Hacking AWS API Gateway e AWS Lambda

ApiGatewayInvokeLambda

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Resource": [
                "*"
            ],
            "Action": [
                "lambda:InvokeFunction"
            ]
        }
    ]
}

index.js

(function () {
  //Todos os logs são enviados para o CloudWatch
  console.log('Loading function');

  var AWS = require('aws-sdk');
  AWS.config.region = 'us-east-1';

  exports.handler = function(event, context) {
      console.log("Loading handler");

      var sns = new AWS.SNS();
      var topicArn = "{{o ARN do tópico SNS aqui}}";
      var data = {};

      data.createdAt = new Date().toJSON();
      data.messageId = event.messageId;
      data.publisherId = event.publisherId;
      data.score = event.score;

      console.log("Data being sent to SNS:", data);

      sns.publish({
          Message: JSON.stringify(data),
          TopicArn: topicArn
      }, function(err) {
          if (err) {
              context.fail(err.stack)
          } else {
              console.log('push sent');
              context.succeed('Function Finished!');
          }
      });
  };

})()

LambdaLogs

{
  "Version": "2012-10-17", 
  "Statement": [
    {
      "Action": [ 
        "logs:*"
      ],
      "Effect": "Allow", 
      "Resource": "arn:aws:logs:*:*:*"
    }
  ]
}

LambdaPublishSNS

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "sns:Publish"
            ],
            "Resource": "{{ARN do seu tópico SNS aqui}}"
        }
    ]
}

mapping_template.json

{
    "messageId": "$input.params('messageId')",
    "publisherId": "$input.params('publisherId')",
    "score": "$input.params('score')"
}