Loopback 4 implementing Microsoft Graph API - microsoft-graph-api

Question

I am currently building a microservice that is responsible to communicate with Microsoft Graph, I have already made one with Loopback 3 and this was not a problem.
Except now, I am trying to do the same thing but with Loopback 4, but since the language changes from JavaScript to TypeScript I don't know if it's still possible to achieve this.
This was the code I used for Loopback 3 in my root server file:
'use strict';
const express = require('express');
const erouter = require('express').Router();
var session = require('express-session');
var passport = require('passport');
var OIDCStrategy = require('passport-azure-ad').OIDCStrategy;
const request = require('request');
var querystring = require('querystring');
const graph = require('./graph.service');
const getBookings = require('./getBookings.service');
const cors = require('cors');
var compression = require('compression');
module.exports = function(server) {
// Install a `/` route that returns server status
var router = server.loopback.Router();
router.get('/', server.loopback.status());
// Configure simple-oauth2
const oauth2 = require('simple-oauth2').create({
client: {
id: process.env.OAUTH_APP_ID,
secret: process.env.OAUTH_APP_PASSWORD
},
auth: {
tokenHost: process.env.OAUTH_AUTHORITY,
authorizePath: process.env.OAUTH_AUTHORIZE_ENDPOINT,
tokenPath: process.env.OAUTH_TOKEN_ENDPOINT
}
});
passport.serializeUser(function(user, done) {
var MSUser = server.models.MSUser;
var id = user.profile.oid;
MSUser.find({ where: { oid: id } }, function(err, msu) {
if (err) return done(err, null);
if (!msu) {
MSUser.create(user);
} else {
done(null, id);
}
});
});
passport.deserializeUser(function(id, done) {
var MSUser = server.models.MSUser;
MSUser.findById(id, function(err, user) {
if (err) return next(err);
done(null, user);
});
});
async function signInComplete(iss, sub, profile, accessToken, refreshToken, params, done) {
if (!profile.oid) {
return done(new Error("No OID found in user profile."), null);
}
try {
const user = await graph.getUserDetails(accessToken);
if (user) {
profile['email'] = user.mail ? user.mail.toLowerCase() : user.userPrincipalName.toLowerCase();
}
} catch (err) {
done(err, null);
}
let oauthToken = oauth2.accessToken.create(params);
var AuthUser = server.models.AuthUser;
var user = {};
AuthUser.find({ where: { email: profile['email'] } }, function(err, au) {
if (err) return done(err, null);
if (au.length != 1) return done(new Error("User was not found with that email address."), null);
user = au[0];
const dataMsAuth = querystring.stringify({
"created": new Date().toDateString(),
"token_type": oauthToken.token.token_type,
"expires_in": oauthToken.token.expires_in,
"access_token": oauthToken.token.access_token,
"scope": oauthToken.token.scope,
"ext_expires_in": oauthToken.token.ext_expires_in,
"refresh_token": oauthToken.token.refresh_token,
"id_token": oauthToken.token.id_token,
"expires_at": new Date(oauthToken.token.expires_at).toDateString()
});
const postMSAuth = {
url: process.env.API_URL + "api/Companies/" + user.companyId + "/msauth",
method: 'POST',
body: dataMsAuth,
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
}
}
request(postMSAuth, function(err, resp, body) {
if (err) return done(err, null);
var MSUser = server.models.MSUser;
var id = profile.oid;
var msuser = { profile, oauthToken, oid: id, email: profile.email }
MSUser.findById(id, function(err, msu) {
if (err) return done(err, null);
if (!msu) {
MSUser.create(msuser);
}
});
return done(null, msuser);
});
});
}
passport.use(new OIDCStrategy({
identityMetadata: `${process.env.OAUTH_AUTHORITY}${process.env.OAUTH_ID_METADATA}`,
clientID: process.env.OAUTH_APP_ID,
responseType: 'code id_token',
responseMode: 'form_post',
redirectUrl: process.env.OAUTH_REDIRECT_URI,
allowHttpForRedirectUrl: true,
clientSecret: process.env.OAUTH_APP_PASSWORD,
validateIssuer: false,
passReqToCallback: false,
scope: process.env.OAUTH_SCOPES.split(' ')
},
signInComplete
));
var app = express();
app.use(compression());
app.use(session({
secret: process.env.BOOKINGS_LOOPBACK_SECRET,
resave: false,
saveUninitialized: false,
unset: 'destroy'
}));
app.use("/result", express.static('client'));
app.use(passport.initialize());
app.use(passport.session());
app.use(cors({
origin: '*'
}));
erouter.get('/API/bookings/:companyid', getBookings());
erouter.get('/auth/signin',
function(req, res, next) {
passport.authenticate('azuread-openidconnect', {
response: res,
prompt: 'login',
state: req.query.state,
failureRedirect: process.env.WEBSITE_URL + 'settings?error=incorrect_request',
successRedirect: process.env.WEBSITE_URL + 'settings?auth=success'
})(req, res, next);
}
);
erouter.post('/auth/callback',
function(req, res, next) {
passport.authenticate('azuread-openidconnect', {
response: res,
failureRedirect: process.env.WEBSITE_URL + 'settings?error=permission_denied',
successRedirect: process.env.WEBSITE_URL + 'settings?auth=success'
})(req, res, next);
}
);
app.use(erouter);
server.use(app);
server.use(router);
};
So my question is: "Is it possible to implement Microsoft Graph API in TypeScript using Loopback 4 or should I keep using Loopback 3 In JavaScript?"
Thanks in advance,
Billy Cottrell