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using System.Configuration;
using System.Diagnostics;
using System.Text.RegularExpressions;
using System.Web;
using System.Xml;
// nicked from http://www.codeproject.com/aspnet/URLRewriter.asp
namespace ProviderPortal {
public class URLRewriter : IConfigurationSectionHandler {
public static log4net.ILog Logger = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
protected XmlNode _oRules = null;
protected URLRewriter() { }
public string GetSubstitution(string zPath) {
Regex oReg;
foreach (XmlNode oNode in _oRules.SelectNodes("rule")) {
// get the url and rewrite nodes
XmlNode oUrlNode = oNode.SelectSingleNode("url");
XmlNode oRewriteNode = oNode.SelectSingleNode("rewrite");
// check validity of the values
if (oUrlNode == null || string.IsNullOrEmpty(oUrlNode.InnerText)
|| oRewriteNode == null || string.IsNullOrEmpty(oRewriteNode.InnerText)) {
Logger.Warn("Invalid urlrewrites rule discovered in web.config file.");
continue;
}
oReg = new Regex(oUrlNode.InnerText, RegexOptions.IgnoreCase);
// if match, return the substitution
Match oMatch = oReg.Match(zPath);
if (oMatch.Success) {
return oReg.Replace(zPath, oRewriteNode.InnerText);
}
}
return null; // no rewrite
}
public static void Process() {
URLRewriter oRewriter = (URLRewriter)System.Configuration.ConfigurationManager.GetSection("urlrewrites");
string zSubst = oRewriter.GetSubstitution(HttpContext.Current.Request.Path);
if (!string.IsNullOrEmpty(zSubst)) {
Logger.InfoFormat("Rewriting url '{0}' to '{1}' ", HttpContext.Current.Request.Path, zSubst);
HttpContext.Current.RewritePath(zSubst);
}
}
#region Implementation of IConfigurationSectionHandler
public object Create(object parent, object configContext, XmlNode section) {
_oRules = section;
return this;
}
#endregion
}
}
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