AWS lambda function to delete a file from s3 bucket

aws-lambda-to-delete-file-from-s3.md

Create lambda function to delete a file from s3

1. Create IAM Role with s3 access
2. Create Lambda function(delete-s3-file) with Ruby 2.7

require 'aws-sdk-s3'
S3_CLIENT = Aws::S3::Client.new

def lambda_handler(event:, context:)
   resp = S3_CLIENT.delete_object({
     bucket: event['bucket'], 
     key: event['file_path']
   })
   { statusCode: 200, body: resp.to_h }
end

3. Change Retry attempts settings to 0 in Asynchronous invocation section since we don't need to retry in our usecase
4. Attach s3 delete access role which is created in step 1

Create Group in IAM for ca-next

1. Create group(ca-next-developers) with s3 access
2. Add Lambda invoke access policy

• Edit group -> Permission -> Inline Policies -> Create one
• Choose Policy Generator and click on Select
• Allow AWS lambda InvokeAsync and InvokeFunction

3. Add our existing user to group