conditional url re writing - UI Questions

Dan Pollack 1 post 21 karma points

Jul 28, 2011 @ 16:34

Conditional URL re-writing

Hello, I am new to this forum. I am trying to do a conditional URL re-write (the user will be redirected to http://{site}/{web or mobile or text}/{state}/{county} in Umbraco using the Urlrewriting.config and possibly the Umbraco C# Razor API. I know how to do Url re-writing, but for the life of me cannot figure out how to do conditional re-writes based on the client (user's OS). I'm trying to do this without using any type of re-directing at all whatsoever. Any thoughts?

I added the following configuration node to the Urlrewriting.config file.

<add name="countyrewrite"

virtualUrl="^~/(.*)/(.*)/\?(.*)"

rewriteUrlParameter="IncludeQueryStringForRewrite"

rule.Rewrite = "RewriteOption.Application"

destinationUrl="~/web.aspx?state=$1&county=$2&$3"

ignoreCase="true" />

This works to redirect to the web.aspx page. However, there needs to be a way for the user agent to determine the OS platform.

I attempted to use the UrlRewritingNet library and create a “Browser Redirect” Scripting file. This file is written with Razor and attempts to re-write the above rule based on the platform detected. See Below:

if (Request.Browser["IsMobileDevice"] == "true" || Request.Browser["BlackBerry"] == "true" )
  {
  RegExRewriteRule rule;
  rule = new RegExRewriteRule();
  rule.VirtualUrl = @"^~/(.*)/(.*)/\?(.*)";
  rule.DestinationUrl = "~/mobile.aspx?state=$1&county=$2&$3";
  rule.IgnoreCase = true;
  rule.Rewrite = RewriteOption.Application;
  rule.RewriteUrlParameter = RewriteUrlParameterOption.IncludeQueryStringForRewrite;
  UrlRewriting.ReplaceRewriteRule("countyrewrite", rule);
  }
  else
  {

  RegExRewriteRule rule;
  rule = new RegExRewriteRule();
  rule.VirtualUrl = @"^~/(.*)/(.*)/\?(.*)";
  rule.DestinationUrl = "~/web.aspx?state=$1&county=$2&$3";
  rule.IgnoreCase = true;
  rule.Rewrite = RewriteOption.Application;

  rule.RewriteUrlParameter = RewriteUrlParameterOption.IncludeQueryStringForRewrite;
  UrlRewriting.ReplaceRewriteRule("countyrewrite", rule);
  }

I had a hunch that this would not work because of the page loading sequence. I have some ideas involving Server.Transfer, but maybe there are some other options.

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Waylon Martinez 12 posts 37 karma points

Jul 29, 2011 @ 02:37

You can easily create your own custom urlrewriting provider - they are very easy to make then you will have the ability to do something like this.

<add name="RewriteByBrowerType"
   provider="BrowserTypeProvider"
      virtualUrl="^~/(.*)/(.*)/\?(.*)"
     rewriteUrlParameter="ExcludeFromClientQueryString"
      destinationUrl="/{0}.aspx?state=$1&county=$2&$3"
      ignoreCase="true" encoding="true"

/>

public class BrowserTypeProvider: UrlRewritingProvider
    {
        public static void SetFormPostbackOverrideTo(string overridePostBackUrl)
        {
            var context = HttpContext.Current;
            if(context.Items.Contains(UrlRewrittingActionOverrideContextKey))
            {
                context.Items.Remove(UrlRewrittingActionOverrideContextKey);

            }

                context.Items.Add(UrlRewrittingActionOverrideContextKey,overridePostBackUrl);

        }

        public override RewriteRule CreateRewriteRule()
        {
            var context = HttpContext.Current;
            return new BrowserTypeProviderRule(context);
        }
    }

    public class BrowserTypeProviderRule: RegExRewriteRule
    {
        private Regex regex;
        privat HttpContext context;

        public BrowserTypeProviderRule(HttpContext context)
        {
           this.context = context;
            UrlHelper urlHelper = new UrlHelper();
            if (IgnoreCase)
            {
                regex = new Regex(urlHelper.HandleRootOperator(VirtualUrl),
                RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions);
            }
            else
            {
                regex = new Regex(urlHelper.HandleRootOperator(VirtualUrl),
                RegexOptions.Compiled | RegexOptions);
            }
        }

        public override string RewriteUrl(string url)
        {
           var page= (context.Request.Browser["IsMobileDevice"] == "true" || context.Request.Browser["BlackBerry"] == "true") ? "mobile" : "web";

DestinationUrl = String.Format(DestinationUrl, page); //since we added the "{0}" in the destination url this will allow you to use the string.format

var rUrl = Regex.Replace(url, VirtualUrl, delegate(Match match)
                                                    {
                                                        string returnUrl = DestinationUrl;

                                                        for (int i = 1; i < match.Groups.Count; i++)
                                                        {
                                                            returnUrl = Regex.Replace(returnUrl, "(\\" + "$" + i + "\\b)", HttpUtility.UrlEncode(match.Groups[i].ToString().Replace("+", " "))); //Note: Added the .Replace("+", " ") because it seems that when a request came in with a converted " " to "+" the server wouldn't resolve the request
                                                        }

                                                        return returnUrl;
                                                    });

            return rUrl;
        }


    }
}

Hopefully this will work as i described it - i typed the code into the WYSIWYG so therer might be some typeos and possible code errors - i appologize in advance.

I would love to see if that worked for you.

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Waylon Martinez 12 posts 37 karma points

Jul 29, 2011 @ 02:41

Of course just incase it isn't implied you will have to create your own code assembly to house this example then move the library into the bin.

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Waylon Martinez 12 posts 37 karma points

Aug 12, 2011 @ 18:12

@Dan Pollack Did that work?

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Conditional URL re-writing