Provide a way for developers to override the navigation methods used

change/@azure-msal-browser-58ddbcda-5d34-4249-acbd-c5e52b1d8144.json

@@ -0,0 +1,7 @@
+{
+  "type": "minor",
+  "comment": "Add setNavigationClient API and expose INavigationClient interface (#2985)",
+  "packageName": "@azure/msal-browser",
+  "email": "thomas.norling@microsoft.com",
+  "dependentChangeType": "patch"
+}

change/@azure-msal-react-eaed0b7f-bbb9-4ea1-97bf-f4a9041c0c78.json

@@ -0,0 +1,7 @@
+{
+  "type": "none",
+  "comment": "Docs Updates (#2985)",
+  "packageName": "@azure/msal-react",
+  "email": "thomas.norling@microsoft.com",
+  "dependentChangeType": "none"
+}

lib/msal-browser/docs/navigation.md

@@ -0,0 +1,94 @@
+# Intercepting or Overriding Window Navigation
+
+By default `msal-browser` uses `window.location.assign` and `window.location.replace` to redirect your application to external urls, such as the sign-in or sign-out pages, and internal urls, other pages in your app after returning from an external redirect. There may be situations, however, where you would like to override the default behavior with your own. For example, frameworks like React and Angular provide different APIs to handle client-side navigation without reloading the entire SPA. `msal-browser` exposes both the `INavigationClient` interface as well as the `NavigationClient` default implementation for you to provide your own custom implementation.
+
+## Writing your own implemenation
+
+The interface contains 2 methods:
+
+- `navigateInternal` - Called when redirecting between pages in your app e.g. redirecting from the `redirectUri` back to the page that initiated the login
+- `navigateExternal` - Called when redirecting to urls external to your app e.g. AAD Sign-in prompt
+
+You can choose to provide custom implementations of both by implementing `INavigationClient`:
+
+```javascript
+class CustomNavigationClient implements INavigationClient {
+    async navigateInternal(url, options) {
+        // Your custom logic
+    }
+
+    async navigateExternal(url, options) {
+        // Your custom logic
+    }
+}
+```
+
+Alternatively, if you just need to override one method you can extend the default `NavigationClient`:
+
+```javascript
+class CustomNavigationClient extends NavigationClient {
+    async navigateInternal(url, options) {
+        // Your custom logic
+    }
+
+    // navigateExternal will use the default
+}
+```
+
+**Note:** When providing your own implementation of `navigateInternal` you should not navigate to a different domain as this can break your authentication flow. It is intended only to be used for navigation to pages on the same domain.
+
+### Function Parameters
+
+- `url`: The URL MSAL.js would like to navigate to. This will be an absolute url. If you need a relative url it is your responsibility to parse this out.
+- `options`: Will contain additional information about the navigation you may find useful such as; the ApiId of the function attempting to invoke navigation, a suggested timeout value and whether or not this navigation should be added to your browser history. You do not need to use any of these values but they are provided for your convenience.
+
+### Return Values
+
+Both functions are async and should return a promise that resolves to boolean `true`/`false`. In most cases you should return `true`.
+
+Return `true` if:
+
+- The function will cause the page to fully redirect to another page, such as going to the AAD sign-in page or reassigning the window object
+- The function will directly or indirectly cause `PublicClientApplication` to reinitialize or `handleRedirectPromise` to run again
+
+Return `false` if:
+
+- The function will not cause the page to redirect or reload, for example when extracting the url and navigating to it in a different window
+- The function will invoke client-side navigation to re-render a part of the page that does not reinitialize `PublicClientApplication` or call `handleRedirectPromise` again
+
+## Providing your custom implementation to `PublicClientApplication`
+
+Once you have written your custom class you provide an instance of it on the config you pass to `PublicClientApplication`:
+
+```javascript
+const navigationClient = new CustomNavigationClient();
+
+const config: Configuration = {
+    auth: {
+        clientId: "your-client-id"
+    },
+    system: {
+        navigationClient: navigationClient
+    }
+};
+
+const msalInstance = new PublicClientApplication(config);
+```
+
+In some cases, like in React or Angular, you may need to provide your custom class after initialization. You can do this by calling the `setNavigationClient` API:
+
+```javascript
+const config: Configuration = {
+    auth: {
+        clientId: "your-client-id"
+    }
+};
+
+const msalInstance = new PublicClientApplication(config);
+const navigationClient = new CustomNavigationClient();
+msalInstance.setNavigationClient(navigationClient);
+```
+
+## Examples
+
+If you'd like to see end to end examples of providing a custom `NavigationClient` check out our [react samples](https://github.com/AzureAD/microsoft-authentication-library-for-js/tree/dev/samples/msal-react-samples).

