Read pipelines from public projects though API

Allow users to read pipelines for public projects
with public builds enabled without providing an access token.

changelogs/unreleased/64269-pipeline-api-fails-with-401.yml

+---
+title: Read pipelines from public projects through API without an access token
+merge_request: 31816
+author:
+type: fixed

lib/api/pipelines.rb

@@ -4,7 +4,7 @@ module API
   class Pipelines < Grape::API
     include PaginationParams
-    before { authenticate! }
+    before { authenticate_non_get! }
     params do
       requires :id, type: String, desc: 'The project ID'
@@ -32,6 +32,7 @@ module API
       end
       get ':id/pipelines' do
         authorize! :read_pipeline, user_project
+        authorize! :read_build, user_project
         pipelines = PipelinesFinder.new(user_project, current_user, params).execute
         present paginate(pipelines), with: Entities::PipelineBasic

spec/requests/api/pipelines_spec.rb

@@ -17,6 +17,8 @@ describe API::Pipelines do
   end
   describe 'GET /projects/:id/pipelines ' do
+    it_behaves_like 'pipelines visibility table'
+
     context 'authorized user' do
       it 'returns project pipelines' do
         get api("/projects/#{project.id}/pipelines", user)
@@ -401,6 +403,15 @@ describe API::Pipelines do
   end
   describe 'GET /projects/:id/pipelines/:pipeline_id' do
+    it_behaves_like 'pipelines visibility table' do
+      let(:pipelines_api_path) do
+        "/projects/#{project.id}/pipelines/#{pipeline.id}"
+      end
+
+      let(:api_response) { response_status == 200 ? response : json_response }
+      let(:response_200) { match_response_schema('public_api/v4/pipeline/detail') }
+    end
+
     context 'authorized user' do
       it 'exposes known attributes' do
         get api("/projects/#{project.id}/pipelines/#{pipeline.id}", user)

