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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;
use Psr\Clock\ClockInterface;
use Symfony\Component\HttpFoundation\Exception\ExpiredSignedUriException;
use Symfony\Component\HttpFoundation\Exception\LogicException;
use Symfony\Component\HttpFoundation\Exception\SignedUriException;
use Symfony\Component\HttpFoundation\Exception\UnsignedUriException;
use Symfony\Component\HttpFoundation\Exception\UnverifiedSignedUriException;
/**
* @author Fabien Potencier <fabien@symfony.com>
*/
class UriSigner
{
private const STATUS_VALID = 1;
private const STATUS_INVALID = 2;
private const STATUS_MISSING = 3;
private const STATUS_EXPIRED = 4;
/**
* @param string $hashParameter Query string parameter to use
* @param string $expirationParameter Query string parameter to use for expiration
*/
public function __construct(
#[\SensitiveParameter] private string $secret,
private string $hashParameter = '_hash',
private string $expirationParameter = '_expiration',
private ?ClockInterface $clock = null,
) {
if (!$secret) {
throw new \InvalidArgumentException('A non-empty secret is required.');
}
}
/**
* Signs a URI.
*
* The given URI is signed by adding the query string parameter
* which value depends on the URI and the secret.
*
* @param \DateTimeInterface|\DateInterval|int|null $expiration The expiration for the given URI.
* If $expiration is a \DateTimeInterface, it's expected to be the exact date + time.
* If $expiration is a \DateInterval, the interval is added to "now" to get the date + time.
* If $expiration is an int, it's expected to be a timestamp in seconds of the exact date + time.
* If $expiration is null, no expiration.
*
* The expiration is added as a query string parameter.
*/
public function sign(string $uri/* , \DateTimeInterface|\DateInterval|int|null $expiration = null */): string
{
$expiration = null;
if (1 < \func_num_args()) {
$expiration = func_get_arg(1);
}
if (null !== $expiration && !$expiration instanceof \DateTimeInterface && !$expiration instanceof \DateInterval && !\is_int($expiration)) {
throw new \TypeError(\sprintf('The second argument of "%s()" must be an instance of "%s" or "%s", an integer or null (%s given).', __METHOD__, \DateTimeInterface::class, \DateInterval::class, get_debug_type($expiration)));
}
$url = parse_url($uri);
$params = [];
if (isset($url['query'])) {
parse_str($url['query'], $params);
}
if (isset($params[$this->hashParameter])) {
throw new LogicException(\sprintf('URI query parameter conflict: parameter name "%s" is reserved.', $this->hashParameter));
}
if (isset($params[$this->expirationParameter])) {
throw new LogicException(\sprintf('URI query parameter conflict: parameter name "%s" is reserved.', $this->expirationParameter));
}
if (null !== $expiration) {
$params[$this->expirationParameter] = $this->getExpirationTime($expiration);
}
$uri = $this->buildUrl($url, $params);
$params[$this->hashParameter] = $this->computeHash($uri);
return $this->buildUrl($url, $params);
}
/**
* Checks that a URI contains the correct hash.
* Also checks if the URI has not expired (If you used expiration during signing).
*/
public function check(string $uri): bool
{
return self::STATUS_VALID === $this->doVerify($uri);
}
public function checkRequest(Request $request): bool
{
return self::STATUS_VALID === $this->doVerify(self::normalize($request));
}
/**
* Verify a Request or string URI.
*
* @throws UnsignedUriException If the URI is not signed
* @throws UnverifiedSignedUriException If the signature is invalid
* @throws ExpiredSignedUriException If the URI has expired
* @throws SignedUriException
*/
public function verify(Request|string $uri): void
{
$uri = self::normalize($uri);
$status = $this->doVerify($uri);
match ($status) {
self::STATUS_VALID => null,
self::STATUS_INVALID => throw new UnverifiedSignedUriException(),
self::STATUS_EXPIRED => throw new ExpiredSignedUriException(),
default => throw new UnsignedUriException(),
};
}
private function computeHash(string $uri): string
{
return strtr(rtrim(base64_encode(hash_hmac('sha256', $uri, $this->secret, true)), '='), ['/' => '_', '+' => '-']);
}
private function buildUrl(array $url, array $params = []): string
{
ksort($params, \SORT_STRING);
$url['query'] = http_build_query($params, '', '&');
$scheme = isset($url['scheme']) ? $url['scheme'].'://' : '';
$host = $url['host'] ?? '';
$port = isset($url['port']) ? ':'.$url['port'] : '';
$user = $url['user'] ?? '';
$pass = isset($url['pass']) ? ':'.$url['pass'] : '';
$pass = ($user || $pass) ? "$pass@" : '';
$path = $url['path'] ?? '';
$query = $url['query'] ? '?'.$url['query'] : '';
$fragment = isset($url['fragment']) ? '#'.$url['fragment'] : '';
return $scheme.$user.$pass.$host.$port.$path.$query.$fragment;
}
private function getExpirationTime(\DateTimeInterface|\DateInterval|int $expiration): string
{
if ($expiration instanceof \DateTimeInterface) {
return $expiration->format('U');
}
if ($expiration instanceof \DateInterval) {
return $this->now()->add($expiration)->format('U');
}
return (string) $expiration;
}
private function now(): \DateTimeImmutable
{
return $this->clock?->now() ?? \DateTimeImmutable::createFromFormat('U', time());
}
/**
* @return self::STATUS_*
*/
private function doVerify(string $uri): int
{
$url = parse_url($uri);
$params = [];
if (isset($url['query'])) {
parse_str($url['query'], $params);
}
if (empty($params[$this->hashParameter])) {
return self::STATUS_MISSING;
}
$hash = $params[$this->hashParameter];
unset($params[$this->hashParameter]);
if (!hash_equals($this->computeHash($this->buildUrl($url, $params)), strtr(rtrim($hash, '='), ['/' => '_', '+' => '-']))) {
return self::STATUS_INVALID;
}
if (!$expiration = $params[$this->expirationParameter] ?? false) {
return self::STATUS_VALID;
}
if ($this->now()->getTimestamp() < $expiration) {
return self::STATUS_VALID;
}
return self::STATUS_EXPIRED;
}
private static function normalize(Request|string $uri): string
{
if ($uri instanceof Request) {
$qs = ($qs = $uri->server->get('QUERY_STRING')) ? '?'.$qs : '';
$uri = $uri->getSchemeAndHttpHost().$uri->getBaseUrl().$uri->getPathInfo().$qs;
}
return $uri;
}
}