Issue #299: posting to an admin Mod (eg editBuildings.php) could show an
essentially blank page. The admin panel and the game share the same PHP
session, so a game logout (session_destroy) — or a mobile browser dropping the
session cookie / serving a cached form with a stale token — wipes the admin
session. The Mod then stopped on a bare die('<h1>Access Denied</h1>') (or the
403 die() in csrf_verify()), which renders as a blank/broken page outside the
panel.
Add a shared admin_deny() helper in GameEngine/Admin/csrf.php that renders a
clean, self-contained, styled error page (with a "Return to Admin Panel" link)
and a no-store header, then exits. Wire it into csrf_verify() and replace every
bare "Access Denied" die() across the 42 admin Mods. Each Mod now loads
csrf.php at the top so admin_deny() is available before its first access check.
This is the presentation fix Shadow asked for ("we must receive an error not
blank page"). The deeper root cause (admin and game sharing one PHP session) is
left for a follow-up: giving the admin panel its own session cookie name.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Ferywir