how to retrieve image from s3 with nodejs - node.js

Question

Please let me know how to retrieve image from s3 with nodejs? Honestly, I could upload an image to s3 with nodejs as follows but the problem is how can I complete to retrieve image from s3?
router.get('/image/:imageId', function (req, res, next) {
// ????
});
var s3 = new aws.S3({ accessKeyId: config.awsAccessId, secretAccessKey: config.awsAccessKey});
var upload = multer({
storage: multerS3({
s3: s3,
bucket: config.bucket,
key: function (req, file, cb) {
cb(null, file.originalname);
}
})
});
router.post('/upload/:id', upload.array('file', 3), function(req, res, next) {
res.send('Successfully uploaded ' + req.files.length + ' files!');
});

Answer 1

I've finally found that,
var params = { Bucket: config.bucket, Key: req.params.imageId };
s3.getObject(params, function(err, data) {
res.writeHead(200, {'Content-Type': 'image/jpeg'});
res.write(data.Body, 'binary');
res.end(null, 'binary');
});

Answer 2

If you use lambda with API gateway to retrieve images then there will be no need to using security keys with appropriate permissions.
Read an image from the bucket and send it as base64 to directly use it in source of image tag in HTML.
const AWS = require('aws-sdk');
//*/ get reference to S3 client
var s3 = new AWS.S3();
exports.handler = (event, context, callback) => {
var params = {
"Bucket": "bucket-name",
"Key": "object-name"
};
s3.getObject(params, function(err, data){
if(err) {
callback(err, null);
} else {
let image = new Buffer(data.Body).toString('base64');
image = "data:"+data.ContentType+";base64,"+image;
let response = {
"statusCode": 200,
"headers": {
"Access-Control-Allow-Origin": "*",
'Content-Type': data.ContentType
},
"body":image,
"isBase64Encoded": true
};
callback(null, response);
}
});
};

Answer 3

You're looking for the getObject() method.

Answer 4

Assuming that you are using aws-sdk then you can use getObject method.
Here is sample code
exports.getObjects = function (req, res) {
var item = req.body;
var params = { Bucket: req.params.bucketName, Key: 'keyname'}; // keyname can be a filename
s3.getObject(params, function (err, data) {
if (err) {
return res.send({ "error": err });
}
res.send({ data });
});
}
This link may be helpful to you.

Answer 5

A better and faster approach is piping the stream to response, works on Minio S3 Client but I believe it also works on aws amazon js client.
const Minio = require('minio');
const s3Client = new Minio.Client({
endPoint: 'ep',
accessKey: 'ak',
secretKey: 'sk'
});
router.get('/image/:imageId', (req, res) => {
const { imageId } = req.params;
s3Client.getObject('bucket', imageId, (err, stream) => {
if (err) return res.status(500).send(err);
const contentType = stream.headers['content-type'];
contentType && res.setHeader('Content-Type', contentType);
stream.pipe(res);
});
});

Answer 6

This is what I use with aws-sdk
const params = { Bucket: "YOUR_BUCKET_NAME", Key: "YOUR_FILENAME"};
s3.getObject(params).createReadStream().pipe(res);