Adds package build info to api

- Adds `build_info` object to package api
- Specs for the new object

changelogs/unreleased/33596-package-ci-package-pipeline-api.yml

+---
+title: Add build metadata to package API
+merge_request: 20682
+author:
+type: added

doc/api/packages.md

@@ -79,7 +79,10 @@ Example response:
       "web_path": "/namespace1/project1/-/packages/1",
       "delete_api_path": "/namespace1/project1/-/packages/1"
     },
-    "created_at": "2019-11-27T03:37:38.711Z"
+    "created_at": "2019-11-27T03:37:38.711Z",
+    "build_info": {
+      "pipeline_id": 123
+    }
   },
   {
     "id": 2,
@@ -90,7 +93,10 @@ Example response:
       "web_path": "/namespace1/project1/-/packages/1",
       "delete_api_path": "/namespace1/project1/-/packages/1"
     },
-    "created_at": "2019-11-27T03:37:38.711Z"
+    "created_at": "2019-11-27T03:37:38.711Z",
+    "build_info": {
+      "pipeline_id": 123
+    }
   }
 ]
 ```
@@ -133,7 +139,10 @@ Example response:
     "web_path": "/namespace1/project1/-/packages/1",
     "delete_api_path": "/namespace1/project1/-/packages/1"
   },
-  "created_at": "2019-11-27T03:37:38.711Z"
+  "created_at": "2019-11-27T03:37:38.711Z",
+  "build_info": {
+    "pipeline_id": 123
+  }
 }
 ```
 

ee/lib/ee/api/entities.rb

@@ -875,6 +875,10 @@ module EE
         include ::API::Helpers::RelatedResourcesHelpers
         extend EntityHelpers
 
+        class BuildInfo < Grape::Entity
+          expose :pipeline_id
+        end
+
         expose :id
         expose :name
         expose :version
@@ -893,6 +897,7 @@ module EE
         expose :created_at
         expose :project_id, if: ->(_, opts) { opts[:group] }
         expose :project_path, if: ->(obj, opts) { opts[:group] && Ability.allowed?(opts[:user], :read_project, obj.project) }
+        expose :build_info, using: BuildInfo
 
         private
 

ee/spec/factories/packages.rb

@@ -28,6 +28,12 @@ FactoryBot.define do
       after :create do |package|
         create :package_file, :npm, package: package
       end
+
+      trait :with_build do
+        after :create do |package|
+          create :package_build_info, package: package, pipeline: create(:ci_build, user: package.project.creator).pipeline
+        end
+      end
     end
 
     factory :nuget_package do
@@ -59,6 +65,9 @@ FactoryBot.define do
     end
   end
 
+  factory :package_build_info, class: Packages::BuildInfo do
+  end
+
   factory :package_file, class: Packages::PackageFile do
     package
 

ee/spec/fixtures/api/schemas/public_api/v4/packages/package_with_build.json

+{
+  "type": "object",
+  "required": ["name", "version", "package_type"],
+  "properties": {
+    "name": { "type": "string" },
+    "version": { "type": "string" },
+    "package_type": { "type": "string" },
+    "build_info": {
+      "type": "object",
+      "required": ["pipeline_id"],
+      "properties": {
+        "pipeline_id": { "type": "integer" }
+      }
+    }
+  }
+}

ee/spec/requests/api/project_packages_spec.rb

@@ -167,6 +167,19 @@ describe API::ProjectPackages do
 
           it_behaves_like 'destroy url'
         end
+
+        context 'with build info' do
+          let!(:package1) { create(:npm_package, :with_build, project: project) }
+
+          it 'returns the build info' do
+            project.add_developer(user)
+
+            get api(package_url, user)
+
+            expect(response).to have_gitlab_http_status(200)
+            expect(response).to match_response_schema('public_api/v4/packages/package_with_build', dir: 'ee')
+          end
+        end
       end
     end