AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  getting-started-with-rpa

  This template creates a workflow that leverages AWS Step Functions, 
  AWS Lambda, and Amazon Textract to get started with Robotic Process 
  Automation (RPA), which is the use of software with artificial 
  intelligence (AI) to handle high-volume, repeatable tasks that 
  previously required humans to perform.

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 3

Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: "Amazon DynamoDB Configuration"
        Parameters:
          - InvoicesTableNameSuffix
          - ReadCapacityUnits
          - WriteCapacityUnits
      - Label:
          default: "Amazon S3 Bucket Name Prefixes"
        Parameters:
          - ScannedInvoicesBucketNamePrefix
          - InvoiceAnalysesBucketNamePrefix
          - ProcessedInvoicesBucketNamePrefix
    ParameterLabels:
      InvoicesTableNameSuffix:
        default: Invoices Table Name Suffix
      ReadCapacityUnits:
        default: Read Capacity Units
      WriteCapacityUnits:
        default: Write Capacity Units
      ScannedInvoicesBucketNamePrefix:
        default: Scanned Invoices Bucket Name Prefix
      InvoiceAnalysesBucketNamePrefix:
        default: Invoice Analyses Bucket Name Prefix
      ProcessedInvoicesBucketNamePrefix:
        default: Processed Invoices Bucket Name Prefix

Parameters:
  InvoicesTableNameSuffix:
    Type: String
    Default: "invoices"
    Description: > 
      The suffix of the name of the Amazon DynamoDB table where processed invoices 
      will be stored. The table name will be prefixed by the Stack Name.
  ReadCapacityUnits:
    Description: Provisioned read throughput
    Type: Number
    Default: 5
    MinValue: 5
    MaxValue: 10000
    ConstraintDescription: must be between 5 and 10000
  WriteCapacityUnits:
    Description: Provisioned write throughput
    Type: Number
    Default: 5
    MinValue: 5
    MaxValue: 10000
    ConstraintDescription: must be between 5 and 10000
  ScannedInvoicesBucketNamePrefix:
    Type: String
    Default: "scanned-invoices"
    Description: > 
      The prefix of the name of the S3 bucket where scanned invoices will be stored. 
      The bucket name will be suffixed by Account ID to avoid global S3 bucket name 
      collisions.
  InvoiceAnalysesBucketNamePrefix:
    Type: String
    Default: "invoice-analyses"
    Description: >
      The prefix of the name of the S3 bucket where invoice analyses will be stored.
      The bucket name will be suffixed by Account ID to avoid global S3 bucket name 
      collisions.
  ProcessedInvoicesBucketNamePrefix:
    Type: String
    Default: "processed-invoices"
    Description: > 
      The prefix of the name of the S3 bucket where processed invoices will be stored. 
      The bucket name will be suffixed by Account ID to avoid global S3 bucket name 
      collisions.

Resources:
  InvoicesTable:
    Type: AWS::DynamoDB::Table
    Properties:
      AttributeDefinitions:
        - AttributeName: invoice_id
          AttributeType: S
        - AttributeName: payee_name
          AttributeType: S
        - AttributeName: due_date
          AttributeType: S
      GlobalSecondaryIndexes:
        - IndexName: payee_name_index
          KeySchema:
            - AttributeName: payee_name
              KeyType: HASH
          Projection:
            ProjectionType: KEYS_ONLY   
          ProvisionedThroughput:
            ReadCapacityUnits: !Ref ReadCapacityUnits
            WriteCapacityUnits: !Ref WriteCapacityUnits
        - IndexName: due_date_index
          KeySchema:
            - AttributeName: due_date
              KeyType: HASH
          Projection:
            ProjectionType: KEYS_ONLY   
          ProvisionedThroughput:
            ReadCapacityUnits: !Ref ReadCapacityUnits
            WriteCapacityUnits: !Ref WriteCapacityUnits
      KeySchema:
        - AttributeName: invoice_id
          KeyType: HASH
      ProvisionedThroughput:
        ReadCapacityUnits: !Ref ReadCapacityUnits
        WriteCapacityUnits: !Ref WriteCapacityUnits
      TableName: 
        !Sub
          - ${AWS::StackName}-${TableNameSuffix}
          - { TableNameSuffix: !Ref InvoicesTableNameSuffix }
  ScannedInvoicesBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: 
        !Sub
          - ${BucketNamePrefix}-${AWS::AccountId}
          - { BucketNamePrefix: !Ref ScannedInvoicesBucketNamePrefix }
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: 'aws:kms'
              KMSMasterKeyID: alias/aws/s3
      VersioningConfiguration:
        Status: Enabled
  InvoiceAnalysesBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: 
        !Sub
          - ${BucketNamePrefix}-${AWS::AccountId}
          - { BucketNamePrefix: !Ref InvoiceAnalysesBucketNamePrefix }
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: 'aws:kms'
              KMSMasterKeyID: alias/aws/s3
      VersioningConfiguration:
        Status: Enabled
  ProcessedInvoicesBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: 
        !Sub
          - ${BucketNamePrefix}-${AWS::AccountId}
          - { BucketNamePrefix: !Ref ProcessedInvoicesBucketNamePrefix }
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: 'aws:kms'
              KMSMasterKeyID: alias/aws/s3
      VersioningConfiguration:
        Status: Enabled
  StartProcessScannedInvoiceWorkflowFunctionLambdaExecutionRole: 
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement: 
          - Effect: Allow
            Principal: 
              Service: 
                - lambda.amazonaws.com
            Action: 
              - sts:AssumeRole
      Path: /
      Policies:
        - PolicyName: lambda_basic_execution
          PolicyDocument:
            Version: 2012-10-17
            Statement: 
              - Effect: Allow
                Action: 
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource:
                  !Sub
                    - arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/${AWS::StackName}-${LambdaFunctionName}:*
                    - { LambdaFunctionName: StartProcessScannedInvoiceWorkflow }
        - PolicyName: sqs
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - sqs:DeleteMessage
                  - sqs:GetQueueAttributes
                  - sqs:ReceiveMessage
                Resource: 
                  !Sub
                    - arn:aws:sqs:${AWS::Region}:${AWS::AccountId}:${AWS::StackName}-${QueueName}
                    - { QueueName: DocumentAnalysisCompletedQueue }
        - PolicyName: step_functions
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - states:StartExecution
                Resource: "*"
        - PolicyName: kms
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - kms:Decrypt
                Resource: "*" 
      RoleName:
        !Sub
          - ${AWS::StackName}-${ExecutionRoleName}
          - { ExecutionRoleName: StartProcessScannedInvoiceWorkflowRole }
  StartProcessScannedInvoiceWorkflowFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: start_process_scanned_invoice_workflow/
      Environment:
        Variables:
          STATE_MACHINE_ARN: 
            !Sub 
              - arn:aws:states:${AWS::Region}:${AWS::AccountId}:stateMachine:${AWS::StackName}-${StateMachineName}
              - { StateMachineName: ProcessScannedInvoiceWorkflow }
      Events:
        SQSEvent:
          Type: SQS
          Properties:
            Queue:
              !Sub ${DocumentAnalysisCompletedQueue.Arn}
      FunctionName: 
        !Sub
          - ${AWS::StackName}-${LambdaFunctionName}
          - { LambdaFunctionName: StartProcessScannedInvoiceWorkflow }
      Handler: app.lambda_handler
      Role: 
        !GetAtt
          - StartProcessScannedInvoiceWorkflowFunctionLambdaExecutionRole
          - Arn
      MemorySize: 128        
      Runtime: python3.7
      Timeout: 30
  StartProcessScannedInvoiceWorkflowFunctionLogGroup:
      Type: AWS::Logs::LogGroup
      Properties:
        LogGroupName: 
          !Sub
            - /aws/lambda/${AWS::StackName}-${LambdaFunctionName}
            - LambdaFunctionName: StartProcessScannedInvoiceWorkflow
        RetentionInDays: 7
  StartDocumentAnalysisFunctionLambdaExecutionRole: 
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement: 
          - Effect: Allow
            Principal: 
              Service: 
                - lambda.amazonaws.com
            Action: 
              - sts:AssumeRole
      Path: /
