Source and details for the S3-Lambda tutorial, that creates a thumbnail, triggered by an upload.
See also https://docs.aws.amazon.com/en_pv/lambda/latest/dg/with-s3-example.html.
You need python 2.6 or higher (I used python 3.7).
pip3 install aws-cliIn order to use the cli correctly, you need to call aws configure and fill in the required attributes.
For the access id and secret, you need to create a user for cli access, and select AdministratorAccess as policy.
After creation of the user, you can download the credentials as csv file.
Look up the correct region identifier for your region here https://docs.aws.amazon.com/general/latest/gr/rande.html (e.g. eu-central-1 for Frankfurt).
The source for the function is located in index.js.
Run npm run build.