Adds bridge support to play api

* Adds a find_job helper method to find both bridges and builds
* Updates specs for jobs_finder to include bridges
* Adds a find_job spec to helper specs

changelogs/unreleased/lm-manual-bridge-support.yml

+---
+title: Add manual bridge support to api
+merge_request: 50634
+author:
+type: changed

lib/api/helpers.rb

@@ -220,6 +220,10 @@ module API
       user_project.builds.find(id.to_i)
     end
 
+    def find_job!(id)
+      user_project.processables.find(id.to_i)
+    end
+
     def authenticate!
       unauthorized! unless current_user
     end

lib/api/jobs.rb

@@ -138,25 +138,32 @@ module API
         present build, with: Entities::Ci::Job
       end
 
-      desc 'Trigger a actionable job (manual, delayed, etc)' do
-        success Entities::Ci::Job
+      desc 'Trigger an actionable job (manual, delayed, etc)' do
+        success Entities::Ci::JobBasic
         detail 'This feature was added in GitLab 8.11'
       end
       params do
         requires :job_id, type: Integer, desc: 'The ID of a Job'
       end
+
       post ":id/jobs/:job_id/play" do
         authorize_read_builds!
 
-        build = find_build!(params[:job_id])
+        job = find_job!(params[:job_id])
 
-        authorize!(:update_build, build)
-        bad_request!("Unplayable Job") unless build.playable?
+        authorize!(:play_job, job)
+
+        bad_request!("Unplayable Job") unless job.playable?
 
-        build.play(current_user)
+        job.play(current_user)
 
         status 200
-        present build, with: Entities::Ci::Job
+
+        if job.is_a?(::Ci::Build)
+          present job, with: Entities::Ci::Job
+        else
+          present job, with: Entities::Ci::Bridge
+        end
       end
     end
 

spec/requests/api/jobs_spec.rb

@@ -1007,10 +1007,26 @@ RSpec.describe API::Jobs do
       post api("/projects/#{project.id}/jobs/#{job.id}/play", api_user)
     end
 
-    context 'on an playable job' do
-      let(:job) { create(:ci_build, :manual, project: project, pipeline: pipeline) }
+    context 'on a playable job' do
+      let_it_be(:job) { create(:ci_bridge, :playable, pipeline: pipeline, downstream: project) }
+
+      before do
+        project.add_developer(user)
+      end
 
       context 'when user is authorized to trigger a manual action' do
+        context 'that is a bridge' do
+          it 'plays the job' do
+            expect(response).to have_gitlab_http_status(:ok)
+            expect(json_response['user']['id']).to eq(user.id)
+            expect(json_response['id']).to eq(job.id)
+            expect(job.reload).to be_pending
+          end
+        end
+
+        context 'that is a build' do
+          let_it_be(:job) { create(:ci_build, :manual, project: project, pipeline: pipeline) }
+
           it 'plays the job' do
             expect(response).to have_gitlab_http_status(:ok)
             expect(json_response['user']['id']).to eq(user.id)
@@ -1018,6 +1034,7 @@ RSpec.describe API::Jobs do
             expect(job.reload).to be_pending
           end
         end
+      end
 
       context 'when user is not authorized to trigger a manual action' do
         context 'when user does not have access to the project' do