在Google OAuth流中访问EF DbContext

Question

我在ASP.NET Core 2.1中有一个有效的Google身份验证流程。

我想通过在用户登录时检查用户的电子邮件地址来添加一些授权。如何在此处访问实体框架DbContext？

public void ConfigureServices(IServiceCollection services)
{
  services
    .AddDbContext<Database>(options => options.UseSqlServer(Configuration["SqlServer"]));

  services
    .AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
    .AddCookie(o =>
    {
      o.LoginPath = "/Auth/SignIn";
      o.LogoutPath = "/Auth/SignOut";
      o.ExpireTimeSpan = TimeSpan.FromDays(90);
    })
    .AddGoogle(o =>
    {
      o.ClientId = Configuration["Auth:Google:ClientId"];
      o.ClientSecret = Configuration["Auth:Google:ClientSecret"];
      o.Events = new OAuthEvents()
      {
        OnTicketReceived = async context =>
        {
          var email = context.Principal.Identity.GetEmail().ToLowerInvariant();
          if (/* User not in database */) // <-- How can I access the EF DbContext here?
          {
            context.Response.Redirect("/Auth/Unauthorised");
            context.HandleResponse();
          }
        }
      };
    });

  services.AddMvc();
  /* ... */
}

Answer 1

您可以从上下文访问您的HttpContext，您可以从那里访问IServiceProvider。

 context.HttpContext.RequestServices.GetService<Database>()