Paperclip + valums’s file-uploader problem on Heroku

gistfile1.txt

FIXED: See the next file for a working RawFileUpload class. 

UPDATE: Heroku uses thin server and I use webrick. When I tried thin on my local machine, it didn't work. 
So, the conclusion is there is some difference between webrick and thin that's causing the problem.


This file is related to this blog post: 
http://mooooooooooo.wordpress.com/2010/12/03/paperclip-valums%E2%80%99s-file-uploader-and-middleware-continued/

The code in the blog post works fine on my local machine but not on Heroku.


# In my photos_controller.rb:
def create
  # print params to log
  puts "photo create params: " + params.inspect
  if @photo.save
    #...
  end
end

The output for the params line in my local machine:
photo create params: {"photo"=>{"image"=>#<ActionDispatch::Http::UploadedFile:0x00000003fb1910 @original_filename="Desert.jpg", @content_type=image/jpeg, @headers=nil, @tempfile=#<File:/tmp/raw-upload.20110711-3169-yigmmi>>}, "authenticity_token"=>"0yvXnzV8fnsP24eAxJFH4aViG4nBMydB6O+dZ7HdY+4=", "qqfile"=>"Desert.jpg", "action"=>"create", "controller"=>"photos", "venue_id"=>"test"}

And same thing on Heroku:
photo create params: {"authenticity_token"=>"2WiyKzNC10V8op6ryCRA24zdqjvWPF7HQgsv9L95zL0=", "qqfile"=>"Desert.jpg", "action"=>"create", "controller"=>"photos", "venue_id"=>"foo"}

Clearly something is wrong there. 

Here's my 'rake middleware' output on local machine:
use ActionDispatch::Static
use ActionDispatch::Static
use Rack::Lock
use ActiveSupport::Cache::Strategy::LocalCache
use Rack::Runtime
use Rails::Rack::Logger
use ActionDispatch::ShowExceptions
use ActionDispatch::RemoteIp
use Rack::Sendfile
use ActionDispatch::Callbacks
use ActiveRecord::ConnectionAdapters::ConnectionManagement
use ActiveRecord::QueryCache
use ActionDispatch::Cookies
use ActionDispatch::Session::CookieStore
use ActionDispatch::Flash
use ActionDispatch::ParamsParser
use Rack::MethodOverride
use ActionDispatch::Head
use ActionDispatch::BestStandardsSupport
use Warden::Manager
use RawFileUpload
use OmniAuth::Strategies::Facebook
run MyApp::Application.routes


And same thing on Heroku:
use ActionDispatch::Static
use ActionDispatch::Static
use Rack::Lock
use Rack::Runtime
use Rails::Rack::Logger
use ActionDispatch::ShowExceptions
use ActionDispatch::RemoteIp
use Rack::Sendfile
use ActionDispatch::Callbacks
use ActiveRecord::ConnectionAdapters::ConnectionManagement
use ActiveRecord::QueryCache
use ActionDispatch::Cookies
use ActionDispatch::Session::CookieStore
use ActionDispatch::Flash
use ActionDispatch::ParamsParser
use Rack::MethodOverride
use ActionDispatch::Head
use ActionDispatch::BestStandardsSupport
use Warden::Manager
use RawFileUpload
use OmniAuth::Strategies::Facebook
run MyApp::Application.routes

raw_file_upload.rb

require 'mime/types'

class RawFileUpload
  def initialize(app)
    @app = app
  end
  
  def call(env)
    if raw_file_post?(env)
      convert_and_call(env)
    else
      @app.call(env)
    end
  end
  
  private
  def raw_file_post?(env)
    env['HTTP_X_FILE_NAME'] &&
      env['CONTENT_TYPE'] == 'application/octet-stream' &&
      env['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest'
  end
  
  def convert_and_call(env)
    # sometimes env['rack.input'] is Tempfile, sometimes StringIO => make it always StringIO 
    input = env['rack.input']
    if input.is_a? Tempfile
      input = StringIO.new(input.read)
    end
    env['rack.input'] = input
    
    # convert to UTF8
    tempfile = Tempfile.new('raw-upload.')
    input.each do |chunk|
      tempfile << chunk.force_encoding('UTF-8')
    end
    tempfile.flush
    tempfile.rewind
    
    multipart_hash = {
      :image => {
        :filename => env['HTTP_X_FILE_NAME'],
        :type => MIME::Types.type_for(env['HTTP_X_FILE_NAME']).first,
        :tempfile => tempfile
      }
    }
    
    env['rack.request.form_input'] = env['rack.input']
    
    env['rack.request.form_hash'] ||= {}
    env['rack.request.query_hash'] ||= {}
    
    env['rack.request.form_hash']['photo'] = multipart_hash
    env['rack.request.query_hash']['photo'] = multipart_hash
    
    @app.call(env)
  end
end