Handling Genesys Cloud WebSocket Session Expiration and Token Renewal in a React Agent Desktop

What You Will Build

A React component that maintains a persistent Genesys Cloud WebSocket connection, intercepts close events triggered by OAuth token expiration, refreshes the access token using the official Client SDK, and reconnects without resetting agent presence or queue subscriptions. This tutorial uses the @genesyscloud/purecloud-platform-client-v2 JavaScript SDK. The implementation is written in TypeScript and React.

Prerequisites

• Genesys Cloud OAuth2 client configured for confidential or public flow with refresh token support
• Required OAuth scopes: agent:login, presence:read, routing:queue:read, webchat:widget
• @genesyscloud/purecloud-platform-client-v2 version 4.15.0 or higher
• Node.js 18.0+ with npm or yarn
• React 18+ with TypeScript
• typescript, @types/react, @types/ws installed in your project

Authentication Setup

The Genesys Cloud Client SDK manages OAuth2 state through the OAuth2Client module. You must initialize the SDK with your client identifier, base URL, and a valid refresh token before creating any WebSocket instance. The SDK caches the access token internally and exposes methods to inspect or refresh it programmatically.

Initialize the SDK in a dedicated configuration module to avoid reinitialization across React renders.

// config/genesys-sdk.ts
import * as platformClient from '@genesyscloud/purecloud-platform-client-v2';

export const initializeGenesysSdk = (
  clientId: string,
  clientSecret: string,
  refreshToken: string,
  environment: 'mypurecloud.com' | 'euw2.pure.cloud' | 'usw2.pure.cloud'
) => {
  platformClient.init({
    clientId,
    clientSecret,
    baseUrl: `https://${environment}`,
    useSandbox: false
  });

  // Inject the refresh token into the SDK's OAuth2 client
  platformClient.OAuth2Client.setRefreshToken(refreshToken);
  platformClient.OAuth2Client.setClientId(clientId);
  platformClient.OAuth2Client.setClientSecret(clientSecret);

  return platformClient;
};

The SDK requires the agent:login scope to establish WebSocket connections for agent desktop functionality. If your application uses PKCE instead of client secret exchange, replace setClientSecret with setUsePkce(true) and handle the authorization code exchange before calling this module.

Implementation

Step 1: Initialize the Client SDK and Establish the WebSocket Connection

Genesys Cloud exposes real-time agent events through the WebSocket API. The SDK provides platformClient.WebSocketApi.createWebSocket() which returns a standard browser WebSocket instance preconfigured with authentication headers and subscription routing. You must pass the required scopes during initialization and verify the connection state before subscribing to routing or presence channels.

import * as platformClient from '@genesyscloud/purecloud-platform-client-v2';

export const createAgentWebSocket = async (): Promise<WebSocket> => {
  try {
    // Verify the SDK has a valid access token before opening the socket
    const token = await platformClient.OAuth2Client.getAccessToken();
    if (!token) {
      throw new Error('No valid access token available. Initialize OAuth2Client first.');
    }

    const ws = await platformClient.WebSocketApi.createWebSocket();

    ws.onopen = () => {
      console.log('WebSocket connection established');
    };

    ws.onmessage = (event: MessageEvent) => {
      const payload = JSON.parse(event.data);
      console.log('Received Genesys Cloud event:', payload);
    };

    return ws;
  } catch (error) {
    console.error('Failed to create WebSocket:', error);
    throw error;
  }
};

The createWebSocket() method automatically attaches the current access token to the initial handshake. Genesys Cloud validates the token signature and scope claims before upgrading the HTTP connection to WebSocket. If the token lacks presence:read or routing:queue:read, the server closes the connection with code 1008 (Policy Violation).

Step 2: Intercept Close Events and Detect Token Expiration

WebSocket connections terminate for multiple reasons: normal shutdown, server restart, network interruption, or authentication failure. Genesys Cloud uses specific close codes to indicate token expiration. Code 4001 signals an invalid or expired access token. Code 1006 indicates an abnormal closure without a proper close frame. You must inspect the CloseEvent object to determine whether to attempt token refresh or trigger a full reauthentication flow.

export const handleWebSocketClose = (
  event: CloseEvent,
  onTokenExpired: () => Promise<void>,
  onUnexpectedClose: (code: number, reason: string) => void
) => {
  console.log(`WebSocket closed: code ${event.code}, reason: ${event.reason}`);

