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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;
/**
* Generates CSRF tokens.
*
* @author Bernhard Schussek <bernhard.schussek@symfony.com>
*/
class UriSafeTokenGenerator implements TokenGeneratorInterface
{
/**
* The amount of entropy collected for each token (in bits).
*
* @var int
*/
private $entropy;
/**
* Generates URI-safe CSRF tokens.
*
* @param int $entropy The amount of entropy collected for each token (in bits)
*/
public function __construct($entropy = 256)
{
$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.
$bytes = random_bytes($this->entropy / 8);
return rtrim(strtr(base64_encode($bytes), '+/', '-_'), '=');
}
}
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