Generating Salesforce OAuth2 token via SSJS returning empty response

Question

I am trying to generate OAuth2 SF token via SSJS code on a CloudPage. I am not sure why I receive an empty response here. Following is my code

<script runat="server">

Platform.Load("core","1");

try {
  var instanceUrl = 'https://XXXXX--sandbox1.my.salesforce.com';
  var url = instanceUrl + '/services/oauth2/token'
  var payload = {
      grant_type: 'password',
      client_id: 'My Client ID',
      client_secret: 'My Client Secret',
      username: 'Username',
      password: 'Password'
    };
  var request = new Script.Util.HttpRequest(url);
  request.emptyContentHandling = 0;
  request.continueOnError = true;
  request.method = 'POST';
  request.setHeader('Content-Type','application/x-www-form-urlencoded');
  request.postData = Stringify(payload);      

  var response = request.send();
  Platform.Response.Write("</br> response: " + String(response.content));
  var resultJSON = Platform.Function.ParseJSON(String(response.content));
  Platform.Response.Write("</br> resultJSON: " + resultJSON);


} catch (ex) {
    Write("An error has occurred: " + Stringify(ex));
}

</script>

Following is the response printed when I click on Schedule/Publish:

response:
resultJSON: null

I use the same credentials via POSTMAN and I am able to generate the token successfully. So I am not sure why I receive an empty response here. Would great if someone can point me in the right direction.

ANSWER

Thanks to the following post: Getting Error while try to get Salesforce OAuth access token from SFMC cloudpages ssjs httppost?, I have tried the HTTPPost AMPScript function and it worked. Following is the modified code and it works:

<script runat="server">

    Platform.Load("core","1");

    try {  
      var clientId = 'MY_CLIENT_ID';
      var clientSecret = 'MY_CLIENT_SEC';
      var username = 'USERNAME';
      var password = 'PASSWORD'; 

      var payload = 'grant_type=password&client_id=';
      payload +=clientId;
      payload +='&client_secret=';
      payload +=clientSecret;
      payload +='&username=';
      payload +=username;
      payload +='&password=';
      payload +=password;

      Variable.SetValue('@payload', payload);

      Platform.Function.TreatAsContent('%%[ HTTPPost("https://pmisa--sandbox1.my.salesforce.com/services/oauth2/token", "application/x-www-form-urlencoded", @payload, @response) ]%%');

      var response = Variable.GetValue('@response');    
      response = Platform.Function.ParseJSON(response);
      Write("</br> access_token: " + (response['access_token']));

    } catch (e) {

      Write("<br>e: " + Stringify(e));

    }

</script>

Answer 1

3 things to note:

1) you do not need to load the platform core twice in one cloudpage.

2) You can use Write("test") instead of Platform.Response.Write("test")

3) use TreatAsContent to get rid of the extra script tags (watch out for wrapping or escaping quotes correctly!):

Variable.SetValue('@payload', payload);
Platform.Function.TreatAsContent("%%[ HTTPPost('https://XXXX--sandbox1.my.salesforce.com/services/oauth2/token','application/x-www-form-urlencoded', @payload, @response) ]%%");
var response = Variable.GetValue('@response');