feat: add Baileys WhatsApp session with reconnect logic

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/worker/package.json

@@ -8,6 +8,7 @@
     "test": "jest"
   },
   "dependencies": {
+    "@hapi/boom": "^10.0.1",
     "@tower/config": "workspace:*",
     "@tower/logger": "workspace:*",
     "@tower/types": "workspace:*",

apps/worker/src/whatsapp/session.ts

@@ -0,0 +1,58 @@
+import makeWASocket, {
+  useMultiFileAuthState,
+  fetchLatestBaileysVersion,
+  DisconnectReason,
+  WASocket,
+  proto,
+  GroupMetadata,
+} from '@whiskeysockets/baileys';
+import { Boom } from '@hapi/boom';
+import { createLogger } from '@tower/logger';
+
+const logger = createLogger('whatsapp-session');
+
+export type OnMessageCallback = (msg: proto.IWebMessageInfo) => void;
+export type OnGroupsCallback = (groups: Record<string, GroupMetadata>) => void;
+
+export async function createWhatsAppSession(
+  sessionPath: string,
+  onMessage: OnMessageCallback,
+  onGroups: OnGroupsCallback,
+): Promise<WASocket> {
+  const { state, saveCreds } = await useMultiFileAuthState(sessionPath);
+  const { version } = await fetchLatestBaileysVersion();
+
+  const sock = makeWASocket({
+    version,
+    auth: state,
+    printQRInTerminal: true,
+    logger: logger as any,
+  });
+
+  sock.ev.on('creds.update', saveCreds);
+
+  sock.ev.on('connection.update', async ({ connection, lastDisconnect }) => {
+    if (connection === 'close') {
+      const reason = (lastDisconnect?.error as Boom)?.output?.statusCode;
+      const shouldReconnect = reason !== DisconnectReason.loggedOut;
+      logger.info({ reason, shouldReconnect }, 'Connection closed');
+      if (shouldReconnect) {
+        logger.info('Reconnecting in 5s...');
+        setTimeout(() => createWhatsAppSession(sessionPath, onMessage, onGroups), 5000);
+      }
+    } else if (connection === 'open') {
+      logger.info('WhatsApp connected');
+      const groups = await sock.groupFetchAllParticipating();
+      onGroups(groups);
+    }
+  });
+
+  sock.ev.on('messages.upsert', ({ messages, type }) => {
+    if (type !== 'notify') return;
+    for (const msg of messages) {
+      onMessage(msg);
+    }
+  });
+
+  return sock;
+}

pnpm-lock.yaml

@@ -142,6 +142,9 @@ importers:
 
   apps/worker:
     dependencies:
+      '@hapi/boom':
+        specifier: ^10.0.1
+        version: 10.0.1
       '@tower/config':
         specifier: workspace:*
         version: link:../../packages/config
@@ -459,9 +462,15 @@ packages:
   '@emnapi/runtime@1.10.0':
     resolution: {integrity: sha512-ewvYlk86xUoGI0zQRNq/mC+16R1QeDlKQy21Ki3oSYXNgLb45GV1P6A0M+/s6nyCuNDqe5VpaY84BzXGwVbwFA==}
 
+  '@hapi/boom@10.0.1':
+    resolution: {integrity: sha512-ERcCZaEjdH3OgSJlyjVk8pHIFeus91CjKP3v+MpgBNp5IvGzP2l/bRiD78nqYcKPaZdbKkK5vDBVPd2ohHBlsA==}
+
   '@hapi/boom@9.1.4':
     resolution: {integrity: sha512-Ls1oH8jaN1vNsqcaHVYJrKmgMcKsC1wcp8bujvXrHaAqD2iDYq3HoOwsxwo09Cuda5R5nC0o0IxlrlTuvPuzSw==}
 
+  '@hapi/hoek@11.0.7':
+    resolution: {integrity: sha512-HV5undWkKzcB4RZUusqOpcgxOaq6VOAH7zhhIr2g3G8NF/MlFO75SjOr2NfuSx0Mh40+1FqCkagKLJRykUWoFQ==}
+
   '@hapi/hoek@9.3.0':
     resolution: {integrity: sha512-/c6rf4UJlmHlC9b5BaNvzAcFv7HZ2QHaV0D4/HNlBdvFnvQq8RI4kYdhyPCl7Xj+oWvTWQ8ujhqS53LIgAe6KQ==}
 
@@ -4025,10 +4034,16 @@ snapshots:
       tslib: 2.8.1
     optional: true
 
+  '@hapi/boom@10.0.1':
+    dependencies:
+      '@hapi/hoek': 11.0.7
+
   '@hapi/boom@9.1.4':
     dependencies:
       '@hapi/hoek': 9.3.0
 
+  '@hapi/hoek@11.0.7': {}
+
   '@hapi/hoek@9.3.0': {}
 
   '@img/colour@1.1.0': {}