299 lines
9.0 KiB
C#
299 lines
9.0 KiB
C#
//
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// ScriptResourceHandler.cs
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//
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// Authors:
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// Igor Zelmanovich <igorz@mainsoft.com>
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// Marek Habersack <grendel@twistedcode.net>
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//
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// (C) 2007 Mainsoft, Inc. http://www.mainsoft.com
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// (C) 2011 Novell, Inc. http://novell.com
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using System.Security.Cryptography;
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using System.Reflection;
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using System.Resources;
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using System.Text;
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using System.Threading;
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using System.Web.Configuration;
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using System.Web.Hosting;
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using System.Web.UI;
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using System.Web.Util;
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namespace System.Web.Handlers
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{
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public partial class ScriptResourceHandler : IHttpHandler
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{
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protected virtual bool IsReusable {
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get { return true; }
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}
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#region IHttpHandler Members
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bool IHttpHandler.IsReusable {
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get { return IsReusable; }
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}
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void IHttpHandler.ProcessRequest (HttpContext context) {
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ProcessRequest (context);
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}
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#endregion
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void AppendResourceScriptContents (StringWriter sw, CompositeEntry entry)
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{
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if (entry.Assembly == null || entry.Attribute == null || String.IsNullOrEmpty (entry.NameOrPath))
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return;
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using (Stream s = entry.Assembly.GetManifestResourceStream (entry.NameOrPath)) {
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if (s == null)
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throw new HttpException (404, "Resource '" + entry.NameOrPath + "' not found");
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if (entry.Attribute.PerformSubstitution) {
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using (var r = new StreamReader (s)) {
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new PerformSubstitutionHelper (entry.Assembly).PerformSubstitution (r, sw);
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}
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} else {
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using (var r = new StreamReader (s)) {
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string line = r.ReadLine ();
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while (line != null) {
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sw.WriteLine (line);
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line = r.ReadLine ();
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}
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}
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}
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}
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}
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void AppendFileScriptContents (StringWriter sw, CompositeEntry entry)
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{
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// FIXME: should we limit the script size in any way?
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if (String.IsNullOrEmpty (entry.NameOrPath))
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return;
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string mappedPath;
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if (!HostingEnvironment.HaveCustomVPP) {
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// We'll take a shortcut here by bypassing the default VPP layers
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mappedPath = HostingEnvironment.MapPath (entry.NameOrPath);
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if (!File.Exists (mappedPath))
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return;
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sw.Write (File.ReadAllText (mappedPath));
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return;
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}
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VirtualPathProvider vpp = HostingEnvironment.VirtualPathProvider;
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if (!vpp.FileExists (entry.NameOrPath))
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return;
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VirtualFile file = vpp.GetFile (entry.NameOrPath);
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if (file == null)
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return;
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using (Stream s = file.Open ()) {
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using (var r = new StreamReader (s)) {
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string line = r.ReadLine ();
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while (line != null) {
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sw.WriteLine (line);
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line = r.ReadLine ();
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}
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}
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}
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}
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void AppendScriptContents (StringWriter sw, CompositeEntry entry)
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{
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if (entry.Assembly != null)
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AppendResourceScriptContents (sw, entry);
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else
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AppendFileScriptContents (sw, entry);
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}
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void SendCompositeScript (HttpContext context, HttpRequest request, bool notifyScriptLoaded, List <CompositeEntry> entries)
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{
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if (entries.Count == 0)
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throw new HttpException (404, "Resource not found");
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DateTime modifiedSince;
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bool hasIfModifiedSince = HasIfModifiedSince (context.Request, out modifiedSince);
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if (hasIfModifiedSince) {
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bool notModified = true;
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foreach (CompositeEntry entry in entries) {
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if (entry == null)
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continue;
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if (notModified) {
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if (hasIfModifiedSince && entry.IsModifiedSince (modifiedSince))
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notModified = false;
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}
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}
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if (notModified) {
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RespondWithNotModified (context);
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return;
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}
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}
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StringBuilder contents = new StringBuilder ();
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using (var sw = new StringWriter (contents)) {
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foreach (CompositeEntry entry in entries) {
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if (entry == null)
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continue;
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AppendScriptContents (sw, entry);
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}
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}
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if (contents.Length == 0)
