Class OAuth2Manager

Generic OAuth2 token manager supporting multiple grant types and automatic token refresh.

This class provides a standardized way to handle OAuth2 authentication flows including:

• Authorization code flow (with PKCE support)
• Client credentials flow
• Refresh token flow
• Direct access token usage

Features:

• Automatic token refresh before expiration
• Thread-safe token refresh (prevents concurrent refresh requests)
• Provider customization hooks for non-standard OAuth2 implementations
• Token persistence callbacks
• Support for multiple grant types

Example

// Initialize with client credentials
const oauth = new OAuth2Manager({
  clientId: 'your-client-id',
  clientSecret: 'your-client-secret',
  tokenEndpoint: 'https://api.example.com/oauth/token',
  authorizationEndpoint: 'https://api.example.com/oauth/authorize',
  scopes: ['read', 'write']
});

// Get a valid access token (auto-refreshes if needed)
const token = await oauth.getAccessToken();

// Use the token in API requests
const response = await fetch('https://api.example.com/data', {
  headers: { 'Authorization': `Bearer ${token}` }
});
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