      Policies:
        - PolicyName: lambda_basic_execution
          PolicyDocument:
            Version: 2012-10-17
            Statement: 
              - Effect: Allow
                Action: 
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource:
                  !Sub
                    - arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/${AWS::StackName}-${LambdaFunctionName}:*
                    - { LambdaFunctionName: StartDocumentAnalysis }
        - PolicyName: s3
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - s3:GetObject
                Resource:
                  !Sub
                    - arn:aws:s3:::${BucketNamePrefix}-${AWS::AccountId}/*
                    - { BucketNamePrefix: !Ref ScannedInvoicesBucketNamePrefix }
        - PolicyName: textract
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - textract:StartDocumentAnalysis
                Resource: "*"
      RoleName:
        !Sub
          - ${AWS::StackName}-${ExecutionRoleName}
          - { ExecutionRoleName: StartDocumentAnalysisRole }
  DocumentAnalysisCompletedTopic:
    Type: AWS::SNS::Topic
    Properties:
      KmsMasterKeyId: !Ref Key
      TopicName:
        !Sub
          - ${AWS::StackName}-${TopicName}
          - { TopicName: DocumentAnalysisCompleted }
  DocumentAnalysisCompletedQueue:
    Type: AWS::SQS::Queue
    Properties:
      DelaySeconds: 60
      KmsMasterKeyId: !Ref Key
      QueueName:
        !Sub
          - ${AWS::StackName}-${QueueName}
          - { QueueName: DocumentAnalysisCompletedQueue }
      ReceiveMessageWaitTimeSeconds: 20
      VisibilityTimeout: 60
  DocumentAnalysisCompletedQueuePolicy: 
    Type: AWS::SQS::QueuePolicy
    Properties:
      PolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal: 
              Service: sns.amazonaws.com
            Action:
              - sqs:SendMessage
            Resource: 
              !Sub
                - arn:aws:sqs:${AWS::Region}:${AWS::AccountId}:${AWS::StackName}-${QueueName}
                - { QueueName: DocumentAnalysisCompletedQueue }
      Queues:
        - !Ref DocumentAnalysisCompletedQueue
  DocumentAnalysisCompletedSNSSubscription:
    Type: AWS::SNS::Subscription
    Properties:
      Protocol: sqs
      Endpoint: !GetAtt DocumentAnalysisCompletedQueue.Arn
      TopicArn: !Ref DocumentAnalysisCompletedTopic
  TextractPublishToSNSTopicRole: 
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement: 
          - Effect: Allow
            Principal: 
              Service: 
                - textract.amazonaws.com
            Action: 
              - sts:AssumeRole
      Path: /
      Policies:
        - PolicyName: sns
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - sns:Publish
                Resource: 
                  !Sub
                    - arn:aws:sns:${AWS::Region}:${AWS::AccountId}:${AWS::StackName}-${TopicName}
                    - { TopicName: DocumentAnalysisCompleted }
        - PolicyName: kms
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - kms:GenerateDataKey*
                  - kms:Decrypt
                Resource: "*" 
      RoleName:
        !Sub
          - ${AWS::StackName}-${RoleName}
          - { RoleName: TextractPublishToSNSTopicRole }
  StartDocumentAnalysisFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: start_document_analysis/
      Environment:
        Variables:
          DOCUMENT_ANALYIS_COMPLETED_SNS_TOPIC_ARN:
            !Sub
              - arn:aws:sns:${AWS::Region}:${AWS::AccountId}:${AWS::StackName}-${TopicName}
              - { TopicName: DocumentAnalysisCompleted }
          TEXTRACT_PUBLISH_TO_SNS_ROLE_ARN:
            !Sub
              - arn:aws:iam::${AWS::AccountId}:role/${AWS::StackName}-${RoleName}
              - { RoleName: TextractPublishToSNSTopicRole }
      Events:
        S3Event:
          Type: S3
          Properties:
            Bucket: !Ref ScannedInvoicesBucket
            Events: s3:ObjectCreated:*
      FunctionName:  
        !Sub
          - ${AWS::StackName}-${LambdaFunctionName}
          - { LambdaFunctionName: StartDocumentAnalysis }
      Handler: app.lambda_handler
      Role: 
        !GetAtt
          - StartDocumentAnalysisFunctionLambdaExecutionRole
          - Arn
