Make Members with Owner and Master roles always able to create subgroups

app/controllers/groups_controller.rb

@@ -10,7 +10,7 @@ class GroupsController < Groups::ApplicationController
 
   # Authorize
   before_action :authorize_admin_group!, only: [:edit, :update, :destroy, :projects]
-  before_action :authorize_create_group!, only: [:new, :create]
+  before_action :authorize_create_group!, only: [:new]
 
   before_action :group_projects, only: [:projects, :activity, :issues, :merge_requests]
   before_action :group_merge_requests, only: [:merge_requests]
@@ -25,14 +25,7 @@ class GroupsController < Groups::ApplicationController
   end
 
   def new
-    @group = Group.new
-
-    if params[:parent_id].present?
-      parent = Group.find_by(id: params[:parent_id])
-      if can?(current_user, :create_subgroup, parent)
-        @group.parent = parent
-      end
-    end
+    @group = Group.new(params.permit(:parent_id))
   end
 
   def create
@@ -128,9 +121,14 @@ class GroupsController < Groups::ApplicationController
   end
 
   def authorize_create_group!
-    unless can?(current_user, :create_group)
-      return render_404
+    allowed = if params[:parent_id].present?
+                parent = Group.find_by(id: params[:parent_id])
+                can?(current_user, :create_subgroup, parent)
+              else
+                can?(current_user, :create_group)
               end
+
+    render_404 unless allowed
   end
 
   def determine_layout

app/policies/group_policy.rb

@@ -49,7 +49,7 @@ class GroupPolicy < BasePolicy
     enable :change_visibility_level
   end
 
-  rule { owner & can_create_group & nested_groups_supported }.enable :create_subgroup
+  rule { owner & nested_groups_supported }.enable :create_subgroup
 
   rule { public_group | logged_in_viewable }.enable :view_globally
 

app/services/groups/create_service.rb

@@ -8,15 +8,7 @@ module Groups
     def execute
       @group = Group.new(params)
 
-      unless Gitlab::VisibilityLevel.allowed_for?(current_user, params[:visibility_level])
-        deny_visibility_level(@group)
-        return @group
-      end
-
-      if @group.parent && !can?(current_user, :create_subgroup, @group.parent)
-        @group.parent = nil
-        @group.errors.add(:parent_id, 'You don’t have permission to create a subgroup in this group.')
-
+      unless can_use_visibility_level? && can_create_group?
         return @group
       end
 
@@ -39,5 +31,33 @@ module Groups
     def create_chat_team?
       Gitlab.config.mattermost.enabled && @chat_team && group.chat_team.nil?
     end
+
+    def can_create_group?
+      if @group.subgroup?
+        unless can?(current_user, :create_subgroup, @group.parent)
+          @group.parent = nil
+          @group.errors.add(:parent_id, 'You don’t have permission to create a subgroup in this group.')
+
+          return false
+        end
+      else
+        unless can?(current_user, :create_group)
+          @group.errors.add(:base, 'You don’t have permission to create groups.')
+
+          return false
+        end
+      end
+
+      true
+    end
+
+    def can_use_visibility_level?
+      unless Gitlab::VisibilityLevel.allowed_for?(current_user, params[:visibility_level])
+        deny_visibility_level(@group)
+        return false
+      end
+
+      true
+    end
   end
 end

lib/api/groups.rb

@@ -74,7 +74,12 @@ module API
         use :optional_params
       end
       post do
+        parent_group = find_group!(params[:parent_id]) if params[:parent_id].present?
+        if parent_group
+          authorize! :create_subgroup, parent_group
+        else
           authorize! :create_group
+        end
 
         group = ::Groups::CreateService.new(current_user, declared_params(include_missing: false)).execute
 

lib/api/helpers.rb

@@ -93,7 +93,7 @@ module API
     end
 
     def find_group(id)
-      if id =~ /^\d+$/
+      if id.to_s =~ /^\d+$/
         Group.find_by(id: id)
       else
         Group.find_by_full_path(id)

spec/controllers/groups_controller_spec.rb

@@ -2,9 +2,133 @@ require 'rails_helper'
 
