如何在 ASP.NET Core 3.0 Preview 5 中将声明映射选项传递给 IdentityServerJwt？

灵感来自关于自定义声明的文章 https://korzh.com/blogs/net-tricks/aspnet-identity-store-user-data-in-claims，我已将租户 ID 自定义声明添加到我的身份服务器登录过程中，如下所示：

using System;
using System.Security.Claims;
using System.Threading.Tasks;
using MyNamespace.Models;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.Options;
using MyNamespace.Data;
using MyNamespace.Constants;

namespace MyNamespace.Factories
{

    public class TenantClaimsPrincipalFactory : UserClaimsPrincipalFactory<ApplicationUser>
    {
        public TenantClaimsPrincipalFactory(
            UserManager<ApplicationUser> userManager,
            IOptions<IdentityOptions> optionsAccessor)
            : base(userManager, optionsAccessor) {
        }

        // TODO: Remove hard binding to application db context
        protected override async Task<ClaimsIdentity> GenerateClaimsAsync(ApplicationUser user) {
            var identity = await base.GenerateClaimsAsync(user);
            var tenantId = ApplicationDbContext.DefaultTenantId;
            if (user.TenantId != Guid.Empty) {
                tenantId = user.TenantId;
            }
            identity.AddClaim(new Claim(CustomClaimTypes.TenantId, tenantId.ToString()));
            return identity;
        }
    } 

}

声明生成方法在登录时执行，并将声明添加到身份中，因此这部分看起来没问题。后来我尝试在我的租户提供商服务中读出索赔，如下所示

using System;
using MyNamespace.Data;
using Microsoft.AspNetCore.Http;
using System.Security.Claims;
using System.Linq;
using MyNamespace.Constants;

namespace MyNamespace.Services
{

    public interface ITenantProvider
    {
        Guid GetTenantId();
    }

    public class TenantProvider : ITenantProvider
    {
        private IHttpContextAccessor _httpContextAccessor;

        public TenantProvider(IHttpContextAccessor httpContextAccessor
        {
            _httpContextAccessor = httpContextAccessor;
        }

        // TODO: Remove hard binding to application db context
        public Guid GetTenantId()
        {
            var userId = _httpContextAccessor.HttpContext.User.FindFirst(ClaimTypes.NameIdentifier).Value;
            var user = _httpContextAccessor.HttpContext.User;
            var tenantId = _httpContextAccessor.HttpContext.User.FindFirst(CustomClaimTypes.TenantId).Value;    

            Guid tenantGuid = ApplicationDbContext.DefaultTenantId;
            Guid.TryParse(tenantId, out tenantGuid);

            return tenantGuid;
        }
    }

}

然而，据我了解，该声明由CustomClaimTypes.TenantId is 身份服务器不自动映射 https://leastprivilege.com/2017/11/15/missing-claims-in-the-asp-net-core-2-openid-connect-handler/。我的问题是：我怎样才能映射

options.ClaimActions.MapUniqueJsonKey(CustomClaimTypes.TenantId, CustomClaimTypes.TenantId);

from Startup.cs我在其中添加身份服务器我的依赖项：

services.AddAuthentication()
            .AddIdentityServerJwt();

所以，最终我得到了一个与我最初寻求的不同的解决方案。我没有映射工厂创建的声明，而是遇到了StackOverflow 上的另一篇文章 https://stackoverflow.com/questions/44761058/how-to-add-custom-claims-to-access-token-in-identityserver4。基本上，我所做的如下。我实施了以下ProfileService

namespace MyNamespace.Services
{

    public class ProfileService : IProfileService
    {
        protected UserManager<ApplicationUser> _userManager;

        public ProfileService(UserManager<ApplicationUser> userManager)
        {
            _userManager = userManager;
        }

        public async Task GetProfileDataAsync(ProfileDataRequestContext context)
        {
            var user = await _userManager.GetUserAsync(context.Subject);

            var claims = new List<Claim>
            {
                new Claim(CustomClaimTypes.TenantId, user.TenantId.ToString()),
            };

            context.IssuedClaims.AddRange(claims);
        }

        public async Task IsActiveAsync(IsActiveContext context)
        {
            var user = await _userManager.GetUserAsync(context.Subject);

            context.IsActive = (user != null) && user.IsActive;
        }
    }

}

然后，我将服务添加到 DI 容器中：Configure:

services.AddIdentityServer()
                .AddApiAuthorization<ApplicationUser, ApplicationDbContext>()
                .AddProfileService<ProfileService>();

services.AddAuthentication()
                .AddIdentityServerJwt();

所以，我还是很开心地让AddIdentityServerJwt设置 IdentityServer4，同时获取我的声明。