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AWSTemplateFormatVersion: '2010-09-09'
Description: 'CloudFront Distribution for custom domain configuration with existing AWS WorkSpaces Secure Browser Portal'

Parameters:
  PortalEndpoint:
    Type: String
    Description: 'The endpoint of your existing WorkSpaces Web Portal (e.g., abc123.workspaces-web.com)'
    AllowedPattern: '^[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)?\.workspaces-web\.com$'
    ConstraintDescription: 'Must be a valid WorkSpaces Web portal endpoint'
  
  CustomDomainName:
    Type: String
    Description: 'Custom domain name for the portal (e.g., myportal.example.com)'
    AllowedPattern: '^([a-zA-Z0-9]?((?!-)([A-Za-z0-9-]*[A-Za-z0-9])\.)+[a-zA-Z0-9]+)$'
    ConstraintDescription: 'Must be a valid domain name'
  
  CertificateArn:
    Type: String
    Description: 'ARN of the validated SSL certificate in ACM (must be in us-east-1 region for CloudFront)'
    AllowedPattern: 'arn:aws:acm:us-east-1:[0-9]{12}:certificate/[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}'
    ConstraintDescription: 'Must be a valid ACM certificate ARN in us-east-1 region'
  
  CreateRoute53Record:
    Type: String
    Description: 'Create Route53 record for custom domain (requires existing hosted zone)'
    Default: 'No'
    AllowedValues:
      - 'Yes'
      - 'No'
  
  HostedZoneId:
    Type: String
    Description: 'Route53 Hosted Zone ID for the custom domain (required if creating Route53 record)'
    Default: ''

Conditions:
  ShouldCreateRoute53Record: !And
    - !Equals [!Ref CreateRoute53Record, 'Yes']
    - !Not [!Equals [!Ref HostedZoneId, '']]

Resources:
  # CloudFront Distribution
  CloudFrontDistribution:
    Type: AWS::CloudFront::Distribution
    Properties:
      DistributionConfig:
        Aliases:
          - !Ref CustomDomainName
        Comment: !Sub 'CloudFront distribution for WorkSpaces Web Portal - ${CustomDomainName}'
        Enabled: true
        HttpVersion: http2
        IPV6Enabled: false  # WorkSpaces Secure Browser does not support IPv6
        PriceClass: PriceClass_All
        
        # Origin Configuration
        Origins:
          - Id: WorkSpacesWebOrigin
            DomainName: !Ref PortalEndpoint
            CustomOriginConfig:
              HTTPSPort: 443
              OriginProtocolPolicy: https-only
              OriginSSLProtocols:
                - TLSv1.2
            OriginCustomHeaders:
              - HeaderName: workspacessecurebrowser-custom-domain
                HeaderValue: !Ref CustomDomainName
        
        # Default Cache Behavior
        DefaultCacheBehavior:
          TargetOriginId: WorkSpacesWebOrigin
          ViewerProtocolPolicy: https-only
          AllowedMethods:
            - GET
            - HEAD
            - OPTIONS
            - PUT
            - POST
            - PATCH
            - DELETE
          Compress: false
          # Cache Policy: CachingDisabled (using predefined managed policy)
          CachePolicyId: 4135ea2d-6df8-44a3-9df3-4b5a84be39ad
          # Origin Request Policy: AllViewerExceptHostHeader (using predefined managed policy)
          OriginRequestPolicyId: b689b0a8-53d0-40ab-baf2-68738e2966ac
        
        # SSL Configuration
        ViewerCertificate:
          AcmCertificateArn: !Ref CertificateArn
          SslSupportMethod: sni-only
          MinimumProtocolVersion: TLSv1.2_2021
      
      Tags:
        - Key: Name
          Value: !Sub '${AWS::StackName}-cloudfront'

  # Route 53 Record (optional - requires hosted zone to exist)
  Route53Record:
    Type: AWS::Route53::RecordSet
    Condition: ShouldCreateRoute53Record
    Properties:
      HostedZoneId: !Ref HostedZoneId
      Name: !Ref CustomDomainName
      Type: A
      AliasTarget:
        DNSName: !GetAtt CloudFrontDistribution.DomainName
        HostedZoneId: Z2FDTNDATAQYW2  # CloudFront Hosted Zone ID
        EvaluateTargetHealth: false

Outputs:
  PortalEndpoint:
    Description: 'WorkSpaces Web Portal endpoint used as origin'
    Value: !Ref PortalEndpoint
    Export:
      Name: !Sub '${AWS::StackName}-PortalEndpoint'
  
  CustomDomainEndpoint:
    Description: 'Custom domain endpoint for the portal'
    Value: !Sub 'https://${CustomDomainName}'
    Export:
      Name: !Sub '${AWS::StackName}-CustomDomainEndpoint'
  
  CloudFrontDistributionId:
    Description: 'CloudFront Distribution ID'
    Value: !Ref CloudFrontDistribution
    Export:
      Name: !Sub '${AWS::StackName}-CloudFrontDistributionId'
  
  CloudFrontDomainName:
    Description: 'CloudFront Distribution Domain Name'
    Value: !GetAtt CloudFrontDistribution.DomainName
    Export:
      Name: !Sub '${AWS::StackName}-CloudFrontDomainName'
  
  CertificateArn:
    Description: 'SSL Certificate ARN used by CloudFront'
    Value: !Ref CertificateArn
    Export:
      Name: !Sub '${AWS::StackName}-CertificateArn'

Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: "Existing Portal Configuration"
        Parameters:
          - PortalEndpoint
      - Label:
          default: "Custom Domain Configuration"
        Parameters:
          - CustomDomainName
          - CertificateArn
          - CreateRoute53Record
          - HostedZoneId
    ParameterLabels:
      PortalEndpoint:
        default: "Portal Endpoint"
      CustomDomainName:
        default: "Custom Domain Name"
      CertificateArn:
        default: "SSL Certificate ARN"
      CreateRoute53Record:
        default: "Create Route53 Record"
      HostedZoneId:
        default: "Hosted Zone ID"