A suitelet that acts as a proxy for reCaptcha verification.

netsuite_recaptcha_suitelet.js

var CAPTCHA_VERIFICATION_URL = 'https://www.google.com/recaptcha/api/verify'; //This is the verification URL
var CAPTCHA_PRIVATE_KEY = '6Lf1-OASAAAAAFkwdm0fLSAPErgLRw54VzF4aPrO'; //This is the private key we've obtained from Part 1 of this tutorial

/**
 * 
 * @param {nlobjRequest} request Request object
 * @param {nlobjResponse} response Response object
 * @returns {Void} Any output is written via response object
 */

function main(request, response) {
   var jsonResponse = new JSONResponse();

   try {
      if (request.getMethod() == 'POST') {
         var clientIpAddress = request.getHeader('NS-Client-IP'); //Use this to get the IP Address of the client
         var captchaChallenge = request.getParameter('challenge'); //This parameter should be included on the request
         var captchaResponse = request.getParameter('response'); //This parameter should be included on the request

         /*
         * Build the post data.
         */
         var postData = {
            privatekey: CAPTCHA_PRIVATE_KEY,
            remoteip: clientIpAddress,
            challenge: captchaChallenge,
            response: captchaResponse
         };

         var captchaVerificationResponse = nlapiRequestURL(CAPTCHA_VERIFICATION_URL, postData); //Send the POST Request to Google for verification.

         /* 
         * Test the response. If the server does not respond with an HTTP 200 Status code, then it was not verified.
         * Google also returns true when the challenge and the user's response matches.
         */
         if (captchaVerificationResponse.getCode() != 200 || captchaVerificationResponse.getBody().indexOf('true') == -1) {
            jsonResponse.status.isSuccess = false;
            jsonResponse.status.errorMessage = 'Failed Verification';
         }
      }
   } catch (e) { //Catch any exception and fail the verification.
      jsonResponse.status.isSuccess = false;
      jsonResponse.status.errorMessage = 'An unexpected error has occurred. Error: ' + e.message;
   }

   response.setContentType('JSON'); //Sets the response Content Type to application/json
   response.write(JSON.stringify(jsonResponse)); //Serialize the JSONResponse object and return it.
}

/**
 * Encapsulate the JSON Response
 * @returns {JSONResponse} instance of JSONResponse object
 */
function JSONResponse() {
   this.status = {
      isSuccess: true,
      errorMessage: ''
   };
}