API Gateway の JWT オーソライザーを使用して HTTP API へのアクセスを制御する

AWSTemplateFormatVersion: '2010-09-09'
Description: |
  Example HTTP API with a JWT authorizer. This template includes an Amazon Cognito user pool as the issuer for the JWT authorizer 
  and an Amazon Cognito app client as the audience for the authorizer. The outputs include a URL for an Amazon Cognito hosted UI where clients can 
  sign up and sign in to receive a JWT. After a client signs in, the client is redirected to your HTTP API with an access token 
  in the URL. To invoke the API with the access token, change the '#' in the URL to a '?' to use the token as a query string parameter.

Resources:
  MyAPI:
    Type: AWS::ApiGatewayV2::Api
    Properties: 
      Description: Example HTTP API
      Name: api-with-auth
      ProtocolType: HTTP
      Target: !GetAtt MyLambdaFunction.Arn
  DefaultRouteOverrides:
    Type: AWS::ApiGatewayV2::ApiGatewayManagedOverrides
    Properties: 
      ApiId: !Ref MyAPI
      Route: 
        AuthorizationType: JWT
        AuthorizerId: !Ref JWTAuthorizer
  JWTAuthorizer:
    Type: AWS::ApiGatewayV2::Authorizer
    Properties: 
      ApiId: !Ref MyAPI
      AuthorizerType: JWT
      IdentitySource: 
        - '$request.querystring.access_token'
      JwtConfiguration: 
        Audience: 
        - !Ref AppClient
        Issuer: !Sub https://cognito-idp.${AWS::Region}.amazonaws.com/${UserPool}
      Name: test-jwt-authorizer
  MyLambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      Runtime: nodejs18.x
      Role: !GetAtt FunctionExecutionRole.Arn
      Handler: index.handler
      Code:
        ZipFile: |
          exports.handler = async (event) => {
              const response = {
                  statusCode: 200,
                  body: JSON.stringify('Hello from the ' + event.routeKey + ' route!'),
              };
              return response;
          };
  APIInvokeLambdaPermission:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !Ref MyLambdaFunction
      Action: lambda:InvokeFunction
      Principal: apigateway.amazonaws.com
      SourceArn: !Sub arn:${AWS::Partition}:execute-api:${AWS::Region}:${AWS::AccountId}:${MyAPI}/$default/$default
  FunctionExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
              - lambda.amazonaws.com
            Action:
              - 'sts:AssumeRole'
      ManagedPolicyArns: 
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
  UserPool:
    Type: AWS::Cognito::UserPool
    Properties:
      UserPoolName: http-api-user-pool
      AutoVerifiedAttributes:
        - email
      Schema:
        - Name: name
          AttributeDataType: String
          Mutable: true
          Required: true
        - Name: email
          AttributeDataType: String
          Mutable: false
          Required: true
  AppClient:
    Type: AWS::Cognito::UserPoolClient
    Properties:
      AllowedOAuthFlows: 
        - implicit
      AllowedOAuthScopes: 
        - aws.cognito.signin.user.admin
        - email
        - openid
        - profile
      AllowedOAuthFlowsUserPoolClient: true
      ClientName: api-app-client
      CallbackURLs:
        - !Sub https://${MyAPI}.execute-api.${AWS::Region}.amazonaws.com
      ExplicitAuthFlows:
        - ALLOW_USER_PASSWORD_AUTH
        - ALLOW_REFRESH_TOKEN_AUTH
      UserPoolId: !Ref UserPool
      SupportedIdentityProviders:
        - COGNITO 
  HostedUI:
    Type: AWS::Cognito::UserPoolDomain
    Properties: 
      Domain: !Join
        - '-'
        - - !Ref MyAPI
          - !Ref AppClient
      UserPoolId: !Ref UserPool
Outputs:
  SignupURL:
    Value: !Sub https://${HostedUI}.auth.${AWS::Region}.amazoncognito.com/login?client_id=${AppClient}&response_type=token&scope=email+profile&redirect_uri=https://${MyAPI}.execute-api.${AWS::Region}.amazonaws.com