Extend api v2 users service with project scope

app/services/user_search_service.rb

@@ -31,6 +31,7 @@ class UserSearchService
   attr_accessor :params
 
   SEARCH_SCOPES = [
+    'project_id',
     'ids',
     'group_id',
     'status',
@@ -42,7 +43,8 @@ class UserSearchService
   end
 
   def search
-    scope = User
+    scope = params[:project_id] ? Project.find(params[:project_id]).users : User
+
     params[:ids].present? ? ids_search(scope) : query_search(scope)
   end
 

config/routes.rb

@@ -93,6 +93,7 @@ OpenProject::Application.routes.draw do
           get :available_projects, :on => :collection
         end
         resources :statuses, :only => [:index, :show]
+        resources :users, only: [:index]
 
         member do
           get :planning_element_custom_fields

spec/controllers/api/v2/users_controller_spec.rb

@@ -101,6 +101,21 @@ describe Api::V2::UsersController do
       end
     end
 
+    describe 'within a project' do
+      include_context "As a normal user"
+
+      let(:project) { FactoryGirl.create :project }
+      let!(:member)  { FactoryGirl.create :user, member_in_project: project }
+
+      let!(:non_member) { FactoryGirl.create :user }
+
+      before { get 'index', project_id: project.to_param, format: :json }
+
+      it_behaves_like "valid user API call" do
+        let(:user_count) { 1 }
+      end
+    end
+
     describe 'search for ids' do
       include_context "As an admin"