extract helper for search scope api param

lib/api/search.rb

@@ -52,6 +52,15 @@ module API
         # Defining this method here as a noop allows us to easily extend it in
         # EE, without having to modify this file directly.
       end
+
+      params :scope do |options|
+        values = SCOPE_ENTITY.stringify_keys.slice(*options[:values]).keys
+
+        requires :scope,
+          type: String,
+          desc: 'The scope of the search',
+          values: values
+      end
     end
 
     resource :search do
@@ -60,10 +69,7 @@ module API
       end
       params do
         requires :search, type: String, desc: 'The expression it should be searched for'
-        requires :scope,
-          type: String,
-          desc: 'The scope of the search',
-          values: Helpers::SearchHelpers.global_search_scopes
+        use :scope, values: Helpers::SearchHelpers.global_search_scopes
         use :pagination
       end
       get do
@@ -80,10 +86,7 @@ module API
       params do
         requires :id, type: String, desc: 'The ID of a group'
         requires :search, type: String, desc: 'The expression it should be searched for'
-        requires :scope,
-          type: String,
-          desc: 'The scope of the search',
-          values: Helpers::SearchHelpers.group_search_scopes
+        use :scope, values: Helpers::SearchHelpers.group_search_scopes
         use :pagination
       end
       get ':id/(-/)search' do
@@ -100,10 +103,7 @@ module API
       params do
         requires :id, type: String, desc: 'The ID of a project'
         requires :search, type: String, desc: 'The expression it should be searched for'
-        requires :scope,
-          type: String,
-          desc: 'The scope of the search',
-          values: Helpers::SearchHelpers.project_search_scopes
+        use :scope, Helpers::SearchHelpers.project_search_scopes
         use :pagination
       end
       get ':id/(-/)search' do