lib/msal-browser/src/app/ClientApplication.ts

@@ -23,6 +23,8 @@ import { EventError, EventMessage, EventPayload, EventCallbackFunction } from ".
 import { EventType } from "../event/EventType";
 import { EndSessionRequest } from "../request/EndSessionRequest";
 import { BrowserConfigurationAuthError } from "../error/BrowserConfigurationAuthError";
+import { INavigationClient } from "../navigation/INavigationClient";
+import { NavigationOptions } from "../navigation/NavigationOptions";
 
 export abstract class ClientApplication {
 
@@ -35,6 +37,9 @@ export abstract class ClientApplication {
     // Network interface implementation
     protected readonly networkClient: INetworkModule;
 
+    // Navigation interface implementation
+    protected navigationClient: INavigationClient;
+
     // Input configuration by developer/user
     protected config: BrowserConfiguration;
 
@@ -99,6 +104,9 @@ export abstract class ClientApplication {
         // Initialize the network module class.
         this.networkClient = this.config.system.networkClient;
 
+        // Initialize the navigation client class.
+        this.navigationClient = this.config.system.navigationClient;
+
         // Initialize redirectResponse Map
         this.redirectResponse = new Map();
 
@@ -233,17 +241,33 @@ export abstract class ClientApplication {
              * Cache the hash to be retrieved after the next redirect
              */
             this.browserStorage.setTemporaryCache(TemporaryCacheKeys.URL_HASH, responseHash, true);
+            const navigationOptions: NavigationOptions = {
+                apiId: ApiId.handleRedirectPromise,
+                timeout: this.config.system.redirectNavigationTimeout,
+                noHistory: true
+            };
+
+            /**
+             * Default behavior is to redirect to the start page and not process the hash now. 
+             * The start page is expected to also call handleRedirectPromise which will process the hash in one of the checks above.
+             */  
+            let processHashOnRedirect: boolean = true;
             if (!loginRequestUrl || loginRequestUrl === "null") {
                 // Redirect to home page if login request url is null (real null or the string null)
                 const homepage = BrowserUtils.getHomepage();
                 // Cache the homepage under ORIGIN_URI to ensure cached hash is processed on homepage
                 this.browserStorage.setTemporaryCache(TemporaryCacheKeys.ORIGIN_URI, homepage, true);
                 this.logger.warning("Unable to get valid login request url from cache, redirecting to home page");
-                await BrowserUtils.navigateWindow(homepage, this.config.system.redirectNavigationTimeout, this.logger, true);
+                processHashOnRedirect = await this.navigationClient.navigateInternal(homepage, navigationOptions);
             } else {
                 // Navigate to page that initiated the redirect request
                 this.logger.verbose(`Navigating to loginRequestUrl: ${loginRequestUrl}`);
-                await BrowserUtils.navigateWindow(loginRequestUrl, this.config.system.redirectNavigationTimeout, this.logger, true);
+                processHashOnRedirect = await this.navigationClient.navigateInternal(loginRequestUrl, navigationOptions);
+            }
+
+            // If navigateInternal implementation returns false, handle the hash now
+            if (!processHashOnRedirect) {
+                return this.handleHash(responseHash, state);
             }
         }
 
@@ -365,6 +389,7 @@ export abstract class ClientApplication {
 
             // Show the UI once the url has been created. Response will come back in the hash, which will be handled in the handleRedirectCallback function.
             return interactionHandler.initiateAuthRequest(navigateUrl, {
+                navigationClient: this.navigationClient,
                 redirectTimeout: this.config.system.redirectNavigationTimeout,
                 redirectStartPage: redirectStartPage,
                 onRedirectNavigate: request.onRedirectNavigate
@@ -651,18 +676,26 @@ export abstract class ClientApplication {
                 this.setActiveAccount(null);
             }
 
+            const navigationOptions: NavigationOptions = {
+                apiId: ApiId.logout,
+                timeout: this.config.system.redirectNavigationTimeout,
+                noHistory: false
+            };
+
             // Check if onRedirectNavigate is implemented, and invoke it if so
             if (logoutRequest && typeof logoutRequest.onRedirectNavigate === "function") {
                 const navigate = logoutRequest.onRedirectNavigate(logoutUri);
 
