template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 60
    MemorySize: 256

Resources:
  NasdaqNewsScraperLambda:
    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: NasdaqNewsScraperLambda
      Handler: com.vai.news.lambda.NasdaqNewsScraperLambda::handleRequest
      Runtime: java8
      Environment: # More info about Env Vars: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#environment-object
        Variables:
          NOTIFICATION_TOPIC_ARN:
            Ref: NewsNotificationTopic
      Events:
        Scrape:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /scrape
            Method: get
      Role:
        Fn::GetAtt: [NasdaqNewsScraperLambdaExecutionRole, Arn]

  NasdaqNewsScraperLambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Statement:
          - Action: ['sts:AssumeRole']
            Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
        Version: '2012-10-17'
      Policies:
        - PolicyName: NasdaqNewsScraperLambdaExecutionPolicy
          PolicyDocument:
            Statement:
              - Action:
                  - sns:Publish
                Effect: Allow
                Resource:
                  Ref: NewsNotificationTopic

  NewsNotificationTopic:
    Type: AWS::SNS::Topic
    Properties:
      TopicName: NewsNotificationTopic

  NewsNotificationTopicPolicy:
    Type: AWS::SNS::TopicPolicy
    Properties:
      PolicyDocument:
        Version: "2012-10-17"
        Id: NewsNotificationTopicPublishPolicy
        Statement:
          - Sid: News-Notification-Topic-Publish-Policy
            Action: sns:Publish
            Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Resource:
              Ref: NewsNotificationTopic
            Condition:
              ArnEquals:
                aws:SourceArn:
                  Fn::GetAtt: [NasdaqNewsScraperLambda, Arn]
      Topics:
        - Ref: NewsNotificationTopic

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
  NasdaqScraperApi:
    Description: "API Gateway endpoint URL for Prod stage for News Scraping function"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/scrape/"
  NasdaqNewsScraperLambda:
    Description: "News Scraping Lambda Function's ARN"
    Value: !GetAtt NasdaqNewsScraperLambda.Arn
  NasdaqNewsScraperLambdaIamRole:
    Description: "Implicit IAM Role created for News Scraping function"
    Value: !GetAtt NasdaqNewsScraperLambdaExecutionRole.Arn