[Facebooker-talk] Session key invalid or no longer valid

[kevin lochner]

I'm using a rescue.  I tried advancing this discussion a couple weeks  
ago - the problem is that to really *know* that the session is valid,  
you have to try using it (i.e., hit the facebook rest server with a  
request).  I think it's a waste to
constantly ping the facebook server just to make sure you don't get an  
invalid session error when you're not expecting it, especially given  
that this scenario will be low-frequency with respect to total requests.

So here's what I did in facebooker/rails/controller.rb:

module Facebooker
   module Rails
     module Controller
       def self.included(controller)
         controller.rescue_from  
Facebooker::Session::SessionExpired, :with => :facebook_session_expired
       end

       def facebook_session_expired
           clear_fb_cookies!
           clear_facebook_session_information
           flash[:error] = "Your facebook session has expired."
           redirect_to root_url
         end

I'm hesitant to add this to facebooker because i'm not convinced  
everyone will want to do it this way, and
it probably means adding another parameter like "expired_session_url"  
so that this exception handling
works out of the box (since not everyone will redirect to root_url).

  - kevin


On Feb 1, 2009, at 12:51 PM, Adeel Ahmad wrote:

> This may be related to Aaron's question on Jan. 30. However in my  
> case I doing Facebook Connect using Facebooker for my site.
> Following the Facebook Connect tutorial it does create a session and  
> show the user as logged in. For now I have the same 'fb' controller  
> just to demo log in.
> However if the user logs out at facebook.com and then refreshes fb/ 
> index on my site, I get "Session key invalid or no longer valid" on  
> the line that outputs @facebook_session.user.name. Just FYI if I  
> output @facebook_session.user.to_s it does give me the uid.
> If you look at the stack trace below you'll notice that it passes  
> through a number of actions that test for existence and validity of  
> the session. It has a problem in the Error class of parser.rb. I  
> would think it should catch the problem a lot earlier than in  
> parser.rb.
> Any thoughts on how to troubleshoot and/or workaround this? I'm on  
> Rails 2.1.1.
>
> ========================================
>  Facebooker::Session::SessionExpired in Fb#index
>
> Showing fb/index.html.erb where line #10 raised:
>
> Session key invalid or no longer valid
>
> Extracted source (around line #10):
>
> 7: <%= fb_login_button%>
> 8:
> 9: <% if facebook_session %>
> 10:   <h2>You are logged in as <%= facebook_session.user.name %></h2>
> 11: <% else %>
> 12:   <h2>You are not logged in!</h2>
> 13: <% end %>
>
> vendor/plugins/facebooker/lib/facebooker/parser.rb:487:in `process'
> vendor/plugins/facebooker/lib/facebooker/parser.rb:15:in `parse'
> vendor/plugins/facebooker/lib/facebooker/service.rb:20:in `post'
> vendor/plugins/facebooker/lib/facebooker/session.rb:473:in  
> `post_without_logging'
> vendor/plugins/facebooker/lib/facebooker/session.rb:484:in `post'
> vendor/plugins/facebooker/lib/facebooker/logging.rb:27:in `log_fb_api'
> vendor/rails/activesupport/lib/active_support/core_ext/benchmark.rb: 
> 8:in `realtime'
> vendor/plugins/facebooker/lib/facebooker/logging.rb:27:in `log_fb_api'
> vendor/plugins/facebooker/lib/facebooker/session.rb:483:in `post'
> vendor/plugins/facebooker/lib/facebooker/models/user.rb:120:in  
> `populate'
> vendor/plugins/facebooker/lib/facebooker/model.rb:35:in `name'
> app/views/fb/index.html.erb:10:in  
> `_run_erb_47app47views47fb47index46html46erb'
>
>
> -- 
> - Adeel
>
>
>
> _______________________________________________
> Facebooker-talk mailing list
> Facebooker-talk at rubyforge.org
> http://rubyforge.org/mailman/listinfo/facebooker-talk

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