Create GET API

  1. Open template.yaml in fcj-book-shop folder.

  2. Add the following script at the end of the file that creates a REST API and GET method.

    • Firstly, we will create stage parameter.

      stage:
  Type: String
  Default: staging

      CreateGetAPI

    • Next, add the following scripts to create BookApiGet method, BookApiDeployment deployment, BookApiStage stage and BookApiGetInvokePermission permission.

      BookApiGet:
  Type: AWS::ApiGateway::Method
  Properties:
    HttpMethod: GET
    RestApiId: !Ref BookApi
    ResourceId: !Ref BookApiResource
    AuthorizationType: NONE
    Integration:
      Type: AWS_PROXY
      IntegrationHttpMethod: POST # For Lambda integrations, you must set the integration method to POST
      Uri: !Sub >-
        arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${BooksList.Arn}/invocations
      IntegrationResponses:
        - StatusCode: "200"
          ResponseParameters:
            method.response.header.Access-Control-Allow-Origin: "'*'"
            method.response.header.Access-Control-Allow-Methods: "'GET,POST,OPTIONS'"
            method.response.header.Access-Control-Allow-Headers: "'Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token'"
    MethodResponses:
      - StatusCode: "200"
        ResponseParameters:
          method.response.header.Access-Control-Allow-Origin: "'*'"
          method.response.header.Access-Control-Allow-Methods: "'GET,POST,OPTIONS'"
          method.response.header.Access-Control-Allow-Headers: "'Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token'"

BookApiDeployment:
  Type: AWS::ApiGateway::Deployment
  Properties:
    RestApiId: !Ref BookApi
  DependsOn:
    - BookApiGet

BookApiStage:
  Type: AWS::ApiGateway::Stage
  Properties:
    RestApiId: !Ref BookApi
    StageName: !Ref stage
    DeploymentId: !Ref BookApiDeployment

BookApiGetInvokePermission:
  Type: AWS::Lambda::Permission
  Properties:
    FunctionName: !Ref BooksList
    Action: lambda:InvokeFunction
    Principal: apigateway.amazonaws.com
    SourceAccount: !Ref "AWS::AccountId"

      CreateGetAPI

  3. Run the following command to deploy SAM.

    sam build
sam validate
sam deploy

    CreateGetAPI

  4. Open AWS API Gateway console.

    • Click fcj-serverless-api REST api. PrepRestApi
    • At fcj-serverless-api resources page.
      • Click Resources.
      • Select GET.
      • Click Lambda integration and check the books_list function. CreateGetAPI
      • Click Stages.
      • Select GET.
      • Copy and save the Invoke URL. CreateGetAPI