feat: introduce notification system and claude notifications (#450)

* feat: introduce notification system and claude notifications

* fix(sw): prevent caching of API requests and WebSocket upgrades

* default to false for webpush notifications and translations for the button

* fix: notifications orchestrator and add a notification when  first enabled

* fix: remove unused state update and dependency in settings controller hook

* fix: show notifications settings tab

* fix: add notifications for response completion for all providers

* feat: show session name in notification and don't reload tab on clicking
--- the notification

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Haileyesus <something@gmail.com>

server/services/notification-orchestrator.js

@@ -0,0 +1,227 @@
+import webPush from 'web-push';
+import { notificationPreferencesDb, pushSubscriptionsDb, sessionNamesDb } from '../database/db.js';
+
+const KIND_TO_PREF_KEY = {
+  action_required: 'actionRequired',
+  stop: 'stop',
+  error: 'error'
+};
+
+const PROVIDER_LABELS = {
+  claude: 'Claude',
+  cursor: 'Cursor',
+  codex: 'Codex',
+  gemini: 'Gemini',
+  system: 'System'
+};
+
+const recentEventKeys = new Map();
+const DEDUPE_WINDOW_MS = 20000;
+
+const cleanupOldEventKeys = () => {
+  const now = Date.now();
+  for (const [key, timestamp] of recentEventKeys.entries()) {
+    if (now - timestamp > DEDUPE_WINDOW_MS) {
+      recentEventKeys.delete(key);
+    }
+  }
+};
+
+function shouldSendPush(preferences, event) {
+  const webPushEnabled = Boolean(preferences?.channels?.webPush);
+  const prefEventKey = KIND_TO_PREF_KEY[event.kind];
+  const eventEnabled = prefEventKey ? Boolean(preferences?.events?.[prefEventKey]) : true;
+
+  return webPushEnabled && eventEnabled;
+}
+
+function isDuplicate(event) {
+  cleanupOldEventKeys();
+  const key = event.dedupeKey || `${event.provider}:${event.kind || 'info'}:${event.code || 'generic'}:${event.sessionId || 'none'}`;
+  if (recentEventKeys.has(key)) {
+    return true;
+  }
+  recentEventKeys.set(key, Date.now());
+  return false;
+}
+
+function createNotificationEvent({
+  provider,
+  sessionId = null,
+  kind = 'info',
+  code = 'generic.info',
+  meta = {},
+  severity = 'info',
+  dedupeKey = null,
+  requiresUserAction = false
+}) {
+  return {
+    provider,
+    sessionId,
+    kind,
+    code,
+    meta,
+    severity,
+    requiresUserAction,
+    dedupeKey,
+    createdAt: new Date().toISOString()
+  };
+}
+
+function normalizeErrorMessage(error) {
+  if (typeof error === 'string') {
+    return error;
+  }
+
+  if (error && typeof error.message === 'string') {
+    return error.message;
+  }
+
+  if (error == null) {
+    return 'Unknown error';
+  }
+
+  return String(error);
+}
+
+function normalizeSessionName(sessionName) {
+  if (typeof sessionName !== 'string') {
+    return null;
+  }
+
+  const normalized = sessionName.replace(/\s+/g, ' ').trim();
+  if (!normalized) {
+    return null;
+  }
+
+  return normalized.length > 80 ? `${normalized.slice(0, 77)}...` : normalized;
+}
+
+function resolveSessionName(event) {
+  const explicitSessionName = normalizeSessionName(event.meta?.sessionName);
+  if (explicitSessionName) {
+    return explicitSessionName;
+  }
+
+  if (!event.sessionId || !event.provider) {
+    return null;
+  }
+
+  return normalizeSessionName(sessionNamesDb.getName(event.sessionId, event.provider));
+}
+
+function buildPushBody(event) {
+  const CODE_MAP = {
+    'permission.required': event.meta?.toolName
+      ? `Action Required: Tool "${event.meta.toolName}" needs approval`
+      : 'Action Required: A tool needs your approval',
+    'run.stopped': event.meta?.stopReason || 'Run Stopped: The run has stopped',
+    'run.failed': event.meta?.error ? `Run Failed: ${event.meta.error}` : 'Run Failed: The run encountered an error',
+    'agent.notification': event.meta?.message ? String(event.meta.message) : 'You have a new notification',
+    'push.enabled': 'Push notifications are now enabled!'
+  };
+  const providerLabel = PROVIDER_LABELS[event.provider] || 'Assistant';
+  const sessionName = resolveSessionName(event);
+  const message = CODE_MAP[event.code] || 'You have a new notification';
+
+  return {
+    title: sessionName || 'Claude Code UI',
+    body: `${providerLabel}: ${message}`,
+    data: {
+      sessionId: event.sessionId || null,
+      code: event.code,
+      provider: event.provider || null,
+      sessionName,
+      tag: `${event.provider || 'assistant'}:${event.sessionId || 'none'}:${event.code}`
+    }
+  };
+}
+
+async function sendWebPush(userId, event) {
+  const subscriptions = pushSubscriptionsDb.getSubscriptions(userId);
+  if (!subscriptions.length) return;
+
+  const payload = JSON.stringify(buildPushBody(event));
+
+  const results = await Promise.allSettled(
+    subscriptions.map((sub) =>
+      webPush.sendNotification(
+        {
+          endpoint: sub.endpoint,
+          keys: {
+            p256dh: sub.keys_p256dh,
+            auth: sub.keys_auth
+          }
+        },
+        payload
+      )
+    )
+  );
+
+  // Clean up gone subscriptions (410 Gone or 404)
+  results.forEach((result, index) => {
+    if (result.status === 'rejected') {
+      const statusCode = result.reason?.statusCode;
+      if (statusCode === 410 || statusCode === 404) {
+        pushSubscriptionsDb.removeSubscription(subscriptions[index].endpoint);
+      }
+    }
+  });
+}
+
+function notifyUserIfEnabled({ userId, event }) {
+  if (!userId || !event) {
+    return;
+  }
+
+  const preferences = notificationPreferencesDb.getPreferences(userId);
+  if (!shouldSendPush(preferences, event)) {
+    return;
+  }
+  if (isDuplicate(event)) {
+    return;
+  }
+
+  sendWebPush(userId, event).catch((err) => {
+    console.error('Web push send error:', err);
+  });
+}
+
+function notifyRunStopped({ userId, provider, sessionId = null, stopReason = 'completed', sessionName = null }) {
+  notifyUserIfEnabled({
+    userId,
+    event: createNotificationEvent({
+      provider,
+      sessionId,
+      kind: 'stop',
+      code: 'run.stopped',
+      meta: { stopReason, sessionName },
+      severity: 'info',
+      dedupeKey: `${provider}:run:stop:${sessionId || 'none'}:${stopReason}`
+    })
+  });
+}
+
+function notifyRunFailed({ userId, provider, sessionId = null, error, sessionName = null }) {
+  const errorMessage = normalizeErrorMessage(error);
+
+  notifyUserIfEnabled({
+    userId,
+    event: createNotificationEvent({
+      provider,
+      sessionId,
+      kind: 'error',
+      code: 'run.failed',
+      meta: { error: errorMessage, sessionName },
+      severity: 'error',
+      dedupeKey: `${provider}:run:error:${sessionId || 'none'}:${errorMessage}`
+    })
+  });
+}
+
+export {
+  createNotificationEvent,
+  notifyUserIfEnabled,
+  notifyRunStopped,
+  notifyRunFailed
+};