Node upload base64 image data to AWS

AWS base64 image upload

var config = {
  "aws" : {
        "bucket": "...",
        "domain" : "...",
        "prefix" : "..",
        "path": "my/test/",
        "credentials" : {
            "accessKeyId": "...",
            "secretAccessKey": "..."
        }
    }
};

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

module.exports.storeImage = function(base64EncodedImage, config,  callback) {
    var buf = new Buffer(base64EncodedImage, 'base64');
    AWS.config = config.aws.credentials;
    var key = getUniqueFilename(config);
    var s3 = new AWS.S3();
    s3.putObject({
        Bucket: config.aws.bucket,
        Key: key,
        Body: buf,
        ACL: 'public-read',

        ContentType: "image/png",
        ContentEncoding: "base64"
    }, function(error, data) {
        callback(data, error, key);
    });
};

var getUniqueFilename = function(config) {
    var timestamp = (new Date()).getTime();
    var randomInteger = Math.floor((Math.random() * 1000000) + 1);

    return config.aws.path + timestamp + '_' + randomInteger + '.png';
};