Merge branch 'api-fix-group-projects-filter' into 'master'

API: Add the project filter to the groups endpoint.

Related to #22928. Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/25420

See merge request !8034

lib/api/groups.rb

 module API
   class Groups < Grape::API
     include PaginationParams
-    
+
     before { authenticate! }
 
     helpers do
@@ -117,11 +117,20 @@ module API
         success Entities::Project
       end
       params do
+        optional :archived, type: Boolean, default: false, desc: 'Limit by archived status'
+        optional :visibility, type: String, values: %w[public internal private],
+                              desc: 'Limit by visibility'
+        optional :search, type: String, desc: 'Return list of authorized projects matching the search criteria'
+        optional :order_by, type: String, values: %w[id name path created_at updated_at last_activity_at],
+                            default: 'created_at', desc: 'Return projects ordered by field'
+        optional :sort, type: String, values: %w[asc desc], default: 'desc',
+                        desc: 'Return projects sorted in ascending and descending order'
         use :pagination
       end
       get ":id/projects" do
         group = find_group!(params[:id])
         projects = GroupProjectsFinder.new(group).execute(current_user)
+        projects = filter_projects(projects)
         present paginate(projects), with: Entities::Project, user: current_user
       end
 

spec/requests/api/groups_spec.rb

@@ -245,6 +245,17 @@ describe API::Groups, api: true  do
         expect(project_names).to match_array([project1.name, project3.name])
       end
 
+      it 'filters the groups projects' do
+        public_projet = create(:project, :public, path: 'test1', group: group1)
+
+        get api("/groups/#{group1.id}/projects", user1), visibility: 'public'
+
+        expect(response).to have_http_status(200)
+        expect(json_response).to be_an(Array)
+        expect(json_response.length).to eq(1)
+        expect(json_response.first['name']).to eq(public_projet.name)
+      end
+
       it "does not return a non existing group" do
         get api("/groups/1328/projects", user1)
         expect(response).to have_http_status(404)