[Fat-develop] FAT/src/FAT.Web/HtmlDetails HtmlDetailsEnhancer.cs,1.1,1.2

[<dmc...@pr...>]

Update of /cvsroot/fat/FAT/src/FAT.Web/HtmlDetails
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv18067/src/FAT.Web/HtmlDetails

Modified Files:
	HtmlDetailsEnhancer.cs 
Log Message:
Relative urls in html is now expanded so that <img src="url" >, <a href="url" >, <form action="url" > etc. work in thumbnail creation and in IE pop-up when thumbnail is clicked. Introduced "view source" link so that original, unmodified html source is still accessible.

Index: HtmlDetailsEnhancer.cs
===================================================================
RCS file: /cvsroot/fat/FAT/src/FAT.Web/HtmlDetails/HtmlDetailsEnhancer.cs,v
retrieving revision 1.1
retrieving revision 1.2
diff -C2 -d -r1.1 -r1.2
*** HtmlDetailsEnhancer.cs	28 Jan 2004 22:14:49 -0000	1.1
--- HtmlDetailsEnhancer.cs	1 Feb 2004 12:27:15 -0000	1.2
***************
*** 1,3 ****
--- 1,4 ----
  using System;
+ using System.Text.RegularExpressions;
  using System.Drawing;
  using System.IO;
***************
*** 8,12 ****
  	public class HtmlDetailsEnhancer
  	{
! 		private const int screenWidth = 1400;
  		private const int screenHeight = 1050;
  		private const int scalingFactor = 8;
--- 9,13 ----
  	public class HtmlDetailsEnhancer
  	{
! 		private const int screenWidth = 1050;
  		private const int screenHeight = 1050;
  		private const int scalingFactor = 8;
***************
*** 35,40 ****
  		public string HtmlWithAbsoluteUrls
  		{
! 			// TODO: expand all urls in the html to be absolute url so that the page functions correctly (in most cases) when fetched from the FAT site.
! 			get {return html;}
  		}
  
--- 36,52 ----
  		public string HtmlWithAbsoluteUrls
  		{
! 			// here we expand urls in the html to be absolute urls so that the page functions correctly when
! 			// fetched from the FAT site or when viewed as a thumbnail. This means expanding relative urls to be
! 			// absolute for all <img src="">, <form action="">, <a href=""> etc.
! 			// it's not perfect - just good enough - urls embedded in javascript etc. are not caught,
! 			// RegExes works only where attribute values is enclosed in "".
! 			get 
! 			{
! 				string expandingHtml = html;
! 				expandingHtml = ExpandRelativeUrls(expandingHtml, "form", "action");
! 				expandingHtml = ExpandRelativeUrls(expandingHtml, "img", "src");
! 				expandingHtml = ExpandRelativeUrls(expandingHtml, "a", "img");
! 				return expandingHtml;
! 			}
  		}
  
***************
*** 44,51 ****
  		}
  
  		private Image CreateImage()
  		{
  			string temporaryFileName = GetTemporaryFileName();
! 			WriteHtmlToFile(temporaryFileName);
  			Image image = CreateImageFromFile(temporaryFileName);
  			DeleteTemporaryFile(temporaryFileName);
--- 56,83 ----
  		}
  
+ 		public string UrlRoot {	get { return Regex.Replace(url, "(http://.*)/.*$", "$1"); }}
+ 		public string UrlHost {	get { return Regex.Replace(url, "(http://.*?)/.*", "$1"); }}
+ 
+ 		private string ExpandRelativeUrls(string html, string element, string attribute)
+ 		{
+ 			return ExpandHostRelativeUrls(ExpandFolderRelativeUrls(html, element, attribute), element, attribute);
+ 		}
+ 
+ 		private string ExpandFolderRelativeUrls(string html, string element, string attribute)
+ 		{
+ 			// Example: Default.aspx => http://localhost/FAT.Web/Default.aspx
+ 			return Regex.Replace(html, "(<" + element + " .*?" + attribute + @"\s*=\s*"")((?(http://|/)no).*?"".*?>)", "$1" + UrlRoot + "/$2", RegexOptions.Singleline);
+ 		}
+ 
+ 		private string ExpandHostRelativeUrls(string html, string element, string attribute)
+ 		{
+ 			// Example: /FAT.Web/Default.aspx => http://localhost/FAT.Web/Default.aspx
+ 			return Regex.Replace(html, "(<" + element + " .*?" + attribute + @"\s*=\s*"")((?(http://)no).*?"".*?>)", "$1" + UrlHost + "$2", RegexOptions.Singleline);
+ 		}
+ 
  		private Image CreateImage()
  		{
  			string temporaryFileName = GetTemporaryFileName();
! 			WriteHtmlWithAbsoluteUrlsToFile(temporaryFileName);
  			Image image = CreateImageFromFile(temporaryFileName);
  			DeleteTemporaryFile(temporaryFileName);
***************
*** 58,65 ****
  		}
  
! 		private void WriteHtmlToFile(string fileName)
  		{
  			StreamWriter writer = new StreamWriter(fileName);
! 			writer.Write(html);
  			writer.Close();
  		}
--- 90,97 ----
  		}
  
! 		private void WriteHtmlWithAbsoluteUrlsToFile(string fileName)
  		{
  			StreamWriter writer = new StreamWriter(fileName);
! 			writer.Write(HtmlWithAbsoluteUrls);
  			writer.Close();
  		}