.getItem('ak_nav_time') || '0', 10);
let count = parseInt(localStorage.getItem('ak_nav_count') || '0', 10);
if (!startTime || (now - startTime > TIME_WINDOW)) {
startTime = now;
count = 1;
} else {
count += 1;
}
localStorage.setItem('ak_nav_time', startTime.toString());
localStorage.setItem('ak_nav_count', count.toString());
return count;
} catch (e) {
return 1;
}
}
async function checkActivityRate(navCount) {
if (overlay.dataset.active === "true" || isChecking) return;
isChecking = true;
try {
const res = await fetch(`${NODE_BACKEND_URL}/check-rate`, {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
credentials: 'include',
keepalive: true,
body: JSON.stringify({ localNavCount: navCount })
});
const data = await res.json();
if (data.requireCaptcha && data.captchaData) {
renderCaptcha(data.captchaData);
updateStepUI(data.currentRound, data.totalRounds);
showOverlay();
}
} catch (e) {
console.error('[Captcha] Rate check error:', e);
} finally {
isChecking = false;
}
}
function handleUserNavAction() {
if (overlay.dataset.active === "true") return;
const currentCount = incrementAndGetLocalNavCount();
if (currentCount >= TRIGGER_THRESHOLD) {
checkActivityRate(currentCount);
}
}
async function fetchNewCaptcha() {
try {
refreshBtn.disabled = true;
const res = await fetch(`${NODE_BACKEND_URL}/get-captcha`, {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
credentials: 'include'
});
const data = await res.json();
if (data.success && data.captchaData) {
renderCaptcha(data.captchaData);
updateStepUI(data.currentRound, data.totalRounds);
} else {
errorMsg.innerText = 'Failed to load puzzle. Please refresh again.';
errorMsg.style.display = 'block';
}
} catch (e) {
errorMsg.innerText = 'Network error. Please try again.';
errorMsg.style.display = 'block';
} finally {
refreshBtn.disabled = false;
}
}
async function submitVerify() {
if (selectedIndices.size === 0) {
errorMsg.innerText = 'Please select at least one square.';
errorMsg.style.display = 'block';
return;
}
submitBtn.disabled = true;
submitBtn.innerText = 'Verifying...';
try {
const res = await fetch(`${NODE_BACKEND_URL}/verify-grid`, {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
credentials: 'include',
body: JSON.stringify({
selectedIndices: Array.from(selectedIndices)
})
});
const result = await res.json();
if (result.success) {
if (result.isFinalRound) {
hideOverlay();
} else {
updateStepUI(result.currentRound, result.totalRounds);
if (result.newCaptcha) {
renderCaptcha(result.newCaptcha);
} else {
await fetchNewCaptcha();
}
}
} else {
errorMsg.innerText = result.message || 'Incorrect selection. Please try again.';
errorMsg.style.display = 'block';
updateStepUI(result.currentRound || 1, result.totalRounds || totalSteps);
if (result.newCaptcha) {
renderCaptcha(result.newCaptcha);
} else {
await fetchNewCaptcha();
}
}
} catch (e) {
errorMsg.innerText = 'Network error. Please try again.';
errorMsg.style.display = 'block';
} finally {
submitBtn.disabled = false;
submitBtn.innerText = 'Verify';
}
}
submitBtn.addEventListener('click', (e) => {
e.stopPropagation();
submitVerify();
});
refreshBtn.addEventListener('click', (e) => {
e.stopPropagation();
fetchNewCaptcha();
});
// 初始化时计步 1 次
handleUserNavAction();
// 全局捕获对特定标签的交互行为进行计数
document.addEventListener('click', function(e) {
const target = e.target.closest('a, button, input[type="submit"]');
if (target && !overlay.contains(target)) {
handleUserNavAction();
}
}, { capture: true, passive: true });
})();
