fix: remove all direct config accessors

This addresses an issue in pfSense 24.11 where the global  variable has been deprecated

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Core/Form.inc

@@ -319,7 +319,7 @@ class Form {
      */
     final public function print_form(): void {
         # Print the static pfSense UI and include any custom CSS or JS files
-        global $config, $user_settings;
+        global $user_settings;
         $pgtitle = $this->title_path;
         include 'head.inc';
         echo "<link rel='stylesheet' href='$this->custom_css'/>";

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Core/Model.inc

@@ -550,8 +550,7 @@ class Model {
      */
     protected static function init_config(string $path) {
         # Initialize the configuration array of a specified path.
-        global $config;
-        array_init_path($config, $path);
+        config_init_path($path);
     }
 
     /**
@@ -562,8 +561,7 @@ class Model {
      *          path keys an empty string and $default is non-null
      */
     public static function get_config(string $path, mixed $default = null) {
-        global $config;
-        return array_get_path($config, $path, $default);
+        return config_get_path($path, $default);
     }
 
     /**
@@ -574,8 +572,7 @@ class Model {
      * @returns mixed $val or $default if the path prefix does not exist
      */
     public static function set_config(string $path, mixed $value, mixed $default = null) {
-        global $config;
-        return array_set_path($config, $path, $value, $default);
+        return config_set_path($path, $value, $default);
     }
 
     /**
@@ -616,8 +613,7 @@ class Model {
      * @returns array copy of the removed value or null
      */
     public static function del_config(string $path): mixed {
-        global $config;
-        return array_del_path($config, $path);
+        return config_del_path($path);
     }
 
     /**
@@ -630,8 +626,7 @@ class Model {
      * non-null value, otherwise false.
      */
     public static function is_config_enabled(string $path, string $enable_key = 'enable'): bool {
-        global $config;
-        return array_path_enabled($config, $path, $enable_key);
+        return config_path_enabled($path, $enable_key);
     }
 
     /**
@@ -680,8 +675,7 @@ class Model {
      * @param bool $force_parse Force an entire reparse of the config.xml file instead of the cached config.
      */
     public static function reload_config(bool $force_parse = false): void {
-        global $config;
-        $config = parse_config(parse: $force_parse);
+        config_set_path("", parse_config(parse: $force_parse));
     }
 
     /**

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Core/TestCase.inc

@@ -44,9 +44,6 @@ class TestCase {
      * @throws Error|Exception The exception thrown by failed Tests, typically an AssertionError.
      */
     public function run(): void {
-        # Need direct config access to revert any changes made by Tests
-        global $config;
-
         # Collect available environment variables
         $this->get_envs();
 
@@ -64,7 +61,7 @@ class TestCase {
             # If this method starts with `test`, run the function.
             if (str_starts_with($method, 'test')) {
                 # Backup the current config so we can undo any changes made during the test
-                $original_config = unserialize(serialize($config));
+                $original_config = config_get_path("");
 
                 # Set the current method undergoing testing
                 $this->method = $method;
@@ -78,14 +75,14 @@ class TestCase {
                     $this->$method();
                 } catch (Error | Exception $e) {
                     # Restore the original configuration, teardown the TestCase and throw the encountered error
-                    $config = $original_config;
+                    config_set_path("", $original_config);
                     write_config("Restored config after API test '$method'");
                     $this->teardown();
                     throw $e;
                 }
 
                 # Restore the config as it was when the test began.
-                $config = $original_config;
+                config_set_path("", $original_config);
                 write_config("Restored config after API test '$method'");
             }
         }

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Models/RoutingGateway.inc

@@ -207,8 +207,8 @@ class RoutingGateway extends Model {
             # Ensure the gateway cannot be disabled while it is in use by a system DNS server
             # TODO: replace with a Model query when the SystemDNSServer Model is developed
             $dnsgw_counter = 1;
-            while (isset($config['system']["dns{$dnsgw_counter}gw"])) {
-                if ($this->name->value == $config['system']["dns{$dnsgw_counter}gw"]) {
+            while ($this->get_config("system/dns{$dnsgw_counter}gw")) {
+                if ($this->name->value == $this->get_config("system/dns{$dnsgw_counter}gw")) {
                     throw new ValidationError(
                         message: 'Gateway cannot be disabled because it is in use by a system DNS ' .
                             "server with ID `$dnsgw_counter`",