Node.js - How to pass a value to another file-CodePudding

I have a project in which I use Express.js and activedirectory package for LDAP authentication.

I have a file called ad.js which includes-

exports.authUser = (username, password) => {
    ad.authenticate(username, password, function (err, auth) {
        if (err) {
            console.log('ERROR: '   JSON.stringify(err));
            return;
        }
        if (auth) {
            console.log('Authenticated!');
        } else {
            console.log('Authentication failed!');
        }
    })
}

I call authUser in app.js-

app.post("/login", (req, res) => {
  let username = req.body.username;
  let password = req.body.password;
  authUser(username, password);
})

The authentication works but I want to access the value of auth in app.js. What is the correct way to perform that?

Thanks for any advice.

CodePudding user response：

You can "promisify" your function and then await for the result. The main function returns a promise object and the route awaits for that promise to resolve.

exports.authUser = (username, password) => {
    return new Promise((resolve, reject) => {
        ad.authenticate(username, password, (err, auth) => {
            if (err) {
                console.log(`ERROR: ${JSON.stringify(err)}`);
                return reject(err);
            }
            console.log(auth ? 'Authenticated!' : 'Authentication failed!');
            return resolve(auth);
        });
    });
};

app.post("/login", async (req, res) => {
    const username = req.body.username;
    const password = req.body.password;
    try {
        const auth = await authUser(username, password);
    } catch (error) {
        // do something
    }
});