Lambda function that extract data from docusign xml and upload documents to the S3 bucket.

docusignWebhookHandler.js

'use strict';

var AWS = require('aws-sdk');

console.log('Loading function');

exports.handler =  (event, context, callback) => {
    var parseString = require('xml2js').parseString;
    //slice date from Date and Time object
    var today = new Date().toISOString().slice(0, 10);
    
      parseString(event.body,'utf8', function (err, result) {
          if(err) console.log(err);
          var json = JSON.stringify(result);
          let data = JSON.parse(json);
          
          //array of documents
          var pdfArray = data.DocuSignEnvelopeInformation.DocumentPDFs[0].DocumentPDF;
          var s3 = new AWS.S3();
          
          pdfArray.forEach(function(doc) {
            s3.putObject({
              Bucket: 'docusign-dev-bucket', //bucket name
              Key: (today+'/'+(doc.Name).toString()).split("_")[0]+'.pdf', // file name
              //document byte stream
              Body:  new Buffer((doc.PDFBytes).toString(), 'base64')
            }, function (err) {
              if (err) { 
                console.log(err);
                throw err; 
              }
              console.log('Successfully uploaded..');
            });
         });
      });
 
    callback(null, '');
};