disabled_oauth_sign_in_sources parameter handling in ApplicationSettingsController

app/controllers/admin/application_settings_controller.rb

@@ -53,6 +53,15 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
       end
     end
+    disabled_oauth_sign_in_sources = params[:application_setting][:disabled_oauth_sign_in_sources]
+    if disabled_oauth_sign_in_sources.nil?
+      params[:application_setting][:disabled_oauth_sign_in_sources] = []
+    else
+      disabled_oauth_sign_in_sources.map! do |source|
+        source.to_str
+      end
+    end
+
     params.require(:application_setting).permit(
       :default_projects_limit,
       :default_branch_protection,
@@ -95,7 +104,8 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
       :repository_checks_enabled,
       :metrics_packet_size,
       restricted_visibility_levels: [],
-      import_sources: []
+      import_sources: [],
+      disabled_oauth_sign_in_sources: []
     )
   end
 end