// Downloads and compiles the script from a given Uri. // This code can be called by config for a downloaded control, we need to assert. // This code is called holding the lock. private AutoWebProxyState DownloadAndCompile(Uri location) { GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() location:" + ValidationHelper.ToString(location)); AutoWebProxyState newState = AutoWebProxyState.DownloadFailure; WebResponse response = null; TimerThread.Timer timer = null; AutoWebProxyScriptWrapper newScriptInstance = null; // Can't assert this in declarative form (DCR?). This Assert() is needed to be able to create the request to download the proxy script. ExceptionHelper.WebPermissionUnrestricted.Assert(); try { lock (lockObject) { if (aborted) { throw new WebException(NetRes.GetWebStatusString("net_requestaborted", WebExceptionStatus.RequestCanceled), WebExceptionStatus.RequestCanceled); } request = WebRequest.Create(location); } request.Timeout = Timeout.Infinite; request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.Default); request.ConnectionGroupName = "__WebProxyScript"; // We have an opportunity here, if caching is disabled AppDomain-wide, to override it with a // custom, trivial cache-provider to get a similar semantic. // // We also want to have a backup caching key in the case when IE has locked an expired script response // if (request.CacheProtocol != null) { GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Using backup caching."); request.CacheProtocol = new RequestCacheProtocol(backupCache, request.CacheProtocol.Validator); } HttpWebRequest httpWebRequest = request as HttpWebRequest; if (httpWebRequest != null) { httpWebRequest.Accept = "*/*"; httpWebRequest.UserAgent = this.GetType().FullName + "/" + Environment.Version; httpWebRequest.KeepAlive = false; httpWebRequest.Pipelined = false; httpWebRequest.InternalConnectionGroup = true; } else { FtpWebRequest ftpWebRequest = request as FtpWebRequest; if (ftpWebRequest != null) { ftpWebRequest.KeepAlive = false; } } // Use no proxy, default cache - initiate the download. request.Proxy = null; request.Credentials = Engine.Credentials; // Use our own timeout timer so that it can encompass the whole request, not just the headers. if (timerQueue == null) { timerQueue = TimerThread.GetOrCreateQueue(SettingsSectionInternal.Section.DownloadTimeout); } timer = timerQueue.CreateTimer(timerCallback, request); response = request.GetResponse(); // Check Last Modified. DateTime lastModified = DateTime.MinValue; HttpWebResponse httpResponse = response as HttpWebResponse; if (httpResponse != null) { lastModified = httpResponse.LastModified; } else { FtpWebResponse ftpResponse = response as FtpWebResponse; if (ftpResponse != null) { lastModified = ftpResponse.LastModified; } } GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() lastModified:" + lastModified.ToString() + " (script):" + (scriptInstance == null ? "(null)" : scriptInstance.LastModified.ToString())); if (scriptInstance != null && lastModified != DateTime.MinValue && scriptInstance.LastModified == lastModified) { newScriptInstance = scriptInstance; newState = AutoWebProxyState.Completed; } else { string scriptBody = null; byte[] scriptBuffer = null; using (Stream responseStream = response.GetResponseStream()) { SingleItemRequestCache.ReadOnlyStream ros = responseStream as SingleItemRequestCache.ReadOnlyStream; if (ros != null) { scriptBuffer = ros.Buffer; } if (scriptInstance != null && scriptBuffer != null && scriptBuffer == scriptInstance.Buffer) { scriptInstance.LastModified = lastModified; newScriptInstance = scriptInstance; newState = AutoWebProxyState.Completed; GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Buffer matched - reusing Engine."); } else { using (StreamReader streamReader = new StreamReader(responseStream)) { scriptBody = streamReader.ReadToEnd(); } } } WebResponse tempResponse = response; response = null; tempResponse.Close(); timer.Cancel(); timer = null; if (newState != AutoWebProxyState.Completed) { GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() IsFromCache:" + tempResponse.IsFromCache.ToString() + " scriptInstance:" + ValidationHelper.HashString(scriptInstance)); if (scriptInstance != null && scriptBody == scriptInstance.ScriptBody) { GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Script matched - using existing Engine."); scriptInstance.LastModified = lastModified; if (scriptBuffer != null) { scriptInstance.Buffer = scriptBuffer; } newScriptInstance = scriptInstance; newState = AutoWebProxyState.Completed; } else { GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Creating AutoWebProxyScriptWrapper."); newScriptInstance = new AutoWebProxyScriptWrapper(); newScriptInstance.LastModified = lastModified; if (newScriptInstance.Compile(location, scriptBody, scriptBuffer)) { newState = AutoWebProxyState.Completed; } else { newState = AutoWebProxyState.CompilationFailure; } } } } } catch (Exception