// Prepare the login request details
var url = paramsValues.get("url");
var clientId = paramsValues.get("clientId");
var clientSecret = paramsValues.get("clientSecret");
print("Logging in to url: " + url + " clientId: " + clientId);
print("logging in to client secret: " + clientSecret);

var username = credentials.getParam("username");
var password = credentials.getParam("password");

var requestUri = new URI(url, false);
var requestMethod = HttpRequestHeader.POST;

// Build the request body using the credentials values
// This auth is based on the grand type "password" to retrieve fresh tokens
// https://developer.okta.com/blog/2018/06/29/what-is-the-oauth2-password-grant

var params = [];
params.push(new HtmlParameter(HtmlParameter.Type.form, 'grant_type', 'password'));
params.push(new HtmlParameter(HtmlParameter.Type.form, 'username', username));
params.push(new HtmlParameter(HtmlParameter.Type.form, 'password', password));

params.push(new HtmlParameter(HtmlParameter.Type.form, 'client_secret', clientSecret));
params.push(new HtmlParameter(HtmlParameter.Type.form, 'client_id', clientId));


var requestBody = params.map(function(param) {
    return encodeURIComponent(param.getName()) + '=' + encodeURIComponent(param.getValue());
}).join('&');

// Build the actual message to be sent
print("Sending " + requestMethod + " request to " + requestUri + " with body: " + requestBody);
var msg = helper.prepareMessage();
msg.setRequestBody(requestBody);

var requestHeader = new HttpRequestHeader(requestMethod, requestUri, HttpHeader.HTTP10);
msg.setRequestHeader(requestHeader);
print("Msg prepared")

// Send the authentication message and return it
try {
    helper.sendAndReceive(msg);
    print("Received response status code for authentication request: " + msg.getResponseHeader().getStatusCode());
    return msg;
} catch (err) {
    print("**********************   Got error");
    print(err);
}

return null