Is it possible to restrict access to specific pages in the admin area based on the page slug?

Question

I would like to restrict access to specific pages in the admin area to only the admin role (and / or specific users). There appears to be no shortage of answers on how to do this using the page ID's - but I can't seem to find any examples of how to do this with a page slug.

Extended explanation: I have a list of pages (slugs are: login, logout, lostpassword, register, and resetpass) that I utilize across multiple websites in order to create corresponding pages that match the rest of the theme. But these are pages that are never directly edited and their presence to editors, contributors, etc. is unnecessary, possibly confusing, and certainly not anything I would want them to try and edit or delete.

Since page ID's can vary from site to site, it would be handy to have a function that I could simply copy and paste and not have to worry about it. Thank you for taking the time to read this question and for any answers that might be contributed!

Answer 1

So following from the comment discussion, a sufficient answer on another StackEx question goes like this:

add_filter( 'parse_query', 'exclude_pages_from_admin' );
function exclude_pages_from_admin($query) {
    global $pagenow,$post_type;
    if (is_admin() && $pagenow=='edit.php' && $post_type =='page') {
        $query->query_vars['post__not_in'] = array('21','22','23');
    }
}

The only part that's terribly important to us is the array of post IDS.

The problem is that a post on a given installation can have the identical slug, but will normally have a different ID.

So, what if we create an array of the to-be-excluded post slugs:

$excludeds = array( 'login', 'logout', 'lostpassword', 'register', 'resetpass' );

foreach ( $excludeds as $excluded ) {

        $excluded_IDs[] = get_page_by_path( $excluded )->ID;

}

This ought to work from installation to installation assuming identically slugged posts/pages:

add_filter( 'parse_query', 'exclude_pages_from_admin_by_slug' );

function exclude_pages_from_admin_by_slug( $query ) { 

    global $pagenow, $post_type;

    //set the array of to be excluded slugs
    $excludeds = array( 'login', 'logout', 'lostpassword', 'register', 'resetpass' );

    //get array of IDs from array of slugs
    foreach ( $excludeds as $excluded ) {

        $excluded_IDs[] = get_page_by_path( $excluded )->ID;

    }

    if ( is_admin() && $pagenow=='edit.php' && $post_type =='page' ) {

        //exclude those IDs from query
        $query->query_vars['post__not_in'] = $excluded_IDs;

    }

}

Can't vouch for the entirety of the code from testing, and obviously it was meant to answer a different question. Since we don't have alternative code to go on, the only interest here is a model for deriving an array of to-be-excluded IDs and employing it.