Issue #3382108 by g089h515r806: Add support for Symfony Issn Constraint

config/schema/field_validation.schema.yml

@@ -672,3 +672,20 @@ field_validation.rule.isbn_constraint_rule:
     message:
       type: string
       label: 'Message'
+
+field_validation.rule.issn_constraint_rule:
+  type: mapping
+  label: 'Issn constraint validation rule'
+  mapping:
+    validate_mode:
+      type: string
+      label: 'Validate mode'
+    caseSensitive:
+      type: boolean
+      label: 'Case Sensitive'
+    requireHyphen:
+      type: boolean
+      label: 'Require Hyphen'
+    message:
+      type: string
+      label: 'Message'

src/Plugin/FieldValidationRule/IssnConstraintFieldValidationRule.php

+<?php
+
+namespace Drupal\field_validation\Plugin\FieldValidationRule;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\field_validation\ConstraintFieldValidationRuleBase;
+use Drupal\field_validation\FieldValidationRuleSetInterface;
+
+/**
+ * Provides funcationality for IssnConstraintFieldValidationRule.
+ *
+ * @FieldValidationRule(
+ *   id = "issn_constraint_rule",
+ *   label = @Translation("Issn constraint"),
+ *   description = @Translation("Issn constraint.")
+ * )
+ */
+class IssnConstraintFieldValidationRule extends ConstraintFieldValidationRuleBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConstraintName(): string{
+    return "Issn";
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isPropertyConstraint(): bool{
+    return TRUE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'caseSensitive' => FALSE,
+      'requireHyphen' => FALSE,
+      'message' => NULL,
+    ] + parent::defaultConfiguration();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form = parent::buildConfigurationForm($form, $form_state);
+
+    //copied from core.
+    $message = 'This value is not a valid ISSN.';
+
+    $form['caseSensitive'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Case Sensitive'),
+      '#default_value' => $this->configuration['caseSensitive'],
+    ];
+
+    $form['requireHyphen'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Require Hyphen'),
+      '#default_value' => $this->configuration['requireHyphen'],
+    ];
+
+    $form['message'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Message'),
+      '#default_value' => $this->configuration['message'] ?? $message,
+      '#maxlength' => 255,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+    parent::submitConfigurationForm($form, $form_state);
+
+    $this->configuration['caseSensitive'] = $form_state->getValue('caseSensitive');
+    $this->configuration['requireHyphen'] = $form_state->getValue('requireHyphen');
+    $this->configuration['message'] = $form_state->getValue('message');
+  }
+
+}

src/Plugin/Validation/Constraint/IssnConstraint.php

+<?php
+
+namespace Drupal\field_validation\Plugin\Validation\Constraint;
+
+use Symfony\Component\Validator\Constraints\Issn;
+use Symfony\Component\Validator\Constraints\IssnValidator;
+
+/**
+ * Issn constraint.
+ *
+ * @Constraint(
+ *   id = "Issn",
+ *   label = @Translation("Issn", context = "Validation"),
+ * )
+ */
+class IssnConstraint extends Issn {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validatedBy(): string {
+    return IssnValidator::class;
+  }
+
+}