Rails 4 - use cloudfront with Paperclip

Question

I have an application which works already (in staging and prod) with S3.
Now we want it to work with cloudfront.

I figured out that from some reason I have paperclip definitions in two places:

/confog/initializers/paperclip.rb:

if Rails.env.production? || Rails.env.staging? || true
  Paperclip::Attachment.default_options[:url] = ':s3_domain_url'
  Paperclip::Attachment.default_options[:path] = '/:class/:attachment/:id_partition/:style/:filename'
end

/config/environments/staging.rb and /config/environments/production.rb

config.paperclip_defaults = {
  :storage => :s3,
  :s3_credentials => {
    :bucket => s3_options[:bucket],
    :access_key_id => s3_options[:access_key_id],
    :secret_access_key => s3_options[:secret_access_key]
  }
}

(I load s3_options from s3.yml file which I have)

First question - is it necessary (or on the other hand - is it wrong) to have these two places with configuration?

With this configuration I get this:

> Profile.last.image.url
=> "https://mybucket.s3.amazonaws.com/profiles/images/000/000/001/original/someimage.jpg?1439912576"

My goal: Get cloundfront url instead of s3.

I tried several things:

1. Add to paperclip.rb this line:

   Paperclip::Attachment.default_options[:s3_host_alias]  = "xxxxx.cloudfront.net"
   

   (where xxxxx stands for the cloudfront hash).
   Result: nothing is changed.

2. Add to paperclip.rb this line:

   Paperclip::Attachment.default_options[:s3_host_name]  = "xxxxx.cloudfront.net"
   

   (where xxxxx stands for the cloudfront hash).
   Result: paperclip concatenate the bucket name before it:

   > Profile.last.image.url
   => "https://mybucket.xxxxx.cloudfront.net/profiles/images/000/000/001/original/someimage.jpg?1439912576"
   

3. Disable configuration in paperclip.rb and add these lines to the environment config file (I tried it on development.rb):

   config.paperclip_defaults = {
          :
     :s3_credentials => {
        :
        :
       :url => "xxxxx.cloudfront.net",
       :s3_host_name => "xxxxx.cloudfront.net",
       :path => '/:class/:attachment/:id_partition/:style/:filename',
     }
   }
   

   Result: paperclip concatenate the bucket name after it:

   > Profile.last.image.url
   => "https://xxxxx.cloudfront.net/mybucket/profiles/images/000/000/001/original/someimage.jpg?1439912576"
   

4. As (3), but add these lines one level higher:

   config.paperclip_defaults = {
     :storage => :s3,
     :url => "xxxxx.cloudfront.net",
     :s3_host_name => "xxxxx.cloudfront.net",
     :path => '/:class/:attachment/:id_partition/:style/:filename',
     :s3_credentials => {
        :
        :
     }
   }
   

   Result: Same as (3).

Briefly, no matter what I put in :s3_host_name, paperclip concatenate the bucket name in some place.

Some idea?

Answer 1

Ended using:

  amazon = AppConfiguration.for :amazon

  config.paperclip_defaults = {
    storage: :s3,
    url: ':s3_alias_url',
    s3_host_alias: amazon.cloudfront,
    path: '/:class/:attachment/:id_partition/:style/:filename',
    s3_protocol: :https,
    s3_credentials: {
      bucket: amazon.s3_bucket_name,
      access_key_id: amazon.aws_access_key_id,
      secret_access_key: amazon.aws_secret_access_key
    }
  }

Alternative to AppConfiguration

config.paperclip_defaults = {
  storage: :s3,
  url: ':s3_alias_url',
  s3_host_alias: ENV['AMAZON_CLOUDFRONT'],
  path: '/:class/:attachment/:id_partition/:style/:filename',
  s3_protocol: :https,
  s3_credentials: {
    bucket: ENV['AMAZON_S3_BUCKET_NAME'],
    access_key_id: ENV['AMAZON_AWS_ACCESS_KEY_ID'],
    secret_access_key: ENV['AMAZON_AWS_SECRET_ACCESS_KEY']
  }
}

Important to say, don't use Rails.application.secrets here. It's not available when the config files are loading on rails 4.1.8 at least

Answer 2

It was easier than I thought.
Looks like paperclip uses :url either as a string or as a reference for a symbol which indicates how to construct the url.

In my /config/environments/staging.rb and /config/environments/production.rb files I have now:

config.paperclip_defaults = {
  :storage => :s3,
  :url => ':s3_alias_url',
  :s3_host_alias => "xxxxx.cloudfront.net",
  :path => '/:class/:attachment/:id_partition/:style/:filename',
  :s3_credentials => {
       :
       :
  }
}