Add System Settings page.

src/main/scala/app/SystemSettingsController.scala

@@ -0,0 +1,30 @@
+package app
+
+import service.{AccountService, SystemSettingsService}
+import SystemSettingsService._
+import util.AdminOnlyAuthenticator
+import jp.sf.amateras.scalatra.forms._
+
+class SystemSettingsController extends SystemSettingsControllerBase
+  with SystemSettingsService with AccountService with AdminOnlyAuthenticator
+
+trait SystemSettingsControllerBase extends ControllerBase {
+  self: SystemSettingsService with AccountService with AdminOnlyAuthenticator =>
+
+  private case class SystemSettingsForm(allowAccountRegistration: Boolean)
+
+  private val form = mapping(
+    "allowAccountRegistration" -> trim(label("Account registration", boolean()))
+  )(SystemSettingsForm.apply)
+
+
+  get("/admin/system")(adminOnly {
+    admin.html.system(loadSystemSettings())
+  })
+
+  post("/admin/system", form)(adminOnly { form =>
+    saveSystemSettings(SystemSettings(form.allowAccountRegistration))
+    redirect("/admin/system")
+  })
+
+}