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<?php
/* upload.php — handle image uploads */
header('Content-Type: application/json');
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
http_response_code(405);
echo json_encode(['error' => 'Method not allowed']);
exit;
}
if (!isset($_FILES['image']) || $_FILES['image']['error'] !== UPLOAD_ERR_OK) {
$code = $_FILES['image']['error'] ?? 'unknown';
http_response_code(400);
echo json_encode(['error' => "Upload failed (code: $code)"]);
exit;
}
$file = $_FILES['image'];
$allowed = [
'image/png', 'image/jpeg', 'image/gif',
'image/webp', 'image/svg+xml', 'image/bmp',
];
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mime = finfo_file($finfo, $file['tmp_name']);
finfo_close($finfo);
if (!in_array($mime, $allowed, true)) {
http_response_code(400);
echo json_encode(['error' => "Invalid file type: $mime"]);
exit;
}
$ext = match ($mime) {
'image/png' => 'png',
'image/jpeg' => 'jpg',
'image/gif' => 'gif',
'image/webp' => 'webp',
'image/svg+xml' => 'svg',
'image/bmp' => 'bmp',
default => 'bin',
};
/* generate safe filename */
$basename = pathinfo($file['name'], PATHINFO_FILENAME);
$basename = preg_replace('/[^a-zA-Z0-9_-]/', '_', $basename);
$basename = substr($basename, 0, 64);
$filename = $basename . '_' . bin2hex(random_bytes(4)) . '.' . $ext;
$uploadDir = __DIR__ . '/uploads';
if (!is_dir($uploadDir)) {
mkdir($uploadDir, 0755, true);
}
$dest = $uploadDir . '/' . $filename;
if (!move_uploaded_file($file['tmp_name'], $dest)) {
http_response_code(500);
echo json_encode(['error' => 'Failed to save file']);
exit;
}
echo json_encode([
'filename' => $filename,
'url' => 'uploads/' . $filename,
]);
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