Add trigger information for job API

Create new entity called TriggerVariablesEnitity for trigger variables,
to aid reuseablity in the future.

Update JSON schema to include trigger information in the response.

Refactor rspec tests a bit to reduce duplication and for the `context`
to make sense.

closes https://gitlab.com/gitlab-org/gitlab-ce/issues/50989

2 files changed, 13 insertions, 0 deletions

diff --git a/app/serializers/build_details_entity.rb b/app/serializers/build_details_entity.rb
index b107fc26f18..6f8194d9856 100644
--- a/app/serializers/build_details_entity.rb
+++ b/app/serializers/build_details_entity.rb
@@ -59,6 +59,12 @@ class BuildDetailsEntity < JobEntity
     raw_project_job_path(project, build)
   end
 
+  expose :trigger, if: -> (*) { build.trigger_request } do
+    expose :trigger_short_token, as: :short_token
+
+    expose :trigger_variables, as: :variables, using: TriggerVariableEntity
+  end
+
   private
 
   def build_failed_issue_options
diff --git a/app/serializers/trigger_variable_entity.rb b/app/serializers/trigger_variable_entity.rb
new file mode 100644
index 00000000000..56203113631
--- /dev/null
+++ b/app/serializers/trigger_variable_entity.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class TriggerVariableEntity < Grape::Entity
+  include RequestAwareEntity
+
+  expose :key, :value, :public
+end