How do you redirect a user to the Facebook login page from within the canvas?

Question

Possible Duplicate:
Facebook Login and Iframe redirection

When a user is not logged onto facebook but visits the canvas URL directly, the app shows up in the logged off state because no access token (or signed request) is being sent to it.

BUT since the application is framed and I'm NOT using the Javascript SDK (using Perl OAuth Module), how do I tell Facebook to jump to the login page instead of loading the logged-off canvas app page?

Answer 1

I ran into this same issue while attempting to redirect users to PayPal to make a payment.

The problem you're trying to explain is this:

• Facebook canvas apps are not allowed to access the parent window
• Canvas apps may only redirect to domains included in the App Domain field of the app's Basic Info section in the settings (https://developers.facebook.com/apps/<app_id>/summary)

The only way to accomplish authentication is to:

• Use the JavaScript SDK to pop up an auth window, or
• Use JavaScript to redirect to the Facebook oauth page (top.location = "<url>")

Answer 2

Since you own the code to the iframe, you should do the redirection with your code. Facebook only loads the URL you have set in the app settings. For app settings, there isn't a url for logged in and a url for logged out.