Classes List

Symfony\Component\Security\Csrf\TokenGenerator\UriSafeTokenGenerator

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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
{
    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), '+/''-_'), '=');
    }
}