Exception while attempting to authenticate with OpenID

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1/26/2009 12:33:54 PM
arosca
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Exception while attempting to authenticate with OpenID

One of our users is receiving the following error when attempting to log in using OpenID (myopenid.com). What could be the issue?

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
mojoPortal.Web.OpenIdLoginControl.IsValidForUserCreation(OpenIdEventArgs e) +15
mojoPortal.Web.OpenIdLoginControl.DoNewUserLogic(OpenIdEventArgs e) +57
mojoPortal.Web.OpenIdLoginControl.OpenIdLogin1_LoggedIn(Object sender, OpenIdEventArgs e) +111
DotNetOpenId.RelyingParty.OpenIdTextBox.OnLoggedIn(IAuthenticationResponse response) +69
DotNetOpenId.RelyingParty.OpenIdTextBox.OnLoad(EventArgs e) +154
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

1/26/2009 1:38:20 PM
Joe Audette
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Re: Exception while attempting to authenticate with OpenID

I have seen this error from time to time but I'm not 100% sure the cause. One thing I would try is make sure the user is using lower case, someone else reported a problem something like this before and I think it was that he was using a mixed case url like Joe.Audette@myopenid.com instead of lower case (on linux urls are case sensitive) and also make sure the email address attached to the site user matches the email the user has attached to their open id account also case sensitive.

If we can pin this down for sure as the problem then I could force lower case on whatever they type, I'm just not yetsure if thats the right solution.

Hope it helps, let me know if you find any information.

Best,

Joe

1/26/2009 5:47:55 PM
arosca
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Re: Exception while attempting to authenticate with OpenID

Joe,

I traced the error back to the following lines in mojoPortal.Web.OpenIdLoginControl.IsValidForUserCreation(OpenIdEventArgs e)

if (e.ProfileFields.Email.Length == 0) return false;

if (!Email.IsValidEmailAddressSyntax(e.ProfileFields.Email)) return false;

if (e.ProfileFields.FullName.Length == 0) return false;

 

It turns out there is something called a Default Persona on MyOpenID, which by default has FullName and Email NULL for new accounts. This is why the lines above are throwing an exception. The code should probably be:

if (String.IsNullOrEmpty(e.ProfileFields.Email)) return false; 
if (String.IsNullOrEmpty(e.ProfileFields.FullName)) return false;

 

1/27/2009 6:31:03 AM
Joe Audette
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Re: Exception while attempting to authenticate with OpenID

Great work troubleshooting this!

I'm making the proposed change now. Just in time for the new release coming tomorrow.

Best,

Joe

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