New MicrosoftTeams.authentication.getAuthToken is not a MS Graph Bearer: token? - microsoft-teams

Question

In the Single Sign-On for Teams
I have the call microsoftTeams.authentication.getAuthToken(authTokenRequest); working; that is, it successfully returns a token resolving to my Azure Active Directory (AAD) successfully. All good. Surprisingly easy. JWT returns with correct audience and scopes (as I have set in my tenant's AAD)
However what I get back when I decode the JWT this seems to just be an Authentication Token, not an Access Token.
Looking at the sample at Task Meow/teams.auth.service.js Does not seem to show how to swap the Auth for the Access Token.
I assume the code will look something like the method getToken() ... but since I have already spent 10+ working days on auth (old ADAL OH MY GOODNESS WAS THIS HORRIBLE) ...
Question:
I was wondering if there are any other good samples of MicrosoftTeams.js Authenticate / Auth Token / MSAL Access token out there?

Answer 1

Anyway, I did solve my problem by the following
Follow TaskMeow example through the abstractions ofauth.service.js > sso.auth.service.js > teams.auth.service.js
As I wanted additional AAD scopes (Files.ReadWrite.All to access the Sharepoint Online files in Teams and Groups.ReadWrite.All - to add Tabs) my getToken() method in teams.auth.service.js is something like the following:
getToken() {
if (!this.getTokenPromise) {
this.getTokenPromise = new Promise((resolve, reject) => {
this.ensureLoginHint().then(() => {
this.authContext.acquireToken(
'https://graph.microsoft.com',
(reason, token, error) => {
if (!error) {
resolve(token);
} else {
reject({ error, reason });
}
}
);
});
});
}
return this.getTokenPromise;
}
Editorial Comment:
Authentication in Microsoft Teams is too difficult
There seems to be many "approaches" in the documentation
The present "SSO" flow still has flaws, and is in "Developer Preview"
If you are an SPA developer it is just too difficult. I am (obviously) not an expert on Authentication -- so current "recipes" are imperative.
This is especially the case if you want more than the default "scopes" as described in Single Sign-on ... and most of the "good stuff" in Microsoft Graph is outside of these default scopes.

Answer 2

Also, this snippet may help.
If you follow the recommended Taskmeow in your Microsoft Teams app, you will get a quick appearance of the Redirect URI (aka /tab/silent-start)
To solve this, adal.js caches the user and access token.
So you can add a check in login()
login() {
if (!this.loginPromise) {
this.loginPromise = new Promise((resolve, reject) => {
this.ensureLoginHint().then(() => {
// Start the login flow
let cachedUser = this.authContext.getCachedUser();
let currentIdToken = this.authContext.getCachedToken(this.applicationConfig.clientId);
if (cachedUser && currentIdToken) {
resolve(this.getUser());
} else {
microsoftTeams.authentication.authenticate({
url: `${window.location.origin}/silent-start.html`,
width: 600,
height: 535,
successCallback: result => {
resolve(this.getUser());
},
failureCallback: reason => {
reject(reason);
}
});
}
});
});
}
return this.loginPromise;
}