Use helper to construct Finder params

The ProjectsFinder and GroupFinder both support the same set of params. And the
`/api/v4/projects` and `/api/v4/group/:id/projects` also support the same set of
params. But they do not match the Finder params. So use a helper method to
transform them.

lib/api/groups.rb

@@ -151,7 +151,7 @@ module API
       end
       get ":id/projects" do
         group = find_group!(params[:id])
-        projects = GroupProjectsFinder.new(group: group, current_user: current_user).execute
+        projects = GroupProjectsFinder.new(group: group, current_user: current_user, params: project_finder_params).execute
         projects = filter_projects(projects)
         entity = params[:simple] ? Entities::BasicProjectDetails : Entities::Project
         present paginate(projects), with: entity, current_user: current_user

lib/api/helpers.rb

@@ -264,6 +264,16 @@ module API
       projects.reorder(params[:order_by] => params[:sort])
     end
+    def project_finder_params
+      finder_params = {}
+      finder_params[:non_public] = true if params[:membership].present?
+      finder_params[:starred] = true if params[:starred].present?
+      finder_params[:visibility_level] = Gitlab::VisibilityLevel.level_value(params[:visibility]) if params[:visibility]
+      finder_params[:archived] = params[:archived]
+      finder_params[:search] = params[:search] if params[:search]
+      finder_params
+    end
+
     # file helpers
     def uploaded_file(field, uploads_path)

lib/api/projects.rb

@@ -68,14 +68,7 @@ module API
         end
         def present_projects(options = {})
-          finder_params = {}
-          finder_params[:non_public] = true if params[:membership].present?
-          finder_params[:starred] = true if params[:starred].present?
-          finder_params[:visibility_level] = Gitlab::VisibilityLevel.level_value(params[:visibility]) if params[:visibility]
-          finder_params[:archived] = params[:archived]
-          finder_params[:search] = params[:search] if params[:search]
-
-          projects = ProjectsFinder.new(current_user: current_user, params: finder_params).execute
+          projects = ProjectsFinder.new(current_user: current_user, params: project_finder_params).execute
           projects = filter_projects(projects)
           projects = projects.with_statistics if params[:statistics]
           projects = projects.with_issues_enabled if params[:with_issues_enabled]