      MemorySize: 128        
      Runtime: python3.7
      Timeout: 30
  StartDocumentAnalysisFunctionLogGroup:
      Type: AWS::Logs::LogGroup
      Properties:
        LogGroupName: 
          !Sub
            - /aws/lambda/${AWS::StackName}-${LambdaFunctionName}
            - LambdaFunctionName: StartDocumentAnalysis
        RetentionInDays: 7
  SaveDocumentAnalysisFunctionLambdaExecutionRole: 
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement: 
          - Effect: Allow
            Principal: 
              Service: 
                - lambda.amazonaws.com
            Action: 
              - sts:AssumeRole
      Path: /
      Policies:
        - PolicyName: lambda_basic_execution
          PolicyDocument:
            Version: 2012-10-17
            Statement: 
              - Effect: Allow
                Action: 
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource:
                  !Sub
                    - arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/${AWS::StackName}-${LambdaFunctionName}:*
                    - { LambdaFunctionName: SaveDocumentAnalysis }
        - PolicyName: textract
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - textract:GetDocumentAnalysis
                Resource: "*"
        - PolicyName: s3
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - s3:PutObject
                Resource:
                  !Sub
                    - arn:aws:s3:::${BucketNamePrefix}-${AWS::AccountId}/*
                    - { BucketNamePrefix: !Ref InvoiceAnalysesBucketNamePrefix }
      RoleName:
        !Sub
          - ${AWS::StackName}-${ExecutionRoleName}
          - { ExecutionRoleName: SaveDocumentAnalysisRole }
  SaveDocumentAnalysisFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: save_document_analysis/
      Environment:
        Variables:
          ANALYSES_BUCKET_NAME:
            !Sub
              - ${BucketNamePrefix}-${AWS::AccountId}
              - { BucketNamePrefix: !Ref InvoiceAnalysesBucketNamePrefix }
      FunctionName:  
        !Sub
          - ${AWS::StackName}-${LambdaFunctionName}
          - { LambdaFunctionName: SaveDocumentAnalysis }
      Handler: app.lambda_handler
      Role: 
        !GetAtt
          - SaveDocumentAnalysisFunctionLambdaExecutionRole
          - Arn
      MemorySize: 128        
      Runtime: python3.7
      Timeout: 30
  SaveDocumentAnalysisFunctionLogGroup:
      Type: AWS::Logs::LogGroup
      Properties:
        LogGroupName: 
          !Sub
            - /aws/lambda/${AWS::StackName}-${LambdaFunctionName}
            - LambdaFunctionName: SaveDocumentAnalysis
        RetentionInDays: 7
  PendingReviewTopic:
    Type: AWS::SNS::Topic
    Properties:
      KmsMasterKeyId: !Ref Key
      TopicName:
        !Sub
          - ${AWS::StackName}-${TopicName}
          - { TopicName: PendingReview }
  ProcessDocumentAnalysisFunctionLambdaExecutionRole: 
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement: 
          - Effect: Allow
            Principal: 
              Service: 
                - lambda.amazonaws.com
            Action: 
              - sts:AssumeRole
      Path: /
      Policies:
        - PolicyName: lambda_basic_execution
          PolicyDocument:
            Version: 2012-10-17
            Statement: 
              - Effect: Allow
                Action: 
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource:
                  !Sub
                    - arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/${AWS::StackName}-${LambdaFunctionName}:*
                    - { LambdaFunctionName: ProcessDocumentAnalysis }
        - PolicyName: dynamodb
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - dynamodb:PutItem
                Resource:
                  !Sub
                    - arn:aws:dynamodb:${AWS::Region}:${AWS::AccountId}:table/${AWS::StackName}-${TableNameSuffix}
                    - { TableNameSuffix: !Ref InvoicesTableNameSuffix }
        - PolicyName: s3
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - s3:GetObject
                Resource:
                  !Sub
                    - arn:aws:s3:::${BucketNamePrefix}-${AWS::AccountId}/*
                    - { BucketNamePrefix: !Ref InvoiceAnalysesBucketNamePrefix }
