AWSTemplateFormatVersion: '2010-09-09'
Description: Configure CloudCustodian CodeBuild Role for deploying policies and Pipeline CodeCommit Repository
Metadata:
  LICENSE: >-
    Copyright 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,
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    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
Parameters:
  pCloudCustodianAdminRoleName:
    Type: String
    Default: CloudCustodianAdminRole
    Description: Name for CloudCustodian Admin Role to be used by CloudCustodian CodeBuild Project in Admin Account to deploy policies accross all accounts
  pCloudCustodianDeploymentRoleName:
    Type: String
    Default: CloudCustodianDeploymentRole
    Description: Name for CloudCustodian Cross Account Role in Child Accounts for deploying policies
  pCloudCustodianPipelineServiceRoleName:
    Type: String
    Default: CloudCustodianCodePipelineRole
    Description: Name for CloudCustodian CodePipeline Service Role
  pCodeCommitRepoName:
    Type: String
    Default: CloudCustodianCodeCommitRepo
    Description: Name for the source CodeCommit Repository

Resources:
  rCloudCustodianPipelineArtifactS3Bucket: #pipeline artifact S3 bucket store
    Type: 'AWS::S3::Bucket'
    Properties:
      BucketName: !Sub "cloudcustodian-pipeline-${AWS::AccountId}"
      VersioningConfiguration:
        Status: Enabled
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: 'aws:kms'

  rCloudCustodianCodeCommit:
    Type: AWS::CodeCommit::Repository
    Properties:
      RepositoryName: !Ref pCodeCommitRepoName
  
  rCloudCustodianCodeBuild: #pipeline codebuild project
    Type: AWS::CodeBuild::Project
    Properties:
      Name: CloudCustodianCodeBuild
      Description: This project will be used in a CICD Pipeline for deploying cloud custodian policies accross Organization Accounts
      ServiceRole: !Ref rCloudCustodianCodeBuildRole
      Artifacts:
        Type: CODEPIPELINE
      Environment:
        Type: LINUX_CONTAINER
        ComputeType: BUILD_GENERAL1_SMALL
        Image: aws/codebuild/standard:4.0
        PrivilegedMode: true
        EnvironmentVariables:
          - Name: CLOUD_CUSTODIAN_ROLE
            Value: !Ref pCloudCustodianDeploymentRoleName
          - Name: MANAGEMENT_ACCOUNT_ID
            Value: !Ref AWS::AccountId
      Source:
        Type: CODEPIPELINE
        BuildSpec: buildspec.yaml
      TimeoutInMinutes: 60
  
  rCloudCustodianCodeBuildRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Ref pCloudCustodianAdminRoleName
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: "Allow"
            Principal:
              Service:
                - codebuild.amazonaws.com
            Action:
              - "sts:AssumeRole"
      Policies:
        - PolicyName: "CloudCustodian-CodeBuild-Policy"
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action:
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource:
                  - !Sub arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/codebuild/*
              - Effect: Allow 
                Action:
                  - 's3:GetObject'
                  - 's3:PutObject'
                Resource:
                  - !Sub arn:aws:s3:::${rCloudCustodianPipelineArtifactS3Bucket}
                  - !Sub arn:aws:s3:::${rCloudCustodianPipelineArtifactS3Bucket}/*
              - Effect: Allow
                Action:
                  - sts:AssumeRole
                Resource:
                  - !Sub arn:${AWS::Partition}:iam::*:role/${pCloudCustodianDeploymentRoleName}
              - Effect: Allow
                Action:
                  - organizations:ListRoots
                  - organizations:ListOrganizationalUnitsForParent
                  - organizations:ListAccountsForParent
                  - organizations:ListTagsForResource
                Resource: "*"
  
  rCloudCustodianCodePipelineRole: #Codepipeline service role
    Type: 'AWS::IAM::Role'
    Properties:
      RoleName: !Ref pCloudCustodianPipelineServiceRoleName
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - codepipeline.amazonaws.com
            Action:
              - 'sts:AssumeRole'
      Policies:
        - PolicyName: Codepipeline-Role-Policy
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow 
                Action:
                  - 's3:GetObject'
                  - 's3:PutObject'
                  - 's3:GetObjectVersion'
                  - 's3:GetBucketVersioning'
                Resource:
                  - !Sub arn:aws:s3:::${rCloudCustodianPipelineArtifactS3Bucket}
                  - !Sub arn:aws:s3:::${rCloudCustodianPipelineArtifactS3Bucket}/*
              - Effect: Allow
                Action:
                  - codecommit:CancelUploadArchive
                  - codecommit:GetBranch
                  - codecommit:GetCommit
                  - codecommit:GetUploadArchiveStatus
                  - codecommit:UploadArchive
                Resource: !Sub arn:aws:codecommit:${AWS::Region}:${AWS::AccountId}:${pCodeCommitRepoName}
              - Effect: Allow
                Action:
                  - 'codebuild:BatchGetBuilds'
                  - 'codebuild:StartBuild'
                Resource: !GetAtt rCloudCustodianCodeBuild.Arn
Outputs:
  oCloudCustodianAdminRoleArn:
    Description: Arn of the CloudCustodian Admin Role which will be used by CodeBuild
    Value: !GetAtt rCloudCustodianCodeBuildRole.Arn
  oCloudCustodianDeploymentRoleName:
    Description: Name of the CloudCustodian Role to be deployed to all member accounts
    Value: !Ref pCloudCustodianDeploymentRoleName
  oCloudCustodianPipelineRoleArn:
    Description: Arn of the CloudCustodian Pipeline Service Role which will be used by CodePipeline
    Value: !GetAtt rCloudCustodianCodePipelineRole.Arn
  oCloudCustodianPipelineArtifactStore:
    Description: Artifact Store S3 Bucket for the CloudCustodian Pipeline
    Value: !Ref rCloudCustodianPipelineArtifactS3Bucket
  oCloudCustodianCodeBuildProject:
    Description: Name of CloudCustodian CodeBuild Project
    Value: !Ref rCloudCustodianCodeBuild 
  oCloudCustodianCodeCommitName:
    Description: Pipeline Source CodeCommit Repository Name
    Value: !GetAtt rCloudCustodianCodeCommit.Name
  oCloudCustodianCodeCommitCloneUrlHttp:
    Description: Pipeline Source CodeCommit Repository HTTP Clone URL
    Value: !GetAtt rCloudCustodianCodeCommit.CloneUrlHttp