AWS Lambda function write to S3

Question

I have a Node 4.3 Lambda function in AWS. I want to be able to write a text file to S3 and have read many tutorials about how to integrate with S3. However, all of them are about how to call Lambda functions after writing to S3.

How can I create a text file in S3 from Lambda using node? Is this possible? Amazons documentation doesn't seem to cover it.

Answer 1

Use this code for doing that:

var AWS = require('aws-sdk');

function putObjectToS3(bucket, key, data){

    var s3 = new AWS.S3();

        var params = {

            Bucket : bucket,

            Key : key,

            Body : data

        }

        s3.putObject(params, function(err, data) {

          if (err) console.log(err, err.stack); // an error occurred

          else     console.log(data);           // successful response

        });

}

Also, the Lambda requires S3 write permissions for that particular S3 bucket and it’s key.

IAM Statement to add:

{

    "Sid": "Stmt1468366974000",

    "Effect": "Allow",

    "Action": "s3:*",

    "Resource": [

        "arn:aws:s3:::bucket_name/optional_path_before_allow/*"

    ]

}