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OpenId Connect in ASP.NET MVC with legacy backend

Background: To integrate OpenId Connect (henceforth OIDC) in a new ASP.NET MVC application, we can easily use ASP.NET Identity which relies on OWIN. What to do, when you have a legacy ASP.NET MVC application with custom Forms Authentication and identity management taken care by a legacy backend service(SOAP)? I’ll try to describe the process of achieving this kind of integration. Basics Before we get to the nuts and bolts of things promised in this post, lets quickly define some key concepts:

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What is a Proxy server?

Proxy: The authority to represent someone else, especially in voting. A person authorized to act on behalf of another. A proxy server in a computer network, is setup as a gateway to the internet (or any other servers) for network clients. In such a setup, the proxy server acts as an intermediary between local network clients and internet. A client connects to the proxy server with a request to resource on internet and proxy server evaluates the request and replies from its cache (if caching is the purpose for implementing a proxy) or forwards to the actual server.

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Factory method pattern implementation in .net framework

Factory method pattern also called as Virtual Constructor (less known), defines an interface for creating objects, but defer the instantiation to sub-classes. Read more about the pattern: Wikipedia, dofactory, Sourcemaking, oodesign, etc. I can safely state, that: A well designed library cannot exist without implementing factory method pattern. We can see .net framework implementing this pattern extensively, few examples: System.Activator.CreateInstance(Type type) System.Net.WebRequest.Create(string requestUriString) based on the url scheme, if url starts with http://, a System.

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Abstract factory design pattern implementation in .NET framework

What is abstract factory pattern? See Wikipedia, dofactory, Sourcemaking, oodesign, etc.. .NET framework uses/implements many design patterns, abstract factory is one such. System.Data.Common.DbProviderFactory is an implementation of abstract factory pattern. Every method in this class is an implementation of Factory method pattern. DbProviderFactory is inherited by the following Concrete factories SqlClientFactory, OdbcFactory, OracleClientFactory, etc. They implement the operations declared in DbProviderFactory to communicate with specific database implementations. Every concrete factory can build a Concrete product, in this case, SqlClientFactory.

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C# out vars and discards

C# 7 introduces an improved syntax for joining declaration and usage of an out variable. Consider the following example: int integerVal; int.TryParse("123", out integerVal); The same can now be re-written in c# 7 as follows: int.TryParse("123", out int integerVal); Notice the int right after the out keyword, which enables you to declare the variable in the method call itself, instead of a separate declaration before the method call. Additionally, you can also use an implicitly typed local variable, instead of defining a typed variable.

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