class ValidReferenceConstraintValidatorTest

class ValidReferenceConstraintValidatorTest extends EntityKernelTestBase {
    use EntityReferenceFieldCreationTrait;
    use ContentTypeCreationTrait;
    
    /**
     * The typed data manager to use.
     *
     * @var \Drupal\Core\TypedData\TypedDataManager
     */
    protected $typedData;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'field',
        'node',
        'user',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installSchema('user', [
            'users_data',
        ]);
        $this->installSchema('node', [
            'node_access',
        ]);
        $this->installConfig('node');
        $this->typedData = $this->container
            ->get('typed_data_manager');
        $this->createContentType([
            'type' => 'article',
            'name' => 'Article',
        ]);
        $this->createContentType([
            'type' => 'page',
            'name' => 'Basic page',
        ]);
    }
    
    /**
     * Tests the ValidReferenceConstraintValidator.
     */
    public function testValidation() : void {
        // Create a test entity to be referenced.
        $entity = $this->createUser();
        // By default entity references already have the ValidReference constraint.
        $definition = BaseFieldDefinition::create('entity_reference')->setSettings([
            'target_type' => 'user',
        ]);
        $typed_data = $this->typedData
            ->create($definition, [
            'target_id' => $entity->id(),
        ]);
        $violations = $typed_data->validate();
        $this->assertEquals(0, $violations->count(), 'Validation passed for correct value.');
        // NULL is also considered a valid reference.
        $typed_data = $this->typedData
            ->create($definition, [
            'target_id' => NULL,
        ]);
        $violations = $typed_data->validate();
        $this->assertEquals(0, $violations->count(), 'Validation passed for correct value.');
        $typed_data = $this->typedData
            ->create($definition, [
            'target_id' => $entity->id(),
        ]);
        // Delete the referenced entity.
        $entity->delete();
        $violations = $typed_data->validate();
        $this->assertGreaterThan(0, $violations->count(), 'Validation failed for incorrect value.');
        // Make sure the information provided by a violation is correct.
        $violation = $violations[0];
        $this->assertEquals(sprintf('The referenced entity (user: %s) does not exist.', $entity->id()), $violation->getMessage(), 'The message for invalid value is correct.');
        $this->assertEquals($typed_data, $violation->getRoot(), 'Violation root is correct.');
    }
    
    /**
     * Tests the validation of pre-existing items in an entity reference field.
     */
    public function testPreExistingItemsValidation() : void {
        // Create two types of users, with and without access to bypass content
        // access.
        
        /** @var \Drupal\user\RoleInterface $role_with_access */
        $role_with_access = Role::create([
            'id' => 'role_with_access',
            'label' => 'With access',
        ]);
        $role_with_access->grantPermission('access content');
        $role_with_access->grantPermission('bypass node access');
        $role_with_access->save();
        
        /** @var \Drupal\user\RoleInterface $role_without_access */
        $role_without_access = Role::create([
            'id' => 'role_without_access',
            'label' => 'Without access',
        ]);
        $role_without_access->grantPermission('access content');
        $role_without_access->save();
        $user_with_access = User::create([
            'roles' => [
                'role_with_access',
            ],
        ]);
        $user_without_access = User::create([
            'roles' => [
                'role_without_access',
            ],
        ]);
        // Add an entity reference field.
        $this->createEntityReferenceField('entity_test', 'entity_test', 'field_test', 'Field test', 'node', 'default', [
            'target_bundles' => [
                'article',
                'page',
            ],
        ], FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
        // Create four test nodes.
        $published_node = Node::create([
            'title' => 'Test published node',
            'type' => 'article',
            'status' => NodeInterface::PUBLISHED,
        ]);
        $published_node->save();
        $unpublished_node = Node::create([
            'title' => 'Test unpublished node',
            'type' => 'article',
            'status' => NodeInterface::NOT_PUBLISHED,
        ]);
        $unpublished_node->save();
        $different_bundle_node = Node::create([
            'title' => 'Test page node',
            'type' => 'page',
            'status' => NodeInterface::PUBLISHED,
        ]);
        $different_bundle_node->save();
        $deleted_node = Node::create([
            'title' => 'Test deleted node',
            'type' => 'article',
            'status' => NodeInterface::PUBLISHED,
        ]);
        $deleted_node->save();
        $referencing_entity = EntityTest::create([
            'field_test' => [
                [
                    'entity' => $published_node,
                ],
                [
                    'entity' => $unpublished_node,
                ],
                [
                    'entity' => $different_bundle_node,
                ],
                [
                    'entity' => $deleted_node,
                ],
            ],
        ]);
        // Check that users with access are able pass the validation for fields
        // without pre-existing content.
        $this->container
            ->get('account_switcher')
            ->switchTo($user_with_access);
        $violations = $referencing_entity->field_test
            ->validate();
        $this->assertCount(0, $violations);
        // Check that users without access are not able pass the validation for
        // fields without pre-existing content.
        $this->container
            ->get('account_switcher')
            ->switchTo($user_without_access);
        $violations = $referencing_entity->field_test
            ->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals(sprintf('This entity (node: %s) cannot be referenced.', $unpublished_node->id()), $violations[0]->getMessage());
        // Now save the referencing entity which will create a pre-existing state
        // for it and repeat the checks. This time, the user without access should
        // be able to pass the validation as well because it's not changing the
        // pre-existing state.
        $referencing_entity->save();
        $this->container
            ->get('account_switcher')
            ->switchTo($user_with_access);
        $violations = $referencing_entity->field_test
            ->validate();
        $this->assertCount(0, $violations);
        // Check that users without access are able pass the validation for fields
        // with pre-existing content.
        $this->container
            ->get('account_switcher')
            ->switchTo($user_without_access);
        $violations = $referencing_entity->field_test
            ->validate();
        $this->assertCount(0, $violations);
        // Re-save the referencing entity and check that the referenced entity is
        // not affected.
        $referencing_entity->name->value = $this->randomString();
        $referencing_entity->save();
        $this->assertEquals($published_node->id(), $referencing_entity->field_test[0]->target_id);
        $this->assertEquals($unpublished_node->id(), $referencing_entity->field_test[1]->target_id);
        $this->assertEquals($different_bundle_node->id(), $referencing_entity->field_test[2]->target_id);
        $this->assertEquals($deleted_node->id(), $referencing_entity->field_test[3]->target_id);
        $violations = $referencing_entity->field_test
            ->validate();
        $this->assertCount(0, $violations);
        // Remove one of the referenceable bundles and check that a pre-existing node
        // of that bundle can not be referenced anymore.
        $field = FieldConfig::loadByName('entity_test', 'entity_test', 'field_test');
        $field->setSetting('handler_settings', [
            'target_bundles' => [
                'article',
            ],
        ]);
        $field->save();
        $referencing_entity = $this->reloadEntity($referencing_entity);
        $violations = $referencing_entity->field_test
            ->validate();
        $this->assertCount(1, $violations);
        $this->assertEquals(sprintf('This entity (node: %s) cannot be referenced.', $different_bundle_node->id()), $violations[0]->getMessage());
        // Delete the last node and check that the pre-existing reference is not
        // valid anymore.
        $deleted_node->delete();
        $violations = $referencing_entity->field_test
            ->validate();
        $this->assertCount(2, $violations);
        $this->assertEquals(sprintf('This entity (node: %s) cannot be referenced.', $different_bundle_node->id()), $violations[0]->getMessage());
        $this->assertEquals(sprintf('The referenced entity (node: %s) does not exist.', $deleted_node->id()), $violations[1]->getMessage());
    }

}