Migrate ADAL.js to MSAL.js - vue.js

Question

I have a SPA which uses the solution provided here to authenticate with Azure AD and everything works as expected. Now I want to migrate this to use MSAL.js.
I use below for login:
import * as MSAL from 'msal'
...
const config = {
auth: {
tenantId: '<mytenant>.com',
clientId: '<myclientid>',
redirectUri: <redirecturi>,
},
cache: {
cacheLocation: 'localStorage',
}
};
const tokenRequest = {
scopes: ["User.Read"]
};
export default {
userAgentApplication: null,
/**
* #return {Promise}
*/
initialize() {
let redirectUri = config.auth.redirectUri;
// create UserAgentApplication instance
this.userAgentApplication = new MSAL.UserAgentApplication(
config.auth.clientId,
'',
() => {
// callback for login redirect
},
{
redirectUri
}
);
// return promise
return new Promise((resolve, reject) => {
if (this.userAgentApplication.isCallback(window.location.hash) || window.self !== window.top) {
// redirect to the location specified in the url params.
}
else {
// try pull the user out of local storage
let user = this.userAgentApplication.getUser();
if (user) {
resolve();
}
else {
// no user at all - go sign in.
this.signIn();
}
}
});
},
signIn() {
this.userAgentApplication.loginRedirect(tokenRequest.scopes);
},
And then I use below to get the token:
getCachedToken() {
var token = this.userAgentApplication.acquireTokenSilent(tokenRequest.scopes);
return token;
}
isAuthenticated() {
// getCachedToken will only return a valid, non-expired token.
var user = this.userAgentApplication.getUser();
if (user) {
// get token
this.getCachedToken()
.then(token => {
axios.defaults.headers.common["Authorization"] = "Bearer " + token;
// get current user email
axios
.get('<azureapi-endpoint>' + '/GetCurrentUserEmail')
.then(response => { })
.catch(err => { })
.finally(() => {
});
})
.catch(err => { })
.finally(() => { });
return true;
}
else {
return false;
}
},
}
but after login I get below error:
Access to XMLHttpRequest at 'https://login.windows.net/common/oauth2/authorize?response_type=code+id_token&redirect_uri=<encoded-stuff>' (redirected from '<my-azure-api-endpoint>') from origin 'http://localhost:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Also the token that I get seems to be invalid as I get 401 errors trying to call api using the token. Upon checking the token against https://jwt.io/ I get an invalid signature.
I really appreciate anyone's input as I've already spent good few days and haven't got anywhere yet.

Answer 1

I'm not sure if this is your issue. however, for msal.js, in the config, there is no tenantId parameter, it's supposed to be authority. Here is a sample for graph api using msal.js
https://github.com/Azure-Samples/active-directory-javascript-graphapi-v2
specifically: the config is here: https://github.com/Azure-Samples/active-directory-javascript-graphapi-v2/blob/quickstart/JavaScriptSPA/authConfig.js
as per here, https://learn.microsoft.com/en-us/azure/active-directory/develop/msal-js-initializing-client-applications it is supposed to be hitting login.microsoftonline.com not login.windows.net