node js code for copying file from s3 to s3 bucket

Question

I want to take backup the file from one s3 bucket to another s3 bucket. I'm using lambda function with nodejs for taking backup for dynamo DB. So i want to copy the files from s3 to another s3 bucket. Can anyone tell me the nodejs code for copying files from s3 to s3?

Deependra Dangal Deependra Dangal · Accepted Answer · 2018-12-13T10:59:13

You can try the following code in lambda:

// Load the AWS SDK
const aws = require('aws-sdk');
const s3 = new aws.S3();
        
// Define 2 new variables for the source and destination buckets
var srcBucket = "YOUR-SOURCE-BUCKET";
var destBucket = "YOUR-DESTINATION-BUCKET";
var sourceObject = "YOUR-SOURCE-OBJECT";

//Main function
exports.handler = (event, context, callback) => {
        
//Copy the current object to the destination bucket
http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#copyObject-property
s3.copyObject({ 
    CopySource: srcBucket + '/' + sourceObject,
    Bucket: destBucket,
    Key: sourceObject
    }, function(copyErr, copyData){
       if (copyErr) {
            console.log("Error: " + copyErr);
         } else {
            console.log('Copied OK');
         } 
    });
  callback(null, 'All done!');
};

And Attach the following Policy to your IAM Role attached in Lambda:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "ListSourceAndDestinationBuckets",
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:ListBucketVersions"
            ],
            "Resource": [
                "arn:aws:s3:::YOUR-SOURCE-BUCKET",
                "arn:aws:s3:::YOUR-DESTINATION-BUCKET"
            ]
        },
        {
            "Sid": "SourceBucketGetObjectAccess",
            "Effect": "Allow",
            "Action": [
                "s3:GetObject",
                "s3:GetObjectVersion"
            ],
            "Resource": "arn:aws:s3:::YOUR-SOURCE-BUCKET/*"
        },
        {
            "Sid": "DestinationBucketPutObjectAccess",
            "Effect": "Allow",
            "Action": [
                "s3:PutObject"
            ],
            "Resource": "arn:aws:s3:::YOUR-DESTINATION-BUCKET/*"
        }
    ]
 }

node js code for copying file from s3 to s3 bucket

2 Answers