server/src/Core/Identity/CustomIdentityServiceCollectionExtensions.cs

using Bit.Core.Auth.Identity;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.DependencyInjection.Extensions;

namespace Microsoft.Extensions.DependencyInjection;

// ref: https://github.com/aspnet/Identity/blob/dev/src/Microsoft.AspNetCore.Identity/IdentityServiceCollectionExtensions.cs
public static class CustomIdentityServiceCollectionExtensions
{
    public static IdentityBuilder AddIdentityWithoutCookieAuth<TUser, TRole>(
        this IServiceCollection services)
        where TUser : class
        where TRole : class
    {
        return services.AddIdentityWithoutCookieAuth<TUser, TRole>(setupAction: null);
    }

    public static IdentityBuilder AddIdentityWithoutCookieAuth<TUser, TRole>(
        this IServiceCollection services,
        Action<IdentityOptions> setupAction)
        where TUser : class
        where TRole : class
    {
        // Hosting doesn't add IHttpContextAccessor by default
        services.AddHttpContextAccessor();
        // Identity services
        services.TryAddScoped<IUserValidator<TUser>, UserValidator<TUser>>();
        services.TryAddScoped<IPasswordValidator<TUser>, PasswordValidator<TUser>>();
        services.TryAddScoped<IPasswordHasher<TUser>, PasswordHasher<TUser>>();
        services.TryAddScoped<ILookupNormalizer, LowerInvariantLookupNormalizer>();
        services.TryAddScoped<IRoleValidator<TRole>, RoleValidator<TRole>>();
        // No interface for the error describer so we can add errors without rev'ing the interface
        services.TryAddScoped<IdentityErrorDescriber>();
        services.TryAddScoped<ISecurityStampValidator, SecurityStampValidator<TUser>>();
        services.TryAddScoped<ITwoFactorSecurityStampValidator, TwoFactorSecurityStampValidator<TUser>>();
        services.TryAddScoped<IUserClaimsPrincipalFactory<TUser>, UserClaimsPrincipalFactory<TUser, TRole>>();
        services.TryAddScoped<IUserConfirmation<TUser>, DefaultUserConfirmation<TUser>>();
        services.TryAddScoped<UserManager<TUser>>();
        services.TryAddScoped<SignInManager<TUser>>();
        services.TryAddScoped<RoleManager<TRole>>();

        if (setupAction != null)
        {
            services.Configure(setupAction);
        }

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