How can I retrieve a user's public IP address via Amazon API Gateway + Lambda (node)

问题

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?

回答1:

Here is a simple demonstration of using API Gateway's $context.identity.sourceIp in a Lambda function.

API Mapping template:

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

Lambda function:

'use strict';
console.log('Loading function');
exports.handler = (event, context, callback) => {
    console.log('SourceIP =', event.identity.sourceIP);
    callback(null, event.identity.sourceIP);
};

回答2:

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