I was looking at idsrv4 and how to integrate it with a custom user store. In this case it was SQL Server.
idsrv4 uses .NET Core 2.2 but a lot of the samples I found were for earlier versions of .Net Core.
Some of the samples used IUserService but I couldn't find that.
So Mr Google to the rescue.
e.g.
https://stackoverflow.com/questions/35304038/identityserver4-register-userservice-and-get-users-from-database-in-asp-net-core
"In IdentityServer4. IUserService is not available anymore, now you have to use IResourceOwnerPasswordValidator to do the authentication and to use IProfileService to get the claims."
The problem I have with this is that Resource Owner Password is not just a random method name. It's the name of an OAuth flow! Most people don't realise this.
My client used implicit flow. Using IResourceOwnerPasswordValidator makes no sense.
So you can just use a controller to authenticate the user like the AccountController.
Enjoy!
