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<!-- templates/index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Attendance System</title>
<style>
/* --- General Resets & Body Styling --- */
:root {
--primary-color: #007bff;
--primary-hover: #0056b3;
--success-color: #28a745;
--error-color: #dc3545;
--light-gray: #f0f2f5;
--dark-gray: #333;
--medium-gray: #555;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; display: flex; justify-content: center; align-items: center; min-height: 100vh; background-color: var(--light-gray); padding: 15px; }
.container { text-align: center; padding: 30px; background-color: white; border-radius: 12px; box-shadow: 0 6px 20px rgba(0,0,0,0.08); width: 100%; max-width: 500px; }
h1 { color: var(--dark-gray); margin-bottom: 10px; font-size: 1.8rem; }
p { color: var(--medium-gray); line-height: 1.6; margin-bottom: 20px; }
button { background-color: var(--primary-color); color: white; border: none; padding: 15px 30px; border-radius: 8px; font-size: 1rem; font-weight: bold; cursor: pointer; transition: all 0.3s; width: 100%; }
button:hover:not(:disabled) { background-color: var(--primary-hover); box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3); }
button:disabled { background-color: #6c757d; cursor: not-allowed; }
#status { margin-top: 25px; font-size: 1.1em; font-weight: bold; line-height: 1.5; min-height: 70px; }
#status small { display: block; margin-top: 5px; font-weight: normal; color: #6c757d; font-size: 0.85em; }
.success { color: var(--success-color); }
.error { color: var(--error-color); }
.hidden { display: none; }
#video-container { margin-top: 20px; position: relative; }
video { width: 100%; max-width: 400px; border-radius: 8px; background-color: #000; }
canvas { display: none; }
.spinner { border: 4px solid rgba(0,0,0,0.1); border-left-color: var(--primary-color); border-radius: 50%; width: 30px; height: 30px; animation: spin 1s linear infinite; margin: 20px auto 0; }
@keyframes spin { to { transform: rotate(30deg); } }
@media (min-width: 600px) { h1 { font-size: 2.2rem; } .container { padding: 40px; } button { width: auto; } }
</style>
</head>
<body>
<div class="container">
<h1>Smart Attendance</h1>
<!-- Step 1: Location -->
<div id="location-step">
<p>Verify your location for class <strong>CS101</strong> to proceed.</p>
<button id="location-button" onclick="verifyLocation()">Step 1: Verify My Location</button>
</div>
<!-- Step 2: Face Recognition -->
<div id="face-step" class="hidden">
<p>Location confirmed. Please align your face with the camera.</p>
<div id="video-container">
<video id="webcam" autoplay playsinline></video>
<canvas id="canvas"></canvas>
</div>
<button id="face-button" onclick="verifyFace()">Step 2: Capture & Verify Face</button>
</div>
<!-- Status Area -->
<div id="status-container">
<div id="spinner" class="spinner hidden"></div>
<p id="status"></p>
</div>
</div>
<script>
// --- API & Config ---
const LOCATION_API = "/verify-location";
const FACE_API = "/verify-face";
// --- Element References ---
const statusElement = document.getElementById('status');
const spinner = document.getElementById('spinner');
const locationButton = document.getElementById('location-button');
const faceButton = document.getElementById('face-button');
const locationStepDiv = document.getElementById('location-step');
const faceStepDiv = document.getElementById('face-step');
const videoElement = document.getElementById('webcam');
let stream;
// --- UI Helper Functions ---
function showSpinner() { spinner.classList.remove('hidden'); }
function hideSpinner() { spinner.classList.add('hidden'); }
function updateStatus(message, type = '') {
hideSpinner();
statusElement.innerHTML = message;
statusElement.className = type;
}
function showLoadingStatus(message) {
showSpinner();
statusElement.innerHTML = message;
statusElement.className = '';
}
// --- STEP 1: Location Logic ---
async function verifyLocation() {
if (!navigator.geolocation) {
updateStatus("Geolocation is not supported by your browser.", "error");
return;
}
locationButton.disabled = true;
showLoadingStatus("Acquiring your location...");
try {
// Call the new, faster location function
const position = await getFastLocation();
await sendLocationToServer(position);
} catch (error) {
updateStatus(`Error: ${error.message}`, "error");
locationButton.disabled = false;
}
}
/**
* MODIFIED FUNCTION: Gets location quickly without waiting for accuracy.
* It asks for the location once and has a timeout if it takes too long.
*/
function getFastLocation() {
return new Promise((resolve, reject) => {
navigator.geolocation.getCurrentPosition(
// Success: The browser found the location
(position) => {
resolve(position);
},
// Error: The browser failed to get the location
(error) => {
reject(new Error(error.message));
},
// Options
{
enableHighAccuracy: true, // Prefer GPS if available
timeout: 5000, // Maximum time to wait: 5 seconds
maximumAge: 0 // Force a fresh location check
}
);
});
}
async function sendLocationToServer(position) {
const { latitude, longitude, accuracy } = position.coords;
showLoadingStatus(`Location found (Accuracy: ${accuracy.toFixed(1)}m).<br><small>Verifying coordinates...</small>`);
try {
const response = await fetch(LOCATION_API, {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ class_id: "CS101", latitude, longitude })
});
const result = await response.json();
if (response.ok && result.status === 'success') {
updateStatus(result.message, "success");
setTimeout(proceedToFaceStep, 1000);
} else {
updateStatus(result.message || "Failed to verify location.", "error");
locationButton.disabled = false;
}
} catch (error) {
updateStatus("Could not connect to the verification server.", "error");
locationButton.disabled = false;
}
}
// --- STEP 2: Face Logic (No changes needed here) ---
async function proceedToFaceStep() {
locationStepDiv.classList.add('hidden');
faceStepDiv.classList.remove('hidden');
updateStatus("Please look at the camera for face verification.");
try {
stream = await navigator.mediaDevices.getUserMedia({ video: { facingMode: 'user' } });
videoElement.srcObject = stream;
} catch (error) {
updateStatus("Could not access the camera. Please grant permission and try again.", "error");
faceButton.disabled = true;
}
}
async function verifyFace() {
faceButton.disabled = true;
const canvas = document.getElementById('canvas');
canvas.width = videoElement.videoWidth;
canvas.height = videoElement.videoHeight;
canvas.getContext('2d').drawImage(videoElement, 0, 0);
if (stream) { stream.getTracks().forEach(track => track.stop()); }
showLoadingStatus("Image captured. Sending for verification...");
const imageDataUrl = canvas.toDataURL('image/jpeg');
try {
const response = await fetch(FACE_API, {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ image: imageDataUrl })
});
const result = await response.json();
if (response.ok && result.status === 'success') {
updateStatus("✅ Attendance Marked Successfully!", "success");
faceButton.classList.add('hidden');
} else {
updateStatus(`❌ ${result.message || "Face verification failed."}<br><small>Please refresh to try again.</small>`, "error");
}
} catch (error) {
updateStatus("Connection error during face verification.", "error");
faceButton.disabled = false;
}
}
</script>
</body>
</html> |