exception) { if (Logging.On) { Logging.PrintWarning(Logging.Web, SR.GetString(SR.net_log_proxy_script_download_compile_error, exception)); } GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Download() threw:" + ValidationHelper.ToString(exception)); } finally { if (timer != null) { timer.Cancel(); } // try { if (response != null) { response.Close(); } } finally { WebPermission.RevertAssert(); // The request is not needed anymore. Set it to null, so if Abort() gets called, // after this point, it will result in a no-op. request = null; } } if ((newState == AutoWebProxyState.Completed) && (scriptInstance != newScriptInstance)) { if (scriptInstance != null) { scriptInstance.Close(); } scriptInstance = newScriptInstance; } GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() retuning newState:" + ValidationHelper.ToString(newState)); return(newState); }
private BaseWebProxyFinder.AutoWebProxyState DownloadAndCompile(Uri location) { BaseWebProxyFinder.AutoWebProxyState downloadFailure = BaseWebProxyFinder.AutoWebProxyState.DownloadFailure; WebResponse response = null; TimerThread.Timer timer = null; AutoWebProxyScriptWrapper scriptInstance = null; ExceptionHelper.WebPermissionUnrestricted.Assert(); try { lock (this.lockObject) { if (this.aborted) { throw new WebException(NetRes.GetWebStatusString("net_requestaborted", WebExceptionStatus.RequestCanceled), WebExceptionStatus.RequestCanceled); } this.request = WebRequest.Create(location); } this.request.Timeout = -1; this.request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.Default); this.request.ConnectionGroupName = "__WebProxyScript"; if (this.request.CacheProtocol != null) { this.request.CacheProtocol = new RequestCacheProtocol(this.backupCache, this.request.CacheProtocol.Validator); } HttpWebRequest request = this.request as HttpWebRequest; if (request != null) { request.Accept = "*/*"; request.UserAgent = base.GetType().FullName + "/" + Environment.Version; request.KeepAlive = false; request.Pipelined = false; request.InternalConnectionGroup = true; } else { FtpWebRequest request2 = this.request as FtpWebRequest; if (request2 != null) { request2.KeepAlive = false; } } this.request.Proxy = null; this.request.Credentials = base.Engine.Credentials; if (timerQueue == null) { timerQueue = TimerThread.GetOrCreateQueue(SettingsSectionInternal.Section.DownloadTimeout); } timer = timerQueue.CreateTimer(timerCallback, this.request); response = this.request.GetResponse(); DateTime minValue = DateTime.MinValue; HttpWebResponse response2 = response as HttpWebResponse; if (response2 != null) { minValue = response2.LastModified; } else { FtpWebResponse response3 = response as FtpWebResponse; if (response3 != null) { minValue = response3.LastModified; } } if (((this.scriptInstance != null) && (minValue != DateTime.MinValue)) && (this.scriptInstance.LastModified == minValue)) { scriptInstance = this.scriptInstance; downloadFailure = BaseWebProxyFinder.AutoWebProxyState.Completed; } else { string scriptBody = null; byte[] buffer = null; using (Stream stream = response.GetResponseStream()) { SingleItemRequestCache.ReadOnlyStream stream2 = stream as SingleItemRequestCache.ReadOnlyStream; if (stream2 != null) { buffer = stream2.Buffer; } if (((this.scriptInstance != null) && (buffer != null)) && (buffer == this.scriptInstance.Buffer)) { this.scriptInstance.LastModified = minValue; scriptInstance = this.scriptInstance; downloadFailure = BaseWebProxyFinder.AutoWebProxyState.Completed; } else { using (StreamReader reader = new StreamReader(stream)) { scriptBody = reader.ReadToEnd(); } } } WebResponse response4 = response; response = null; response4.Close(); timer.Cancel(); timer = null; if (downloadFailure != BaseWebProxyFinder.AutoWebProxyState.Completed) { if ((this.scriptInstance != null) && (scriptBody == this.scriptInstance.ScriptBody)) { this.scriptInstance.LastModified = minValue; if (buffer != null) { this.scriptInstance.Buffer = buffer; } scriptInstance = this.scriptInstance; downloadFailure = BaseWebProxyFinder.AutoWebProxyState.Completed; } else { scriptInstance = new AutoWebProxyScriptWrapper { LastModified = minValue }; if (scriptInstance.Compile(location, scriptBody, buffer)) { downloadFailure = BaseWebProxyFinder.AutoWebProxyState.Completed; } else { downloadFailure = BaseWebProxyFinder.AutoWebProxyState.CompilationFailure; } } } } } catch (Exception exception) { if (Logging.On) { Logging.PrintWarning(Logging.Web, SR.GetString("net_log_proxy_script_download_compile_error", new object[] { exception })); } } finally { if (timer != null) { timer.Cancel(); } try { if (response != null) { response.Close(); } } finally { CodeAccessPermission.RevertAssert(); this.request = null; } } if ((downloadFailure == BaseWebProxyFinder.AutoWebProxyState.Completed) && (this.scriptInstance != scriptInstance)) { if (this.scriptInstance != null) { this.scriptInstance.Close(); } this.scriptInstance = scriptInstance; } return(downloadFailure); }