ASP.NET MVC RedirectUrl on Login

by Tyler Jensen 17. September 2008 14:20

In my first attempt at creating a real applicaiton using the new ASP.NET MVC project template (Codeplex Preview 5), I found that when I clicked a new tab I'd created linked to a specific controller and an action I'd decorated with the [Authorize(Roles = "user")] attribute, the "out of the box" Login action did not redirect me to the that controller/action combo once I had successfully logged in.

Here's my solution to the problem. First, I added a hidden value in the Login.aspx form. Second, I added a parameter to the Login action in the Acount controller (AccountController.cs). Let me know if you've found a better way.

Here's the code for the form:

<form method="post" action="<%= Html.AttributeEncode(Url.Action("Login")) %>">
    <div>
        <table>
            <tr>
                <td>
                    Username:
                </td>
                <td>
                    <%= Html.TextBox("username") %>
                </td>
            </tr>
            <tr>
                <td>
                    Password:
                </td>
                <td>
                    <%= Html.Password("password") %>
                </td>
            </tr>
            <tr>
                <td>
                </td>
                <td>
                    <input type="checkbox" name="rememberMe" value="true" />
                    Remember me?
                </td>
            </tr>
            <tr> <!-- Added to handle the returnUrl -->
                <td>
                    <%= Html.Hidden("returnUrl", ViewData["ReturnUrl"].ToString()) %>
                </td>
                <td>
                    <input type="submit" value="Login" />
                </td>
            </tr>
        </table>
    </div>
</form>

Here's the code for the Login action:

public ActionResult Login(string username, string password, bool? rememberMe, string returnUrl)
{
    ViewData["Title"] = "Login";
    string url = (string.IsNullOrEmpty(returnUrl) 
        ? Request.QueryString["ReturnUrl"] ?? string.Empty 
        : returnUrl)
        .Trim('/');
    ViewData["ReturnUrl"] = url;

    // Non-POST requests should just display the Login form 
    if (Request.HttpMethod != "POST")
    {
        return View();
    }

    // Basic parameter validation
    List<string> errors = new List<string>();

    if (String.IsNullOrEmpty(username))
    {
        errors.Add("You must specify a username.");
    }

    if (errors.Count == 0)
    {

        // Attempt to login
        bool loginSuccessful = Provider.ValidateUser(username, password);

        if (loginSuccessful)
        {
            FormsAuth.SetAuthCookie(username, rememberMe ?? false);
            if (url != null && url.Length > 0)
                return RedirectToAction("Index", url);
            else
                return RedirectToAction("Index", "Home");
        }
        else
        {
            errors.Add("The username or password provided is incorrect.");
        }
    }

    // If we got this far, something failed, redisplay form
    ViewData["errors"] = errors;
    ViewData["username"] = username;
    return View();
}

Tags:

Code

Taking a Comment Holiday to Escape the Spammers

by Tyler Jensen 12. September 2008 04:29

I upgraded to the latest version of dasBlog a few days ago and inadvertently allowed comments without requiring approval. A spambot comment got through and while I quickly turned on the "require approval" feature, it was too late. Since then I've been bombarded with stupid link spam comments. I even deleted the one post that seemed to be the bot target and created a new post with the same content.

No luck. After many similar spam comments today being posted to the most recent post on my blog, I'm giving up. I'm taking a comment holiday. It won't bother anyone really because I don't get many real comments. I'll enable the comment functionality some day in the future.

Meantime, if you have a comment, feel free to email me and I'll post it as an addendum to the relevant post.

