# * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# *
# * Permission is hereby granted, free of charge, to any person obtaining a copy of this
# * software and associated documentation files (the "Software"), to deal in the Software
# * without restriction, including without limitation the rights to use, copy, modify,
# * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# * permit persons to whom the Software is furnished to do so.
# *
# * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

AWSTemplateFormatVersion: 2010-09-09
Description: Create KMS Key
Parameters:
  KeyAlies:
    Description: 'KMS Key Alias'
    Type: String
    Default: ''
  Principals:
    Description: 'KMS AWS Comma Delimiter Principals'
    Type: String 

Conditions:
  CreateKeyAlias: !Not [!Equals [!Ref KeyAlies, '']]

Resources:

  KMSPrincipals:
      Type: "Custom::ResourceCompliance"
      Version: "1.0"
      Properties:
        ServiceToken: !Sub 'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:sc-resource-compliance'
        Action:
          Name: principal
          Parameters:
            Principal: !Ref Principals
            Account: !Ref AWS::AccountId
            Type: kms

  KMSKey:
    Type: AWS::KMS::Key
    Properties:
      Description: SC Lab KMS key
      Enabled: 'true'
      EnableKeyRotation: 'false'
      KeyPolicy:
        Version: 2012-10-17
        Id: key-default-1
        Statement:
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !GetAtt KMSPrincipals.Principal         
            Action: 'kms:*'
            Resource: '*'

  KMSAlias:
    Type: AWS::KMS::Alias
    Condition: CreateKeyAlias
    Properties:
      AliasName: !Sub 'alias/${KeyAlies}'
      TargetKeyId: !Ref KMSKey

Outputs:
  KMSId:
    Value: !Ref KMSKey
    Export:
      Name: !Sub ${AWS::StackName}-KMSId
  KMSArn:
    Value: !GetAtt KMSKey.Arn
    Export:
      Name: !Sub ${AWS::StackName}-KMSArn      
  KMSAlias:
    Condition: CreateKeyAlias
    Value: !Ref KMSAlias
    Export:
      Name: !Sub ${AWS::StackName}-KMSAlias