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throw new HttpException (404, "Resource not found");
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HttpResponse response = context.Response;
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DateTime utcnow = DateTime.UtcNow;
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response.ContentType = "text/javascript";
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response.Headers.Add ("Last-Modified", utcnow.ToString ("r"));
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response.ExpiresAbsolute = utcnow.AddYears (1);
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response.CacheControl = "public";
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response.Output.Write (contents.ToString ());
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if (notifyScriptLoaded)
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OutputScriptLoadedNotification (response.Output);
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}
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void OutputScriptLoadedNotification (TextWriter writer)
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{
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writer.WriteLine ();
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writer.WriteLine ("if(typeof(Sys)!=='undefined')Sys.Application.notifyScriptLoaded();");
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}
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protected virtual void ProcessRequest (HttpContext context)
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{
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HttpRequest request = context.Request;
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bool notifyScriptLoaded = request.QueryString ["n"] == "t";
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List <CompositeEntry> compositeEntries = CompositeScriptReference.GetCompositeScriptEntries (request.RawUrl);
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if (compositeEntries != null) {
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SendCompositeScript (context, request, notifyScriptLoaded, compositeEntries);
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return;
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}
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EmbeddedResource res;
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Assembly assembly;
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SendEmbeddedResource (context, out res, out assembly);
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HttpResponse response = context.Response;
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TextWriter writer = response.Output;
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foreach (ScriptResourceAttribute sra in assembly.GetCustomAttributes (typeof (ScriptResourceAttribute), false)) {
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if (String.Compare (sra.ScriptName, res.Name, StringComparison.Ordinal) == 0) {
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string scriptResourceName = sra.ScriptResourceName;
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ResourceSet rset = null;
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try {
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rset = new ResourceManager (scriptResourceName, assembly).GetResourceSet (Threading.Thread.CurrentThread.CurrentUICulture, true, true);
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}
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catch (MissingManifestResourceException) {
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if (scriptResourceName.EndsWith (".resources", RuntimeHelpers.StringComparison)) {
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scriptResourceName = scriptResourceName.Substring (0, scriptResourceName.Length - 10);
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rset = new ResourceManager (scriptResourceName, assembly).GetResourceSet (Threading.Thread.CurrentThread.CurrentUICulture, true, true);
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}
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else
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throw;
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}
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if (rset == null)
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break;
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writer.WriteLine ();
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string ns = sra.TypeName;
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int indx = ns.LastIndexOf ('.');
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if (indx > 0)
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writer.WriteLine ("Type.registerNamespace('" + ns.Substring (0, indx) + "')");
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writer.Write ("{0}={{", sra.TypeName);
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bool first = true;
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foreach (DictionaryEntry de in rset) {
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string value = de.Value as string;
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if (value != null) {
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if (first)
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first = false;
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else
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writer.Write (',');
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writer.WriteLine ();
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writer.Write ("{0}:{1}", GetScriptStringLiteral ((string) de.Key), GetScriptStringLiteral (value));
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}
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}
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writer.WriteLine ();
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writer.WriteLine ("};");
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break;
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}
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}
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if (notifyScriptLoaded)
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OutputScriptLoadedNotification (writer);
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}
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static void CheckIfResourceIsCompositeScript (string resourceName, ref bool includeTimeStamp)
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{
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bool isCompositeScript = resourceName.StartsWith (CompositeScriptReference.COMPOSITE_SCRIPT_REFERENCE_PREFIX, StringComparison.Ordinal);
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if (!isCompositeScript)
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return;
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includeTimeStamp = false;
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}
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bool HandleCompositeScriptRequest (HttpContext context, HttpRequest request, string d)
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{
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return false;
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}
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// TODO: add value cache?
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static string GetScriptStringLiteral (string value)
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{
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if (String.IsNullOrEmpty (value))
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return "\"" + value + "\"";
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var sb = new StringBuilder ("\"");
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for (int i = 0; i < value.Length; i++) {
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char ch = value [i];
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switch (ch) {
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case '\'':
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sb.Append ("\\u0027");
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break;
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case '"':
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sb.Append ("\\\"");
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break;
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case '\\':
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sb.Append ("\\\\");
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break;
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case '\n':
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sb.Append ("\\n");
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break;
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case '\r':
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sb.Append ("\\r");
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break;
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default:
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sb.Append (ch);
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break;
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}
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}
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sb.Append ("\"");
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return sb.ToString ();
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}
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}
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}
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