Implementing IAM Policies for AWS Lambda

Create a Lambda function using the code below. Be sure to include the S3 bucket name.

import boto3

def lambda_handler(event, context):
    # Specify the S3 bucket name
    s3_bucket = ""

    # Specify the new blank file key
    new_file_key = "blank_file.txt"

    # Initialize the S3 client
    s3_client = boto3.client('s3')

    # Create a blank text file content
    blank_content = ''

    try:
        # Put the blank text file into the specified S3 bucket
        s3_client.put_object(Body=blank_content, Bucket=s3_bucket, Key=new_file_key)

        print(f"Blank file created: s3://{s3_bucket}/{new_file_key}")

        return {
            'statusCode': 200,
            'body': 'Blank file creation complete!'
        }

    except Exception as e:
        print(f"Error: {str(e)}")
        return {
            'statusCode': 500,
            'body': 'Error creating blank file'
        }

Add an event trigger to the Lambda function that triggers for "all new object create events" within the S3 bucket.

Navigate to the IAM dashboard and attach the AmazonS3FullAccess AWS managed IAM policy to the Lambda function's role.

Upload a file of your choice to the S3 bucket.

Confirm that the upload of a file object to the S3 bucket triggered the Lambda function to create a blank text file in the same S3 bucket.