expiring_url does not use s3_host_alias

[anark]

When using paperclip with :url => ":s3_alias_url" and a s3_host_alias set the expiring_url does not use the s3_host_alias.

This really makes a difference when using cloudfront with paperclip. It would be great to be able to offer expiring url's that used the cloudfront endpoint instead of the direct s3 endpoint.

[marcelrouw]

I ran into the same issue.
Is there a fix or a work around?

[sudara]

This config in the default or per-model options fixes it for me:

s3_url_options: { virtual_host: true }

This is changed behavior from version 4, but not specified in docs or the upgrade guide.

Old paperclip didn't use the s3_host_alias in the expiring_url, but

1. It defaulted to http urls (vs. https) and
2. The way it did signing allowed you to do something like expiring_url.gsub('s3.amazonaws.com/','') to get an url on your CNAME.

After reading some code, it seems that paperclip 5.x merges in s3_url_options to the options it sends s3 presigner. The presigner has an option to use the virtual host (which will force http). See http://docs.aws.amazon.com/sdkforruby/api/Aws/S3/Presigner.html#presigned_url-instance_method or the change in implementation here: sudara/alonetone@d227614

[anark]

Even with
s3_url_options: { virtual_host: true }

the
attachment.expiring_url

still give the s3 url instead of using the alias url for me.

[sidraval]

Thank you for reporting this. Unfortunately, we will be deprecating Paperclip and therefore will not have the bandwidth to address this issue.