Change policy regarding group visibility

2 files changed, 11 insertions, 4 deletions

diff --git a/app/controllers/projects/group_links_controller.rb b/app/controllers/projects/group_links_controller.rb
index 7c713c19762..bc942ba9288 100644
--- a/app/controllers/projects/group_links_controller.rb
+++ b/app/controllers/projects/group_links_controller.rb
@@ -13,9 +13,10 @@ class Projects::GroupLinksController < Projects::ApplicationController
     group = Group.find(params[:link_group_id]) if params[:link_group_id].present?
 
     if group
-      return render_404 unless can?(current_user, :read_group, group)
+      result = Projects::GroupLinks::CreateService.new(project, current_user, group_link_create_params).execute(group)
+      return render_404 if result[:http_status] == 404
 
-      Projects::GroupLinks::CreateService.new(project, current_user, group_link_create_params).execute(group)
+      flash[:alert] = result[:message] if result[:http_status] == 409
     else
       flash[:alert] = 'Please select a group.'
     end
diff --git a/app/services/projects/group_links/create_service.rb b/app/services/projects/group_links/create_service.rb
index 1392775f805..e3d5bea0852 100644
--- a/app/services/projects/group_links/create_service.rb
+++ b/app/services/projects/group_links/create_service.rb
@@ -4,13 +4,19 @@ module Projects
   module GroupLinks
     class CreateService < BaseService
       def execute(group)
-        return false unless group
+        return error('Not Found', 404) unless group && can?(current_user, :read_namespace, group)
 
-        project.project_group_links.create(
+        link = project.project_group_links.new(
           group: group,
           group_access: params[:link_group_access],
           expires_at: params[:expires_at]
         )
+
+        if link.save
+          success(link: link)
+        else
+          error(link.errors.full_messages.to_sentence, 409)
+        end
       end
     end
   end