HashValue.php

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<?php
 
declare(strict_types=1);
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
namespace ‪TYPO3\CMS\Core\Security\ContentSecurityPolicy;
 
use ‪TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
 
final class ‪HashValue implements \Stringable, ‪SourceValueInterface
{
    public readonly string ‪$value;
 
    public static function ‪create(string ‪$value, ‪HashType $type = HashType::sha256): self
    {
        return new self(‪$value, $type);
    }
 
    public function ‪__construct(string ‪$value, public readonly ‪HashType $type = HashType::sha256)
    {
        $length = strlen(‪$value);
        if ($length === $this->type->length()) {
            ‪$value = base64_encode(‪$value);
        } elseif ($length === $this->type->length() * 2 && ctype_xdigit(‪$value)) {
            ‪$value = base64_encode(hex2bin(‪$value));
        } elseif (strlen(base64_decode(‪$value) ?: '') !== $this->type->length()) {
            throw new \LogicException('Invalid base64 encoded value', 1678620881);
        }
        $this->value = ‪$value;
    }
 
    public function ‪__toString(): string
    {
        return sprintf("'%s-%s'", $this->type->value, $this->value);
    }
 
    public static function ‪knows(string ‪$value): bool
    {
        return preg_match(self::createParsingPattern(), ‪$value) === 1;
    }
 
    public static function ‪parse(string ‪$value): self
    {
        if (preg_match(self::createParsingPattern(), ‪$value, $matches) !== 1) {
            throw new \LogicException(sprintf('Parsing "%s" is not known', ‪$value), 1678621397);
        }
        return new self($matches['value'], HashType::from($matches['type']));
    }
 
    private static function ‪createParsingPattern(): string
    {
        $types = array_map(static fn(‪HashType $type): string => $type->value, HashType::cases());
        return sprintf("/^'(?P<type>%s)-(?P<value>.+)'$/", implode('|', $types));
    }
 
    public function ‪compile(?‪FrontendInterface $cache = null): ?string
    {
        return (string)$this;
    }
 
    public function ‪serialize(): ?string
    {
        return (string)$this;
    }
}