Added capability to specify compatible protocol versions in plugin.yml (#1247)

Protocol-dependent plugins may specify the `mcpe-protocol` attribute in plugin.yml to disallow plugin loading when the protocol changes.

src/pocketmine/lang/locale

@@ -1 +1 @@
-Subproject commit 2ab4d9172eba05cb7c6b8c98639db2ba9e60472c
+Subproject commit eac602e8bc084fbaf3bc133129d6c8e4dc517c52

src/pocketmine/plugin/PluginDescription.php

@@ -23,12 +23,15 @@ declare(strict_types=1);
 
 namespace pocketmine\plugin;
 
+use pocketmine\network\mcpe\protocol\ProtocolInfo;
 use pocketmine\permission\Permission;
 
 class PluginDescription{
 	private $name;
 	private $main;
 	private $api;
+	/** @var int[] */
+	private $compatibleMcpeProtocols = [];
 	private $extensions = [];
 	private $depend = [];
 	private $softDepend = [];
@@ -76,6 +79,8 @@ class PluginDescription{
 			throw new PluginException("Invalid PluginDescription main, cannot start within the PocketMine namespace");
 		}
 
+		$this->compatibleMcpeProtocols = array_map("intval", (array) ($plugin["mcpe-protocol"] ?? []));
+
 		if(isset($plugin["commands"]) and is_array($plugin["commands"])){
 			$this->commands = $plugin["commands"];
 		}
@@ -147,6 +152,13 @@ class PluginDescription{
 		return $this->api;
 	}
 
+	/**
+	 * @return int[]
+	 */
+	public function getCompatibleMcpeProtocols() : array{
+		return $this->compatibleMcpeProtocols;
+	}
+
 	/**
 	 * @return string[]
 	 */

src/pocketmine/plugin/PluginManager.php

@@ -32,6 +32,7 @@ use pocketmine\event\HandlerList;
 use pocketmine\event\Listener;
 use pocketmine\event\Timings;
 use pocketmine\event\TimingsHandler;
+use pocketmine\network\mcpe\protocol\ProtocolInfo;
 use pocketmine\permission\Permissible;
 use pocketmine\permission\Permission;
 use pocketmine\Server;
@@ -258,6 +259,24 @@ class PluginManager{
 								continue;
 							}
 
+							if(count($pluginMcpeProtocols = $description->getCompatibleMcpeProtocols()) > 0){
+								$serverMcpeProtocols = [ProtocolInfo::CURRENT_PROTOCOL];
+								if(count(array_intersect($pluginMcpeProtocols, $serverMcpeProtocols)) === 0){
+									$this->server->getLogger()->error($this->server->getLanguage()->translateString(
+										"pocketmine.plugin.loadError",
+										[
+											$name,
+											$this->server->getLanguage()->translateString(
+												"%pocketmine.plugin.incompatibleProtocol",
+												[
+													implode(", ", $pluginMcpeProtocols)
+												])
+										]
+									));
+									continue;
+								}
+							}
+
 							$plugins[$name] = $file;
 
 							$softDependencies[$name] = $description->getSoftDepend();