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ASP.NET Identity and CodeFluent Entities


Update (2014/06/23) – please check out these related posts :

The ASP.NET Identity system is designed to replace the previous ASP.NET Membership and Simple Membership systems. It includes profile support, OAuth integration, works with OWIN and is included with the ASP.NET templates shipped with Visual Studio 2013.

ASP.NET Role and Membership providers are out of the box features provided by CodeFluent Entities. Today we’ll see how to create an ASP.NET Identity implementation with CodeFluent Entities.

Let’s do this ! 🙂

What do we have to do?

ASP.NET Identity provides a bunch of interfaces to define Users, Profiles, Logins, Roles, and how to store them.

A user is defined by the Microsoft.AspNet.Identity.IUser interface and a role is defined by the Microsoft.AspNet.Identity.IRole interface. Those interface are very generics:

public interface IUser
{
    string Id { get; }
    string UserName { get; set; }
}

public interface IRole
{
    string Id { get; }
    string Name { get; set; }
}

ASP.NET Identity also introduce the concept of user store to persist user information. There are different levels of functionalities depending of your needs:

Finally, the Microsoft.AspNet.Identity.UserManager is a higher level API that will coordinate different components such as the UserStore, the Password hasher and the user and password validation in order to manage users in your application.

Now you should have understood that to do our custom ASP.NET Identity we’ll implement the IUser, IRole and IUser*Store interfaces (yes all of them).

Let’s create the model

 

CodeFluentEntitiesAspNetIdentity

User must implement the IUser interface. This can be done by adding an implementation Rule. The same apply for Role with the IRole interface.

To ensure the uniqueness of the username and role name we declared them at CollectionKey. This will also add automatically the methods User.LoadByUserName and Role.LoadByName.

To implement the UserStore we’ll need two more methods. The first one is to find a customer by a provider key. To do so we add a CFQL method on the user entity:

LOADONE(string providerKey) WHERE ExternalLogins.ProviderKey = @providerKey

We also need to delete a claim by User, Type and Value. This can also be done by CFQL

DELETE(User, Type, Value) WHERE User = @User AND Type = @Type AND Value = @Value

Those methods will be translated into stored procedures during the build process. Note that with CFQL you don’t have to bother with JOIN nor types ! 🙂

Below is a part of UserStore and RoleStore implementation :

public class UserStore :
    IUserStore<User>,
    IUserPasswordStore<User>,
    IUserSecurityStampStore<User>,
    IUserRoleStore<User>,
    IUserLoginStore<User>,
    IUserClaimStore<User>
{

    public Task CreateAsync(User user)
    {
        if (user == null) throw new ArgumentNullException("user");
        return Task.Run(() => user.Save());
    }

    public Task DeleteAsync(User user)
    {
        if (user == null) throw new ArgumentNullException("user");
        return Task.Run(() => user.Delete());
    }

    public Task<User> FindByIdAsync(string userId)
    {
        return Task.Run(() => User.LoadByEntityKey(userId));
    }
// ...
}

public class RoleStore : IRoleStore<Role>
{
    public Task CreateAsync(Role role)
    {
        return Task.Run(() => role.Save());
    }

    public Task<Role> FindByNameAsync(string roleName)
    {
        return Task.Run(() => Role.LoadByName(roleName));
    }
// ...
}

Now we can use the UserStore through the UserManager and the RoleStore through the RoleManager:

new UserManager<User>(new UserStore())
new RoleManager<Role>(new RoleStore())

In the article we show that the code generated by CodeFluent Entities can easily be used with really new Framework like ASP.NET Identity. This is possible as CodeFluent Entities generates rock-solid foundation on which you can build your application !

The full implementation is available for download.

Happy user storing,

The R&D team.

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