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| 01.24.08
OpenID Implementation In C# & ASP.NET
 By Mads Kristensen
Over the weekend I began looking more deeply into OpenID than I have before.
I've always been intrigued by OpenID, but the information about it in terms of code samples in .NET have not been impressive. There are a few projects here and there but they all use a library for handling communication with the OpenID providers.
What I wanted was some code that demonstrated how it works. Not a pre-packaged library to code against. No, I wanted to see how the mechanisms worked so I could try it out in real life with my own code. After searching the web for hours, I finally gave up and started to look at the specs so I could write it myself from scratch. The specs are really hard to understand in terms of actual implementation. They say nothing about protocols and formats, which make it pretty hard to grasp.
After a few ours of hitting the wall with the specs in my hand, I finally found this CodePlex project that was abandoned in July 2007. For some reason, this particular project didn't show up in Google, but I found it by searching the CodePlex site. It made it much easier to understand the mechanisms involved, but it was far from finished and way too complex for what it was trying to solve.
What is OpenID
If you don't know what OpenID is, then take a look at this short video that explains it very well.
The goal
My goal was simple. I wanted to be able to add support for OpenID authentication on existing websites. It means that I wanted to use a standard textbox for entering the OpenID into and a button that would start the whole authentication mechanism. In order to do that, I needed a class that would take care of the communication with the OpenID servers and handle the authentication for me.
So, I ended up with a single small class that can be dumped into any ASP.NET website. It handles the redirection to the OpenID provider and leaves the authentication handling up to the website, but provides all the relevant information for doing so. The class is called OpenID and is very short and simple.
Code example
If you don't care about the code, but still wants to see how this baby works, check out my OpenID video. You can also download the small code sample at the bottom of the post.
Continue reading this article.
About the Author:
Mads Kristensen currently works as a Senior Developer at Traceworks located in Copenhagen, Denmark. Mads graduated from Copenhagen Technical Academy with a multimedia degree in 2003, but has been a professional developer since 2000. His main focus is on ASP.NET but is responsible for Winforms, Windows- and web services in his daily work as well. A true .NET developer with great passion for the simple solution.
http://www.madskristensen.dk/ | |
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