update file system

WebGL网页平台支持资源加密。

Assets/YooAsset/Runtime/FileSystem/Operation/Internal/DownloadWebNormalAssetBundleOperation.cs

@@ -0,0 +1,145 @@
+using UnityEngine;
+using UnityEngine.Networking;
+
+namespace YooAsset
+{
+    internal class DownloadWebNormalAssetBundleOperation : DownloadAssetBundleOperation
+    {
+        private readonly bool _disableUnityWebCache;
+        private DownloadHandlerAssetBundle _downloadhandler;
+        private ESteps _steps = ESteps.None;
+
+        internal DownloadWebNormalAssetBundleOperation(bool disableUnityWebCache, PackageBundle bundle, DownloadParam param) : base(bundle, param)
+        {
+            _disableUnityWebCache = disableUnityWebCache;
+        }
+        internal override void InternalOnStart()
+        {
+            _steps = ESteps.CreateRequest;
+        }
+        internal override void InternalOnUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            // 创建下载器
+            if (_steps == ESteps.CreateRequest)
+            {
+                // 获取请求地址
+                _requestURL = GetRequestURL();
+
+                // 重置变量
+                ResetRequestFiled();
+
+                // 创建下载器
+                CreateWebRequest();
+
+                _steps = ESteps.CheckRequest;
+            }
+
+            // 检测下载结果
+            if (_steps == ESteps.CheckRequest)
+            {
+                DownloadProgress = _webRequest.downloadProgress;
+                DownloadedBytes = (long)_webRequest.downloadedBytes;
+                Progress = DownloadProgress;
+                if (_webRequest.isDone == false)
+                {
+                    CheckRequestTimeout();
+                    return;
+                }
+
+                // 检查网络错误
+                if (CheckRequestResult())
+                {
+                    AssetBundle assetBundle = _downloadhandler.assetBundle;
+                    if (assetBundle == null)
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = "Download handler asset bundle object is null !";
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Result = assetBundle;
+                        Status = EOperationStatus.Succeed;
+                    }
+                }
+                else
+                {
+                    _steps = ESteps.TryAgain;
+                }
+
+                // 注意：最终释放请求器
+                DisposeWebRequest();
+            }
+
+            // 重新尝试下载
+            if (_steps == ESteps.TryAgain)
+            {
+                if (FailedTryAgain <= 0)
+                {
+                    Status = EOperationStatus.Failed;
+                    _steps = ESteps.Done;
+                    YooLogger.Error(Error);
+                    return;
+                }
+
+                _tryAgainTimer += Time.unscaledDeltaTime;
+                if (_tryAgainTimer > 1f)
+                {
+                    FailedTryAgain--;
+                    _steps = ESteps.CreateRequest;
+                    YooLogger.Warning(Error);
+                }
+            }
+        }
+        internal override void InternalOnAbort()
+        {
+            _steps = ESteps.Done;
+            DisposeWebRequest();
+        }
+
+        private void CreateWebRequest()
+        {
+            _downloadhandler = CreateWebDownloadHandler();
+            _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
+            _webRequest.downloadHandler = _downloadhandler;
+            _webRequest.disposeDownloadHandlerOnDispose = true;
+            _webRequest.SendWebRequest();
+        }
+        private void DisposeWebRequest()
+        {
+            if (_webRequest != null)
+            {
+                //注意：引擎底层会自动调用Abort方法
+                _webRequest.Dispose();
+                _webRequest = null;
+            }
+        }
+        private DownloadHandlerAssetBundle CreateWebDownloadHandler()
+        {
+            if (_disableUnityWebCache)
+            {
+                var downloadhandler = new DownloadHandlerAssetBundle(_requestURL, 0);
+#if UNITY_2020_3_OR_NEWER
+                downloadhandler.autoLoadAssetBundle = false;
+#endif
+                return downloadhandler;
+            }
+            else
+            {
+                // 注意：优先从浏览器缓存里获取文件
+                // The file hash defining the version of the asset bundle.
+                uint unityCRC = Bundle.UnityCRC;
+                Hash128 fileHash = Hash128.Parse(Bundle.FileHash);
+                var downloadhandler = new DownloadHandlerAssetBundle(_requestURL, fileHash, unityCRC);
+#if UNITY_2020_3_OR_NEWER
+                downloadhandler.autoLoadAssetBundle = false;
+#endif
+                return downloadhandler;
+            }
+        }
+    }
+}