Create APIs

We will create APIs to integrate with the functions created in the previous step.

1. Open template.yaml file of source code folder - fcj-book-store-sam-ws6

• Add following script under /confirm_user api to create /books/order resource with GET method

          /books/order:
            get:
              responses:
                "200":
                  description: 200 response
                  headers:
                    Access-Control-Allow-Origin:
                      type: string
              x-amazon-apigateway-integration:
                uri:
                  Fn::Sub: "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${OrderManagement.Arn}/invocations"
                responses:
                  default:
                    statusCode: 200
                    responseParameters:
                      method.response.header.Access-Control-Allow-Origin: "'*'"
                passthroughBehavior: when_no_match
                httpMethod: POST #always POST
                type: aws_proxy

• Add following script to create POST method

            post:
              responses:
                "200":
                  description: 200 response
                  headers:
                    Access-Control-Allow-Origin:
                      type: string
              x-amazon-apigateway-integration:
                uri:
                  Fn::Sub: "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${CheckOutOrder.Arn}/invocations"
                responses:
                  default:
                    statusCode: 200
                    responseParameters:
                      method.response.header.Access-Control-Allow-Origin: "'*'"
                passthroughBehavior: when_no_match
                httpMethod: POST #always POST
                type: aws_prox

• Add following script to create DELETE method

            delete:
              responses:
                "200":
                  description: 200 response
                  headers:
                    Access-Control-Allow-Origin:
                      type: string
              x-amazon-apigateway-integration:
                uri:
                  Fn::Sub: "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${DeleteOrder.Arn}/invocations"
                responses:
                  default:
                    statusCode: 200
                    responseParameters:
                      method.response.header.Access-Control-Allow-Origin: "'*'"
                passthroughBehavior: when_no_match
                httpMethod: POST #always POST
                type: aws_proxy

• Add following script to create /books/order/handle resource with POST method

          /books/order/handle:
            post:
              responses:
                "200":
                  description: 200 response
                  headers:
                    Access-Control-Allow-Origin:
                      type: string
              x-amazon-apigateway-integration:
                uri:
                  Fn::Sub: "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${HandleOrder.Arn}/invocations"
                responses:
                  default:
                    statusCode: 200
                    responseParameters:
                      method.response.header.Access-Control-Allow-Origin: "'*'"
                passthroughBehavior: when_no_match
                httpMethod: POST #always POST
                type: aws_proxy

2. Add event source for Lambda functions to integrate with APIs

• Add following script under the CheckOutOrder function

      Events:
        ConfirmUser:
          Type: Api
          Properties:
            Path: /books/order
            Method: post
            RestApiId:
              Ref: BookApi

• Add following script under the OrderManagement function

      Events:
        ConfirmUser:
          Type: Api
          Properties:
            Path: /books/order
            Method: get
            RestApiId:
              Ref: BookApi

• Add following script under the HandleOrder function

      Events:
        ProcessOrder:
          Type: Api
          Properties:
            Path: /books/order/handle
            Method: post
            RestApiId:
              Ref: BookApi

• Add following script under the DeleteOrder function

      Events:
          DeleteOrder:
            Type: Api
            Properties:
              Path: /books/order
              Method: delete
              RestApiId: 
                Ref: BookApi

3. Run the below commands

sam build
sam deploy --guided

• Enter “y” if asked “CheckOurOrder may not have authorization defined, Is this okay? [y/N]:”
• Enter “y” if asked “OrderManagement may not have authorization defined, Is this okay? [y/N]:”
• Enter “y” if asked “HandleOrder may not have authorization defined, Is this okay? [y/N]:”
• Enter “y” if asked “DeleteOrder may not have authorization defined, Is this okay? [y/N]:”

So we have completed the setup steps. The next part we will check the website operation