JsonResponse

class JsonResponse extends Response

Response represents an HTTP response in JSON format.

Note that this class does not force the returned JSON content to be an object. It is however recommended that you do return an object as it protects yourself against XSSI and JSON-JavaScript Hijacking.

Constants

Properties

Methods

Details

return JsonResponse::create($data, 200)
    ->setSharedMaxAge(300);

Source code

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace App\Khan\Component\HttpFoundation;

/**
 * Response represents an HTTP response in JSON format.
 *
 * Note that this class does not force the returned JSON content to be an
 * object. It is however recommended that you do return an object as it
 * protects yourself against XSSI and JSON-JavaScript Hijacking.
 *
 * @see https://www.owasp.org/index.php/OWASP_AJAX_Security_Guidelines#Always_return_JSON_with_an_Object_on_the_outside
 *
 * @author Igor Wiedler <igor@wiedler.ch>
 */
class JsonResponse extends Response
{
    protected $data;
    protected $callback;

    // Encode <, >, ', &, and " characters in the JSON, making it also safe to be embedded into HTML.
    // 15 === JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT
    const DEFAULT_ENCODING_OPTIONS = 15;

    protected $encodingOptions = self::DEFAULT_ENCODING_OPTIONS;

    /**
     * @param mixed $data    The response data
     * @param int   $status  The response status code
     * @param array $headers An array of response headers
     * @param bool  $json    If the data is already a JSON string
     */
    public function __construct($data = null, int $status = 200, array $headers = array(), bool $json = false)
    {
        parent::__construct('', $status, $headers);

        if (null === $data) {
            $data = new \ArrayObject();
        }

        $json ? $this->setJson($data) : $this->setData($data);
    }

    /**
     * Factory method for chainability.
     *
     * Example:
     *
     *     return JsonResponse::create($data, 200)
     *         ->setSharedMaxAge(300);
     *
     * @param mixed $data    The json response data
     * @param int   $status  The response status code
     * @param array $headers An array of response headers
     *
     * @return static
     */
    public static function create($data = null, $status = 200, $headers = array())
    {
        return new static($data, $status, $headers);
    }

    /**
     * Make easier the creation of JsonResponse from raw json.
     */
    public static function fromJsonString($data = null, $status = 200, $headers = array())
    {
        return new static($data, $status, $headers, true);
    }

    /**
     * Sets the JSONP callback.
     *
     * @param string|null $callback The JSONP callback or null to use none
     *
     * @return $this
     *
     * @throws \InvalidArgumentException When the callback name is not valid
     */
    public function setCallback($callback = null)
    {
        if (null !== $callback) {
            // partially taken from http://www.geekality.net/2011/08/03/valid-javascript-identifier/
            // partially taken from https://github.com/willdurand/JsonpCallbackValidator
            //      JsonpCallbackValidator is released under the MIT License. See https://github.com/willdurand/JsonpCallbackValidator/blob/v1.1.0/LICENSE for details.
            //      (c) William Durand <william.durand1@gmail.com>
            $pattern = '/^[$_\p{L}][$_\p{L}\p{Mn}\p{Mc}\p{Nd}\p{Pc}\x{200C}\x{200D}]*(?:\[(?:"(?:\\\.|[^"\\\])*"|\'(?:\\\.|[^\'\\\])*\'|\d+)\])*?$/u';
            $reserved = array(
                'break', 'do', 'instanceof', 'typeof', 'case', 'else', 'new', 'var', 'catch', 'finally', 'return', 'void', 'continue', 'for', 'switch', 'while',
                'debugger', 'function', 'this', 'with', 'default', 'if', 'throw', 'delete', 'in', 'try', 'class', 'enum', 'extends', 'super',  'const', 'export',
                'import', 'implements', 'let', 'private', 'public', 'yield', 'interface', 'package', 'protected', 'static', 'null', 'true', 'false',
            );
            $parts = explode('.', $callback);
            foreach ($parts as $part) {
                if (!preg_match($pattern, $part) || in_array($part, $reserved, true)) {
                    throw new \InvalidArgumentException('The callback name is not valid.');
                }
            }
        }

        $this->callback = $callback;

        return $this->update();
    }

    /**
     * Sets a raw string containing a JSON document to be sent.
     *
     * @param string $json
     *
     * @return $this
     *
     * @throws \InvalidArgumentException
     */
    public function setJson($json)
    {
        $this->data = $json;

        return $this->update();
    }

    /**
     * Sets the data to be sent as JSON.
     *
     * @param mixed $data
     *
     * @return $this
     *
     * @throws \InvalidArgumentException
     */
    public function setData($data = array())
    {
        try {
            $data = json_encode($data, $this->encodingOptions);
        } catch (\Exception $e) {
            if ('Exception' === get_class($e) && 0 === strpos($e->getMessage(), 'Failed calling ')) {
                throw $e->getPrevious() ?: $e;
            }
            throw $e;
        }

        if (JSON_ERROR_NONE !== json_last_error()) {
            throw new \InvalidArgumentException(json_last_error_msg());
        }

        return $this->setJson($data);
    }

    /**
     * Returns options used while encoding data to JSON.
     *
     * @return int
     */
    public function getEncodingOptions()
    {
        return $this->encodingOptions;
    }

    /**
     * Sets options used while encoding data to JSON.
     *
     * @param int $encodingOptions
     *
     * @return $this
     */
    public function setEncodingOptions($encodingOptions)
    {
        $this->encodingOptions = (int) $encodingOptions;

        return $this->setData(json_decode($this->data));
    }

    /**
     * Updates the content and headers according to the JSON data and callback.
     *
     * @return $this
     */
    protected function update()
    {
        if (null !== $this->callback) {
            // Not using application/javascript for compatibility reasons with older browsers.
            $this->headers->set('Content-Type', 'text/javascript');

            return $this->setContent(sprintf('/**/%s(%s);', $this->callback, $this->data));
        }

        // Only set the header when there is none or when it equals 'text/javascript' (from a previous update with callback)
        // in order to not overwrite a custom definition.
        if (!$this->headers->has('Content-Type') || 'text/javascript' === $this->headers->get('Content-Type')) {
            $this->headers->set('Content-Type', 'application/json');
        }

        return $this->setContent($this->data);
    }
}