              - Effect: Allow
                Action:
                  - s3:PutObject
                Resource:
                  !Sub
                    - arn:aws:s3:::${BucketNamePrefix}-${AWS::AccountId}/*
                    - { BucketNamePrefix: !Ref ProcessedInvoicesBucketNamePrefix }
      RoleName:
        !Sub
          - ${AWS::StackName}-${ExecutionRoleName}
          - { ExecutionRoleName: ProcessDocumentAnalysisRole }
  ProcessDocumentAnalysisFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: process_document_analysis/
      Environment:
        Variables:
          INVOICES_TABLE_NAME:
            !Sub
              - ${AWS::StackName}-${TableNameSuffix}
              - { TableNameSuffix: !Ref InvoicesTableNameSuffix }
      FunctionName:  
        !Sub
          - ${AWS::StackName}-${LambdaFunctionName}
          - { LambdaFunctionName: ProcessDocumentAnalysis }
      Handler: app.lambda_handler
      Role: 
        !GetAtt
          - ProcessDocumentAnalysisFunctionLambdaExecutionRole
          - Arn
      MemorySize: 128        
      Runtime: python3.7
      Timeout: 30
  ProcessDocumentAnalysisFunctionLogGroup:
      Type: AWS::Logs::LogGroup
      Properties:
        LogGroupName: 
          !Sub
            - /aws/lambda/${AWS::StackName}-${LambdaFunctionName}
            - LambdaFunctionName: ProcessDocumentAnalysis
        RetentionInDays: 7
  ArchiveDocumentFunctionLambdaExecutionRole: 
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement: 
          - Effect: Allow
            Principal: 
              Service: 
                - lambda.amazonaws.com
            Action: 
              - sts:AssumeRole
      Path: /
      Policies:
        - PolicyName: lambda_basic_execution
          PolicyDocument:
            Version: 2012-10-17
            Statement: 
              - Effect: Allow
                Action: 
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource:
                  !Sub
                    - arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/${AWS::StackName}-${LambdaFunctionName}:*
                    - { LambdaFunctionName: ArchiveDocument }
        - PolicyName: s3
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - s3:GetObject
                  - s3:GetObjectTagging
                Resource:
                  !Sub
                    - arn:aws:s3:::${BucketNamePrefix}-${AWS::AccountId}/*
                    - { BucketNamePrefix: !Ref ScannedInvoicesBucketNamePrefix }
              - Effect: Allow
                Action:
                  - s3:PutObject
                  - s3:PutObjectTagging
                Resource:
                  !Sub
                    - arn:aws:s3:::${BucketNamePrefix}-${AWS::AccountId}/*
                    - { BucketNamePrefix: !Ref ProcessedInvoicesBucketNamePrefix }
              - Effect: Allow
                Action:
                  - s3:DeleteObject
                Resource:
                  !Sub
                    - arn:aws:s3:::${BucketNamePrefix}-${AWS::AccountId}/*
                    - { BucketNamePrefix: !Ref ScannedInvoicesBucketNamePrefix }
      RoleName:
        !Sub
          - ${AWS::StackName}-${ExecutionRoleName}
          - { ExecutionRoleName: ArchiveDocumentRole }
  ArchiveDocumentFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: archive_document/
      Environment:
        Variables:
          ARCHIVE_BUCKET_NAME:
            !Sub
              - ${BucketNamePrefix}-${AWS::AccountId}
              - { BucketNamePrefix: !Ref ProcessedInvoicesBucketNamePrefix }
      FunctionName:  
        !Sub
          - ${AWS::StackName}-${LambdaFunctionName}
          - { LambdaFunctionName: ArchiveDocument }
      Handler: app.lambda_handler
      Role: 
        !GetAtt
          - ArchiveDocumentFunctionLambdaExecutionRole
          - Arn
      MemorySize: 128        
      Runtime: python3.7
      Timeout: 30
  ArchiveDocumentFunctionLogGroup:
      Type: AWS::Logs::LogGroup
      Properties:
        LogGroupName: 
          !Sub
            - /aws/lambda/${AWS::StackName}-${LambdaFunctionName}
            - LambdaFunctionName: ArchiveDocument
        RetentionInDays: 7
  ProcessScannedInvoiceWorkflowStateMachineStatesExecutionRole: 
