AWS with JavaScript

JavaScript에서 AWS 사용방법

1. AWS S3 설정 변경
     - S3 버킷 클릭 -> 권한탭 -> CORS 구성 클릭 후 하단 코드 추가

<?xml version="1.0" encoding="UTF-8"?> 
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    <CORSRule>
        <AllowedOrigin>*</AllowedOrigin>
        <AllowedMethod>POST</AllowedMethod>         
        <AllowedMethod>GET</AllowedMethod>         
        <AllowedMethod>PUT</AllowedMethod>        
        <AllowedMethod>DELETE</AllowedMethod>         
        <AllowedMethod>HEAD</AllowedMethod>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
</CORSConfiguration>

2. JavaScript
     - <script src="https://sdk.amazonaws.com/js/aws-sdk-2.283.1.min.js"></script> 추가
     - 기본 AWS 세팅 코드 추가
 

...
<script src="https://sdk.amazonaws.com/js/aws-sdk-2.283.1.min.js"></script>
...
<script>
...
var albumBucketName = '버킷명';
var bucketRegion = '리전명 예 : ap-northeast-2';
var IdentityPoolId = 'pool-id';

AWS.config.update({
  region: bucketRegion,
  credentials: new AWS.CognitoIdentityCredentials({
    IdentityPoolId: IdentityPoolId
  })
});

var s3 = new AWS.S3({
  apiVersion: '2006-03-01',
  params: {Bucket: albumBucketName}
});

...
</script>

     2.1. 항목 업로드
              - 서브 경로명 입력시, 없다면 자동으로 생성됨.
              - blob의 url을 바로 사용할 수 없고, file로 변환 후 file을 업로드 해야함. 
              - 예 : 

//이 예제에선 blob을 사용한 url을 업로드함

function uploadToAWS(blob, fileName)
{
  var albumPhotosKey = encodeURIComponent('서브경로명') + '/';
  var photoKey = albumPhotosKey + fileName;
  var file = new File([blob],fileName);

 s3.upload({
    Key: photoKey,
    Body: file,
    ACL: 'public-read'
  }, function(err, data) {
    if (err) {
      return alert('There was an error uploading : ', err.message);
    }
    alert('Successfully uploaded photo.');
  });
}

     2.2. PresignedURL
              - private 의 항목을 임시 url 생성 (타임아웃 지정)
              - access key, secret key 관련 참조 : https://mintpot.synology.me:30000/boards/2/topics/195
              - 예 : 

var bucketName = '버킷명칭';
var bucketRegion = 'ap-northeast-2'; //리전

AWS.config.update({
  region: bucketRegion,
  credentials: {
   accessKeyId: '', //access key
   secretAccessKey: // secret access key
  }
});

const s3 = new AWS.S3({
  apiVersion: '2006-03-01',
  params: {Bucket: bucketName, signatureVersion: 'v4' }
});

function GetURL()
{
	var params = {Bucket: bucketName , Key: "파일 위치(버킷명 이후경로)", Expires: 60};
	var url = s3.getSignedUrl('getObject', params);
	console.log('The URL is', url);
    return url; 
}