UnprocessableHttpEntityExceptionNormalizer.php

<?php

namespace Drupal\jsonapi\Normalizer;

use Drupal\Component\Render\PlainTextOutput;
use Drupal\jsonapi\Exception\UnprocessableHttpEntityException;
use Symfony\Component\HttpKernel\Exception\HttpException;

/**
 * Normalizes and UnprocessableHttpEntityException.
 *
 * Normalizes an UnprocessableHttpEntityException in compliance with the JSON
 * API specification. A source pointer is added to help client applications
 * report validation errors, for example on an Entity edit form.
 *
 * @internal JSON:API maintains no PHP API since its API is the HTTP API. This
 *   class may change at any time and this will break any dependencies on it.
 *
 * @see https://www.drupal.org/project/drupal/issues/3032787
 * @see jsonapi.api.php
 *
 * @see http://jsonapi.org/format/#error-objects
 */
class UnprocessableHttpEntityExceptionNormalizer extends HttpExceptionNormalizer {
    
    /**
     * The interface or class that this Normalizer supports.
     *
     * @var string
     */
    protected $supportedInterfaceOrClass = UnprocessableHttpEntityException::class;
    
    /**
     * {@inheritdoc}
     */
    protected function buildErrorObjects(HttpException $exception) {
        
        /** @var \Drupal\jsonapi\Exception\UnprocessableHttpEntityException $exception */
        $errors = parent::buildErrorObjects($exception);
        $error = $errors[0];
        unset($error['links']);
        $errors = [];
        $violations = $exception->getViolations();
        $entity_violations = $violations->getEntityViolations();
        foreach ($entity_violations as $violation) {
            
            /** @var \Symfony\Component\Validator\ConstraintViolation $violation */
            $error['detail'] = 'Entity is not valid: ' . $violation->getMessage();
            $error['source']['pointer'] = '/data';
            $errors[] = $error;
        }
        $entity = $violations->getEntity();
        foreach ($violations->getFieldNames() as $field_name) {
            $field_violations = $violations->getByField($field_name);
            $cardinality = $entity->get($field_name)
                ->getFieldDefinition()
                ->getFieldStorageDefinition()
                ->getCardinality();
            foreach ($field_violations as $violation) {
                
                /** @var \Symfony\Component\Validator\ConstraintViolation $violation */
                $error['detail'] = $violation->getPropertyPath() . ': ' . PlainTextOutput::renderFromHtml($violation->getMessage());
                $pointer = '/data/attributes/' . str_replace('.', '/', $violation->getPropertyPath());
                if ($cardinality == 1) {
                    // Remove erroneous '/0/' index for single-value fields.
                    $pointer = str_replace("/data/attributes/{$field_name}/0/", "/data/attributes/{$field_name}/", $pointer);
                }
                $error['source']['pointer'] = $pointer;
                $errors[] = $error;
            }
        }
        return $errors;
    }

}