Tags:

Commentary

Live Writer Source Code Format Plugin

by Tyler Jensen 9. September 2008 18:22

I've just installed the plugin blogged about by Mike Ormond and here's an example of it's output taken from code in the Atrax project I've just published to Codeplex.

namespace Atrax.Library
{
   [DataContract, Serializable]
   public class QueryResult
   {
      /// <summary>
      /// The original query sent by the client.
      /// </summary>
      [DataMember]
      public Query Query { get; set; }

      /// <summary>
      /// Status code sent back to query client's callback url.
      /// </summary>
      [DataMember]
      public string StatusCode { get; set; }
      
      /// <summary>
      /// Status description sent back to query client's callback url.
      /// </summary>
      [DataMember]
      public string StatusDescription { get; set; }
      
      /// <summary>
      /// The XML schema for the result XML.
      /// </summary>
      [DataMember]
      public string ResultSchema { get; set; }

      /// <summary>
      /// The result produced by the query processor, usually XML.
      /// </summary>
      [DataMember]
      public string Result { get; set; }
   }
}

Tags:

Code

Testing Windows Live Writer with dasBlog

by Tyler Jensen 8. September 2008 22:05

I've run into a little snag with my blog. I installed (rather copied) the latest release of dasblog to my bin (and other directories) and ended up not being able to edit or post new blog entries because of some installation (probably some config) issue with FreeTextBox. So while I figure out the problem or wait for someone else to solve it, I decided to try Windows Live Writer.

Here's the FreeTextBox and the text it displays now when attempting to edit or add a post:

I've tried the web.config change, including the one suggested by Scott Hanselman regarding the dependent assembly as follows:

<dependentAssembly>
    <assemblyIdentity name="FreeTextBox" publicKeyToken="5962a4e684a48b87" culture="neutral"/>
    <bindingRedirect oldVersion="3.0.5000.0-3.0.5000.6" newVersion="3.1.6.34851"/>
</dependentAssembly>

Well, time to publish this to see what it looks like.

(And second post with some edits.)

Tags:

Atrax Keyword Extraction Algorithm

by Tyler Jensen 7. September 2008 20:12

Two and a half years ago I wrote an implementation in C# of an algorithm published in 2003 in a short academic paper by Yutaka Matsuo and Mitsuru Ishizuka in the International Journal of Artificial Intelligence Tools. Of course, the algorithm is not a perfect implementation of the algorithm published in the "Keyword Extraction from a Single Document using Word Co-occurrence Statistical Information" paper. I made a number of decisions to make the algorithm as effective as possible while keeping it as fast as I could.

The code was written for Provo Labs, my employer at the time. I've recently obtained written permission from Provo Labs to release this code as open source under the Apache 2.0 license. You can get the code in the Atrax.Html project, a part of the entire Atrax project which I've just released, at http://www.codeplex.com/atrax. Here's the core of the code.

string[] terms = new string[termsG.Count];
termsG.Values.CopyTo(terms, 0); //gives terms array where last term is the MAX g in G
foreach (string w in terms)
{
    decimal sumZ = 0;
    for (int i = 0; i < terms.Length - 1; i++) //do calcs for all but MAX
    {
        string g = terms[i];
        if (w != g) //skip where on the diagonal
        {
            int nw = termNw[w];
            decimal Pg = termPg[g];
            decimal D = nw * Pg;
            if (D != 0.0m)
            {
                decimal Fwg = termFwg[w][terms[i]];
                decimal T = Fwg - D;
                decimal Z = (T * T) / D;
                sumZ += Z;
            }
        }
    }
    termsX2[w] = sumZ;
}

SortedDictionary<decimal, string> sortedX2 = new SortedDictionary<decimal, string>();
foreach (KeyValuePair<string, decimal> pair in termsX2)
{
    decimal x2 = pair.Value;
    while (sortedX2.ContainsKey(x2))
    {
        x2 = x2 - 0.00001m;
    }
    sortedX2.Add(x2, pair.Key);
}

//now get simple array of values as lowest to highest X2 terms
string[] x2Terms = new string[sortedX2.Count];
sortedX2.Values.CopyTo(x2Terms, 0);

I have not spent much time on this algorithm in the past two years and would like to find others with similar interests to help me improve and perfect it. If you have an interest in this kind of research, please join me at the Atrax project page on Codeplex.

Tags:

Code

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Tyler Jensen

Tyler Jensen
.NET Developer and Architect

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