87 lines
1.9 KiB
PHP
87 lines
1.9 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Support\Baselines;
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use JsonException;
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final class BaselineEvidenceResumeToken
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{
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private const int VERSION = 1;
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/**
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* @param array<string, mixed> $state
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*/
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public static function encode(array $state): string
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{
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$payload = [
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'v' => self::VERSION,
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'state' => $state,
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];
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$json = json_encode($payload, JSON_THROW_ON_ERROR);
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return self::base64UrlEncode($json);
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}
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/**
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* @return array<string, mixed>|null
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*/
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public static function decode(string $token): ?array
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{
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$token = trim($token);
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if ($token === '') {
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return null;
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}
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$json = self::base64UrlDecode($token);
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if ($json === null) {
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return null;
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}
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try {
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$decoded = json_decode($json, true, flags: JSON_THROW_ON_ERROR);
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} catch (JsonException) {
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return null;
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}
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if (! is_array($decoded)) {
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return null;
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}
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$version = $decoded['v'] ?? null;
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$version = is_int($version) ? $version : (is_numeric($version) ? (int) $version : null);
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if ($version !== self::VERSION) {
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return null;
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}
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$state = $decoded['state'] ?? null;
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return is_array($state) ? $state : null;
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}
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private static function base64UrlEncode(string $value): string
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{
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return rtrim(strtr(base64_encode($value), '+/', '-_'), '=');
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}
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private static function base64UrlDecode(string $value): ?string
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{
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$padded = strtr($value, '-_', '+/');
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$padding = strlen($padded) % 4;
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if ($padding !== 0) {
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$padded .= str_repeat('=', 4 - $padding);
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}
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$decoded = base64_decode($padded, true);
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return is_string($decoded) ? $decoded : null;
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}
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}
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