Rails - Mar 2011 - Strange issue with Rails middleware, Warden and missing path paremeters

Hey,

this started as OmniAuth issue and is pretty well document 
here: https://github.com/intridea/omniauth/issues/#issue/239/comment/917065

If you have a bare Rails app with Devise gem (Warden itself would probably 
be enough), add the following middleware to simulate OmniAuth behavior:

class BreakApp
 def initialize(app)
   @app = app
 end

 def call(env)
   @app.call(env.dup) # call 1
   @app.call(env) # call 2
 end
end

and call Warden in ApplicationController before_filter e.g.:

request.env[''warden''].authenticate(:scope => :user)

then params[:controller] and params[:action] are missing.

If you remove the before filter *or* change the first call in the middleware 
to @app.call(env) (without #dup) it works fine. I prepared a sample app to 
show this issue: https://github.com/szimek/omniauth_dynamic_providers_bug

I have no idea if this issue is caused by Rails or Warden code. Any ideas 
why path parameters are missing and how to fix it are welcome :)

Cheers,
Szymon 

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