Add validation to verify email form.

Closes #3515147

src/Form/VerifyEmailForm.php

@@ -4,15 +4,29 @@
 
 namespace Drupal\verify_email\Form;
 
+use Drupal\Component\Utility\EmailValidatorInterface;
 use Drupal\Core\Form\FormBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\verify_email\VerifyEmailInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Provides a Verify Email form.
  */
 final class VerifyEmailForm extends FormBase {
 
+  /**
+   * Constructs a new VerifyEmailForm.
+   */
+  public function __construct(protected EmailValidatorInterface $emailValidator) {}
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container): self {
+    return new static($container->get('email.validator'));
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -31,7 +45,7 @@ public function buildForm(array $form, FormStateInterface $form_state, VerifyEma
       '#suffix' => '</div>',
     ];
 
-    $form['message'] = [
+    $form['email'] = [
       '#type' => 'textfield',
       '#title' => $this->t('Enter your email address'),
       '#required' => TRUE,
@@ -52,16 +66,11 @@ public function buildForm(array $form, FormStateInterface $form_state, VerifyEma
    * {@inheritdoc}
    */
   public function validateForm(array &$form, FormStateInterface $form_state): void {
-    // @todo Validate the form here.
-    // Example:
-    // @code
-    //   if (mb_strlen($form_state->getValue('message')) < 10) {
-    //     $form_state->setErrorByName(
-    //       'message',
-    //       $this->t('Message should be at least 10 characters.'),
-    //     );
-    //   }
-    // @endcode
+    // Use the email validator service to validate the email address.
+    $email = $form_state->getValue('email');
+    if (!$this->emailValidator->isValid($email)) {
+      $form_state->setErrorByName('email', $this->t('The email address %email is not valid.', ['%email' => $email]));
+    }
   }
 
   /**

[James Shields]

As far as I know, constructor comments are no longer required. I think this can be deleted.