SWFUpload Rails 2.3 server side code

initializer.rb

ActionController::Dispatcher.middleware.insert_before(ActionController::Base.session_store, FlashSessionCookieMiddleware, ActionController::Base.session_options[:session_key])

some_controller.rb

# just so you get an idea of what params will look like...
# Flash uploads with mime type application/octet-stream, so you need to fix it
# you can either set it manually via extension or use the mime-types gem

  def process_bulk_upload
    @asset = Asset.find(params[:asset_id])
    mime_type = MIME::Types.type_for(params["Filename"]).to_s
    case mime_type
    when "application/pdf"
      @asset.pdf_preview = params["Filedata"]
      @asset.pdf_preview_content_type = mime_type
    when "image/jpeg"
      @asset.thumbnail = params["Filedata"]
      @asset.thumbnail = mime_type
    else
      raise "Improper type"
    end
    @asset.save!
    head :ok
  end

somewhere_it_will_get_loaded.rb

require 'rack/utils'

class FlashSessionCookieMiddleware
  def initialize(app, session_key = '_session_id')
    @app = app
    @session_key = session_key
  end

  def call(env)
    if env['HTTP_USER_AGENT'] =~ /^(Adobe|Shockwave) Flash/
      params = ::Rack::Utils.parse_query(env['QUERY_STRING'])
      env['HTTP_COOKIE'] = [ @session_key, params[@session_key] ].join('=').freeze unless params[@session_key].nil?
    end
    @app.call(env)
  end
end