 describe GroupsController do
   let(:user) { create(:user) }
+  let(:admin) { create(:admin) }
   let(:group) { create(:group, :public) }
   let(:project) { create(:project, namespace: group) }
   let!(:group_member) { create(:group_member, group: group, user: user) }
+  let!(:owner) { group.add_owner(create(:user)).user }
+  let!(:master) { group.add_master(create(:user)).user }
+  let!(:developer) { group.add_developer(create(:user)).user }
+  let!(:guest) { group.add_guest(create(:user)).user }
+
+  shared_examples 'member with ability to create subgroups' do
+    it 'renders the new page' do
+      sign_in(member)
+
+      get :new, parent_id: group.id
+
+      expect(response).to render_template(:new)
+    end
+  end
+
+  shared_examples 'member without ability to create subgroups' do
+    it 'renders the 404 page' do
+      sign_in(member)
+
+      get :new, parent_id: group.id
+
+      expect(response).not_to render_template(:new)
+      expect(response.status).to eq(404)
+    end
+  end
+
+  describe 'GET #new' do
+    context 'when creating subgroups', :nested_groups do
+      [true, false].each do |can_create_group_status|
+        context "and can_create_group is #{can_create_group_status}" do
+          before do
+            User.where(id: [admin, owner, master, developer, guest]).update_all(can_create_group: can_create_group_status)
+          end
+
+          [:admin, :owner].each do |member_type|
+            context "and logged in as #{member_type.capitalize}" do
+              it_behaves_like 'member with ability to create subgroups' do
+                let(:member) { send(member_type) }
+              end
+            end
+          end
+
+          [:guest, :developer, :master].each do |member_type|
+            context "and logged in as #{member_type.capitalize}" do
+              it_behaves_like 'member without ability to create subgroups' do
+                let(:member) { send(member_type) }
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+
+  describe 'POST #create' do
+    context 'when creating subgroups', :nested_groups do
+      [true, false].each do |can_create_group_status|
+        context "and can_create_group is #{can_create_group_status}" do
+          context 'and logged in as Owner' do
+            it 'creates the subgroup' do
+              owner.update_attribute(:can_create_group, can_create_group_status)
+              sign_in(owner)
+
+              post :create, group: { parent_id: group.id, path: 'subgroup' }
+
+              expect(response).to be_redirect
+              expect(response.body).to match(%r{http://test.host/#{group.path}/subgroup})
+            end
+          end
+
+          context 'and logged in as Developer' do
+            it 'renders the new template' do
+              developer.update_attribute(:can_create_group, can_create_group_status)
+              sign_in(developer)
+
+              previous_group_count = Group.count
+
+              post :create, group: { parent_id: group.id, path: 'subgroup' }
+
+              expect(response).to render_template(:new)
+              expect(Group.count).to eq(previous_group_count)
+            end
+          end
+        end
+      end
+    end
+
+    context 'when creating a top level group' do
+      before do
+        sign_in(developer)
+      end
+
+      context 'and can_create_group is enabled' do
+        before do
+          developer.update_attribute(:can_create_group, true)
+        end
+
+        it 'creates the Group' do
+          original_group_count = Group.count
+
+          post :create, group: { path: 'subgroup' }
+
+          expect(Group.count).to eq(original_group_count + 1)
+          expect(response).to be_redirect
+        end
+      end
+
+      context 'and can_create_group is disabled' do
+        before do
+          developer.update_attribute(:can_create_group, false)
+        end
+
+        it 'does not create the Group' do
+          original_group_count = Group.count
+
+          post :create, group: { path: 'subgroup' }
+
+          expect(Group.count).to eq(original_group_count)
+          expect(response).to render_template(:new)
+        end
+      end
+    end
+  end
 
   describe 'GET #index' do
     context 'as a user' do

spec/policies/group_policy_spec.rb

@@ -24,8 +24,8 @@ describe GroupPolicy do
       :admin_namespace,
       :admin_group_member,
       :change_visibility_level,
-      :create_subgroup
-    ]
+      (Gitlab::Database.postgresql? ? :create_subgroup : nil)
+    ].compact
   end
 
   before do

spec/requests/api/groups_spec.rb

@@ -431,6 +431,30 @@ describe API::Groups do
 
         expect(response).to have_http_status(403)
       end
+
+      context 'as owner', :nested_groups do
+        before do
+          group2.add_owner(user1)
+        end
+
+        it 'can create subgroups' do
+          post api("/groups", user1), parent_id: group2.id, name: 'foo', path: 'foo'
+
+          expect(response).to have_http_status(201)
+        end
+      end
+
+      context 'as master', :nested_groups do
+        before do
+          group2.add_master(user1)
+        end
+
+        it 'cannot create subgroups' do
+          post api("/groups", user1), parent_id: group2.id, name: 'foo', path: 'foo'
+
+          expect(response).to have_http_status(403)
+        end
+      end
     end
 
     context "when authenticated as user with group permissions" do

spec/services/groups/create_service_spec.rb

@@ -22,6 +22,26 @@ describe Groups::CreateService, '#execute' do
     end
   end
 
+  describe 'creating a top level group' do
+    let(:service) { described_class.new(user, group_params) }
+
+    context 'when user can create a group' do
+      before do
+        user.update_attribute(:can_create_group, true)
+      end
+
+      it { is_expected.to be_persisted }
+    end
+
+    context 'when user can not create a group' do
+      before do
+        user.update_attribute(:can_create_group, false)
+      end
+
+      it { is_expected.not_to be_persisted }
+    end
+  end
+
   describe 'creating subgroup', :nested_groups do
     let!(:group) { create(:group) }
     let!(:service) { described_class.new(user, group_params.merge(parent_id: group.id)) }
@@ -44,15 +64,28 @@ describe Groups::CreateService, '#execute' do
       end
     end
 
-    context 'as guest' do
-      it 'does not save group and returns an error' do
+    context 'when nested groups feature is enabled' do
+      before do
         allow(Group).to receive(:supports_nested_groups?).and_return(true)
+      end
 
+      context 'as guest' do
+        it 'does not save group and returns an error' do
           is_expected.not_to be_persisted
+
           expect(subject.errors[:parent_id].first).to eq('You don’t have permission to create a subgroup in this group.')
           expect(subject.parent_id).to be_nil
         end
       end
+
+      context 'as owner' do
+        before do
+          group.add_owner(user)
+        end
+
+        it { is_expected.to be_persisted }
+      end
+    end
   end
 
   describe 'creating a mattermost team' do