A SAM template that describe an Amazon CloudFront distribution that redirect all request to a specific URL using a CloudFront Function

template.yml

AWSTemplateFormatVersion: 2010-09-09
Transform:
  - AWS::Serverless-2016-10-31

# Template Information

Description: "Website redirect"

# Template Parameters

Parameters:
  RedirectStatusCode:
    Type: String
    Description: "The redirect status code"
    Default: "307"
    AllowedValues:
      - '301'
      - '302'
      - '307'
  RedirectStatusDescription:
    Type: String
    Description: "The redirect status description"
    Default: "Temporary Redirect"
  RedirectUrl:
    Type: String
    Description: "The redirect URL"
  AcmCertificateArn:
    Type: String
    Description: "The certificate arn for the domain name provided"
  CloudFrontAliases:
    Type: CommaDelimitedList
    Description: "The endpoint aliases valid for provided certificate"
  CloudFrontPriceClass:
    Type: String
    Description: "The price class for CloudFront distribution"
    Default: "PriceClass_100"
    AllowedValues:
      - PriceClass_100
      - PriceClass_200
      - PriceClass_All

# Template Resources

Resources:

  RedirectFunction:
    Type: AWS::CloudFront::Function
    Properties: 
      Name: !Sub "${AWS::StackName}-redirect"
      AutoPublish: true
      FunctionCode: !Sub |
        function handler() {
          return {
            statusCode: ${RedirectStatusCode},
            statusDescription: '${RedirectStatusDescription}',
            headers: { location: { value: '${RedirectUrl}' } }
          }
        }
      FunctionConfig: 
        Comment: !Sub "redirect all requests to ${RedirectUrl}"
        Runtime: cloudfront-js-1.0

  Distribution:
    Type: AWS::CloudFront::Distribution
    Properties:
      DistributionConfig:
        Enabled: true
        Comment: !Ref AWS::StackName
        Origins:
          - DomainName: "fake.com"
            Id: fakeOrigin
            CustomOriginConfig:
              HTTPSPort: 443
              OriginProtocolPolicy: "https-only"
        DefaultCacheBehavior:
          Compress: 'true'
          AllowedMethods:
            - GET
            - HEAD
            - OPTIONS
          TargetOriginId: fakeOrigin
          ForwardedValues:
            QueryString: false
            Cookies:
              Forward: none
          ViewerProtocolPolicy: redirect-to-https
          FunctionAssociations:
            - EventType: viewer-request
              FunctionARN: !GetAtt RedirectFunction.FunctionMetadata.FunctionARN
        PriceClass: !Ref CloudFrontPriceClass
        Aliases: !Ref CloudFrontAliases
        ViewerCertificate:
          AcmCertificateArn: !Ref AcmCertificateArn
          SslSupportMethod: sni-only

# Template Outputs

Outputs:
  CloudFrontDistribution:
    Description: "The CloudFront distribution in front of the S3 bucket"
    Value: !Ref Distribution