user is now notified when creating an issue through the api

CHANGELOG

@@ -70,6 +70,7 @@ v 8.11.0
   - Remove the http_parser.rb dependency by removing the tinder gem. !5758 (tbalthazar)
   - Add Koding (online IDE) integration
   - Ability to specify branches for Pivotal Tracker integration (Egor Lynko)
+  - Creating an issue through our API now emails label subscribers !5720
   - Fix don't pass a local variable called `i` to a partial. !20510 (herminiotorres)
   - Fix rename `add_users_into_project` and `projects_ids`. !20512 (herminiotorres)
   - Fix adding line comments on the initial commit to a repo !5900

lib/api/issues.rb

@@ -154,6 +154,20 @@ module API
           render_api_error!({ labels: errors }, 400)
         end
+        if params[:labels].present?
+          params[:labels] = params[:labels].split(",").each { |word| word.strip! }
+          attrs[:label_ids] = []
+
+          params[:labels].each do |label|
+            existing_label = user_project.labels.where(title: label).first
+
+            unless existing_label.nil?
+              attrs[:label_ids] << existing_label.id
+              params[:labels].delete(label)
+            end
+          end
+        end
+
         project = user_project
         issue = ::Issues::CreateService.new(project, current_user, attrs.merge(request: request, api: true)).execute
@@ -163,10 +177,10 @@ module API
         end
         if issue.valid?
-          # Find or create labels and attach to issue. Labels are valid because
+          # create new labels and attach to issue. Labels are valid because
           # we already checked its name, so there can't be an error here
           if params[:labels].present?
-            issue.add_labels_by_names(params[:labels].split(','))
+            issue.add_labels_by_names(params[:labels])
           end
           present issue, with: Entities::Issue, current_user: current_user