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement: 
          - Effect: Allow
            Principal: 
              Service: 
                - states.amazonaws.com
            Action: 
              - sts:AssumeRole
      Path: /
      Policies:
        - PolicyName: lambda_invoke
          PolicyDocument:
            Version: 2012-10-17
            Statement: 
              - Effect: Allow
                Action: 
                  - lambda:InvokeFunction
                Resource: 
                  - !Sub
                      - arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${AWS::StackName}-${LambdaFunctionName}
                      - { LambdaFunctionName: StartProcessScannedInvoiceWorkflow }
                  - !Sub
                      - arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${AWS::StackName}-${LambdaFunctionName}
                      - { LambdaFunctionName: StartDocumentAnalysis }
                  - !Sub
                      - arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${AWS::StackName}-${LambdaFunctionName}
                      - { LambdaFunctionName: GetDocumentAnalysisStatus }
                  - !Sub
                      - arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${AWS::StackName}-${LambdaFunctionName}
                      - { LambdaFunctionName: SaveDocumentAnalysis }
                  - !Sub
                      - arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${AWS::StackName}-${LambdaFunctionName}
                      - { LambdaFunctionName: ProcessDocumentAnalysis }
                  - !Sub
                      - arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${AWS::StackName}-${LambdaFunctionName}
                      - { LambdaFunctionName: ArchiveDocument }
        - PolicyName: sns
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - sns:Publish
                Resource: 
                  !Sub
                    - arn:aws:sns:${AWS::Region}:${AWS::AccountId}:${AWS::StackName}-${TopicName}
                    - { TopicName: PendingReview }
        - PolicyName: kms
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - kms:GenerateDataKey*
                  - kms:Decrypt
                Resource: "*" 
      RoleName:
        !Sub
          - ${AWS::StackName}-${ExecutionRoleName}
          - { ExecutionRoleName: ProcessScannedInvoiceWorkflowRole }
  ProcessScannedInvoiceWorkflowStateMachine:
    Type: AWS::Serverless::StateMachine
    Properties:
      DefinitionSubstitutions:
        StartDocumentAnalysisLambdaArn: !GetAtt [ StartDocumentAnalysisFunction, Arn ]
        SaveDocumentAnalysisLambdaArn: !GetAtt [ SaveDocumentAnalysisFunction, Arn ]
        PendingReviewTopicArn: !Ref PendingReviewTopic
        ProcessDocumentAnalysisLambdaArn: !GetAtt [ ProcessDocumentAnalysisFunction, Arn ]
        ArchiveDocumentLambdaArn: !GetAtt [ ArchiveDocumentFunction, Arn ]
      DefinitionUri: state_machine/process_scanned_invoice_workflow.asl.json
      Role: !GetAtt [ ProcessScannedInvoiceWorkflowStateMachineStatesExecutionRole, Arn ]
      Name: 
        !Sub
          - ${AWS::StackName}-${LambdaFunctionName}
          - { LambdaFunctionName: ProcessScannedInvoiceWorkflow }
  Key:
    Type: 'AWS::KMS::Key'
    Properties:
      KeyPolicy:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            AWS: !Sub 'arn:aws:iam::${AWS::AccountId}:root'
          Action: 'kms:*'
          Resource: '*'
        - Effect: Allow
          Principal:
            Service: !Sub 'textract.amazonaws.com'
          Action:
            - kms:GenerateDataKey*
            - kms:Decrypt
          Resource: '*'
        - Effect: Allow
          Principal:
            Service: !Sub 'sns.amazonaws.com'
          Action:
            - kms:GenerateDataKey*
            - kms:Decrypt
          Resource: '*'
  KeyAlias:
    Type: 'AWS::KMS::Alias'
    Properties:
      AliasName: !Sub 'alias/${AWS::StackName}-Key'
      TargetKeyId: !Ref Key

Outputs:
  ScannedInvoicesBucketName:
      Value: 
        !Ref ScannedInvoicesBucket
  InvoiceAnalysesBucketName:
      Value: 
        !Ref InvoiceAnalysesBucket
  ProcessedInvoicesBucketName:
      Value: 
        !Ref ProcessedInvoicesBucket