How to allow a guest to access only certain products

My website is a membership store. We require a new user to be confirmed as a member before giving them access to the product pages. However we would like to allow a guest access to the join membership product page only.

Does anyone have an idea how I could accomplish this?

If it's just the product pages, you could use something like:

if(!$_SESSION['customer_id'] && $_GET['products_id'] != 'MEMBERSHIP_PRODUCT_ID') {
    zen_redirect......
}

and redirect to the membership page.

if($_SESSION['customers_authorization'] > 0) {
    zen_redirect......
}

and redirect to any page that explains they are still not authorized.

I'd put it in includes/modules/pages/product_info/header_php.php (although it would be wiser to do it using an observer, I know I know...).

balihr:

(although it would be wiser to do it using an observer, I know I know...).

Hahaha... :) points for acknowledging the wiser option.. :) similar code for both "styles", at least the "action" part.

Sorry chimed in cuz of the above. :) could reference the last time an observer was created to sort out a similar issue at least that way an example of an observer would be present and the above code could be used "further". :)