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* IdleSession: Seamless, multi-tab session orchestration for the modern web.
*/
export class IdleSession {
constructor({
timeout = 900000,
heartbeatInterval = 300000,
warningBefore = 60000,
channelName = 'session_sync',
onHeartbeat = async () => {
try {
const res = await fetch('/api/keep-alive', { method: 'POST' });
if (res.status === 401 || res.status === 403) throw new Error('Unauthorized');
} catch (err) {
// Only hard auth failures propagate — transient network errors are
// swallowed so connectivity blips don't end the session.
if (err.message === 'Unauthorized') throw err;
}
},
onLogout = () => window.location.href = '/logout',
onWarning = undefined,
} = {}) {
this.timeout = timeout;
this.heartbeatInterval = heartbeatInterval;
this.warningBefore = warningBefore;
this.onHeartbeat = onHeartbeat;
this.logout = onLogout;
this.onWarning = onWarning;
this.channelName = channelName;
this.channel = new BroadcastChannel(channelName);
this.timer = null;
this.warningTimer = null;
this.needsHeartbeat = false;
this._lastHandled = 0;
this._lastActiveAt = Date.now();
this.init();
}
init() {
this.channel.onmessage = (e) => { if (e.data === 'USER_ACTIVE') this.resetTimers(); };
this._activityHandler = () => this.handleActivity();
this._trackedEvents = ['mousedown', 'mousemove', 'keydown', 'scroll', 'touchstart', 'focus', 'input'];
this._trackedEvents.forEach(evt => window.addEventListener(evt, this._activityHandler, { passive: true }));
this._visibilityHandler = () => {
if (document.visibilityState !== 'visible') return;
const elapsed = Date.now() - this._lastActiveAt;
if (elapsed >= this.timeout) {
this._doLogout();
} else {
// Re-sync timers against wall-clock time in case JS was frozen
clearTimeout(this.timer);
this.timer = setTimeout(() => this._doLogout(), this.timeout - elapsed);
const warnAt = this.timeout - this.warningBefore - elapsed;
clearTimeout(this.warningTimer);
if (warnAt > 0) {
this.warningTimer = this.onWarning
? setTimeout(() => this.onWarning({ extend: () => this.handleActivity(), logout: () => this._doLogout() }), warnAt)
: setTimeout(() => this.renderWarningModal(), warnAt);
} else {
// Warning window has already passed — show it immediately
this.onWarning
? this.onWarning({ extend: () => this.handleActivity(), logout: () => this._doLogout() })
: this.renderWarningModal();
}
}
};
document.addEventListener('visibilitychange', this._visibilityHandler);
this.resetTimers();
this._heartbeatInterval = setInterval(() => this.triggerHeartbeat(), this.heartbeatInterval);
}
handleActivity() {
const now = Date.now();
if (now - this._lastHandled < 500) return;
this._lastHandled = now;
this.needsHeartbeat = true;
this.channel.postMessage('USER_ACTIVE');
this.resetTimers();
}
resetTimers() {
this._lastActiveAt = Date.now();
clearTimeout(this.timer);
this.timer = setTimeout(() => this._doLogout(), this.timeout);
const warnAt = this.timeout - this.warningBefore;
if (warnAt > 0) {
clearTimeout(this.warningTimer);
this.warningTimer = this.onWarning
? setTimeout(() => this.onWarning({ extend: () => this.handleActivity(), logout: () => this._doLogout() }), warnAt)
: setTimeout(() => this.renderWarningModal(), warnAt);
}
}
async triggerHeartbeat() {
if (!this.needsHeartbeat) return;
try {
await this.onHeartbeat();
this.needsHeartbeat = false;
} catch (err) {
console.error('Heartbeat failed, logging out.', err);
this._doLogout();
}
}
_doLogout() {
const modal = document.getElementById('idle-warning-modal');
if (modal) { modal.close(); modal.remove(); }
this.logout();
}
destroy() {
clearTimeout(this.timer);
clearTimeout(this.warningTimer);
clearInterval(this._heartbeatInterval);
this._trackedEvents.forEach(evt => window.removeEventListener(evt, this._activityHandler));
document.removeEventListener('visibilitychange', this._visibilityHandler);
this.channel.close();
const modal = document.getElementById('idle-warning-modal');
if (modal) { modal.close(); modal.remove(); }
}
renderWarningModal() {
if (document.getElementById('idle-warning-modal')) return;
if (!document.getElementById('idle-warning-styles')) {
document.head.insertAdjacentHTML('beforeend', `<style id="idle-warning-styles">
#idle-warning-modal {
padding: 2rem;
border-radius: 10px;
border: 1px solid var(--idle-border, #e5e7eb);
background: var(--idle-bg, #ffffff);
color: var(--idle-color, #111827);
max-width: 380px;
width: 90vw;
box-shadow: 0 20px 60px rgba(0,0,0,0.25);
font-family: system-ui, -apple-system, sans-serif;
margin: auto;
}
#idle-warning-modal::backdrop {
background: rgba(0,0,0,0.45);
}
#idle-warning-modal h2 {
margin: 0 0 0.5rem;
font-size: 1.1rem;
font-weight: 600;
color: var(--idle-heading, var(--idle-color, #111827));
}
#idle-warning-modal p {
margin: 0 0 1.5rem;
font-size: 0.875rem;
line-height: 1.55;
color: var(--idle-muted, #6b7280);
}
#idle-warning-modal footer {
display: flex;
gap: 0.5rem;
justify-content: flex-end;
}
#idle-warning-modal button {
padding: 0.45rem 1.1rem;
border-radius: 6px;
font-size: 0.875rem;
font-family: inherit;
cursor: pointer;
border: 1px solid transparent;
font-weight: 500;
transition: opacity 0.15s;
}
#idle-warning-modal button:hover { opacity: 0.8; }
#stay-logged-in {
background: var(--idle-accent, #2563eb);
color: var(--idle-accent-text, #ffffff);
border-color: var(--idle-accent, #2563eb);
font-weight: 600;
}
#logout-now {
background: transparent;
color: var(--idle-muted, #6b7280);
border-color: var(--idle-border, #e5e7eb);
}
</style>`);
}
document.body.insertAdjacentHTML('beforeend', `
<dialog id="idle-warning-modal">
<h2>Session Expiring</h2>
<p>Your session will end soon due to inactivity.</p>
<footer>
<button id="stay-logged-in">Stay Logged In</button>
<button id="logout-now">Log Out</button>
</footer>
</dialog>
`);
const dialog = document.getElementById('idle-warning-modal');
dialog.showModal();
document.getElementById('stay-logged-in').onclick = () => { dialog.close(); dialog.remove(); this.handleActivity(); };
document.getElementById('logout-now').onclick = () => this._doLogout();
}
}
export default IdleSession;
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