubscribe@acme.com" (example)
- if config.address includes %{key} and replies are enabled every unsubscriable message will include mailto: link in its List-Unsubscribe header

1 files changed, 7 insertions, 2 deletions

diff --git a/lib/gitlab/incoming_email.rb b/lib/gitlab/incoming_email.rb
index 801dfde9a36..b91012d6405 100644
--- a/lib/gitlab/incoming_email.rb
+++ b/lib/gitlab/incoming_email.rb
@@ -1,5 +1,6 @@
 module Gitlab
   module IncomingEmail
+    UNSUBSCRIBE_SUFFIX = '+unsubscribe'.freeze
     WILDCARD_PLACEHOLDER = '%{key}'.freeze
 
     class << self
@@ -18,7 +19,11 @@ module Gitlab
       end
 
       def reply_address(key)
-        config.address.gsub(WILDCARD_PLACEHOLDER, key)
+        config.address.sub(WILDCARD_PLACEHOLDER, key)
+      end
+
+      def unsubscribe_address(key)
+        config.address.sub(WILDCARD_PLACEHOLDER, "#{key}#{UNSUBSCRIBE_SUFFIX}")
       end
 
       def key_from_address(address)
@@ -49,7 +54,7 @@ module Gitlab
         return nil unless wildcard_address
 
         regex = Regexp.escape(wildcard_address)
-        regex = regex.gsub(Regexp.escape('%{key}'), "(.+)")
+        regex = regex.sub(Regexp.escape(WILDCARD_PLACEHOLDER), '(.+)')
         Regexp.new(regex).freeze
       end
     end