47 lines
1.2 KiB
PHP
47 lines
1.2 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Security\Csrf\TokenGenerator;
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/**
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* Generates CSRF tokens.
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*
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* @author Bernhard Schussek <bernhard.schussek@symfony.com>
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*/
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class UriSafeTokenGenerator implements TokenGeneratorInterface
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{
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private int $entropy;
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/**
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* Generates URI-safe CSRF tokens.
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*
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* @param int $entropy The amount of entropy collected for each token (in bits)
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*/
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public function __construct(int $entropy = 256)
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{
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if ($entropy <= 7) {
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throw new \InvalidArgumentException('Entropy should be greater than 7.');
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}
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$this->entropy = $entropy;
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}
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public function generateToken(): string
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{
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// Generate an URI safe base64 encoded string that does not contain "+",
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// "/" or "=" which need to be URL encoded and make URLs unnecessarily
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// longer.
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$bytes = random_bytes(intdiv($this->entropy, 8));
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return rtrim(strtr(base64_encode($bytes), '+/', '-_'), '=');
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}
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}
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