spec/support/shared_examples/requests/api/pipelines/visibility_table_examples.rb

+# frozen_string_literal: true
+
+shared_examples 'pipelines visibility table' do
+  using RSpec::Parameterized::TableSyntax
+
+  let(:ci_user) { create(:user) }
+  let(:api_user) { user_role && ci_user }
+
+  let(:pipelines_api_path) do
+    "/projects/#{project.id}/pipelines"
+  end
+
+  let(:response_200) do
+    a_collection_containing_exactly(
+      a_hash_including('sha', 'ref', 'status', 'web_url', 'id' => pipeline.id)
+    )
+  end
+
+  let(:response_40x) do
+    a_hash_including('message')
+  end
+
+  let(:expected_response) do
+    if response_status == 200
+      response_200
+    else
+      response_40x
+    end
+  end
+
+  let(:api_response) { json_response }
+
+  let(:visibility_levels) do
+    {
+      private: Gitlab::VisibilityLevel::PRIVATE,
+      internal: Gitlab::VisibilityLevel::INTERNAL,
+      public: Gitlab::VisibilityLevel::PUBLIC
+    }
+  end
+
+  let(:builds_access_levels) do
+    {
+      enabled: ProjectFeature::ENABLED,
+      private: ProjectFeature::PRIVATE
+    }
+  end
+
+  let(:project_attributes) do
+    {
+      visibility_level: visibility_levels[visibility_level],
+      public_builds: public_builds
+    }
+  end
+
+  let(:project_feature_attributes) do
+    {
+      builds_access_level: builds_access_levels[builds_access_level]
+    }
+  end
+
+  where(:visibility_level, :builds_access_level, :public_builds, :is_admin, :user_role, :response_status) do
+    :private  | :enabled | true  | true  | :non_member | 200
+    :private  | :enabled | true  | true  | :guest      | 200
+    :private  | :enabled | true  | true  | :reporter   | 200
+    :private  | :enabled | true  | true  | :developer  | 200
+    :private  | :enabled | true  | true  | :maintainer | 200
+
+    :private  | :enabled | true  | false | nil         | 404
+    :private  | :enabled | true  | false | :non_member | 404
+    :private  | :enabled | true  | false | :guest      | 200
+    :private  | :enabled | true  | false | :reporter   | 200
+    :private  | :enabled | true  | false | :developer  | 200
+    :private  | :enabled | true  | false | :maintainer | 200
+
+    :private  | :enabled | false | true  | :non_member | 200
+    :private  | :enabled | false | true  | :guest      | 200
+    :private  | :enabled | false | true  | :reporter   | 200
+    :private  | :enabled | false | true  | :developer  | 200
+    :private  | :enabled | false | true  | :maintainer | 200
+
+    :private  | :enabled | false | false | nil         | 404
+    :private  | :enabled | false | false | :non_member | 404
+    :private  | :enabled | false | false | :guest      | 403
+    :private  | :enabled | false | false | :reporter   | 200
+    :private  | :enabled | false | false | :developer  | 200
+    :private  | :enabled | false | false | :maintainer | 200
+
+    :private  | :private | true  | true  | :non_member | 200
+    :private  | :private | true  | true  | :guest      | 200
+    :private  | :private | true  | true  | :reporter   | 200
+    :private  | :private | true  | true  | :developer  | 200
+    :private  | :private | true  | true  | :maintainer | 200
+
+    :private  | :private | true  | false | nil         | 404
+    :private  | :private | true  | false | :non_member | 404
+    :private  | :private | true  | false | :guest      | 200
+    :private  | :private | true  | false | :reporter   | 200
+    :private  | :private | true  | false | :developer  | 200
+    :private  | :private | true  | false | :maintainer | 200
+
+    :private  | :private | false | true  | :non_member | 200
+    :private  | :private | false | true  | :guest      | 200
+    :private  | :private | false | true  | :reporter   | 200
+    :private  | :private | false | true  | :developer  | 200
+    :private  | :private | false | true  | :maintainer | 200
+
+    :private  | :private | false | false | nil         | 404
+    :private  | :private | false | false | :non_member | 404
+    :private  | :private | false | false | :guest      | 403
+    :private  | :private | false | false | :reporter   | 200
+    :private  | :private | false | false | :developer  | 200
+    :private  | :private | false | false | :maintainer | 200
+
+    :internal | :enabled | true  | true  | :non_member | 200
+    :internal | :enabled | true  | true  | :guest      | 200
+    :internal | :enabled | true  | true  | :reporter   | 200
+    :internal | :enabled | true  | true  | :developer  | 200
+    :internal | :enabled | true  | true  | :maintainer | 200
+
+    :internal | :enabled | true  | false | nil         | 404
+    :internal | :enabled | true  | false | :non_member | 200
+    :internal | :enabled | true  | false | :guest      | 200
+    :internal | :enabled | true  | false | :reporter   | 200
+    :internal | :enabled | true  | false | :developer  | 200
+    :internal | :enabled | true  | false | :maintainer | 200
+
+    :internal | :enabled | false | true  | :non_member | 200
+    :internal | :enabled | false | true  | :guest      | 200
+    :internal | :enabled | false | true  | :reporter   | 200
