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69 lines
2.2 KiB
69 lines
2.2 KiB
<?php
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namespace App\Support;
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use Illuminate\Validation\ValidationException;
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/**
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* 上传文件名校验：只信任最后一个后缀，拒绝空字节与危险后缀段。
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*/
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final class UploadFilenameGuard
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{
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/** @var list<string> */
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public const DENIED_EXTENSIONS = [
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'php', 'phtml', 'phar', 'php3', 'php4', 'php5', 'php7', 'php8',
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'pht', 'phps', 'shtml', 'cgi', 'exe', 'js', 'html', 'htm', 'svg',
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];
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/**
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* @param list<string> $allowedExtensions
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*/
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public static function lastAllowedExtension(string $originalName, array $allowedExtensions): string
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{
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if ($originalName === '' || str_contains($originalName, "\0") || str_contains(strtolower($originalName), '%00')) {
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throw ValidationException::withMessages([
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'file' => ['文件名非法'],
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]);
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}
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$normalized = str_replace('\\', '/', $originalName);
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$basename = basename($normalized);
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if ($basename === '' || $basename === '.' || $basename === '..') {
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throw ValidationException::withMessages([
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'file' => ['文件名非法'],
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]);
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}
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$parts = explode('.', $basename);
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if (count($parts) < 2) {
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throw ValidationException::withMessages([
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'file' => ['不支持的文件类型'],
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]);
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}
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$last = strtolower((string) array_pop($parts));
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if ($last === '' || ! in_array($last, $allowedExtensions, true)) {
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throw ValidationException::withMessages([
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'file' => ['不支持的文件类型'],
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]);
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}
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if (in_array($last, self::DENIED_EXTENSIONS, true)) {
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throw ValidationException::withMessages([
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'file' => ['不支持的文件类型'],
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]);
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}
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foreach ($parts as $part) {
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$segment = strtolower((string) $part);
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if ($segment !== '' && in_array($segment, self::DENIED_EXTENSIONS, true)) {
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throw ValidationException::withMessages([
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'file' => ['不支持的文件类型'],
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]);
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}
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}
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return $last;
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}
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}
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