Read s3 bucket object and upload to Xero as attachment example code

s3-xero-attachment-upload.js

// AWS s3
const aws = require('aws-sdk');
aws.config.loadFromPath('./aws.json');
aws.config.update({region:'us-east-1'});
const s3 = new aws.S3();

// Xero client
const xero = require('xero-node')
const fs = require('fs')
const config = require('./xero.json')

// Setup our Xero SDK (Private App Type)
if (config.privateKeyPath && !config.privateKey) 
	 config.privateKey = fs.readFileSync(config.privateKeyPath);

const xeroClient = new xero.PrivateApplication(config);

var data = {
    FileName: "test.pdf",
    MimeType: "application/pdf"
};

var attachmentObj = xeroClient.core.attachments.newAttachment(data);
var sampleInvoiceID = "514f4038-412c-4cc7-9d91-6f12a646bb1a";


let rStream = s3.getObject({Bucket: 'xero-invoices-api-node', Key: 'test.pdf'})
                .createReadStream()

console.log(rStream)

// Retrieve some entity to add the attachment to (e.g. Invoices)
xeroClient.core.invoices.getInvoice(sampleInvoiceID)
    .then(function(invoice){
    	console.log(invoice)
        attachmentObj.save("Invoices/" + invoice.InvoiceID, rStream, true)
          .then(function(attachments){
              //Attachment has been created
              var myAttachment = attachments.entities[0];

              console.log(myAttachment)
          })
    })