JsonEncoder.php

<?php

namespace Drupal\serialization\Encoder;

use Symfony\Component\Serializer\Encoder\JsonDecode;
use Symfony\Component\Serializer\Encoder\JsonEncode;
use Symfony\Component\Serializer\Encoder\JsonEncoder as BaseJsonEncoder;

/**
 * Adds 'ajax' to the supported content types of the JSON encoder.
 *
 * @internal
 *   This encoder should not be used directly. Rather, use the `serializer`
 *   service.
 */
class JsonEncoder extends BaseJsonEncoder {
  
  /**
   * The formats that this Encoder supports.
   *
   * @var array
   */
  protected static $format = [
    'json',
    'ajax',
  ];
  
  /**
   * {@inheritdoc}
   */
  public function __construct(?JsonEncode $encodingImpl = NULL, ?JsonDecode $decodingImpl = NULL) {
    // Encode <, >, ', &, and " for RFC4627-compliant JSON, which may also be
    // embedded into HTML.
    // @see \Symfony\Component\HttpFoundation\JsonResponse
    $json_encoding_options = JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT;
    $this->encodingImpl = $encodingImpl ?: new JsonEncode([
      JsonEncode::OPTIONS => $json_encoding_options,
    ]);
    $this->decodingImpl = $decodingImpl ?: new JsonDecode([
      JsonDecode::ASSOCIATIVE => TRUE,
    ]);
  }
  
  /**
   * {@inheritdoc}
   */
  public function supportsEncoding(string $format, array $context = []) : bool {
    return in_array($format, static::$format);
  }
  
  /**
   * {@inheritdoc}
   */
  public function supportsDecoding(string $format, array $context = []) : bool {
    return in_array($format, static::$format);
  }

}