---
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#  Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
#  with the License. A copy of the License is located at
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#      http://www.apache.org/licenses/LICENSE-2.0
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#  or in the 'license' file accompanying this file. This file is distributed on an 'AS IS' BASIS, WITHOUT WARRANTIES
#  OR CONDITIONS OF ANY KIND, express or implied. See the License for the specific language governing permissions
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AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Description: CDF Asset Library History Service

Globals:
  Api:
    OpenApiVersion: 3.0.1

Parameters:
  ApplicationConfigurationOverride:
    Description: This allows you to override any application configuration.  It should consists of a text-based content with a structure and syntax comprising key–value pairs for properties. Any configurations contained in this will override the configurations found and merged from the default .env files.
    Type: String
  Environment:
    Description: Name of environment.  Used to name the created resources.
    Type: String
    MinLength: 1

  TemplateSnippetS3UriBase:
    Description: |
      S3 uri of directory where template snippets are stored for the account.
    Type: String
    MinLength: 1

  AuthType:
    Description: Authorization type to apply to the API gateway endpoints
    Type: String
    Default: None
    AllowedValues:
      - None
      - Private
      - Cognito
      - LambdaRequest
      - LambdaToken
      - ApiKey
      - IAM
    MinLength: 1

  ApiGatewayDefinitionTemplate:
    Description: |
      Name of the API Gateway Cloudformation definition along with the authorization method to use.  Use one of the provided
      templates to implement no auth, private, api key, lambda request, lamdba token, or Cognito auth, or modify one to meet your own
      authentization requirements.  The template must exist within the provided TemplateSnippetS3UriBase location.
    Type: String
    MinLength: 1

  VpcId:
    Description: ID of VPC to deploy the API into. Only required if AuthType = 'Private'.
    Type: String
  CDFSecurityGroupId:
    Description: ID of an existing CDF security group to deploy the API into. Only required if AuthType = 'Private'.
    Type: String
  PrivateSubNetIds:
    Description: Comma delimited list of private subnetIds to deploy the API into. Only required if AuthType = 'Private'.
    Type: CommaDelimitedList
  PrivateApiGatewayVPCEndpoint:
    Description: VPC endpoint. Only required if AuthType = 'Private'.
    Type: String

  CognitoUserPoolArn:
    Description: Cognito user pool arn.  Only required if AuthType is set to 'Cognito'.
    Type: String
    Default: 'N/A'

  AuthorizerFunctionArn:
    Description: Lambda authorizer function arn.  Only required if AuthType is set to 'LambdaRequest' or 'LambdaToken'.
    Type: String
    Default: 'N/A'

  AssetLibraryEventsTopic:
    Description: The AssetLibrary events topic to subscribe to.
    Default: cdf/assetlibrary/events/#
    Type: String
    MinLength: 1

  KmsKeyId:
    Description: The KMS key ID used to encrypt DynamoDB.
    Type: String

  EnableApiGatewayAccessLogs:
    Description: Enales API gateway Access Logging, defaults to false if not specified.
    Type: String
    Default: 'false'
    AllowedValues:
      - 'true'
      - 'false'
    MinLength: 1

Conditions:
  DeployInVPC: !Not [!Equals [!Ref VpcId, 'N/A']]
  DeployWithLambdaAuth:
    !Or [!Equals [!Ref AuthType, 'LambdaRequest'], !Equals [!Ref AuthType, 'LambdaToken']]
  KmsKeyIdProvided: !Not [!Equals [!Ref KmsKeyId, '']]
  EnableApiGatewayAccessLogs: !Equals [!Ref EnableApiGatewayAccessLogs, 'true']

Resources:
  ApiGatewayApi:
    'Fn::Transform':
      Name: 'AWS::Include'
      Parameters:
        Location: !Sub '${TemplateSnippetS3UriBase}${ApiGatewayDefinitionTemplate}'
    DependsOn:
      - RESTLambdaFunction

