stack.yaml

AWSTemplateFormatVersion: '2010-09-09'

Description: AWS API Gateway with a Lambda Integration

Parameters:
  lambdaFunctionName:
    Type: "String"
    AllowedPattern: "^[a-zA-Z0-9]+[a-zA-Z0-9-]+[a-zA-Z0-9]+$"
    Description: Lambda function name. (Recommend to keep default)
    Default: "lambda-api"
  apiStageName:
    Type: "String"
    Description: API Staging Name. (Recommend to keep default)
    Default: "v1"
  apiResourcePath:
    Type: "String"
    Description: Resource Path for API.
    Default: "hello"

Resources:

  ApiGatewayRestApi:
    Type: AWS::ApiGateway::RestApi
    Properties:
      ApiKeySourceType: HEADER
      Description: An API Gateway for Lambda APIs
      EndpointConfiguration:
        Types:
          - REGIONAL
      Name: !Join ["", [{"Ref": "AWS::StackName"}, "-api"]]

  ProxyResource:
    Type: 'AWS::ApiGateway::Resource'
    Properties:
      RestApiId: !Ref ApiGatewayRestApi
      ParentId: !GetAtt ApiGatewayRestApi.RootResourceId
      PathPart: !Ref "apiResourcePath"

  ProxyResourceANY:
    Type: 'AWS::ApiGateway::Method'
    Properties:
      RestApiId: !Ref ApiGatewayRestApi
      ResourceId: !Ref ProxyResource
      HttpMethod: GET
      ApiKeyRequired: true
      AuthorizationType: NONE
      OperationName: !Ref "apiResourcePath"
      Integration:
        Type: AWS_PROXY
        IntegrationHttpMethod: POST
        Uri: !Sub 'arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${LambdaFunction.Arn}/invocations'

  ApiGatewayModel:
    Type: AWS::ApiGateway::Model
    Properties:
      ContentType: 'application/json'
      RestApiId: !Ref ApiGatewayRestApi
      Schema: {}

  ApiGatewayStage:
    Type: AWS::ApiGateway::Stage
    Properties:
      DeploymentId: !Ref ApiGatewayDeployment
      Description: Lambda API Stage v1
      RestApiId: !Ref ApiGatewayRestApi
      StageName: !Ref "apiStageName"

  ApiGatewayDeployment:
    Type: AWS::ApiGateway::Deployment
    DependsOn: ProxyResourceANY
    Properties:
      Description: Lambda API Deployment
      RestApiId: !Ref ApiGatewayRestApi

  ApiGatewayIamRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Sid: ''
            Effect: 'Allow'
            Principal:
              Service:
                - 'apigateway.amazonaws.com'
            Action:
              - 'sts:AssumeRole'
      Path: '/'
      Policies:
        - PolicyName: LambdaAccess
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: 'Allow'
                Action: 'lambda:*'
                Resource: !GetAtt LambdaFunction.Arn
  
  LambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        ZipFile: |
          exports.handler = async function(event, context) {
            return { statusCode: 200, body: 'Hello World!' };
          };
      Description: API Lambda function
      FunctionName: !Ref "lambdaFunctionName"
      Handler: index.handler
      MemorySize: 512
      Role: !GetAtt LambdaIamRole.Arn
      Runtime: nodejs12.x
      Timeout: 60

  LambdaIamRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: 'Allow'
            Principal:
              Service:
                - 'lambda.amazonaws.com'
            Action:
              - 'sts:AssumeRole'
      Path: '/'
      Policies:
        - PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Action:
                  - "logs:CreateLogGroup"
                  - "logs:CreateLogStream"
                  - "logs:PutLogEvents"
                Effect: "Allow"
                Resource:
                  - !Sub "arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/${lambdaFunctionName}:*"
          PolicyName: !Join ["", [{"Ref": "AWS::StackName"}, "-lambda-log"]]

  LambdaPermission:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !GetAtt LambdaFunction.Arn
      Action: lambda:InvokeFunction
      Principal: 'apigateway.amazonaws.com'

  LambdaLogGroup:
    Type: "AWS::Logs::LogGroup"
    Properties:
      LogGroupName: !Sub "/aws/lambda/${lambdaFunctionName}"
      RetentionInDays: 3
  ApiKey: 
    Type: AWS::ApiGateway::ApiKey
    Properties: 
      Name: !Join ["", [{"Ref": "AWS::StackName"}, "-apikey"]]
      Description: !Join ["", [{"Ref": "AWS::StackName"}, "api key"]]
      Enabled: true
      GenerateDistinctId: false
  ApiUsagePlan:
    Type: "AWS::ApiGateway::UsagePlan"
    DependsOn: ApiGatewayStage
    Properties:
      ApiStages: 
      - ApiId: !Ref ApiGatewayRestApi
        Stage: !Ref "apiStageName"    
      Description: !Join [" ", [{"Ref": "AWS::StackName"}, "usage plan"]]
      UsagePlanName: !Join ["", [{"Ref": "AWS::StackName"}, "-usage-plan"]]
  ApiUsagePlanKey:
    Type: "AWS::ApiGateway::UsagePlanKey"
    Properties:
      KeyId: !Ref ApiKey
      KeyType: API_KEY
      UsagePlanId: !Ref ApiUsagePlan