RESTMessageV2 in a MID Server Script Includes

[joesnow]

Hi all,

I'm in the process of creating a custom probe to identify my software using a Rest API call.

Let me know if the architecture of this seems correct or not.

• I've created a Discovery Probe (AppDiscovery)
• AppDiscovery creates an ECC Queue Item (Topic: JavascriptProbe, Name: AppProbe)

            with a couple parameters:

• user
• pass
• script.js / var test = new AppProbe(); test.run();
• AppProbe is a MID Server "Script Includes" (seen below):

var AppProbe= Class.create();
AppProbe.prototype = Object.extendsObject(AProbe, {
   initialize : function(probe) {
   this.probe = probe;
   },
   run : function() {
   var app_user = this.getParameter('user');
   var app_pass = this.getParameter('pass');
   ms.log('Attempting to log in with user: ' + this.getParameter('user'));
   var requestBody;
   var responseBody;
   var status;
   var sm;
   try{
             sm = new sn_ws.RESTMessageV2();
             sm.setEndpoint('https://mysoftware.com/authentication');
             sm.setRequestHeader("Content-Type", "application/json");   
             sm.setHttpMethod('post');   
             sm.setRequestBody('{"username":' + app_user + ',"password":' + app_pass + '}');
             response = sm.execute(); 
             responseBody = response.haveError() ? response.getErrorMessage() : response.getBody();
             status = response.getStatusCode();
   } catch(ex) {
             responseBody = ex.getMessage();
             status = '500';
   } finally {
             requestBody = sm ? sm.getRequestBody():null;
   }
   ms.log("Request Body: " + requestBody);
   ms.log("Response: " + responseBody);
   ms.log("HTTP Status: " + status);
},
   type: "AppProbe"
});

When I execute the AppDiscovery against my MID Server, these are my logs:

12/06/16 15:48:47 (636) Worker-Interactive:JavascriptProbe Worker starting: JavascriptProbe
12/06/16 15:48:47 (637) Worker-Interactive:JavascriptProbe *** Script: Attempting to log in with user: test
12/06/16 15:48:47 (769) Worker-Interactive:JavascriptProbe *** Script: Response: undefined
12/06/16 15:48:47 (769) Worker-Interactive:JavascriptProbe *** Script: Request Body: null
12/06/16 15:48:47 (769) Worker-Interactive:JavascriptProbe *** Script: Response: undefined
12/06/16 15:48:47 (769) Worker-Interactive:JavascriptProbe *** Script: HTTP Status: 500

Upon removing the try/catch, I get the source of the "nulls".

 "sn_ws" is not defined

I'm able to run this script without issue as a "Background script", but for some reason I can't run it as a MID Server Script Includes (which is where I think it should be run..)

Any advice or suggestions on how to execute a Rest call inside this script?

Thanks,

-Joe

[alexbin]

Hi All!

I have the same problem. Can anybody help me with this?

Regards,

[congthieu]

You don't need to create a custom probe. RESTMessageV2 runs on the instance and can make a REST call directly or via a MID server.

        http://wiki.servicenow.com/index.php?title=Scripting_Outbound_REST#gsc.tab=0

In a workflow you can put the code inside a run script activity.

Regards,

Cong

[alexbin]

Hi

Yes, you are right, it's possible to make REST call via MID server (http://wiki.servicenow.com/index.php?title=RESTMessageV2_API#setMIDServer.28String_midServer.29 ).

But I really need to do this in MID server script include for some reason.

I found the solution. Yes, RESTMessageV2 can't be used in the MID server script include, but we can use GlideHTTPCient instead.

var GetMethod = Packages.org.apache.commons.httpclient.methods.GetMethod;
var GlideHTTPCient = Packages.com.glide.communications.HTTPClient;
var httpClient = new GlideHTTPCient();


var getMethod = new GetMethod('https://...'); // put your endpoint URL here
getMethod.addRequestHeader('X-Auth-Token', '...'); // add request headers


var httpStatus = httpClient.executeMethod(getMethod);
var response = getMethod.getResponseBodyAsString();
getMethod.releaseConnection();

You can also see discovery MID server script include 'UCSRestXmlApiClient', it uses GlideHTTPClient and POST method.