Call Authorized Api Gateway endpoint from AWS Lambda function

Question

I'm trying to define a Lambda function that call authenticated endpoint of API Gateway (authorizationType: AWS_IAM ). I've already create the policy:

{ "Version": "2012-10-17", "Statement": [ { "Sid": "VisualEditor0", "Effect": "Allow", "Action": [ "execute-api:Invoke", "execute-api:InvalidateCache" ], "Resource": "arn:aws:execute-api:*:<account_id>:*/*/*/*" } ] }

And attach the policy to lambda. But the response from endpoint called is already 403 (forbidden). I think i have to add some authorization headers to request. This is the example lambda code (ruby):

require 'httparty' require 'json' API_GATEWAY_URL = ENV["API_GATEWAY_URL"] def lambda_handler(event:, context:) env = event&.dig("env") endpoint = event&.dig("enpoint") complete_url = "https://#{env}.#{API_GATEWAY_URL}/#{endpoint}" response = HTTParty.get(complete_url) p response.code p response.body end

Does anyone know how i can proceed ? thanks

Did you find any solution?

Radhika Gokani
– Radhika Gokani

2022-05-04 17:01:24 +00:00
Commented May 4, 2022 at 17:01 — Radhika Gokani
– Radhika Gokani, Commented May 4, 2022 at 17:01

Edcel Cabrera Vista · Accepted Answer · 2020-05-06 09:08:37Z

Did you check if the API gateway is configured with auth key?

if yes, your application should pass it through the header with the key x-api-key

API Endpoint with Auth API-Key looks like this:

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