  // Genesys Cloud specific close codes
  const TOKEN_EXPIRED_CODES = [4001, 4003, 1008];
  const ABNORMAL_CODES = [1006, 1012];

  if (TOKEN_EXPIRED_CODES.includes(event.code)) {
    console.warn('Token expiration detected. Initiating refresh sequence.');
    onTokenExpired();
  } else if (ABNORMAL_CODES.includes(event.code)) {
    console.warn('Abnormal closure detected. Scheduling reconnect.');
    onUnexpectedClose(event.code, event.reason);
  } else {
    console.info('Normal WebSocket closure.');
  }
};

The SDK does not automatically reconnect on token expiration because the refresh operation requires a synchronous token exchange before a new handshake can occur. Intercepting the close event allows your application to pause reconnection attempts, refresh the token, and establish a clean session without race conditions.

Step 3: Refresh the Token and Safely Reconnect

Token refresh requires a valid refresh token stored in the OAuth2Client. The SDK exposes platformClient.OAuth2Client.refreshToken() which performs the OAuth2 token exchange endpoint call (/oauth2/token). You must wrap this call in retry logic to handle transient 429 rate limits or 5xx server errors. After a successful refresh, you recreate the WebSocket instance and restore subscriptions.

import * as platformClient from '@genesyscloud/purecloud-platform-client-v2';

const MAX_RETRY_ATTEMPTS = 3;
const RETRY_DELAY_MS = 1000;

export const refreshTokenAndReconnect = async (
  onReconnect: (ws: WebSocket) => void
): Promise<void> => {
  let attempts = 0;

  while (attempts < MAX_RETRY_ATTEMPTS) {
    try {
      attempts++;
      console.log(`Token refresh attempt ${attempts}/${MAX_RETRY_ATTEMPTS}`);

      // Trigger OAuth2 refresh token exchange
      await platformClient.OAuth2Client.refreshToken();

      // Verify the new token is valid
      const newToken = await platformClient.OAuth2Client.getAccessToken();
      if (!newToken) {
        throw new Error('Refresh returned null token');
      }

      console.log('Token refresh successful. Reconnecting WebSocket.');

      // Recreate the WebSocket with the new token
      const newWs = await platformClient.WebSocketApi.createWebSocket();
      onReconnect(newWs);
      return;
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
      console.error(`Refresh attempt ${attempts} failed:`, errorMessage);

      if (attempts === MAX_RETRY_ATTEMPTS) {
        console.error('Max retry attempts reached. Manual reauthentication required.');
        throw new Error('Token refresh exhausted. Redirect to login.');
      }

      // Exponential backoff before next attempt
      await new Promise(resolve => setTimeout(resolve, RETRY_DELAY_MS * Math.pow(2, attempts - 1)));
    }
  }
};

The refresh endpoint requires the offline_access scope during initial authorization. Without it, the token response will not include a refresh token, and subsequent calls to refreshToken() will throw an OAuth2Error. The exponential backoff prevents cascading 429 responses when multiple agent desktop tabs attempt refresh simultaneously.

Complete Working Example

The following React component integrates authentication setup, WebSocket lifecycle management, close event interception, and token refresh into a single production-ready module. It uses React hooks to manage connection state and cleanup resources on unmount.

import React, { useEffect, useRef, useState } from 'react';
import * as platformClient from '@genesyscloud/purecloud-platform-client-v2';
import { initializeGenesysSdk } from './config/genesys-sdk';
import { createAgentWebSocket } from './ws-connection';
import { handleWebSocketClose } from './ws-close-handler';
import { refreshTokenAndReconnect } from './ws-token-refresh';

interface AgentWebSocketProps {
  clientId: string;
  clientSecret: string;
  refreshToken: string;
  environment: 'mypurecloud.com' | 'euw2.pure.cloud' | 'usw2.pure.cloud';
}

export const AgentWebSocketConnection: React.FC<AgentWebSocketProps> = ({
  clientId,
  clientSecret,
  refreshToken,
  environment
}) => {
  const [connectionStatus, setConnectionStatus] = useState<'connecting' | 'connected' | 'disconnected' | 'error'>('connecting');
  const wsRef = useRef<WebSocket | null>(null);
  const initializedRef = useRef(false);

  useEffect(() => {
    let mounted = true;

    const setupConnection = async () => {
      try {
        if (!initializedRef.current) {
          initializeGenesysSdk(clientId, clientSecret, refreshToken, environment);
          initializedRef.current = true;
        }

