1 files changed, 18 insertions, 0 deletions
diff --git a/app/services/projects/base_service.rb b/app/services/projects/base_service.rb
new file mode 100644
index 00000000000..2a683e0d40a
--- /dev/null
+++ b/app/services/projects/base_service.rb
@@ -0,0 +1,18 @@
+module Projects
+  class BaseService < ::BaseService
+    # Add an error to the project for restricted visibility levels
+    def deny_visibility_level(project, denied_visibility_level = nil)
+      denied_visibility_level ||= project.visibility_level
+
+      level_name = 'Unknown'
+      Gitlab::VisibilityLevel.options.each do |name, level|
+        level_name = name if level == denied_visibility_level
+      end
+
+      project.errors.add(
+        :visibility_level,
+        "#{level_name} visibility has been restricted by your GitLab administrator"
+      )
+    end
+  end
+end