Lambda Function Code

'use strict';
const aws = require('aws-sdk');
const DynamoDB = new aws.DynamoDB.DocumentClient({region: 'us-west-2'});
const s3 = new aws.S3({ apiVersion: '2006-03-01' });
var m = require('./methods.js');


exports.handler = (event, context) => {
  // Get the object from the event and show its content type
    const bucket = event.Records[0].s3.bucket.name;
    const key = decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, ' '));
    const fileInfo = {
        Bucket: bucket,
        Key: key,
    };

    s3.getObject(fileInfo, (err, data) => {
        if (err) {
            console.log(err);
            const message = `Error getting object from bucket. Make sure they exist and your bucket is in the same region as this function.`;
            console.log(message);
        } else {
            var filesize = m.formatBytes(data.ContentLength);
            var params = {
                  Item: {
                   "FileName": {
                     S: key
                    },
                   "FileSize": {
                     S: filesize
                    },
                   "UploadedBy": {
                     S: data.Metadata.uploadedby
                    }
                  },
                  TableName: "FileMetaData"
                 };
            DynamoDB.putItem(params, function(err, data) {
                   if (err) console.log(err, err.stack); // an error occurred
                   else     console.log(data);           // successful response
            });

        }
    });