cloudformation2-sns-lambda-gateway.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: Create Lambda function, API Gateway, and SNS topic for topic subscription

Parameters:
  LambdaExecutionRole:
    Type: String
    Description: IAM role ARN for Lambda execution
    Default: "arn:aws:iam::426085379010:role/LabRole"  

Resources:
  EmailSubscriptionLambda:
    Type: 'AWS::Lambda::Function'
    Properties:
      Handler: lambda/index.handler
      Role: !Ref LambdaExecutionRole
      Code:
        S3Bucket: lambdamerin1
        S3Key: lambda.zip
      Runtime: nodejs18.x

  EmailSubscriptionApiGateway:
    Type: 'AWS::ApiGateway::RestApi'
    Properties:
      Name: EmailSubscriptionApi

  EmailSubscriptionResource:
    Type: 'AWS::ApiGateway::Resource'
    Properties:
      RestApiId: !Ref EmailSubscriptionApiGateway
      ParentId: !GetAtt EmailSubscriptionApiGateway.RootResourceId
      PathPart: 'lambda'

  EmailSubscriptionMethod:
    Type: 'AWS::ApiGateway::Method'
    Properties:
      RestApiId: !Ref EmailSubscriptionApiGateway
      ResourceId: !Ref EmailSubscriptionResource
      HttpMethod: 'POST'
      AuthorizationType: 'NONE'
      Integration:
        Type: 'AWS_PROXY'
        IntegrationHttpMethod: 'POST'
        Uri: !Sub 'arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${EmailSubscriptionLambda.Arn}/invocations'
      MethodResponses:
        - StatusCode: 200
          ResponseModels:
            'application/json': 'Empty'
      OperationName: 'SubscribeEmail'
      RequestModels:
        'application/json': 'Empty'

  EmailSubscriptionPermission:
    Type: 'AWS::Lambda::Permission'
    Properties:
      Action: 'lambda:InvokeFunction'
      FunctionName: !GetAtt EmailSubscriptionLambda.Arn
      Principal: 'apigateway.amazonaws.com'
      SourceArn: !Sub 'arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${EmailSubscriptionApiGateway}/*/*/*'

  EmailSubscriptionSnsTopic:
    Type: 'AWS::SNS::Topic'
    Properties:
      DisplayName: 'Email Notification'
      TopicName: 'DailyNotification'  

  ApiGatewayDeployment:
    Type: 'AWS::ApiGateway::Deployment'
    DependsOn: EmailSubscriptionMethod
    Properties:
      RestApiId: !Ref EmailSubscriptionApiGateway
      StageName: 'prod'

Outputs:
  ApiGatewayInvokeUrl:
    Description: 'URL to invoke the API Gateway endpoint'
    Value: !Sub 'https://${EmailSubscriptionApiGateway}.execute-api.${AWS::Region}.amazonaws.com/lambda/'

  SnsTopicArn:
    Description: 'ARN of the created SNS topic'
    Value: !Ref EmailSubscriptionSnsTopic