Get the UserManager instance outside of ASP.NET web application?

Question

I have an ASP.NET MVC 5 web app with ASP.NET Identity (Individual Accounts). But I need to be able to register new users from a console app.

So I'm moving some of the ASP.NET Identity classes from the web app into a class library to be shared between the web app and the CLI.

I have successfully moved the following:

public class PortalDbContext : IdentityDbContext<PortalUser>
{
    public PortalDbContext(string connectionString)
        : base(connectionString, throwIfV1Schema: false)
    {
    }

    public static PortalDbContext Create(string connectionString)
    {
        return new PortalDbContext(connectionString);
    }
}

public class PortalUser : IdentityUser
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<PortalUser> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);

        // Add custom user claims here
        return userIdentity;
    }
}

public class PortalUserManager : UserManager<PortalUser>
{
    public PortalUserManager(IUserStore<PortalUser> store) : base(store)
    {
    }

    public async Task<IdentityResult> RegisterUser(string email, string password)
    {
        PortalUser user = new PortalUser { UserName = email, Email = email };

        return await this.CreateAsync(user, password);
    }
}

But I have no idea where to get the IUserStore<PortalUser> the PortalUserManager needs from.

In the web app, this manager is retrieved from HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>() which I clearly can't use in a class library.

Answer 1

I've ended up adding a static method Create(string connectionString) to PortalUserManager that will create the UserStore and DbContext and return a new instance of the manager.

public class PortalDbContext : IdentityDbContext<PortalUser>
{
    public PortalDbContext(string connectionString)
        : base(connectionString, throwIfV1Schema: false)
    {
    }

    public static PortalDbContext Create(string connectionString)
    {
        return new PortalDbContext(connectionString);
    }
}

public class PortalUser : IdentityUser
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<PortalUser> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);

        // Add custom user claims here
        return userIdentity;
    }
}

public class PortalUserManager : UserManager<PortalUser>
{
    public PortalUserManager(IUserStore<PortalUser> store) : base(store)
    {
    }

    public static PortalUserManager Create(string connectionString)
    {
        UserStore<PortalUser> userStore = new UserStore<PortalUser>(PortalDbContext.Create(connectionString));

        PortalUserManager manager = new PortalUserManager(userStore);

        // Configure validation logic for usernames
        manager.UserValidator = new UserValidator<PortalUser>(manager)
        {
            AllowOnlyAlphanumericUserNames = true,
            RequireUniqueEmail = true                
        };

        // Configure validation logic for passwords
        manager.PasswordValidator = new PasswordValidator
        {
            RequiredLength = 6,
            RequireNonLetterOrDigit = true,
            RequireDigit = true,
            RequireLowercase = true,
            RequireUppercase = true,
        };

        return manager;
    }

    public async Task<IdentityResult> RegisterUser(string email, string password)
    {
        PortalUser user = new PortalUser { UserName = email, Email = email };

        return await this.CreateAsync(user, password);
    }
}