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<?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 Symfony\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://github.com/OWASP/CheatSheetSeries/blob/master/cheatsheets/AJAX_Security_Cheat_Sheet.md#always-return-json-with-an-object-on-the-outside
*
* @author Igor Wiedler <igor@wiedler.ch>
*/
class JsonResponse extends Response
{
protected mixed $data;
protected ?string $callback = null;
// 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
public const DEFAULT_ENCODING_OPTIONS = 15;
protected int $encodingOptions = self::DEFAULT_ENCODING_OPTIONS;
/**
* @param bool $json If the data is already a JSON string
*/
public function __construct(mixed $data = null, int $status = 200, array $headers = [], bool $json = false)
{
parent::__construct('', $status, $headers);
if ($json && !\is_string($data) && !is_numeric($data) && !$data instanceof \Stringable) {
throw new \TypeError(\sprintf('"%s": If $json is set to true, argument $data must be a string or object implementing __toString(), "%s" given.', __METHOD__, get_debug_type($data)));
}
$data ??= new \ArrayObject();
$json ? $this->setJson($data) : $this->setData($data);
}
/**
* Factory method for chainability.
*
* Example:
*
* return JsonResponse::fromJsonString('{"key": "value"}')
* ->setSharedMaxAge(300);
*
* @param string $data The JSON response string
* @param int $status The response status code (200 "OK" by default)
* @param array $headers An array of response headers
*/
public static function fromJsonString(string $data, int $status = 200, array $headers = []): static
{
return new static($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(?string $callback): static
{
if (null !== $callback) {
// partially taken from https://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 = [
'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.
*
* @return $this
*/
public function setJson(string $json): static
{
$this->data = $json;
return $this->update();
}
/**
* Sets the data to be sent as JSON.
*
* @return $this
*
* @throws \InvalidArgumentException
*/
public function setData(mixed $data = []): static
{
try {
$data = json_encode($data, $this->encodingOptions);
} catch (\Exception $e) {
if ('Exception' === $e::class && str_starts_with($e->getMessage(), 'Failed calling ')) {
throw $e->getPrevious() ?: $e;
}
throw $e;
}
if (\JSON_THROW_ON_ERROR & $this->encodingOptions) {
return $this->setJson($data);
}
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.
*/
public function getEncodingOptions(): int
{
return $this->encodingOptions;
}
/**
* Sets options used while encoding data to JSON.
*
* @return $this
*/
public function setEncodingOptions(int $encodingOptions): static
{
$this->encodingOptions = $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(): static
{
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);
}
}