add support for session:redirect event

lib/client.js

@@ -33,6 +33,9 @@ class Client extends Emitter {
         case 'session:adulting':
           this._onSessionAdulting(ws, path, msg);
           break;
+        case 'session:redirect':
+          this._onSessionRedirect(ws, path, msg);
+          break;
         default:
           debug(`Client: discarding msg type ${msg.type}`);
       }
@@ -61,6 +64,23 @@ class Client extends Emitter {
     ws.off('message', this._boundHandler);
     this.emit('session:new', session, path, ws.req);
   }
+
+  _onSessionRedirect(ws, path, msg) {
+    const logger = typeof this.logger.child === 'function' ?
+      this.logger.child({call_sid: msg.call_sid}) :
+      this.logger;
+    const session = new Session({logger, ws, msg});
+    /* Note: all further messaging after session:new will be handled by the session */
+    ws.off('message', this._boundHandler);
+    session.reply();
+
+    // Check if there are listeners for "session:redirect", otherwise emit "session:new"
+    if (this.listenerCount('session:redirect') > 0) {
+      this.emit('session:redirect', session, path, ws.req);
+    } else {
+      this.emit('session:new', session, path, ws.req);
+    }
+  }
 }
 
 module.exports = Client;