feat(upload): 添加华为 OBS 对象存储支持

- 在 addons.php 中添加了与华为 OBS 相关的钩子
- 新增了对华为 OBS 上传功能的实现，包括分片上传和合并
- 优化了上传参数处理和错误处理
- 支持客户端和服务端两种上传模式

addons/hwobs/library/Obs/Internal/Common/ObsTransform.php

@@ -0,0 +1,78 @@
+<?php
+
+/**
+ * Copyright 2019 Huawei Technologies Co.,Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+ * this file except in compliance with the License.  You may obtain a copy of the
+ * License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ */
+
+namespace Obs\Internal\Common;
+
+use Obs\ObsClient;
+
+class ObsTransform implements ITransform {
+    private static $instance;
+    
+    private function __construct(){}
+    
+    public static function getInstance() {
+        if (!(self::$instance instanceof ObsTransform)) {
+            self::$instance = new ObsTransform();
+        }
+        return self::$instance;
+    }
+     
+    
+    public function transform($sign, $para) {
+        if ($sign === 'aclHeader') {
+            $para = $this->transAclHeader($para);
+        } else if ($sign === 'aclUri') {
+            $para = $this->transAclGroupUri($para);
+        } else if ($sign == 'event') {
+            $para = $this->transNotificationEvent($para);
+        } else if ($sign == 'storageClass') {
+            $para = $this->transStorageClass($para);
+        }
+        return $para;
+    }
+    
+    private function transAclHeader($para) {
+        if ($para === ObsClient::AclAuthenticatedRead || $para === ObsClient::AclBucketOwnerRead || 
+                $para === ObsClient::AclBucketOwnerFullControl || $para === ObsClient::AclLogDeliveryWrite) {
+            $para = null;
+        }
+        return $para;
+    }
+    
+    private function transAclGroupUri($para) {
+        if ($para === ObsClient::GroupAllUsers) {
+            $para = ObsClient::AllUsers;
+        }
+        return $para;
+    }
+    
+    private function transNotificationEvent($para) {
+        $pos = strpos($para, 's3:');
+        if ($pos !== false && $pos === 0) {
+            $para = substr($para, 3);
+        }
+        return $para;
+    }
+    
+    private function transStorageClass($para) {
+        $search = array('STANDARD', 'STANDARD_IA', 'GLACIER');
+        $repalce = array(ObsClient::StorageClassStandard, ObsClient::StorageClassWarm, ObsClient::StorageClassCold);
+        $para = str_replace($search, $repalce, $para);
+        return $para;
+    }
+}
+