This is a simple Python handler for AWS Lambda to determine a user's geo-location based on their IP. To map IP's to countries (or cities if you choose), we use MaxMind's GeoLite2 database which can be downloaded here: https://dev.maxmind.com/geoip/geoip2/geolite2/

There are many ways to configure API Gateway to fit your needs. The minimum things you need to do to expose this lambda function are the following:

1. Create a new resource and add a GET method
2. To the Body Mapping Templates in the Integration Request add the following:

{
  "requesterIp" : "$context.identity.sourceIp"
}

3. Congrats! This is the minimal setup to request your lambda function through API gateway.