7455e8f05a
More ClientDependency work...converting script and link tags slowly, debug is now off so compression is working. [TFS Changeset #56602]
268 lines
8.1 KiB
C#
268 lines
8.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using umbraco.presentation.ClientDependency.Config;
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using System.IO;
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using System.Web;
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using System.Net;
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using System.IO.Compression;
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namespace umbraco.presentation.ClientDependency
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{
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public enum CompressionType
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{
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deflate, gzip, none
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}
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/// <summary>
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/// A utility class for combining, compressing and saving composite scripts/css files
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/// </summary>
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public static class CompositeFileProcessor
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{
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/// <summary>
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/// Saves the file's bytes to disk with a hash of the byte array
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/// </summary>
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/// <param name="fileContents"></param>
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/// <param name="type"></param>
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/// <returns>The new file path</returns>
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/// <remarks>
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/// the extension will be: .cdj for JavaScript and .cdc for CSS
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/// </remarks>
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public static string SaveCompositeFile(byte[] fileContents, ClientDependencyType type)
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{
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if (!ClientDependencySettings.Instance.CompositeFilePath.Exists)
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ClientDependencySettings.Instance.CompositeFilePath.Create();
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FileInfo fi = new FileInfo(
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Path.Combine(ClientDependencySettings.Instance.CompositeFilePath.FullName,
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fileContents.GetHashCode().ToString() + ".cd" + type.ToString().Substring(0, 1).ToLower()));
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if (fi.Exists)
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fi.Delete();
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FileStream fs = fi.Create();
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fs.Write(fileContents, 0, fileContents.Length);
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fs.Close();
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return fi.FullName;
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}
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/// <summary>
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/// combines all files to a byte array
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/// </summary>
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/// <param name="fileList"></param>
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/// <param name="context"></param>
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/// <returns></returns>
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public static byte[] CombineFiles(string[] strFiles, HttpContext context, ClientDependencyType type)
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{
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MemoryStream ms = new MemoryStream(5000);
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StreamWriter sw = new StreamWriter(ms);
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foreach (string s in strFiles)
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{
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if (!string.IsNullOrEmpty(s))
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{
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try
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{
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FileInfo fi = new FileInfo(context.Server.MapPath(s));
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if (ClientDependencySettings.Instance.FileBasedDependencyExtensionList.Contains(fi.Extension.ToLower().Replace(".", "")))
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{
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//if the file doesn't exist, then we'll assume it is a URI external request
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if (!fi.Exists)
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{
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WriteFileToStream(ref sw, s, type);
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}
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else
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{
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WriteFileToStream(ref sw, fi, type, s);
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}
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}
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else
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{
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//if it's not a file based dependency, try to get the request output.
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WriteFileToStream(ref sw, s, type);
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}
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}
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catch (Exception ex)
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{
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Type exType = ex.GetType();
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if (exType.Equals(typeof(NotSupportedException)) || exType.Equals(typeof(ArgumentException)))
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{
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//could not parse the string into a fileinfo, so we assume it is a URI
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WriteFileToStream(ref sw, s, type);
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}
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else
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{
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//if this fails, log the exception in trace, but continue
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HttpContext.Current.Trace.Warn("ClientDependency", "Could not load file contents from " + s, ex);
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System.Diagnostics.Debug.Assert(false, "Could not load file contents from " + s, ex.Message);
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}
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}
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}
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if (type == ClientDependencyType.Javascript)
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{
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sw.Write(";;;"); //write semicolons in case the js isn't formatted correctly. This also helps for debugging.
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}
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}
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sw.Flush();
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byte[] outputBytes = ms.ToArray();
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sw.Close();
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ms.Close();
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return outputBytes;
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}
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/// <summary>
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/// Writes the output of an external request to the stream. Returns true/false if succesful or not.
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/// </summary>
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/// <param name="sw"></param>
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/// <param name="url"></param>
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/// <returns></returns>
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private static bool WriteFileToStream(ref StreamWriter sw, string url, ClientDependencyType type)
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{
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string requestOutput;
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bool rVal = false;
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rVal = TryReadUri(url, out requestOutput);
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if (rVal)
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{
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//write the contents of the external request.
