How to add more than one identity store in aspnet core identity?

Question

I'm currently adding ASP.NET Core Identity with IdentityServer4.

I've added the identity similar to the line below.

services.AddDbContext<PublicApplicationDbContext>(options =>
                options.UseSqlServer(
                    connection))
                .AddIdentity<PublicIdentityUser, PublicIdentityRole>(opts =>
                {
                    opts.Password.RequiredLength = 6;
                })
                .AddDefaultTokenProviders()
                .AddEntityFrameworkStores<PublicApplicationDbContext>();

I wanted to a similar repository so I created a separate set of internal objects like InternalApplicationDbContext, InternalIdentityUser. I thought it would be as easy as configuring the steps above and injecting this...

UserManager<InternalIdentityUser>

However, it doesn't seem to work and I get an error similar to this. Scheme already exists https://github.com/aspnet/AspNetCore.Docs/issues/8223

I've read some documentation related to this but nothing implies it supports more than one identity provider. Is this the case or am I missing something?

To summarize, I want two separate databases to manage users, one for public users and another for internal ones. I want to use the built-in identity API UserManager to encapsulate the implementation as I honestly don't want to build my own.

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/identity-custom-storage-providers?view=aspnetcore-2.2#references

score 1 · Accepted Answer · answered May 14 '19 at 04:34

After looking through the ASP.NET Core source code on github, a second identity could be added using this extension method:

using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using System;
using System.Collections.Generic;
using System.Text;

namespace Whatever
{
    public static class IdentityExtensions
    {
        public static IdentityBuilder AddSecondIdentity<TUser, TRole>(
            this IServiceCollection services)
            where TUser : class
            where TRole : class
        {
            services.TryAddScoped<IUserValidator<TUser>, UserValidator<TUser>>();
            services.TryAddScoped<IPasswordValidator<TUser>, PasswordValidator<TUser>>();
            services.TryAddScoped<IPasswordHasher<TUser>, PasswordHasher<TUser>>();
            services.TryAddScoped<IRoleValidator<TRole>, RoleValidator<TRole>>();
            services.TryAddScoped<ISecurityStampValidator, SecurityStampValidator<TUser>>();
            services.TryAddScoped<IUserClaimsPrincipalFactory<TUser>, UserClaimsPrincipalFactory<TUser, TRole>>();
            services.TryAddScoped<UserManager<TUser>, AspNetUserManager<TUser>>();
            services.TryAddScoped<SignInManager<TUser>, SignInManager<TUser>>();
            services.TryAddScoped<RoleManager<TRole>, AspNetRoleManager<TRole>>();

            return new IdentityBuilder(typeof(TUser), typeof(TRole), services);
        }
    }
}

https://stackoverflow.com/a/47434573/8006943

How to add more than one identity store in aspnet core identity?

1 Answers1