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I'm currently writing a Node.js lambda function, in which I want to log the incoming requester's public IP address. I've been looking through both the API Gateway and Lambda docs all day, but haven't found a solution.
Does the lambda event object include request metadata I can use to extract the user's IP?
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This function simply prints the public IP used by lambda(which is our NAT instance IP) and then stops our NAT instance. That's all for setup. Once the trigger lambda is executed, check the logs for ip lambda to make sure the setup is working fine.
Your API gateway is now accessible via static IP addresses provided by AWS Global Accelerator.
Update for HTTP APIs
Adding @Elijah's comment. The format for HTTP APIs will be
event['requestContext']['http']['sourceIp'] Edit
A better way is actually to check
event['requestContext']['identity']['sourceIp'] You can also get the User-Agent from the same object
event['requestContext']['identity']['userAgent'] See Cesar's comment below. Headers are easily spoofed and the user can set X-Forwarded-For to anything. AFAIK the sourceIp above is retrieved from the TCP connection.
Original answer
As of September 2017, you can create a method in API Gateway with Lambda Proxy integration, this will give you access to
events['headers']['X-Forwarded-For'] Which will look something like 1.1.1.1,214.25.52.1
The first ip 1.1.1.1 is your user's public ip address.
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