Config: improve config loading and parsing error handling

closes #4654
closes #3454

src/utils/Config.php

@@ -23,6 +23,7 @@ declare(strict_types=1);
 
 namespace pocketmine\utils;
 
+use pocketmine\errorhandler\ErrorToExceptionHandler;
 use Webmozart\PathUtil\Path;
 use function array_change_key_case;
 use function array_fill_keys;
@@ -33,6 +34,7 @@ use function date;
 use function explode;
 use function file_exists;
 use function file_get_contents;
+use function get_debug_type;
 use function implode;
 use function is_array;
 use function is_bool;
@@ -167,20 +169,31 @@ class Config{
 			if($content === false){
 				throw new \RuntimeException("Unable to load config file");
 			}
-			$config = null;
 			switch($this->type){
 				case Config::PROPERTIES:
 					$config = self::parseProperties($content);
 					break;
 				case Config::JSON:
-					$config = json_decode($content, true);
+					try{
+						$config = json_decode($content, true, flags: JSON_THROW_ON_ERROR);
+					}catch(\JsonException $e){
+						throw ConfigLoadException::wrap($this->file, $e);
+					}
 					break;
 				case Config::YAML:
 					$content = self::fixYAMLIndexes($content);
-					$config = yaml_parse($content);
+					try{
+						$config = ErrorToExceptionHandler::trap(fn() => yaml_parse($content));
+					}catch(\ErrorException $e){
+						throw ConfigLoadException::wrap($this->file, $e);
+					}
 					break;
 				case Config::SERIALIZED:
-					$config = unserialize($content);
+					try{
+						$config = ErrorToExceptionHandler::trap(fn() => unserialize($content));
+					}catch(\ErrorException $e){
+						throw ConfigLoadException::wrap($this->file, $e);
+					}
 					break;
 				case Config::ENUM:
 					$config = array_fill_keys(self::parseList($content), true);
@@ -188,7 +201,10 @@ class Config{
 				default:
 					throw new \InvalidArgumentException("Invalid config type specified");
 			}
-			$this->config = is_array($config) ? $config : $default;
+			if(!is_array($config)){
+				throw new ConfigLoadException("Failed to load config $this->file: Expected array for base type, but got " . get_debug_type($config));
+			}
+			$this->config = $config;
 			if($this->fillDefaults($default, $this->config) > 0){
 				$this->save();
 			}

src/utils/ConfigLoadException.php

@@ -0,0 +1,31 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\utils;
+
+final class ConfigLoadException extends \RuntimeException{
+
+	public static function wrap(string $fileName, \Exception $e) : self{
+		return new self("Failed to parse config $fileName: " . $e->getMessage(), 0, $e);
+	}
+}