Use the derived WebsiteURL

A given region, will not have a predictable website url, see: https://docs.aws.amazon.com/general/latest/gr/rande.html#s3_website_region_endpoints This is annoying. Further, it is annoying that an Origin can not have 'http://' in it so we can not use the AWS::S3::Bucket WebsiteURL attribute. Ergo, this complicated Fn::Split, Fn::Select thing.
jolexa · Jul 25, 2017 · 6526541 · 6526541
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commit 6526541
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diff --git a/primary-region-infra.yml b/primary-region-infra.yml
@@ -114,7 +114,8 @@ Resources:
         Enabled: 'true'
         HttpVersion: http2
         Origins:
-        - DomainName: !Sub "${PrimaryBucket}.s3-website-${AWS::Region}.amazonaws.com"
+          # Use the WebsiteURL /but/ use the part after '//'
+        - DomainName: !Select [ "1" , "Fn::Split": [ "//", "Fn::GetAtt": [ PrimaryBucket, WebsiteURL ] ] ]
           Id: PrimaryBucketOrigin
           CustomOriginConfig:
             OriginProtocolPolicy: "http-only"

diff --git a/standby-region-infra.yml b/standby-region-infra.yml
@@ -68,7 +68,8 @@ Resources:
         Enabled: true
         HttpVersion: http2
         Origins:
-        - DomainName: !Sub "${StandbyReplicationBucket}.s3-website-${AWS::Region}.amazonaws.com"
+          # Use the WebsiteURL /but/ use the part after '//'
+        - DomainName: !Select [ "1" , "Fn::Split": [ "//", "Fn::GetAtt": [ StandbyReplicationBucket, WebsiteURL ] ] ]
           Id: StandbyBucketOrigin
           CustomOriginConfig:
             OriginProtocolPolicy: "http-only"