78 lines
2.4 KiB
PHP
78 lines
2.4 KiB
PHP
<?php
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namespace App\Rules;
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use Closure;
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use Illuminate\Contracts\Validation\ValidationRule;
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use Illuminate\Http\UploadedFile;
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class ValidAudioMagicBytes implements ValidationRule
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{
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// Signatures checked at byte offset 0
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private const SIGNATURES = [
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[0xFF, 0xFB], // MP3 MPEG-1 Layer 3
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[0xFF, 0xF3], // MP3 MPEG-2 Layer 3
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[0xFF, 0xF2], // MP3 MPEG-2.5 Layer 3
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[0xFF, 0xF1], // AAC ADTS MPEG-4
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[0xFF, 0xF9], // AAC ADTS MPEG-2
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[0x49, 0x44, 0x33], // MP3 with ID3v2 tag
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[0x52, 0x49, 0x46, 0x46], // WAV (RIFF header)
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[0x4F, 0x67, 0x67, 0x53], // OGG (OggS)
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[0x66, 0x4C, 0x61, 0x43], // FLAC (fLaC)
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[0x1A, 0x45, 0xDF, 0xA3], // WebM / MKV
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];
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// MP4/M4A: ISO Base Media file — 'ftyp' box starts at byte offset 4
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private const MP4_SIGNATURE = [0x66, 0x74, 0x79, 0x70]; // 'ftyp'
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private const MP4_OFFSET = 4;
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public function validate(string $attribute, mixed $value, Closure $fail): void
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{
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if (! ($value instanceof UploadedFile) || ! $value->isValid()) {
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$fail('Fail audio tidak sah.');
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return;
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}
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$handle = @fopen($value->getRealPath(), 'rb');
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if ($handle === false) {
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$fail('Fail audio tidak dapat dibaca.');
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return;
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}
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$header = fread($handle, 12);
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fclose($handle);
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if (strlen($header) < 4) {
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$fail('Fail audio terlalu kecil atau rosak.');
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return;
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}
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$bytes = array_values(unpack('C*', $header));
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foreach (self::SIGNATURES as $sig) {
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if ($this->matchesAt($bytes, $sig, 0)) {
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return;
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}
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}
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// Check MP4/M4A: need at least 8 bytes
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if (count($bytes) >= self::MP4_OFFSET + count(self::MP4_SIGNATURE)) {
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if ($this->matchesAt($bytes, self::MP4_SIGNATURE, self::MP4_OFFSET)) {
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return;
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}
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}
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$fail('Format fail audio tidak sah. Kandungan fail tidak menepati format audio yang dibenarkan.');
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}
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private function matchesAt(array $bytes, array $signature, int $offset): bool
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{
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foreach ($signature as $i => $expected) {
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if (($bytes[$offset + $i] ?? -1) !== $expected) {
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return false;
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}
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}
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return true;
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}
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}
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