ActiveStorage should give users the option to proxy files. This would allow
files to be cached by a CDN (image load times for my application went from
500+ms to 50ms) 🚀. Something along the lines of this is what I'm proposing:
# frozen_string_literal: true
module ActiveStorage
class BlobsController < BaseController
include ActiveStorage::SetBlob
def show
if ActiveStorage.redirect_to_service_url
expires_in ActiveStorage.service_urls_expire_in
redirect_to @blob.service_url(disposition: params[:disposition])
else
stream_blob
end
end
def stream_blob
expires_in ActiveStorage.service_urls_expire_in, public: true
response.headers['Content-Type'] = params[:content_type]
response.headers['Content-Disposition'] = params[:disposition]
@blob.download do |chunk|
response.stream.write(chunk)
end
ensure
response.stream.close
end
end
end
Users looking for image loading with a CDN could set this up by setting
app.config.active_storage.redirect_to_service_url = false
app.config.active_storage.service_urls_expire_in = 1.year
I just threw this together for a project I'm working on, but I would be
happy to clean this up and make a proper pull request if the Rails team is
open to the idea. There's a fair amount of people requesting this
feature https://github.com/rails/rails/issues/31419 some of the solutions
in this issue are directly linking to the service files, but streaming
would keep the service provider abstracted away while also allowing for
proper CDN caching.
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