Postman - Pre-Request script for handing tokens

postman-pre-script.js

// Refresh the token if necessary
let tokenDate = new Date(2010,1,1);
let tokenTimestamp = pm.collectionVariables.get('timestamp');
let userId = pm.collectionVariables.get('userid')
let token = pm.collectionVariables.get('token')
let expiresInTime = pm.collectionVariables.get('expires_in');


if(tokenTimestamp){
    tokenDate = Date.parse(tokenTimestamp);
}

if(!expiresInTime){
    expiresInTime = 1500000; // Set default expiration time to 15 minutes
}

now = Date.now();

let elapsed = (now - tokenDate) / 1000;

if(elapsed >= expiresInTime || token === null || token === undefined)
{
    let url = pm.environment.get('host')
    url += ':' + pm.environment.get('port')
    url += pm.environment.get('uri')
    pm.sendRequest({
        url:  url + '/auth/login',
        method: 'POST',
        header: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        },
        body: {
            mode: 'raw',
            raw: {
                'email': pm.environment.get('username'),
                'password': pm.environment.get('password'),
            }
        }
    }, function (err, res) {
        if (res.code === 200) {
            let response = res.json();
            pm.collectionVariables.set('token', response.access_token);
            pm.collectionVariables.set('timestamp', new Date());
            pm.collectionVariables.set('userid', response.id);

            pm.collectionVariables.set('expires_in', response.expires_in);

            console.log('Token set: ' + response.access_token);
        }
        else {
            console.log(res);
            throw new Error('Login failed with status: ' + res.status + ' (Code: ' + res.code + ')')
        }

    });
}