Merge branch 'fe-paginated-environments-api' into fe-paginated-environments-paginationfe-paginated-environments-pagination

* fe-paginated-environments-api: (304 commits)
  added missed commit in rebase
  update Grape routes to work with current version of Grape
  adds changelog
  fixes cursor issue on pipeline pagination
  Use random group name to prevent conflicts
  List all groups/projects for admins on explore pages
  Fix indentation
  More backport
  Fix filtered search user autocomplete for gitlab instances that are hosted on a subdirectory
  Fixed variables_controller_spec.rb test
  Backport of the frontend view, including tests
  Updated the #create action to render the show view in case of a form error
  Improved code styling on the variables_controller_spec
  Added tests for the variables controller #update action
  Added a variable_controller_spec test to test for flash messages on the #create action
  Modified redirection logic in the variables cont.
  Added redirections to the index actions for the variables and triggers controllers
  Added a flash message to the creation of triggers
  Fixed tests, renamed files and methods
  Changed the controller/route name to 'ci/cd' and renamed the corresponding files
  ...

1 files changed, 20 insertions, 1 deletions

diff --git a/lib/gitlab/email/receiver.rb b/lib/gitlab/email/receiver.rb
index a40c44eb1bc..b64db5d01ae 100644
--- a/lib/gitlab/email/receiver.rb
+++ b/lib/gitlab/email/receiver.rb
@@ -35,6 +35,8 @@ module Gitlab
         handler.execute
       end
 
+      private
+
       def build_mail
         Mail::Message.new(@raw)
       rescue Encoding::UndefinedConversionError,
@@ -54,7 +56,24 @@ module Gitlab
       end
 
       def key_from_additional_headers(mail)
-        Array(mail.references).find do |mail_id|
+        references = ensure_references_array(mail.references)
+
+        find_key_from_references(references)
+      end
+
+      def ensure_references_array(references)
+        case references
+        when Array
+          references
+        when String
+          # Handle emails from clients which append with commas,
+          # example clients are Microsoft exchange and iOS app
+          Gitlab::IncomingEmail.scan_fallback_references(references)
+        end
+      end
+
+      def find_key_from_references(references)
+        references.find do |mail_id|
           key = Gitlab::IncomingEmail.key_from_fallback_message_id(mail_id)
           break key if key
         end