asp.net-core - 使用自定义函数 .NET Core 2 覆盖 OnTokenValidated JwtBearerEvents

Question

在我的 API 项目中，我正在使用 JwtBearer 处理身份验证(用户使用 Azure 登录)。调用 API 时，将使用定义的 Azure 实例验证 token ，这一切正常。
当 token 被成功验证时，登录用户将被插入到我们自己的数据库中，并具有适当的角色。现在处理的方式如下:

// Add authentication (Azure AD)
services
    .AddAuthentication(sharedOptions =>
    {
        sharedOptions.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
        sharedOptions.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme; 
        sharedOptions.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme; 
    })
    .AddJwtBearer(options =>
    {
        options.Audience = this.Configuration["AzureAd:ClientId"];
        options.Authority = $"{this.Configuration["AzureAd:Instance"]}{this.Configuration["AzureAd:TenantId"]}";

        options.Events = new JwtBearerEvents()
        {
            OnTokenValidated = context =>
            {
                // Check if the user has an OID claim
                if (!context.Principal.HasClaim(c => c.Type == "http://schemas.microsoft.com/identity/claims/objectidentifier"))
                {
                    context.Fail($"The claim 'oid' is not present in the token.");
                }

                ClaimsPrincipal userPrincipal = context.Principal;
                
                // Check is user exists, if not then insert the user in our own database
                CheckUser cu = new CheckUser(
                    context.HttpContext.RequestServices.GetRequiredService<DBContext>(),
                    context.HttpContext.RequestServices.GetRequiredService<UserManager<ApplicationUser>>(),
                    userPrincipal);

                cu.CreateUser();

                return Task.CompletedTask;
            },
        };
    });

这工作正常，但它不是最漂亮/最正确的方法。我会说我应该使用依赖注入(inject)/覆盖 OnTokenValidated事件并整合' CheckUser ' 那里的逻辑所以 startup类保持整洁。
遗憾的是，我缺乏对 DI 的了解，我不完全确定正确处理此问题的最佳方法是什么。因此，我环顾四周，发现了一篇准确描述我的问题的帖子:
Problems handling OnTokenValidated with a delegate assigned in startup.cs
阅读这篇文章后，我尝试用自己的逻辑对其进行一些修改，最终得到以下结果:
在启动中:

services.AddScoped<UserValidation>();

services
    .AddAuthentication(sharedOptions =>
    {
        sharedOptions.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
        sharedOptions.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
        sharedOptions.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme; 
    })
    .AddJwtBearer(options =>
    {
        options.Audience = this.Configuration["AzureAd:ClientId"];
        options.Authority = $"{this.Configuration["AzureAd:Instance"]}{this.Configuration["AzureAd:TenantId"]}";

        options.EventsType = typeof(UserValidation);
    });

自定义 JwtBearerEvents 类:

public class UserValidation : JwtBearerEvents
{
    private string UserID { get; set; }

    private string UserEmail { get; set; }

    private string UserName { get; set; }

    public override async Task TokenValidated(TokenValidatedContext context)
    {
        try
        {
            TRSContext context2 = context.HttpContext.RequestServices.GetRequiredService<TRSContext>();
            UserManager<ApplicationUser> userManager = context.HttpContext.RequestServices.GetRequiredService<UserManager<ApplicationUser>>();

            ClaimsPrincipal userPrincipal = context.Principal;

            this.UserID = userPrincipal.Claims.First(c => c.Type == "http://schemas.microsoft.com/identity/claims/objectidentifier").Value;

            if (userPrincipal.HasClaim(c => c.Type == "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress"))
            {
                this.UserEmail = userPrincipal.Claims.First(c => c.Type == "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress").Value;
            }

            if (userPrincipal.HasClaim(c => c.Type == "name"))
            {
                this.UserName = userPrincipal.Claims.First(c => c.Type == "name").Value;
            }

            var checkUser = userManager.FindByIdAsync(this.UserID).Result;
            if (checkUser == null)
            {
                checkUser = new ApplicationUser
                {
                    Id = this.UserID,
                    Email = this.UserEmail,
                    UserName = this.UserEmail,
                };

                var result = userManager.CreateAsync(checkUser).Result;

                // Assign Roles
                if (result.Succeeded)
                {
                    return;  
                }
                else
                {
                    throw new Exception(result.Errors.First().Description);
                }
            }
        }
        catch (Exception)
        {
            throw;
        }
    }
}

然而，由于某种原因，这不起作用。没有错误和 UserValidation从未被命中(尝试设置调试点但从未命中)并且它不会插入新用户(在使用旧代码时会这样做)。
任何人都知道我在这里做错了什么，或者可能有一些更好的想法来处理这个问题？

Answer 1

如您所展示的，我建议您在启动时进行基本的 token 验证(例如权威和受众)。我建议您使用基于策略的验证来进行特定的 claim 验证。见 Policy-based authorization in ASP.NET Core
结果将是更简单、更易于维护的代码。