从Flex上传文件到Rails 2服务器

Question

使用默认的Cookie会话存储时，是否有任何方法可以将文件从Flex应用程序上传到Rails 2.2后端？

Answer 1

No. The reason it doesn't work is because Flex does not transmit the cookies when using FileReference#upload. A workaround (for Rails 2.3) is to insert a custom middleware handler for flash requests that takes arguments in the query string and adds them to the HTTP_COOKIE environment before it reaches Rails.

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

Make sure the file is in your load path and add it to your session_store.rb:

ActionController::Dispatcher.middleware.use FlashSessionCookieMiddleware, ActionController::Base.session_options[:key]

Then you'll need to output the session key to a view somewhere and load it using ExternalInterface inside of Flex:

def upload_path_with_session_information
  session_key = ActionController::Base.session_options[:key]
  uploads_path(session_key => cookies[session_key], request_forgery_protection_token => form_authenticity_token)
end

As you can see I have resource called uploads and I use the upload_path_with_session_information helper to give me a nice URL that when POSTED to from FLEX lets you keep your cookie store for everything else.

I honestly don't remember where I found this information online, but I can't take the credit for it. Hope it makes sense for you.