        if (mounted) setConnectionStatus('connecting');

        const ws = await createAgentWebSocket();
        wsRef.current = ws;

        if (mounted) setConnectionStatus('connected');

        ws.onclose = (event: CloseEvent) => {
          if (!mounted) return;
          setConnectionStatus('disconnected');

          handleWebSocketClose(
            event,
            async () => {
              await refreshTokenAndReconnect((newWs) => {
                wsRef.current = newWs;
                setConnectionStatus('connected');
              });
            },
            (code, reason) => {
              console.warn(`Unexpected close: ${code} - ${reason}`);
            }
          );
        };

        ws.onerror = (error: Event) => {
          if (!mounted) return;
          setConnectionStatus('error');
          console.error('WebSocket error:', error);
        };
      } catch (error) {
        if (!mounted) return;
        setConnectionStatus('error');
        console.error('WebSocket initialization failed:', error);
      }
    };

    setupConnection();

    return () => {
      mounted = false;
      if (wsRef.current && wsRef.current.readyState === WebSocket.OPEN) {
        wsRef.current.close(1000, 'Component unmount');
      }
    };
  }, [clientId, clientSecret, refreshToken, environment]);

  return (
    <div data-testid="agent-ws-status">
      <span>Status: {connectionStatus}</span>
    </div>
  );
};

This component initializes the SDK once, establishes the WebSocket, attaches lifecycle handlers, and delegates close event processing to the modular functions defined earlier. The mounted flag prevents state updates after unmount, which eliminates React warning errors during asynchronous refresh operations.

Common Errors & Debugging

Error: 401 Unauthorized during WebSocket handshake

• Cause: The access token is expired, missing required scopes, or the OAuth2Client was not initialized with a valid refresh token.
• Fix: Verify that the initial authorization request included offline_access and the required agent scopes. Call platformClient.OAuth2Client.getAccessToken() before createWebSocket() to confirm token validity. If the token is null, redirect the user to the Genesys Cloud authorization endpoint.
• Code showing the fix:

const token = await platformClient.OAuth2Client.getAccessToken();
if (!token) {
  window.location.href = `https://${environment}/oauth/authorize?client_id=${clientId}&response_type=code&scope=agent:login+presence:read+routing:queue:read+offline_access&redirect_uri=${encodeURIComponent(redirectUri)}`;
  return;
}

Error: 1008 Policy Violation on close

• Cause: The WebSocket connection lacks required OAuth scopes for the subscribed channels. Genesys Cloud enforces scope validation at the WebSocket level.
• Fix: Add presence:read, routing:queue:read, and webchat:widget to your authorization scope string. Regenerate the refresh token after scope expansion.
• Code showing the fix:

// Ensure scopes are requested during initial PKCE or client credentials flow
const requiredScopes = ['agent:login', 'presence:read', 'routing:queue:read', 'webchat:widget', 'offline_access'];

Error: 429 Too Many Requests during token refresh

• Cause: Multiple browser tabs or concurrent React components trigger simultaneous refresh calls, exceeding the /oauth2/token rate limit.
• Fix: Implement a global refresh lock or queue refresh requests. The exponential backoff in refreshTokenAndReconnect mitigates this, but you can add a module-level mutex for stricter control.
• Code showing the fix:

let isRefreshing = false;
let pendingRefreshes: (() => void)[] = [];

const refreshToken = async () => {
  if (isRefreshing) {
    return new Promise<void>(resolve => pendingRefreshes.push(() => resolve()));
  }
  isRefreshing = true;
  try {
    await platformClient.OAuth2Client.refreshToken();
  } finally {
    isRefreshing = false;
    pendingRefreshes.forEach(resolve => resolve());
    pendingRefreshes = [];
  }
};

Error: WebSocket readyState 3 (CLOSED) immediately after creation

• Cause: The SDK was initialized with an invalid base URL or the environment parameter does not match the OAuth token issuer.
• Fix: Match the environment value exactly to the token issuer domain. Use mypurecloud.com for standard US regions, euw2.pure.cloud for EU, or usw2.pure.cloud for US West. Verify the baseUrl in platformClient.init() matches the token’s iss claim.

Official References

• Genesys Cloud WebSocket API Documentation
• JavaScript Client SDK Reference
• OAuth2 Token Exchange Endpoint
• WebSocket Close Codes Specification