azure - Using MSAL in React, how do you prevent a flash of unauthenticated content before logging out? - Stack Overflow

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My team is using @azure/msal-react to authenticate a user. When the user logs out, we call logoutRedirect():

import { useMsal } from '@azure/msal-react';

const { instance } = useMsal();

instance.logoutRedirect({
  postLogoutRedirectUri: '/'
});

When this runs, isAuthenticated becomes false immediately but there is a delay before the user is redirected to the Microsoft logout screen, causing a flash of our unauthenticated template.

import { useIsAuthenticated } from '@azure/msal-react';

const Layout = () => {
  const isAuthenticated = useIsAuthenticated();

  if(isAuthenticated) {
    return <>Authenticated Template</>;
  } else {
    // this flashes for a second before seeing the Microsoft account logout screen
    return <>Unauthenticated Template</>
  }
}

Is there a way to prevent this flash from occurring?

My team is using @azure/msal-react to authenticate a user. When the user logs out, we call logoutRedirect():

import { useMsal } from '@azure/msal-react';

const { instance } = useMsal();

instance.logoutRedirect({
  postLogoutRedirectUri: '/'
});

When this runs, isAuthenticated becomes false immediately but there is a delay before the user is redirected to the Microsoft logout screen, causing a flash of our unauthenticated template.

import { useIsAuthenticated } from '@azure/msal-react';

const Layout = () => {
  const isAuthenticated = useIsAuthenticated();

  if(isAuthenticated) {
    return <>Authenticated Template</>;
  } else {
    // this flashes for a second before seeing the Microsoft account logout screen
    return <>Unauthenticated Template</>
  }
}

Is there a way to prevent this flash from occurring?

• azure
• authentication
• azure-ad-msal
• msal-react

Share Follow asked Nov 19, 2024 at 18:16 Michael LynchMichael Lynch 3,15944 gold badges3939 silver badges7070 bronze badges 2

• You can use the logoutInProgress state to track the logout process. When instance.logoutRedirect() is called, it should be set to true to prevent displaying the unauthenticated content prematurely, showing a 'Logging out...' message instead. – Dasari Kamali Commented Nov 22, 2024 at 4:52
• You can try my GitHub Repository. – Dasari Kamali Commented Nov 22, 2024 at 4:52

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1 Answer 1

Sorted by: Reset to default 0

To prevent displaying unauthenticated content while the logout request is in progress, you can use the logoutInProgress state to track the process. Set it to true when instance.logoutRedirect() is called, showing a "Logging out..." message instead.

Here is the complete GitHub repository.

Layout.js :

import React, { useState, useEffect } from "react";
import { useMsal, useIsAuthenticated } from "@azure/msal-react";
import { msalInstance } from "../msalConfig";
import AuthenticatedTemplate from "./AuthenticatedTemplate";
import UnauthenticatedTemplate from "./UnauthenticatedTemplate";

function Layout() {
  const { instance } = useMsal();
  const isAuthenticated = useIsAuthenticated();
  const [logoutInProgress, setLogoutInProgress] = useState(false);
  const [error, setError] = useState(null);
  const [token, setToken] = useState(null);

  useEffect(() => {
    if (window.location.hash.includes("id_token")) {
      msalInstance.handleRedirectPromise()
        .then((response) => {
          if (response) {
            console.log("Login successful: ", response);
            setToken(response.accessToken); 
          }
        })
        .catch((error) => {
          console.error("Login error:", error);
          setError(`Login failed: ${error.message}`);
        });
    }
  }, []);

  useEffect(() => {
    if (logoutInProgress) {
      return <div>Logging out...</div>;
    }
  }, [logoutInProgress]);
  return isAuthenticated ? (
    <AuthenticatedTemplate handleLogout={handleLogout} token={token} />
  ) : (
    <UnauthenticatedTemplate handleLogin={handleLogin} error={error} />
  );

  function handleLogin() {
    msalInstance.loginRedirect({
      scopes: ["https://graph.microsoft/user.read"], 
      prompt: "select_account",
    }).catch((e) => {
      console.error("Login error:", e);
      setError(`Login failed: ${e.message}`);
    });
  }

  function handleLogout() {
    setLogoutInProgress(true);
    msalInstance.logoutRedirect({
      postLogoutRedirectUri: "/", 
    });
    const cookies = document.cookie.split("; ");
    cookies.forEach(cookie => {
      const cookieName = cookie.split("=")[0];
      document.cookie = `${cookieName}=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;`;
    });
  }
}
export default Layout;

msalConfig.js :

import * as msal from "@azure/msal-browser";

export const msalConfig = {
  auth: {
    clientId: "<clientID>",
    authority: "https://login.microsoftonline/<tenantID>", 
    redirectUri: "http://localhost:3000", 
  },
  system: {
    loggerOptions: {
      logLevel: msal.LogLevel.Verbose, 
      loggerCallback: (level, message, containsPii) => {
        if (containsPii) {
          console.log(`PII-Log: ${message}`);
        } else {
          console.log(`Log: ${message}`);
        }
      },
    },
  },
};
export const msalInstance = new msal.PublicClientApplication(msalConfig);

AuthenticatedTemplate.js :

import React from "react";

function AuthenticatedTemplate({ handleLogout }) {
  return (
    <div>
      <h1>Welcome! You are logged in.</h1>
      <button onClick={handleLogout}>Logout</button>
    </div>
  );
}
export default AuthenticatedTemplate;

Output :

The Reactjs application ran successfully, and the login page appeared as shown below:

I selected my account to log in, as below,

After successfully logging in, I was redirected to the Logout page, as shown below,

I logged out by clicking the Logout button and selected my account to log out without any issues, as shown below.

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