template.yaml

# For further info on SAM template, go to: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-specification-template-anatomy.html
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  ts-simple-api-proxy-with-sam

  Sample SAM Template for ts-simple-api-proxy

# We can add parameters
Parameters:
  ApiStageName:
    Type: String
    Default: test

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 120
  Api:
    Cors:
      AllowMethods: "'GET,POST'"
      AllowHeaders: "'Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token'"
      AllowOrigin: "'*'"

Resources:
  TsSimpleApiProxyFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: ./ # This has to be either the local folder where we have package.json or S3 bucket
      Handler: ./dist/main.example # name of the handler function in src/handler.js
      Runtime: nodejs16.x
      Description: Example Lambda Function
      FunctionName: ts-simple-api-proxy-with-sam
      MemorySize: 1024
      Timeout: 15
      Events:
        TsSimpleApiProxy:
          Type: Api # Creates API Gateway. More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /get-users
            Method: get
            RestApiId: !Ref ApiDeployment # This defines the stage name.
      Policies: # Creates IAM Role
        # We can choose from a list of policy templates which are specific to SAM
        # See: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-policy-templates.html
        - SSMParameterReadPolicy:
            ParameterName: mock-parameter # For this policy, ParameterName is required
  ApiDeployment:
    Type: AWS::Serverless::Api
    Properties:
      StageName: !Ref ApiStageName # This is where we can set stage name


Outputs:
  # ServerlessRestApi is an implicit API created out of Events key under Serverless::Function
  # Find out more about other implicit resources you can reference within SAM
  # https://github.com/awslabs/serverless-application-model/blob/master/docs/internals/generated_resources.rst#api
  TsSimpleApiProxyApi:
    Description: "API Gateway endpoint URL for function"
    # To add stage, ServerlessRestApi needs to be changed to the name of the resources define AWS::Serverless:Api. 
    # Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/test/get-users" # This is the default
    # We can refer any top level parameter with ${NameOfParameter}.
    Value: !Sub "https://${ApiDeployment}.execute-api.${AWS::Region}.amazonaws.com/${ApiStageName}/get-users"

  TsSimpleApiProxyFunction:
    Description: "Lambda Function ARN"
    Value: !GetAtt TsSimpleApiProxyFunction.Arn
  TsSimpleApiProxyFunctionIamRole:
    Description: "Implicit IAM Role created for the function"
    Value: !GetAtt TsSimpleApiProxyFunction.Arn