  ApiGatewayAuthorizerInvokeRole:
    Condition: DeployWithLambdaAuth
    'Fn::Transform':
      Name: 'AWS::Include'
      Parameters:
        Location: !Sub '${TemplateSnippetS3UriBase}cfn-role-lambdaRequestAuthInvokerRole.yaml'
    DependsOn:
      - RESTLambdaFunction

  ApiGatewayAccessLogGroup:
    Condition: EnableApiGatewayAccessLogs
    Type: 'AWS::Logs::LogGroup'
    Properties:
      LogGroupName: !Sub 'cdf-assetLibraryHistory-apigatewayaccesslogs-${Environment}'

  AssetLibraryEventsRule:
    Type: 'AWS::IoT::TopicRule'
    Properties:
      TopicRulePayload:
        Actions:
          - Lambda:
              FunctionArn: !Sub 'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${EventsLambdaFunction}'
        Description: 'Saves AssetLibrary configuration changes'
        AwsIotSqlVersion: '2016-03-23'
        RuleDisabled: 'false'
        Sql: !Sub "SELECT * FROM '${AssetLibraryEventsTopic}'"

  LambdaInvocationPermission:
    Type: AWS::Lambda::Permission
    Properties:
      SourceArn: !Sub 'arn:aws:iot:${AWS::Region}:${AWS::AccountId}:rule/${AssetLibraryEventsRule}'
      Action: lambda:InvokeFunction
      Principal: iot.amazonaws.com
      FunctionName: !GetAtt EventsLambdaFunction.Arn
      SourceAccount: !Ref AWS::AccountId

  LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action: sts:AssumeRole
      Path: '/cdf/assetlibraryhistory/'
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/AWSLambdaExecute
        - !If [KmsKeyIdProvided, !Ref KmsPolicy, !Ref 'AWS::NoValue']
        - arn:aws:iam::aws:policy/AWSXrayWriteOnlyAccess
        - arn:aws:iam::aws:policy/service-role/AWSLambdaVPCAccessExecutionRole
      Policies:
        - PolicyName: 'DynamoDB'
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Action:
                  - 'dynamodb:BatchGetItem'
                  - 'dynamodb:GetItem'
                  - 'dynamodb:Query'
                  - 'dynamodb:Scan'
                  - 'dynamodb:BatchWriteItem'
                  - 'dynamodb:PutItem'
                  - 'dynamodb:UpdateItem'
                  - 'dynamodb:DeleteItem'
                Effect: Allow
                Resource:
                  - !GetAtt HistoryTable.Arn
                  - !Sub '${HistoryTable.Arn}/index/type-time-index'

  RESTLambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action: sts:AssumeRole
      Path: '/cdf/assetlibraryhistory/'
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/AWSLambdaExecute
        - !If [KmsKeyIdProvided, !Ref KmsPolicy, !Ref 'AWS::NoValue']
        - arn:aws:iam::aws:policy/AWSXrayWriteOnlyAccess
        - arn:aws:iam::aws:policy/service-role/AWSLambdaVPCAccessExecutionRole
      Policies:
        - PolicyName: 'DynamoDB'
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Action:
                  - 'dynamodb:BatchGetItem'
                  - 'dynamodb:GetItem'
                  - 'dynamodb:Query'
                  - 'dynamodb:Scan'
                  - 'dynamodb:BatchWriteItem'
                  - 'dynamodb:PutItem'
                  - 'dynamodb:UpdateItem'
                  - 'dynamodb:DeleteItem'
                Effect: Allow
                Resource:
                  - !GetAtt HistoryTable.Arn
                  - !Sub '${HistoryTable.Arn}/index/type-time-index'

  KmsPolicy:
    Type: AWS::IAM::ManagedPolicy
    Condition: KmsKeyIdProvided
    Properties:
      Description: 'cdf-assetlibraryhistory policy for accessing KMS'
      Path: '/cdf/assetlibraryhistory/'
      PolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Action:
              - 'kms:Decrypt'
            Effect: Allow
            Resource: !Sub 'arn:aws:kms:${AWS::Region}:${AWS::AccountId}:key/${KmsKeyId}'

