![]() When the popup finishes redirecting to the application after authentication, code in the redirect handler will store the code, and tokens in local storage for the application to use. If the user experience (UX) of a full page redirect doesn't work for the application, consider using a popup to handle authentication. Consider having a pre-load sequence in the app that checks for a login session and redirects to the login page before the app fully unpacks and executes the JavaScript payload.Follow best practices for caching of SPAs so that the app isn't downloaded in-full twice. The redirect does result in the SPA being loaded twice.The user's browser will visit the login page, present the cookies containing the user session, and then redirect back to the application with the code and tokens in a fragment. On the first load of the SPA, redirect the user to the sign-in page if no session already exists (or if the session is expired).There are two ways of accomplishing sign-in: Because prompt=none in an iframe is no longer an option when third-party cookies are blocked, applications must visit the login page in a top-level frame to have an authorization code issued. This pattern meant applications didn't need a full page redirect to sign the user in, improving performance and user experience - the user visits the web page and is signed in already. ![]() In most browsers, this request will respond with tokens for the currently signed-in user (assuming consent has already been granted). Some applications using the implicit flow attempt sign-in without redirecting by opening a login iframe using prompt=none. Refresh tokens issued through the authorization code flow to spa redirect URIs have a 24-hour lifetime rather than a 90-day lifetime.The redirect URI must be marked as type spa to enable CORS on login endpoints.PKCE is recommended for native and confidential clients. PKCE is required for SPAs on the Microsoft identity platform.Microsoft Authentication Library (MSAL) for JavaScript v2.0, implements the authorization code flow for SPAs and, with minor updates, is a drop-in replacement for MSAL.js 1.x.įor the Microsoft identity platform, SPAs and native clients follow similar protocol guidance: ![]() When the app requires new tokens, it can use the refresh token flow to get new tokens. In the auth code flow, the identity provider issues a code, and the SPA redeems the code for an access token and a refresh token. To continue authenticating users in SPAs, app developers must use the authorization code flow. The solution outlined in this article works in all of these browsers, or anywhere third-party cookies are blocked. ![]() Brave blocks third-party cookies by default, and Chromium (the platform behind Google Chrome and Microsoft Edge) has announced that they as well will stop supporting third-party cookies in the future. Safari isn't alone in blocking third-party cookies to enhance user privacy. When a browser blocks third-party cookies to prevent user tracking, SPAs are also broken. Unfortunately, this pattern is also the standard way of implementing the implicit flow in single-page apps (SPAs). ITP blocks "third-party" cookies, cookies on requests that cross domains.Ī common form of user tracking is done by loading an iframe to third-party site in the background and using cookies to correlate the user across the Internet. What is Intelligent Tracking Protection (ITP)?Īpple Safari has an on-by-default privacy protection feature called Intelligent Tracking Protection, or ITP. In the Microsoft identity platform, we use the authorization flow with Proof Key for Code Exchange (PKCE) and refresh tokens to keep users signed in when third-party cookies are blocked. ![]() This block breaks the implicit flow and requires new authentication patterns to successfully sign in users. Many browsers block third-party cookies, cookies on requests to domains other than the domain shown in the browser's address bar. ![]()
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