Image Gallery using ICOS API

$ cf login --sso

$ git clone https://github.com/IBMRedbooks/IBMRedbooks-SG248385-Cloud-Object-Storage-as-a-Service.git
$ cd IBMRedbooks-SG248385-Cloud-Object-Storage-as-a-Service\COS-WebGalleryStart
$ npm install
$ npm start

$ cf push

var imageUploadRouter = require('./src/routes/imageUploadRoutes')(title);
var galleryRouter = require('./src/routes/galleryRoutes')(title);

app.use('/gallery', galleryRouter);
app.use('/', imageUploadRouter);

var express = require('express');
var imageUploadRouter = express.Router();
var status = '';

var router = function(title) {
    //galleryController를 가져옴
    var galleryController =
        require('../controllers/galleryController')(title);
        //현재위치 (https://url/)에서 post로 request
        imageUploadRouter.route('/')
        .post(
            //Controller의 uprload함수를 호출
            galleryController.upload.array('img-file', 1), function (req, res, next) {
                if(res.statusCode===200 && req.files.length > 0) 
                {//성공시
                    status = 'uploaded file successfully';
                }
                else 
                {//실패
                    status = 'upload failed';
                }
                //이상의 결과(status와 title)를 담아서 index.ejs에 렌더링
                res.render('index', {status: status, title: title});
            });
    return imageUploadRouter;
};
//app.js에서 해당 모듈을 require해서 사용할수있게 export
module.exports = router;

var express = require('express');
var galleryRouter = express.Router();

var router = function(title) {

    //galleryController를 가져옴
    var galleryController =
        require('../controllers/galleryController')(title);
    //현재위치 (https://url/)에서 get으로 request
    //Controller의 getGalleryImages함수 호출
    galleryRouter.route('/')
        .get(galleryController.getGalleryImages);

    return galleryRouter;
};
//app.js에서 해당 모듈을 require하여 사용할수있게 export
module.exports = router;

var galleryController = function(title) {
    var aws = require('aws-sdk'); //aws api를 사용하기위해 추가
    var multer = require('multer'); //파일업로드를 도와주는 multer모듈추가
    var multerS3 = require('multer-s3');//업로드한 파일을 S3에 바로 저장시키기위한 multer-s3

    //s3프로토콜을 위한 정보 기입
    var ep = new aws.Endpoint('https://s3.us-south.cloud-object-storage.appdomain.cloud');
    var s3 = new aws.S3({endpoint: ep, region: 'us-south'});
    //cos bucket name
    var myBucket = 'web-images-bucket';

    ...
    return {
        getGalleryImages: getGalleryImages,
        upload: upload
    };
};

module.exports = galleryController;

    var upload = multer({
        storage: multerS3({
            s3: s3,
            bucket: myBucket,
            key: function (req, file, cb) {
                cb(null, file.originalname);
                console.log(file);
            }
        })
    });

{ fieldname: 'img-file',
  originalname: 'nyan.gif',
  encoding: '7bit',
  mimetype: 'image/gif' }

    var getGalleryImages = function (req, res) {

        var imageUrlList = [];
        var params = {Bucket: myBucket};
        //버킷에 있는 개체의 데이터를 반환
        s3.listObjectsV2(params, function (err, data) {
            if(data) {
                var bucketContents = data.Contents;
                //버킷에 들어있는 데이터 개수만큼
                for (var i = 0; i < bucketContents.length; i++) {
                    var bcKey=bucketContents[i].Key;
                    //파일확장자 jpg png gif만 처리
                    if(bcKey.search(/.jpg/) > -1||bcKey.search(/.png/) > -1||bcKey.search(/.gif/) > -1) {
                        var urlParams = {Bucket: myBucket, Key: bucketContents[i].Key};
                        //개체의 버킷 이름 및 키를 전달하면 모든 개체에 대해 사인된 URL을 반환
                        s3.getSignedUrl('getObject', urlParams, function (err, url) {
                            imageUrlList[i] = url;
                        });
                    }
                }
            }
            //galleryView.ejs로 렌더링
            res.render('galleryView', {
                title: title,
                imageUrls: imageUrlList
            });
        });
    };

added 6 packages from 55 contributors, removed 1 package, updated 1 package and audited 3030 packages in 6.894s
found 4 vulnerabilities (2 low, 2 moderate)
  run `npm audit fix` to fix them, or `npm audit` for details

 var getGalleryImages = function (req, res) {

        var imageUrlList = [];
        var params = {Bucket: myBucket};
        function getBucketData_promise(params){
          //첫번째 promise함수선언
            return new Promise(function(resolve, reject){
                s3.listObjectsV2(params, function (err, data) {
                    if(data) {
                        var bucketContents = data.Contents;
                        resolve(bucketContents);
                    }
                    else{
                        reject(err);
                    }
                });
            });
        }
        function getImageUrl_promise(urlParams){
            //두번째 promise함수선언
            return new Promise(function(resolve, reject){
                s3.getSignedUrl('getObject', urlParams, function (err, url) {
                    if(url) {
                        resolve(url);
                    }
                    else{
                        reject(err);
                    }
                });
            });
        }
        //첫번째 promise함수실행
        getBucketData_promise(params)
            //await함수를 사용하기위해 async함수가있다는것을 알림
            .then(async function(bucketContents){
                for (var i = 0; i < bucketContents.length; i++) {
                    var bcKey=bucketContents[i].Key;
                    if(bcKey.search(/.jpg/) > -1||bcKey.search(/.png/) > -1||bcKey.search(/.gif/) > -1) {
                        var urlParams = {Bucket: myBucket, Key: bucketContents[i].Key};
                        //두번째 promise함수가 실행될때까지 기다려줌 (await)
                        await getImageUrl_promise(urlParams)
                            .then(async function(url){
                                imageUrlList[i] = url;
                            });
                    }
                }
                return imageUrlList;
            })//첫번째 promise함수가 끝나면 렌더링
            .then(function(urlData){
                res.render('galleryView', {
                    title: title,
                    imageUrls: urlData
                });
            });
    };