customize token endpoint handler

src/Auth0Client.ts

@@ -76,7 +76,8 @@ import {
   User,
   IdToken,
   GetTokenSilentlyVerboseResponse,
-  TokenEndpointResponse
+  TokenEndpointResponse,
+  TokenEndpointOptions
 } from './global';
 
 // @ts-ignore
@@ -123,6 +124,7 @@ export class Auth0Client {
   private readonly isAuthenticatedCookieName: string;
   private readonly nowProvider: () => number | Promise<number>;
   private readonly httpTimeoutMs: number;
+  private readonly tokenEndpointHandler: (options: TokenEndpointOptions, worker?: Worker) => Promise<TokenEndpointResponse>;
   private readonly options: Auth0ClientOptions & {
     authorizationParams: AuthorizationParams;
   };
@@ -213,6 +215,8 @@ export class Auth0Client {
 
     this.nowProvider = this.options.nowProvider || DEFAULT_NOW_PROVIDER;
 
+    this.tokenEndpointHandler = this.options.tokenEndpointHandler || oauthToken;
+
     this.cacheManager = new CacheManager(
       cache,
       !cache.allKeys
@@ -1101,7 +1105,7 @@ export class Auth0Client {
     additionalParameters?: RequestTokenAdditionalParameters
   ) {
     const { nonceIn, organization } = additionalParameters || {};
-    const authResult = await oauthToken(
+    const authResult = await this.tokenEndpointHandler(
       {
         baseUrl: this.domainUrl,
         client_id: this.options.clientId,

src/global.ts

@@ -269,6 +269,13 @@ export interface Auth0ClientOptions extends BaseLoginOptions {
    * **Note**: The worker is only used when `useRefreshTokens: true`, `cacheLocation: 'memory'`, and the `cache` is not custom.
    */
   workerUrl?: string;
+
+  /**
+   * If provided, the SDK will use this method to communicate with token endpoint.
+   * @param options
+   * @param worker
+   */
+  tokenEndpointHandler?: (options: TokenEndpointOptions, worker?: Worker) => Promise<TokenEndpointResponse>;
 }
 
 /**

src/index.ts

@@ -22,6 +22,8 @@ export async function createAuth0Client(options: Auth0ClientOptions) {
 
 export { Auth0Client };
 
+export { getJSON } from './http';
+
 export {
   GenericError,
   AuthenticationError,