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Csrf
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TokenGenerator
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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\Security\Csrf\TokenGenerator; use Symfony\Component\Security\Core\Util\SecureRandomInterface; use Symfony\Component\Security\Core\Util\SecureRandom; /** * Generates CSRF tokens. * * @since 2.4 * @author Bernhard Schussek <bernhard.schussek@symfony.com> */ class UriSafeTokenGenerator implements TokenGeneratorInterface { /** * The generator for random values. * * @var SecureRandomInterface */ private $random; /** * The amount of entropy collected for each token (in bits). * * @var integer */ private $entropy; /** * Generates URI-safe CSRF tokens. * * @param SecureRandomInterface|null $random The random value generator used for * generating entropy * @param integer $entropy The amount of entropy collected for * each token (in bits) */ public function __construct(SecureRandomInterface $random = null, $entropy = 256) { $this->random = $random ?: new SecureRandom(); $this->entropy = $entropy; } /** * {@inheritdoc} */ public function generateToken() { // Generate an URI safe base64 encoded string that does not contain "+", // "/" or "=" which need to be URL encoded and make URLs unnecessarily // longer. $bytes = $this->random->nextBytes($this->entropy / 8); return rtrim(strtr(base64_encode($bytes), '+/', '-_'), '='); } }
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