Force https on URLs when behind proxy; closes pterodactyl#3623

Author: DaneEveritt

app/Providers/AppServiceProvider.php

@@ -4,9 +4,11 @@
 
 use View;
 use Cache;
+use Illuminate\Support\Str;
 use Pterodactyl\Models\User;
 use Pterodactyl\Models\Server;
 use Pterodactyl\Models\Subuser;
+use Illuminate\Support\Facades\URL;
 use Illuminate\Pagination\Paginator;
 use Illuminate\Support\Facades\Schema;
 use Illuminate\Support\ServiceProvider;
@@ -32,6 +34,15 @@ public function boot()
         View::share('appIsGit', $this->versionData()['is_git'] ?? false);
 
         Paginator::useBootstrap();
+
+        // If the APP_URL value is set with https:// make sure we force it here. Theoretically
+        // this should just work with the proxy logic, but there are a lot of cases where it
+        // doesn't, and it triggers a lot of support requests, so lets just head it off here.
+        //
+        // @see https://github.com/pterodactyl/panel/issues/3623
+        if (Str::startsWith(config('app.url') ?? '', 'https://')) {
+            URL::forceScheme('https');
+        }
     }
 
     /**