  HistoryTable:
    Type: AWS::DynamoDB::Table
    Metadata:
      cfn_nag:
        rules_to_suppress:
          - id: W28
            reason: 'safely naming this resources to be unique by environment'
          - id: W73
            reason: 'Can be decided by the customer, to specify the billing mode'
    Properties:
      TableName: !Sub 'cdf-assetlibraryhistory-${Environment}'
      PointInTimeRecoverySpecification:
        PointInTimeRecoveryEnabled: true
      SSESpecification:
        Fn::If:
          - KmsKeyIdProvided
          - KMSMasterKeyId: !Ref KmsKeyId
            SSEEnabled: true
            SSEType: KMS
          - Ref: AWS::NoValue
      AttributeDefinitions:
        - AttributeName: 'objectId'
          AttributeType: 'S'
        - AttributeName: 'time'
          AttributeType: 'S'
        - AttributeName: 'type'
          AttributeType: 'S'
      KeySchema:
        - AttributeName: 'objectId'
          KeyType: 'HASH'
        - AttributeName: 'time'
          KeyType: 'RANGE'
      GlobalSecondaryIndexes:
        - IndexName: type-time-index
          KeySchema:
            - AttributeName: 'type'
              KeyType: 'HASH'
            - AttributeName: 'time'
              KeyType: 'RANGE'
          Projection:
            ProjectionType: ALL
          ProvisionedThroughput:
            ReadCapacityUnits: '5'
            WriteCapacityUnits: '5'
      ProvisionedThroughput:
        ReadCapacityUnits: '5'
        WriteCapacityUnits: '5'

  EventsLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: !Sub 'cdf-assetLibraryHistory-events-${Environment}'
      CodeUri: ../bundle.zip
      Handler: lambda_iot_rule.iot_rule_handler
      MemorySize: 512
      Role: !GetAtt LambdaExecutionRole.Arn
      Runtime: nodejs16.x
      Timeout: 30
      Environment:
        Variables:
          APP_CONFIG_DIR: 'config'
          APP_CONFIG: !Ref ApplicationConfigurationOverride
          AWS_DYNAMODB_TABLE_EVENTS: !Ref HistoryTable
      Tracing: Active

  RESTLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: !Sub 'cdf-assetLibraryHistory-rest-${Environment}'
      CodeUri: ../bundle.zip
      Handler: lambda_proxy.handler
      MemorySize: 512
      Role: !GetAtt RESTLambdaExecutionRole.Arn
      Runtime: nodejs16.x
      Timeout: 30
      Environment:
        Variables:
          APP_CONFIG_DIR: 'config'
          APP_CONFIG: !Ref ApplicationConfigurationOverride
          AWS_DYNAMODB_TABLE_EVENTS: !Ref HistoryTable
      Tracing: Active

      VpcConfig:
        Fn::If:
          - DeployInVPC
          - SubnetIds: !Ref PrivateSubNetIds
            SecurityGroupIds:
              - !Ref CDFSecurityGroupId
          - Ref: AWS::NoValue

      Events:
        ProxyApiRoot:
          Type: Api
          Properties:
            RestApiId: !Ref ApiGatewayApi
            Path: /
            Method: ANY
        ProxyApiGreedy:
          Type: Api
          Properties:
            RestApiId: !Ref ApiGatewayApi
            Path: /{proxy+}
            Method: ANY

Outputs:
  RestApiFunctionName:
    Description: Asset Library History REST API lambda function name
    Value: !Ref RESTLambdaFunction
    Export:
      Name: !Sub 'cdf-assetlibraryhistory-${Environment}-restApiFunctionName'
  ApiGatewayUrl:
    Description: Asset Library History REST API URL
    Value: !Sub 'https://${ApiGatewayApi}.execute-api.${AWS::Region}.amazonaws.com/Prod'
    Export:
      Name: !Sub 'cdf-assetlibraryhistory-${Environment}-apigatewayurl'
  ApiGatewayHost:
    Description: Asset Library History REST API host
    Value: !Sub '${ApiGatewayApi}.execute-api.${AWS::Region}.amazonaws.com'
    Export:
      Name: !Sub 'cdf-assetlibraryhistory-${Environment}-apigatewayhost'