Issue #3241662 by RobLoach, squiggy, loze, gisle: Add toggle button to show...

Issue #3241662 by RobLoach, squiggy, loze, gisle: Add toggle button to show login form on error pages

src/Controller/CustomErrorController.php

@@ -85,7 +85,7 @@ class CustomErrorController extends ControllerBase {
 
     $login_form = '';
     // If the user is not logged in, show the login form.
-    if (\Drupal::currentUser()->isAnonymous()) {
+    if (\Drupal::config('customerror.settings')->get("{$code}.enable_login") && \Drupal::currentUser()->isAnonymous()) {
 
       // For reasons that are not clear to me, setting the form state redirect
       // here has no effect, logging in at this form puts us on a custom error

src/Form/CustomerrorSettingsForm.php

@@ -112,6 +112,11 @@ class CustomerrorSettingsForm extends ConfigFormBase {
         '#description'   => $this->t('Theme to be used on the error page.'),
         '#default_value' => $config->get("{$code}.theme"),
       ];
+      $form[$code]['enable_login'] = [
+        '#type'          => 'checkbox',
+        '#title'         => $this->t('Enable login form for anonymous users.'),
+        '#default_value' => $config->get("{$code}.enable_login"),
+      ];
     }
 
     $form['redirects'] = [

templates/customerror.html.twig

 {{ description }}
-LOGIN!
+
 {{ login_form }}