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An AWS Lambda Based Function to Copy S3 Objects

With this AWS Lambda function, you can copy objects from a source S3 bucket to a target S3 bucket as they are added to the source bucket.

Configuration

IAM Role

Create an IAM role with the following policy:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Stmt1430872797000",
            "Effect": "Allow",
            "Action": [
                "s3:GetBucketTagging",
                "s3:GetObject",
                "s3:PutObject"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Sid": "Stmt1430872844000",
            "Effect": "Allow",
            "Action": [
                "cloudwatch:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Sid": "Stmt1430872852000",
            "Effect": "Allow",
            "Action": [
                "logs:*"
            ],
            "Resource": [
                "*"
            ]
        }
    ]
}

S3 Buckets

Ensure you have a source and target bucket. They do not need to reside in the same region.

On the source bucket, add a tag named "TargetBucket" and give it a value of the name of the target bucket.

You can specify multiple buckets delimited by spaces, e.g. StagingBucket DisasterRecoveryBucket Etc.

If the bucket is in another region, you will need to specify the region delimited with an @ token, e.g. StagingBucket@eu-central-1 DisasterRecoveryBucket@eu-west-1 BucketInSameRegion Etc.

We don't use the API to retrieve the region of the bucket to avoid burning API usages ($0.004 x 1000 requests under heavy traffic can mount up faster than you'd imagine).

If you don't specify the region for a bucket that is outside the function's region, you will see an error that looks like this:

[PermanentRedirect: The bucket you are attempting to access must be addressed using the specified endpoint. Please send all future requests to this endpoint.

Lambda Function

  1. Create a new Lambda function.
  2. Upload the file index.js as the code for your Lambda function.
  3. Add an event source to your Lambda function:
  • Event Source Type: S3
  • Bucket: your source bucket
  • Event Type: Object Created

At this point, if you upload a file to your source bucket, the file should be copied to the target bucket.