AWSTemplateFormatVersion: '2010-09-09'
Description: 'Creating the CloudFront Web Distribution and Route 53 Failover record sets.'
Parameters:
  DomainName:
    Description: Enter the application domain name(The hostname of the multi-region endpoint).
    Type: String
    AllowedPattern: (?!-)[a-zA-Z0-9-.]{1,63}(?<!-)
  Region1AppURL:
    Description: Enter the Application url of primary region (s3 website url without http:\\).
    Type: String
  Region2AppURL:
    Description: Enter the Application url of secondary region (s3 website url without http:\\).
    Type: String
  HostedZoneId:
    Description: The hosted zone we will create records in.
    Type: String  
Mappings:
  RegionMap:
    us-east-1:
      S3hostedzoneID: Z3AQBSTGFYJSTF
      websiteendpoint: s3-website-us-east-1.amazonaws.com
    us-east-2:
      S3hostedzoneID: Z2O1EMRO9K5GLX
      websiteendpoint: s3-website.us-east-2.amazonaws.com  
    us-west-1:
      S3hostedzoneID: Z2F56UZL2M1ACD
      websiteendpoint: s3-website-us-west-1.amazonaws.com
    us-west-2:
      S3hostedzoneID: Z3BJ6K6RIION7M
      websiteendpoint: s3-website-us-west-2.amazonaws.com
    ca-central-1:
      S3hostedzoneID: Z1QDHH18159H29
      websiteendpoint: s3-website.ca-central-1.amazonaws.com  
    eu-west-1:
      S3hostedzoneID: Z1BKCTXD74EZPE
      websiteendpoint: s3-website-eu-west-1.amazonaws.com
    ap-southeast-1:
      S3hostedzoneID: Z3O0J2DXBE1FTB
      websiteendpoint: s3-website-ap-southeast-1.amazonaws.com
    ap-southeast-2:
      S3hostedzoneID: Z1WCIGYICN2BYD
      websiteendpoint: s3-website-ap-southeast-2.amazonaws.com
    ap-northeast-1:
      S3hostedzoneID: Z2M4EHUR26P7ZW
      websiteendpoint: s3-website-ap-northeast-1.amazonaws.com
    sa-east-1:
      S3hostedzoneID: Z31GFT0UA1I2HV
      websiteendpoint: s3-website-sa-east-1.amazonaws.com
Resources:
  PrimaryCFEndPoint:
    Type: AWS::CloudFront::Distribution
    Properties:
      DistributionConfig:
        Comment: Cloudfront Distribution pointing to S3 bucket
        Origins:
        - DomainName: !Ref Region1AppURL
          Id: S3Origin
          CustomOriginConfig:
            HTTPPort: '80'
            HTTPSPort: '443'
            OriginProtocolPolicy: http-only
        Enabled: true
        HttpVersion: 'http2'
        DefaultRootObject: index.html
        Aliases:
        - !Ref DomainName
        DefaultCacheBehavior:
          AllowedMethods:
          - GET
          - HEAD
          Compress: true
          TargetOriginId: S3Origin
          ForwardedValues:
            QueryString: true
            Cookies:
              Forward: none
          ViewerProtocolPolicy: allow-all
        PriceClass: PriceClass_All
        ViewerCertificate:
          CloudFrontDefaultCertificate: true
  HealthcheckCF:
    Type: "AWS::Route53::HealthCheck"
    Properties:
      HealthCheckConfig:
        Port: "80"
        Type: "HTTP"
        ResourcePath: "/"
        FullyQualifiedDomainName: !GetAtt [PrimaryCFEndPoint, DomainName] 
        RequestInterval: "30"
        FailureThreshold: "2"
      HealthCheckTags: 
        - 
          Key: "Name"
          Value: "HealthcheckCF"  
  HealthcheckS3Bucket:
    Type: "AWS::Route53::HealthCheck"
    Properties:
      HealthCheckConfig:
        Port: "80"
        Type: "HTTP"
        ResourcePath: "/"
        FullyQualifiedDomainName: !Ref Region1AppURL
        RequestInterval: "30"
        FailureThreshold: "2"
      HealthCheckTags: 
        - 
          Key: "Name"
          Value: "HealthcheckS3Bucket"  
  HealthcheckCalculated:
    Type: "AWS::Route53::HealthCheck"
    Properties:
      HealthCheckConfig:
        Type: "CALCULATED"
        ChildHealthChecks: 
          - !Ref HealthcheckS3Bucket
          - !Ref HealthcheckCF
        HealthThreshold: 2
      HealthCheckTags: 
        - 
          Key: "Name"
          Value: "HealthcheckCalculated"   
  WebsiteDNSName:
    Type: AWS::Route53::RecordSetGroup
    Properties:
      HostedZoneId: !Ref HostedZoneId
      RecordSets:
      - Name: !Ref DomainName
        Type: A
        AliasTarget:
          HostedZoneId: Z2FDTNDATAQYW2
          DNSName: !GetAtt [PrimaryCFEndPoint, DomainName] 
        Failover: "PRIMARY"
        HealthCheckId: !Ref HealthcheckCalculated
        SetIdentifier: "primary-record"
      - Name: !Ref DomainName
        Type: A
        AliasTarget:
          HostedZoneId: !FindInMap [ RegionMap, !Ref 'AWS::Region', S3hostedzoneID]
          DNSName: !FindInMap [ RegionMap, !Ref 'AWS::Region', websiteendpoint]         
        Failover: "SECONDARY"
        SetIdentifier: "secondary-record"