sam local start-api に authorizer を設定（ごり押し

cf. https://github.com/aws/aws-sam-cli/issues/137

要望はめっちゃあるのに対応する気なさそうなので、

ごり押し

template.yaml は sam init したサンプルそのままです。

template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  python3.8

  Sample SAM Template for sam-app

Globals:
  Function:
    Timeout: 3

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      PackageType: Image
      Architectures:
        - x86_64
      Events:
        HelloWorld:
          Type: Api
          Properties:
            Path: /hello
            Method: get
    Metadata:
      Dockerfile: Dockerfile
      DockerContext: ./hello_world
      DockerTag: python3.8-v1

app.py

import os
import json

def lambda_handler(event, context):
    print(event["requestContext"]["authorizer"])

    return {
        "statusCode": 200,
        "body": json.dumps(
            {
                "message": "hello world",
            }
        ),
    }

if os.getenv("AWS_SAM_LOCAL"):
    def phony_authorizer(authorizer):
        def _inner(f):
            def _wrapper(event, context):
                event["requestContext"]["authorizer"] = authorizer
                return f(event, context)

            return _wrapper
        return _inner

    lambda_handler = phony_authorizer(
      {
        "key": "value",
        "principalId": None,
        "integrationLatency": 5563,
      }
    )(lambda_handler)

確認

bash

$ sam build && sam local start-api

で api を起動して、別のターミナルから

bash

$ curl http://127.0.0.1:3000/hello
{"message": "hello world"}

とやると、 start-api 側のターミナルに

bash

Invoking Container created from helloworldfunction:python3.8-v1
Building image.................
Skip pulling image and use local one: helloworldfunction:rapid-1.37.0-x86_64.

{'key': 'value', 'principalId': None, 'integrationLatency': 5563}
END RequestId: 08d36d6d-ae15-4cd8-af8b-bf561d826156
REPORT RequestId: 08d36d6d-ae15-4cd8-af8b-bf561d826156  Init Duration: 0.52 ms  Duration: 76.82 ms  Billed Duration: 77 ms  Memory Size: 128 MB Max Memory Used: 128 MB
No Content-Type given. Defaulting to 'application/json'.
2022-01-15 09:14:47 127.0.0.1 - - [15/Jan/2022 09:14:47] "GET /hello HTTP/1.1" 200 -

とか出るはず。