                 if (navigate !== false) {
                     this.logger.verbose("Logout onRedirectNavigate did not return false, navigating");
-                    return BrowserUtils.navigateWindow(logoutUri, this.config.system.redirectNavigationTimeout, this.logger);
+                    await this.navigationClient.navigateExternal(logoutUri, navigationOptions);
+                    return;
                 } else {
                     this.logger.verbose("Logout onRedirectNavigate returned false, stopping navigation");
                 }
             } else {
-                return BrowserUtils.navigateWindow(logoutUri, this.config.system.redirectNavigationTimeout, this.logger);
+                await this.navigationClient.navigateExternal(logoutUri, navigationOptions);
+                return;
             }
         } catch(e) {
             serverTelemetryManager.cacheFailedRequest(e);
@@ -1166,5 +1199,13 @@ export abstract class ClientApplication {
         this.wrapperSKU = sku;
         this.wrapperVer = version;
     }
+
+    /**
+     * Sets navigation client
+     * @param navigationClient
+     */
+    setNavigationClient(navigationClient: INavigationClient): void {
+        this.navigationClient = navigationClient;
+    }
     // #endregion
 }

lib/msal-browser/src/app/IPublicClientApplication.ts

@@ -11,6 +11,7 @@ import { SsoSilentRequest } from "../request/SsoSilentRequest";
 import { EndSessionRequest } from "../request/EndSessionRequest";
 import { BrowserConfigurationAuthError } from "../error/BrowserConfigurationAuthError";
 import { WrapperSKU } from "../utils/BrowserConstants";
+import { INavigationClient } from "../navigation/INavigationClient";
 
 export interface IPublicClientApplication {
     acquireTokenPopup(request: PopupRequest): Promise<AuthenticationResult>;
@@ -32,6 +33,7 @@ export interface IPublicClientApplication {
     setActiveAccount(account: AccountInfo | null): void;
     getActiveAccount(): AccountInfo | null;
     initializeWrapperLibrary(sku: WrapperSKU, version: string): void;
+    setNavigationClient(navigationClient: INavigationClient): void;
 }
 
 export const stubbedPublicClientApplication: IPublicClientApplication = {
@@ -91,5 +93,8 @@ export const stubbedPublicClientApplication: IPublicClientApplication = {
     },
     initializeWrapperLibrary: () => {
         return;
+    },
+    setNavigationClient: () => {
+        return;
     }
 };

lib/msal-browser/src/config/Configuration.ts

@@ -6,6 +6,8 @@
 import { SystemOptions, LoggerOptions, INetworkModule, DEFAULT_SYSTEM_OPTIONS, Constants, ProtocolMode, LogLevel, StubbedNetworkModule } from "@azure/msal-common";
 import { BrowserUtils } from "../utils/BrowserUtils";
 import { BrowserCacheLocation } from "../utils/BrowserConstants";
+import { INavigationClient } from "../navigation/INavigationClient";
+import { NavigationClient } from "../navigation/NavigationClient";
 
 // Default timeout for popup windows and iframes in milliseconds
 export const DEFAULT_POPUP_TIMEOUT_MS = 60000;
@@ -68,6 +70,7 @@ export type CacheOptions = {
 export type BrowserSystemOptions = SystemOptions & {
     loggerOptions?: LoggerOptions;
     networkClient?: INetworkModule;
+    navigationClient?: INavigationClient;
     windowHashTimeout?: number;
     iframeHashTimeout?: number;
     loadFrameTimeout?: number;
@@ -141,6 +144,7 @@ export function buildConfiguration({ auth: userInputAuth, cache: userInputCache,
         ...DEFAULT_SYSTEM_OPTIONS,
         loggerOptions: DEFAULT_LOGGER_OPTIONS,
         networkClient: isBrowserEnvironment ? BrowserUtils.getBrowserNetworkClient() : StubbedNetworkModule,
+        navigationClient: new NavigationClient(),
         loadFrameTimeout: 0,
         // If loadFrameTimeout is provided, use that as default.
         windowHashTimeout: (userInputSystem && userInputSystem.loadFrameTimeout) || DEFAULT_POPUP_TIMEOUT_MS,

lib/msal-browser/src/index.ts

@@ -10,7 +10,7 @@
 
 export { PublicClientApplication } from "./app/PublicClientApplication";
 export { Configuration, BrowserAuthOptions, CacheOptions, BrowserSystemOptions } from "./config/Configuration";
-export { InteractionType, InteractionStatus, BrowserCacheLocation, WrapperSKU } from "./utils/BrowserConstants";
+export { InteractionType, InteractionStatus, BrowserCacheLocation, WrapperSKU, ApiId } from "./utils/BrowserConstants";
 export { BrowserUtils } from "./utils/BrowserUtils";
 
 // Browser Errors
@@ -19,6 +19,9 @@ export { BrowserConfigurationAuthError, BrowserConfigurationAuthErrorMessage } f
 