+    :internal | :enabled | false | true  | :developer  | 200
+    :internal | :enabled | false | true  | :maintainer | 200
+
+    :internal | :enabled | false | false | nil         | 404
+    :internal | :enabled | false | false | :non_member | 403
+    :internal | :enabled | false | false | :guest      | 403
+    :internal | :enabled | false | false | :reporter   | 200
+    :internal | :enabled | false | false | :developer  | 200
+    :internal | :enabled | false | false | :maintainer | 200
+
+    :internal | :private | true  | true  | :non_member | 200
+    :internal | :private | true  | true  | :guest      | 200
+    :internal | :private | true  | true  | :reporter   | 200
+    :internal | :private | true  | true  | :developer  | 200
+    :internal | :private | true  | true  | :maintainer | 200
+
+    :internal | :private | true  | false | nil         | 404
+    :internal | :private | true  | false | :non_member | 403
+    :internal | :private | true  | false | :guest      | 200
+    :internal | :private | true  | false | :reporter   | 200
+    :internal | :private | true  | false | :developer  | 200
+    :internal | :private | true  | false | :maintainer | 200
+
+    :internal | :private | false | true  | :non_member | 200
+    :internal | :private | false | true  | :guest      | 200
+    :internal | :private | false | true  | :reporter   | 200
+    :internal | :private | false | true  | :developer  | 200
+    :internal | :private | false | true  | :maintainer | 200
+
+    :internal | :private | false | false | nil         | 404
+    :internal | :private | false | false | :non_member | 403
+    :internal | :private | false | false | :guest      | 403
+    :internal | :private | false | false | :reporter   | 200
+    :internal | :private | false | false | :developer  | 200
+    :internal | :private | false | false | :maintainer | 200
+
+    :public   | :enabled | true  | true  | :non_member | 200
+    :public   | :enabled | true  | true  | :guest      | 200
+    :public   | :enabled | true  | true  | :reporter   | 200
+    :public   | :enabled | true  | true  | :developer  | 200
+    :public   | :enabled | true  | true  | :maintainer | 200
+
+    :public   | :enabled | true  | false | nil         | 200
+    :public   | :enabled | true  | false | :non_member | 200
+    :public   | :enabled | true  | false | :guest      | 200
+    :public   | :enabled | true  | false | :reporter   | 200
+    :public   | :enabled | true  | false | :developer  | 200
+    :public   | :enabled | true  | false | :maintainer | 200
+
+    :public   | :enabled | false | true  | :non_member | 200
+    :public   | :enabled | false | true  | :guest      | 200
+    :public   | :enabled | false | true  | :reporter   | 200
+    :public   | :enabled | false | true  | :developer  | 200
+    :public   | :enabled | false | true  | :maintainer | 200
+
+    :public   | :enabled | false | false | nil         | 403
+    :public   | :enabled | false | false | :non_member | 403
+    :public   | :enabled | false | false | :guest      | 403
+    :public   | :enabled | false | false | :reporter   | 200
+    :public   | :enabled | false | false | :developer  | 200
+    :public   | :enabled | false | false | :maintainer | 200
+
+    :public   | :private | true  | true  | :non_member | 200
+    :public   | :private | true  | true  | :guest      | 200
+    :public   | :private | true  | true  | :reporter   | 200
+    :public   | :private | true  | true  | :developer  | 200
+    :public   | :private | true  | true  | :maintainer | 200
+
+    :public   | :private | true  | false | nil         | 403
+    :public   | :private | true  | false | :non_member | 403
+    :public   | :private | true  | false | :guest      | 200
+    :public   | :private | true  | false | :reporter   | 200
+    :public   | :private | true  | false | :developer  | 200
+    :public   | :private | true  | false | :maintainer | 200
+
+    :public   | :private | false | true  | :non_member | 200
+    :public   | :private | false | true  | :guest      | 200
+    :public   | :private | false | true  | :reporter   | 200
+    :public   | :private | false | true  | :developer  | 200
+    :public   | :private | false | true  | :maintainer | 200
+
+    :public   | :private | false | false | nil         | 403
+    :public   | :private | false | false | :non_member | 403
+    :public   | :private | false | false | :guest      | 403
+    :public   | :private | false | false | :reporter   | 200
+    :public   | :private | false | false | :developer  | 200
+    :public   | :private | false | false | :maintainer | 200
+  end
+
+  with_them do
+    before do
+      ci_user.update!(admin: is_admin) if user_role
+
+      project.update!(project_attributes)
+      project.project_feature.update!(project_feature_attributes)
+      project.add_role(ci_user, user_role) if user_role && user_role != :non_member
+
+      get api(pipelines_api_path, api_user)
+    end
+
+    it do
+      expect(response).to have_gitlab_http_status(response_status)
+      expect(api_response).to match(expected_response)
+    end
+  end
+end