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

Resources:
  # EventBridge rules 
  EventRuleAnalyzeText: 
    Type: AWS::Events::Rule
    Properties: 
      Description: "docrepo-analyzers-text"
      State: "ENABLED"
      EventPattern: 
        source: 
          - "docRepo.converters"
        detail-type:
          - "NewTextBatch"
      Targets: 
        - Arn: 
            Fn::GetAtt: 
              - "AnalyzeTextFunction"
              - "Arn"
          Id: "AnalyzeText"            

  EventRuleAnalyzeImage: 
    Type: AWS::Events::Rule
    Properties: 
      Description: "docrepo-analyzers-image"
      State: "ENABLED"
      EventPattern: 
        source: 
          - "docRepo.s3"
        detail-type:
          - PutObject
        detail: 
          type: 
            - "jpg"
            - "jpeg"
      Targets: 
        - Arn: 
            Fn::GetAtt: 
              - "AnalyzeImageFunction"
              - "Arn"
          Id: "AnalyzeImage"    

  # EventBridge permissions to invoke Lambda functions
  PermissionForEventsToInvokeLambda1: 
    Type: AWS::Lambda::Permission
    Properties: 
      FunctionName: 
        Ref: "AnalyzeTextFunction"
      Action: "lambda:InvokeFunction"
      Principal: "events.amazonaws.com"
      SourceArn: 
        Fn::GetAtt: 
          - "EventRuleAnalyzeText"
          - "Arn"

  PermissionForEventsToInvokeLambda2: 
    Type: AWS::Lambda::Permission
    Properties: 
      FunctionName: 
        Ref: "AnalyzeImageFunction"
      Action: "lambda:InvokeFunction"
      Principal: "events.amazonaws.com"
      SourceArn: 
        Fn::GetAtt: 
          - "EventRuleAnalyzeImage"
          - "Arn"          

  # Lambda functions
  AnalyzeTextFunction:
    Type: AWS::Serverless::Function 
    Properties:
      CodeUri: analyzeText/
      Handler: app.handler
      Runtime: nodejs12.x
      Timeout: 15
      MemorySize: 512
      Environment:
        Variables:
          language: 'en'
      Policies:
        - Statement:
          - Effect: Allow
            Resource: '*'
            Action:
              - events:PutEvents
        - Statement:
          - Effect: Allow
            Resource: '*'
            Action:
              - comprehend:*              

  AnalyzeImageFunction:
    Type: AWS::Serverless::Function 
    Properties:
      CodeUri: analyzeImage/
      Handler: app.handler
      Runtime: nodejs12.x
      Timeout: 15
      MemorySize: 512
      Environment:
        Variables:
          MaxLabels: 5
          MinConfidence: 70
      Policies:
        - !Sub 'arn:aws:iam::${AWS::AccountId}:policy/docrepo-s3-read-policy'
        - Statement:
          - Effect: Allow
            Resource: '*'
            Action:
              - events:PutEvents
        - Statement:
          - Effect: Allow
            Resource: '*'
            Action:
              - rekognition:*