if (!$input || !isset($input['visitorId'])) echo json_encode(['success' => false, 'message' => 'Invalid fingerprint data']); exit;

try const response = await fetch('download.php?action=list'); const data = await response.json(); if (data.success && data.files.length > 0) listDiv.innerHTML = ` <ul class="file-list"> $data.files.map(file => ` <li> 📄 $file.name <span class="file-size">($file.size bytes)</span> <span class="file-date">$file.date</span> </li> `).join('') </ul> `; else listDiv.innerHTML = '<p>No saved fingerprints found.</p>'; catch (error) listDiv.innerHTML = `<p class="error">Error loading list: $error.message</p>`;

// Capture fingerprint async function captureFingerprint() const resultDiv = document.getElementById('result'); resultDiv.innerHTML = '<div class="spinner"></div> Capturing fingerprint...'; resultDiv.classList.remove('hidden');

// Generate unique filename $filename = $dataDir . 'fingerprint_' . $input['visitorId'] . '_' . date('Ymd_His') . '.json';