OAuth with custom oauth provider in MVC 4

Question

I'm writing a simple web application in MVC 4, and I want to OAuth with Trello so that I can ask a user to log-in with their trello details and then see some of their cards.

Can anyone provide information about creating a custom oauth provider to support non-out of the box oauth providers? From what I can see, I think I need to create a custom Oauth provider (subclass IAuthenticationClient and use that) - is that right?

Answer 1

Okay, I spent the 11 hours since my comment writing a custom oAuth class for SO. Tomorrow I get to do one of sales force. I'm not excited.

Here's what I did:

1. Create a DataContract class for your expected Json/Xml. I went ahead and implemented everything that SO returns, but if you're only doing authorization you can probably cut it down to an ID and DisplayName.

2. Create a class that extends OAuth2Client from DotNetOpenAuth.AspNet.Clients. Use the DotNetOpenAuth GitHub page for examples. This is the longest, and most painful step, especially if your json serialization is rusty.

3. Open up /App_Start/AuthConfig.cs and enter OAuthWebSecurity.RegisterClient(new YourClass(Your, Initalization, Params), "The Name You Want to Show Up On Your oAuth Login Button", ExtraDataIfYouNeedIt; somewhere in the RegisterAuth() section. I haven't established what the ExtraData param is for, but I didn't need it in my case. Hopefully you won't need it in yours.

Edit: Updated github link.