 // Interfaces
 export { IPublicClientApplication, stubbedPublicClientApplication } from "./app/IPublicClientApplication";
+export { INavigationClient } from "./navigation/INavigationClient";
+export { NavigationClient } from "./navigation/NavigationClient";
+export { NavigationOptions } from "./navigation/NavigationOptions";
 export { PopupRequest } from "./request/PopupRequest";
 export { RedirectRequest } from "./request/RedirectRequest";
 export { SilentRequest } from "./request/SilentRequest";

lib/msal-browser/src/interaction_handler/RedirectHandler.ts

@@ -5,12 +5,14 @@
 
 import { AuthorizationCodeClient, StringUtils, CommonAuthorizationCodeRequest, ICrypto, AuthenticationResult, ThrottlingUtils, Authority, INetworkModule, ClientAuthError } from "@azure/msal-common";
 import { BrowserAuthError } from "../error/BrowserAuthError";
-import { BrowserConstants, TemporaryCacheKeys } from "../utils/BrowserConstants";
-import { BrowserUtils } from "../utils/BrowserUtils";
+import { ApiId, BrowserConstants, TemporaryCacheKeys } from "../utils/BrowserConstants";
 import { BrowserCacheManager } from "../cache/BrowserCacheManager";
 import { InteractionHandler, InteractionParams } from "./InteractionHandler";
+import { INavigationClient } from "../navigation/INavigationClient";
+import { NavigationOptions } from "../navigation/NavigationOptions";
 
 export type RedirectParams = InteractionParams & {
+    navigationClient: INavigationClient;
     redirectTimeout: number;
     redirectStartPage: string;
     onRedirectNavigate?: (url: string) => void | boolean;
@@ -29,7 +31,7 @@ export class RedirectHandler extends InteractionHandler {
      * Redirects window to given URL.
      * @param urlNavigate
      */
-    initiateAuthRequest(requestUrl: string, params: RedirectParams): Promise<void> {
+    async initiateAuthRequest(requestUrl: string, params: RedirectParams): Promise<void> {
         // Navigate if valid URL
         if (!StringUtils.isEmpty(requestUrl)) {
             // Cache start page, returns to this page after redirectUri if navigateToLoginRequestUrl is true
@@ -41,6 +43,12 @@ export class RedirectHandler extends InteractionHandler {
             this.browserStorage.setTemporaryCache(TemporaryCacheKeys.INTERACTION_STATUS_KEY, BrowserConstants.INTERACTION_IN_PROGRESS_VALUE, true);
             this.browserStorage.cacheCodeRequest(this.authCodeRequest, this.browserCrypto);
             this.authModule.logger.infoPii("Navigate to:" + requestUrl);
+            const navigationOptions: NavigationOptions = {
+                apiId: ApiId.acquireTokenRedirect,
+                timeout: params.redirectTimeout,
+                noHistory: false
+            };
+
             // If onRedirectNavigate is implemented, invoke it and provide requestUrl
             if (typeof params.onRedirectNavigate === "function") {
                 this.authModule.logger.verbose("Invoking onRedirectNavigate callback");
@@ -49,15 +57,17 @@ export class RedirectHandler extends InteractionHandler {
                 // Returning false from onRedirectNavigate will stop navigation
                 if (navigate !== false) {
                     this.authModule.logger.verbose("onRedirectNavigate did not return false, navigating");
-                    return BrowserUtils.navigateWindow(requestUrl, params.redirectTimeout, this.authModule.logger);
+                    await params.navigationClient.navigateExternal(requestUrl, navigationOptions);
+                    return;
                 } else {
                     this.authModule.logger.verbose("onRedirectNavigate returned false, stopping navigation");
-                    return Promise.resolve();
+                    return;
                 }
             } else {
                 // Navigate window to request URL
                 this.authModule.logger.verbose("Navigating window to navigate url");
-                return BrowserUtils.navigateWindow(requestUrl, params.redirectTimeout, this.authModule.logger);
+                await params.navigationClient.navigateExternal(requestUrl, navigationOptions);
+                return;
             }
         } else {
             // Throw error if request URL is empty.

lib/msal-browser/src/navigation/INavigationClient.ts

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License.
+ */
+
+import { NavigationOptions } from "./NavigationOptions";
+
+export interface INavigationClient {
+    /**
+     * Navigates to other pages within the same web application
+     * Return false if this doesn't cause the page to reload i.e. Client-side navigation
+     * @param url 
+     * @param options 
+     */
+    navigateInternal(url: string, options: NavigationOptions): Promise<boolean>;
+
+    /**
+     * Navigates to other pages outside the web application i.e. the Identity Provider
+     * @param url 
+     * @param options 
+     */
+    navigateExternal(url: string, options: NavigationOptions): Promise<boolean>;
+}