--- /dev/null
+<?php
+
+namespace Drupal\link\Plugin\Validation\Constraint;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Defines an access validation constraint for links.
+ *
+ * @Constraint(
+ * id = "LinkAccess",
+ * label = @Translation("Link URI can be accessed by the user.", context = "Validation"),
+ * )
+ */
+class LinkAccessConstraint extends Constraint {
+
+ public $message = "The path '@uri' is inaccessible.";
+
+}