Category Archives: ASP.NET

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In many of my latest applications, it’s necessary to have data drive what a form-element actually lets the user enter. For example, I may have a drop-down to select a property, and then, based on that property, a common text-box is used for its entry.

Sometimes its nice to have the data-type of the property drive a user-friendly experience.

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Over the weekend, I attended Codestock. One of the sessions that I attended dealt with a subject I had wrestled with myself: eliminating string literals.

While the session focused on HtmlHelper extensions for MVC, I have used the same techniques for building general LINQ expressions, queries, and other useful aspects.

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After my brief primer (Part 1) of the things I’m looking to accomplish with Angular in what I consider a large-scale application, I’ve had a week or so to toss around ideas and get a solid foundation.

To recap, I want this application to avoid becoming an unruly, behemoth that is unmanageable. I want core, reusable components to be separated from core functionality. That is to say, I want loose coupling. The application should have hooks, navigation, and what not that is self-aware while allowing multiple developers to create their own discrete set of functional areas. In that vein, or to that end, I want “areas” to be independent for the most part and, as such, developers should be able to work on the individual functional areas without stepping all over each other’s code, or worrying much about breaking other parts of the application.

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This week, my team and I have embarked on a new large scale application.  It’s predominately your typical web multi-tier web application with business logic, security, CRUD, and what not.

However, it’s also going to be an Angular Single Page App (SPA). Thinking about the structure of this application, in terms functional blocks and project/solution layout is pivotal in the design and engineering process.

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After creating a redistributal package for a custom OWIN AuthenticationHandler that handles logins to an internally hosted Oauth2/SSO provider, I found something a little annoying.

When OWIN detects a 401 response and the AuthenticationMode is “Active,” it doesn’t capture the URL hash from the request.

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Being able to decrypt the OWIN AuthenticationTicket can be very useful. In the cases where the cookie/tickets are shared across applications, this is especially true.

Interestingly, if you’re using OWIN for both cookie-based authentication and access tokens, the Ticket is stored in both mediums.

With that in mind, the easiest method to decrypt a ticket to access claims, etc is to simply stand up a protected Resource server with a single Api endpoint to display the contents of the ticket. Going this route, the decryption is automatically handled by OWIN with very little code. The endpoint can be accessed by a user’s browser (decrypting the cookie) or by a server passing in a Bearer token.

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With my previous endeavors using OWIN Middleware for an SSO Authentication system, I used DotNetOpenAuth as the client to make the OAuth Authorization Code grant flow. However, after a bit of research, I’ve learned that hooking into the OWIN Middleware can completely eliminate the need to use DotNetOpenAuth.

Additionally, eliminating DotNetOpenAuth and its dependencies makes creating a Nuget reusable package for the applications that I intended to use with the SSO/OAuth2 mechanism much simpler.

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Adding custom claims in .NET Identity, through OWIN, or otherwise is pretty straight forward.

But, what if we want to step outside of, or augment, the OAuth flow?

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Earlier today, after a system outage, I was sent a W3C IIS Log to take a look at.

After staring at this log for a few minutes in Notepad2, my eyes started to glaze over. Basically, staring at system or IIS logs with a text editor is useless if there are tons of events or requests.

I knew there are plenty of parsing tools out there for log analysis, and I had used some before. Unfortunately, I had none of these tools installed on my laptop. Googling quick lead me to a Microsoft tool called ‘LogParser’ that I had never heard of before.

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I’m still playing with Azure and getting a full fledged application working and hosted using the Azure services. As I showed yesterday, setting up a Web App is pretty easy.

The next step for me involves moving an Entity Framework Database using Migrations to Azure.

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