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descargar_orden: detección MIME por magic bytes (fix .bin)

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This commit is contained in:
Lizandro Guarnizo
2026-03-17 15:09:02 -05:00
parent 9e5a7017e1
commit 8e15ccc6b4
1 changed files with 31 additions and 5 deletions
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api/lab/descargar_orden.php
+31 -5
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@@ -46,12 +46,38 @@ if (!$path || !$base || strpos($path, $base) !== 0 || !is_file($path)) {
exit;
}
// Detectar MIME real
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mime = finfo_file($finfo, $path);
finfo_close($finfo);
// Detectar MIME real — 3 capas para máxima fiabilidad con archivos .bin
// Mapa de extensiones como fallback
// Capa 1: finfo (usa magic bytes internamente)
$mime = '';
if (function_exists('finfo_open')) {
$fi = finfo_open(FILEINFO_MIME_TYPE);
$mime = $fi ? (string)finfo_file($fi, $path) : '';
if ($fi) finfo_close($fi);
}
// Capa 2: Lectura manual de magic bytes (funciona aunque finfo falle o devuelva octet-stream)
if (!$mime || $mime === 'application/octet-stream') {
$handle = fopen($path, 'rb');
$bytes = $handle ? fread($handle, 12) : '';
if ($handle) fclose($handle);
if (substr($bytes, 0, 3) === "\xFF\xD8\xFF") {
$mime = 'image/jpeg';
} elseif (substr($bytes, 0, 8) === "\x89PNG\r\n\x1a\n") {
$mime = 'image/png';
} elseif (substr($bytes, 0, 5) === '%PDF-') {
$mime = 'application/pdf';
} elseif (substr($bytes, 0, 6) === 'GIF89a' || substr($bytes, 0, 6) === 'GIF87a') {
$mime = 'image/gif';
} elseif (substr($bytes, 0, 4) === 'RIFF' && substr($bytes, 8, 4) === 'WEBP') {
$mime = 'image/webp';
} elseif (substr($bytes, 0, 2) === 'PK') {
$mime = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
}
}
// Capa 3: Fallback por extensión declarada
$ext = strtolower(pathinfo($fileParam, PATHINFO_EXTENSION));
$mimeMap = [
'pdf' => 'application/pdf',