lambda-copy-test.js

'use strict';

const sinon = require('sinon'),
    assert = require('assert'),
    copyHandler = require('../index').handler;
    
describe('copy bucket handler', () => {

    const S3 = {
        copyObject: sinon.spy()
    };
    
    it('copies from XYZ to TARGET_BUCKET/__DATE__/XYZ', () => {
        const expectedParams = {
            CopySource: 'YOUR_EXPECTED_COPY_SOURCE',
            Bucket: 'YOUR_EXPECTED_COPY_BUCKET',
            Key: 'YOUR_EXPECTED_KEY' 
        };
        
        // Here is the trick, we are calling the copyHandler with a 4th argument, which is the spy
        copyHandler(event, null, console.log, S3);
        
        assert(S3.copyObject.calledWith(expectedParams));
    });
});
    

lambda-copy.js

'use strict';

const AWS = require('aws-sdk');
const defaultS3 = new AWS.S3({ apiVersion: '2006-03-01' });

exports.handler = (event, context, callback, S3 = defaultS3) => {
    const sourcekey = event.fillThisHereWithKeyPath;
    const sourceBucket = event.fillThisHereWithBucketPath; // get somewhere from your use case the source bucket / key names
    const dest = ''; // define the destination bucket
    
    S3.copyObject({
        CopySource: `${srcBucket}/${srcKey}`,
        Bucket: destinationBucket,
        Key: srcKey 
    }, (copyErr, copyData) => {
        if (copyErr) {
            throw `Error: ${copyErr}`;
        } else {
            console.log('Copied OK');
        } 
    });

    // Everything went fine, notify caller.
    callback(null, `Copy bucket from ${srcBucket} to ${destinationBucket} done.`);
};