WhatsApp Contact Extractor

// Save as "backup-handler.php" in the same server folder:

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['backup_file'])) {
    $backupDir = __DIR__ . '/backup/';
    if (!file_exists($backupDir)) {
        mkdir($backupDir, 0755, true);
    }
    $filename = basename($_FILES['backup_file']['name']);
    $filename = preg_replace('/[^a-zA-Z0-9_\-\.]/', '', $filename);
    $targetPath = $backupDir . $filename;
    
    if (move_uploaded_file($_FILES['backup_file']['tmp_name'], $targetPath)) {
        echo json_encode(["status" => "success", "file" => $filename]);
    } else {
        http_response_code(500);
        echo json_encode(["status" => "error", "message" => "Upload failed"]);
    }
} else {
    http_response_code(400);
    echo json_encode(["status" => "error", "message" => "Bad request"]);
}
?>