//------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //------------------------------------------------------------------------------ namespace System.Web.Services.Discovery { using System; using System.IO; using System.Collections; using System.Web; using System.Xml; using System.Diagnostics; using System.ComponentModel; using System.Text; using System.Web.Services.Protocols; using System.Security; using System.Security.Permissions; using System.Web.Services.Diagnostics; /// /// /// [To be supplied.] /// public sealed class DiscoveryRequestHandler : IHttpHandler { /// /// /// [To be supplied.] /// public bool IsReusable { get { return true; } } /// /// /// [To be supplied.] /// public void ProcessRequest(HttpContext context) { TraceMethod method = Tracing.On ? new TraceMethod(this, "ProcessRequest") : null; if (Tracing.On) Tracing.Enter("IHttpHandler.ProcessRequest", method, Tracing.Details(context.Request)); new PermissionSet(PermissionState.Unrestricted).Demand(); // string cacheKey; string physicalPath = context.Request.PhysicalPath; if ( CompModSwitches.DynamicDiscoverySearcher.TraceVerbose ) Debug.WriteLine("DiscoveryRequestHandle: handling " + physicalPath); // Check to see if file exists locally. if (File.Exists(physicalPath)) { DynamicDiscoveryDocument dynDisco = null; FileStream stream = null; try { stream = new FileStream(physicalPath, FileMode.Open, FileAccess.Read); XmlTextReader xmlReader = new XmlTextReader(stream); xmlReader.WhitespaceHandling = WhitespaceHandling.Significant; xmlReader.XmlResolver = null; xmlReader.DtdProcessing = DtdProcessing.Prohibit; if (xmlReader.IsStartElement("dynamicDiscovery", DynamicDiscoveryDocument.Namespace)) { stream.Position = 0; dynDisco = DynamicDiscoveryDocument.Load(stream); } } finally { if (stream != null) { stream.Close(); } } if (dynDisco != null) { string[] excludeList = new string[dynDisco.ExcludePaths.Length]; string discoFileDirectory = Path.GetDirectoryName(physicalPath); string discoFileName = Path.GetFileName(physicalPath); for (int i = 0; i < excludeList.Length; i++) { // Exclude list now consists of relative paths, so this transformation not needed. // excludeList[i] = Path.Combine(discoFileDirectory, dynDisco.ExcludePaths[i].Path); excludeList[i] = dynDisco.ExcludePaths[i].Path; } // Determine start url path for search DynamicDiscoSearcher searcher; Uri searchStartUrl = context.Request.Url; string escapedUri = RuntimeUtils.EscapeUri(searchStartUrl); string searchStartUrlDir = GetDirPartOfPath( escapedUri ); // URL path without file name string strLocalPath = GetDirPartOfPath(searchStartUrl.LocalPath); if ( strLocalPath.Length == 0 || // no subdir present, host only CompModSwitches.DynamicDiscoveryVirtualSearch.Enabled // virtual search forced (for test suites). ) { discoFileName = GetFilePartOfPath( escapedUri ); searcher = new DynamicVirtualDiscoSearcher( discoFileDirectory, excludeList, searchStartUrlDir); } else searcher = new DynamicPhysicalDiscoSearcher(discoFileDirectory, excludeList, searchStartUrlDir); if ( CompModSwitches.DynamicDiscoverySearcher.TraceVerbose ) Debug.WriteLine( "*** DiscoveryRequestHandler.ProcessRequest() - startDir: " + searchStartUrlDir + " discoFileName :" + discoFileName); searcher.Search(discoFileName); DiscoveryDocument discoFile = searcher.DiscoveryDocument; MemoryStream memStream = new MemoryStream(1024); StreamWriter writer = new StreamWriter(memStream, new UTF8Encoding(false)); discoFile.Write(writer); memStream.Position = 0; byte[] data = new byte[(int)memStream.Length]; int bytesRead = memStream.Read(data, 0, data.Length); context.Response.ContentType = ContentType.Compose("text/xml", Encoding.UTF8); context.Response.OutputStream.Write(data, 0, bytesRead); } else { // Else, just return the disco file context.Response.ContentType = "text/xml"; context.Response.WriteFile(physicalPath); } if (Tracing.On) Tracing.Exit("IHttpHandler.ProcessRequest", method); return; } if (Tracing.On) Tracing.Exit("IHttpHandler.ProcessRequest", method); // Else, file is not found throw new HttpException(404, Res.GetString(Res.WebPathNotFound, context.Request.Path)); } // ------------------------------------------------------------------------- // Returns part of URL string to the left of the last slash. private static string GetDirPartOfPath(string str) { int lastSlash = str.LastIndexOf('/'); return (lastSlash > 0) ? str.Substring(0, lastSlash) : ""; } // ------------------------------------------------------------------------- // Returns part of URL string to the right of the last slash. private static string GetFilePartOfPath(string str) { int lastSlash = str.LastIndexOf('/'); if ( lastSlash < 0 ) return str; else if ( lastSlash == str.Length - 1 ) return ""; return str.Substring(lastSlash + 1); } } }