Allowing User to Download File from S3 Storage

ruby-on-rails-3 amazon-s3 paperclip
RubyNewbie picture RubyNewbie · Oct 17, 2012 · Viewed 8.9k times · Source

Right now I am using Amazon S3 and Paperclip which is allowing my users to upload an image that is associated with the event they are creating. My ultimate goal is since others can view this event, to be able to click on the image and have it prompt a SAVE TO their computer. As of now, clicking the link will open the image in a browser window. I rather have it ask for them to download instead. All images only saved on S3, not local. Need to hide exposed s3 url as well if possible or camouflage it

Here is my current setup

Index.html

<%= link_to 'Download Creative', event.creative.url, class: "btn btn-info" %>

Event.rb

has_attached_file :creative,
                :styles => { :thumb => "150x150", :custcreative => "250x75" },
                :path => ":attachment/:id/:style.:extension",
                :s3_domain_url => "******.s3.amazonaws.com",
                :storage => :s3,
                :s3_credentials => Rails.root.join("config/s3.yml"),
                :bucket => '*****',
                :s3_permissions => :public_read,
                :s3_protocol => "http",
                :convert_options => { :all => "-auto-orient" },
                :encode => 'utf8'

Hoping someone can help me out.

Answer

guilleva picture guilleva · May 7, 2013

To avoid extra load to your app (saving dyno's time in Heroku), I would rather do something like this: add this method to your model with the attachment:

def download_url(style_name=:original)
  creative.s3_bucket.objects[creative.s3_object(style_name).key].url_for(:read,
      :secure => true,
      :expires => 24*3600,  # 24 hours
      :response_content_disposition => "attachment; filename='#{creative_file_name}'").to_s
end

And then use it in your views/controllers like this:

<%= link_to 'Download Creative', event.download_url, class: "btn btn-info" %>

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