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sw.WriteLine(ParseFileContents(requestOutput, type, url));
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}
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return rVal;
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}
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private static bool WriteFileToStream(ref StreamWriter sw, FileInfo fi, ClientDependencyType type, string origUrl)
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{
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try
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{
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//if it is a file based dependency then read it
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string fileContents = File.ReadAllText(fi.FullName);
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sw.WriteLine(ParseFileContents(fileContents, type, origUrl));
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return true;
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}
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catch (Exception ex)
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{
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HttpContext.Current.Trace.Warn("ClientDependency", "Could not write file " + fi.FullName + " contents to stream", ex);
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System.Diagnostics.Debug.Assert(false, "Could not write file " + fi.FullName + " contents to stream", ex.Message);
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return false;
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}
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}
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/// <summary>
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/// Currently this only parses CSS files, but potentially could have other uses.
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/// This is the final process before writing to the stream.
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/// </summary>
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/// <param name="fileContents"></param>
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/// <param name="type"></param>
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/// <returns></returns>
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private static string ParseFileContents(string fileContents, ClientDependencyType type, string url)
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{
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//if it is a CSS file we need to parse the URLs
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if (type == ClientDependencyType.Css)
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{
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fileContents = CssFileUrlFormatter.TransformCssFile(fileContents, MakeUri(url));
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}
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return fileContents;
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}
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/// <summary>
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/// Checks if the url is a local/relative uri, if it is, it makes it absolute based on the
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/// current request uri.
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/// </summary>
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/// <param name="url"></param>
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/// <returns></returns>
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private static Uri MakeUri(string url)
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{
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Uri uri = new Uri(url, UriKind.RelativeOrAbsolute);
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if (!uri.IsAbsoluteUri)
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{
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string http = HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Authority);
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Uri absoluteUrl = new Uri(new Uri(http), uri);
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return absoluteUrl;
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}
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return uri;
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}
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/// <summary>
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/// Tries to convert the url to a uri, then read the request into a string and return it.
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/// This takes into account relative vs absolute URI's
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/// </summary>
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/// <param name="url"></param>
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/// <param name="requestContents"></param>
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/// <returns></returns>
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private static bool TryReadUri(string url, out string requestContents)
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{
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Uri uri;
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if (Uri.TryCreate(url, UriKind.RelativeOrAbsolute, out uri))
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{
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if (uri.IsAbsoluteUri)
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{
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WebClient client = new WebClient();
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try
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{
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requestContents = client.DownloadString(uri.AbsoluteUri);
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return true;
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}
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catch (Exception ex)
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{
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HttpContext.Current.Trace.Warn("ClientDependency", "Could not load file contents from " + url, ex);
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System.Diagnostics.Debug.Assert(false, "Could not load file contents from " + url, ex.Message);
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}
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}
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else
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{
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//its a relative path so use the execute method
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StringWriter sw = new StringWriter();
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try
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{
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HttpContext.Current.Server.Execute(url, sw);
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requestContents = sw.ToString();
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sw.Close();
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return true;
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}
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catch (Exception ex)
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{
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HttpContext.Current.Trace.Warn("ClientDependency", "Could not load file contents from " + url, ex);
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System.Diagnostics.Debug.Assert(false, "Could not load file contents from " + url, ex.Message);
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}
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}
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}
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requestContents = "";
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return false;
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}
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/// <summary>
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/// Compresses the bytes if the browser supports it
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/// </summary>
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public static byte[] CompressBytes(CompressionType type, byte[] fileBytes)
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{
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MemoryStream ms = new MemoryStream();
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Stream compressedStream = null;
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//deflate is faster in .Net according to Mads Kristensen (blogengine.net)
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if (type == CompressionType.deflate)
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{
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compressedStream = new DeflateStream(ms, CompressionMode.Compress, true);
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}
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else if (type == CompressionType.gzip)
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{
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compressedStream = new GZipStream(ms, CompressionMode.Compress, true);
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}
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if (type != CompressionType.none)
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{
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//write the bytes to the compressed stream
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compressedStream.Write(fileBytes, 0, fileBytes.Length);
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compressedStream.Close();
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byte[] output = ms.ToArray();
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ms.Close();
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return output;
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}
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//not compressed
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return fileBytes;
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}
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}
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}
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