fixed s3 validation bug

package.json

@@ -35,12 +35,12 @@
     "report-dir": "coverage"
   },
   "dependencies": {
-    "aws-sdk": "^2.192.0"
+    "aws-sdk": "^2.192.0",
+    "lodash": "^4.17.5"
   },
   "devDependencies": {
     "bunyan": "^1.8.12",
     "deepcopy": "^0.6.3",
-    "lodash": "^4.17.5",
     "mocha": "^4.1.0",
     "nyc": "^11.4.1",
     "pkginfo": "^0.4.1",

readme.md

@@ -1,7 +1,7 @@
 [![NPM Version][npm-image]][npm-url]
 [![Build Status][travis-image]][travis-url]
 [![Test Coverage][coveralls-image]][coveralls-url]
-<!--[![NPM Downloads][downloads-image]][downloads-url]-->
+[![NPM Downloads][downloads-image]][downloads-url]
 
 # aws-s3-multipart-copy
 
@@ -12,7 +12,7 @@ The module manages the copy parts order and bytes range according to the size of
 
 ** The package supports node 8 version and above.
 
-[![NPM](https://nodei.co/npm/aws-s3-multipart-copy.png?downloads=true&downloadRank=true&stars=true)][npm-stats]
+[![NPM](https://nodei.co/npm/aws-s3-multipart-copy.png)](https://nodei.co/npm/aws-s3-multipart-copy/)
 
 ## Installing
 
@@ -195,8 +195,8 @@ let options = {
 [npm-url]: https://npmjs.org/package/aws-s3-multipart-copy
 [travis-image]: https://api.travis-ci.org/LiadBerko/aws-s3-multipart-copy.svg?branch=master
 [travis-url]: https://travis-ci.org/LiadBerko/aws-s3-multipart-copy
-<!--[coveralls-image]: https://coveralls.io/repos/github/LiadBerko/aws-s3-multipart-copy/badge.svg?branch=master-->
-<!--[coveralls-url]: https://coveralls.io/repos/github/LiadBerko/aws-s3-multipart-copy/badge.svg?branch=master-->
+[coveralls-image]: https://coveralls.io/repos/github/LiadBerko/aws-s3-multipart-copy/badge.svg?branch=master
+[coveralls-url]: https://coveralls.io/repos/github/LiadBerko/aws-s3-multipart-copy/badge.svg?branch=master
 [downloads-image]: http://img.shields.io/npm/dm/aws-s3-multipart-copy.svg?style=flat
 [downloads-url]: https://npmjs.org/package/aws-s3-multipart-copy
-<!--[npm-stats]: https://nodei.co/npm/aws-s3-multipart-copy/-->
+[npm-stats]: https://nodei.co/npm/aws-s3-multipart-copy/

src/copy-object-multipart.js

@@ -1,6 +1,7 @@
 'use strict';
 
-let AWS = require('aws-sdk');
+let AWS = require('aws-sdk'),
+    _ = require('lodash');
 
 const DEFAULT_COPY_PART_SIZE_BYTES = 50000000; // 50 MB in bytes
 const DEFAULT_COPIED_OBJECT_PERMISSIONS = 'private';
@@ -11,7 +12,7 @@ let init = function (aws_s3_object, initialized_logger) {
     s3 = aws_s3_object;
     logger = initialized_logger;
 
-    if (!s3 || !(s3 instanceof AWS.S3)) {
+    if (!_.get(s3, '__proto__.api.fullName') || !(s3.__proto__.api.fullName === 'Amazon Simple Storage Service')) {
         throw new Error('Invalid AWS.S3 object received');
     } else {
         if (logger && typeof logger.info === 'function' && typeof logger.error === 'function') {
@@ -103,23 +104,23 @@ function abortMultipartCopy(destination_bucket, copied_object_name, upload_id, r
         })
         .catch((err) => {
             logger.error({ msg: 'abort multipart copy failed', context: request_context, error: err });
-            
+
             return Promise.reject(err);
         })
         .then((parts_list) => {
             if (parts_list.Parts.length > 0) {
                 logger.error({ msg: 'abort multipart copy failed, copy parts were not removed', context: request_context, parts_list: parts_list });
-                
+
                 let err = new Error('Abort procedure passed but copy parts were not removed')
                 err.details = parts_list;
 
                 return Promise.reject(err);
             } else {
                 logger.info({ msg: 'multipart copy aborted successfully: ' + JSON.stringify(parts_list), context: request_context });
-                
+
                 let err = new Error('multipart copy aborted');
                 err.details = params;
-                
+
                 return Promise.reject(err);
             }
         });