AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  Comment Moderator - automates the approval of Disqus forum comments
  based on sentiment analysis.

Metadata:
  AWS::ServerlessRepo::Application:
    Name: 'Comment-Moderator'
    Description: This application polls a forum on Disqus for unapproved comments and will approve comments automatically based upon sentiment analysis.
    Author: James Beswick
    SpdxLicenseId: mit-0
    LicenseUrl: LICENSE.txt
    ReadmeUrl: README.md
    Labels: ['disqus', 'moderation', 'sentiment', 'lambda']
    HomePageUrl: https://github.com/aws-samples/aws-serverless-sar-comment-moderator/
    SemanticVersion: 1.0.0
    SourceCodeUrl: https://github.com/aws-samples/aws-serverless-sar-comment-moderator/tree/1.0.0

Parameters:
  ForumName:
    Type: String
    Default: 'yourDisqusForumName'
    Description: (Required) The name of the Disqus forum you want to poll
    AllowedPattern: ^[A-Za-z0-9-]+$
    ConstraintDescription: 'Required parameter.'

  AccessToken:
    Type: String
    Default: 'yourDisqusAccessToken'
    Description: (Required) Disqus API access token
    AllowedPattern: ^[A-Za-z0-9]+$
    ConstraintDescription: 'Required parameter.'

  APIkey:
    Type: String
    Default: 'yourDisqusAPIkey'
    Description: (Required) Disqus API key
    AllowedPattern: ^[A-Za-z0-9]+$
    ConstraintDescription: 'Required parameter.'

  APIsecret:
    Type: String
    Default: 'yourDisqusAPIsecret'
    Description: (Required) Disqus API secret
    AllowedPattern: ^[A-Za-z0-9]+$
    ConstraintDescription: 'Required parameter.'

Globals:
  Function:
    Timeout: 15
    Environment:
      Variables:
        forum: !Ref ForumName
        ddb_table: !Ref PollerTable
        access_token: !Ref AccessToken
        api_key: !Ref APIkey
        api_secret: !Ref APIsecret

Resources:
  PollerFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: disqusPoller/
      Handler: app.lambdaHandler
      Runtime: nodejs12.x
      Policies:
      - DynamoDBCrudPolicy:
          TableName: !Ref PollerTable
      - Statement:
        - Sid: comprehendDetectSentimentPolicy
          Effect: Allow
          Action:
          - comprehend:DetectSentiment
          Resource: '*'
      Events:
        Schedule1:
          Type: Schedule
          Properties:
            Schedule: rate(15 minutes)
      Tags:
        AppName: AWSDeveloperAdvocateSample
  ProcessorFunction:
    Type: AWS::Serverless::Function 
    Properties:
      CodeUri: disqusProcessor/
      Handler: app.lambdaHandler
      Runtime: nodejs12.x
      Policies:
      - DynamoDBCrudPolicy:
          TableName: !Ref PollerTable
      Events:
        DynamoDB1:
          Type: DynamoDB
          Properties:
            Stream:
              'Fn::GetAtt':
                - PollerTable
                - StreamArn
            StartingPosition: TRIM_HORIZON
            BatchSize: 100
      Tags:
        AppName: AWSDeveloperAdvocateSample        
  PollerTable:
    Type: AWS::DynamoDB::Table
    Properties:
      AttributeDefinitions:
      - AttributeName: disqusId
        AttributeType: S
      KeySchema:
      - AttributeName: disqusId
        KeyType: HASH
      BillingMode: PAY_PER_REQUEST
      TimeToLiveSpecification: 
        AttributeName: created
        Enabled: true      
      StreamSpecification:
        StreamViewType: NEW_IMAGE

Outputs:
  PollerFunction:
    Description: "Poller Lambda Function ARN"
    Value: !GetAtt PollerFunction.Arn
  PollerFunctionIamRole:
    Description: "Implicit IAM Role created for Poller function"
    Value: !GetAtt PollerFunctionRole.Arn
  PollerTable:
    Value: !GetAtt PollerTable.Arn
    Description: Table name of the newly created DynamoDB table