i am trying to get the file information from a file on my Amazon S3 server using the aws-sdk node module.
What i want to get out is the file name, file type and size.
I have attempted the following methods without luck:
s3.headObject(params, function (err, data) {
if (err) {
console.log(err, err.stack)
}
else {
d.resolve(data);
}
});
And
s3.getObject(params, function (err, data) {
if (err) {
console.log(err, err.stack)
}
else {
d.resolve(data);
}
});
Looking through their documentation i cant seem to find any other method that will give me the information i need.
So my question to you is how do i get the above information?
Here is the code to get the file name, size and content-type of all the objects present in a bucket.
Change the bucket name
Load your access keys from config.json accordingly
Code:-
var AWS = require('aws-sdk');
// Load credentials and set region from JSON file
AWS.config.loadFromPath('./config.json');
// Create S3 service object
s3 = new AWS.S3({ apiVersion: '2006-03-01' });
var bucketName = 'yourBucketName';
var params = {
Bucket: bucketName
};
var headParams = {
Bucket: bucketName
};
listAllKeys();
function listAllKeys() {
s3.listObjectsV2(params, function (err, data) {
if (err) {
console.log(err, err.stack); // an error occurred
} else {
var contents = data.Contents;
contents.forEach(function (content) {
//console.log(JSON.stringify(content));
headParams["Key"] = content.Key;
s3.headObject(headParams, function (err, headObjectData) {
if (err) {
console.log(err, err.stack);
} else {
console.log("1. File name :" + content.Key + ";" + " 2. File size :" + content.Size + ";" + " 3. Content-Type :" + headObjectData.ContentType);
}
});
});
if (data.IsTruncated) {
params.ContinuationToken = data.NextContinuationToken;
console.log("get further list...");
listAllKeys();
}
}
});
}
Sample output:-
1. File name :index.html; 2. File size :48; 3. Content-Type :text/html
s3.headObject works fine. You can find sample code below
let primaryBucket = primarys3bucketname;
var headParams = {
Bucket: primaryBucket,
};
let size = '';
headParams["Key"] = "/sample/path/to/filename.pdf";
s3.headObject(headParams).promise().then((headObjectData) => {
size = this.bytesToSize(headObjectData.ContentLength);
});
function bytesToSize(bytes) {
var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
if (bytes == 0) return '0 Byte';
var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
return Math.round(bytes / Math.pow(1024, i), 2) + ' ' + sizes[i];
};