ASP.NET Core身份-获取当前用户

要获得MVC5中当前登录的用户，我们要做的就是：

using Microsoft.AspNet.Identity;
[Authorize]
public IHttpActionResult DoSomething() {
    string currentUserId = User.Identity.GetUserId();
}

现在，我认为使用ASP.NET Core应该可以，但是会引发错误。

using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Http;

private readonly UserManager<ApplicationUser> _userManager;
[HttpPost]
[Authorize]
public async Task<IActionResult> StartSession() {
    var curUser = await _userManager.GetUserAsync(HttpContext.User);
}

有任何想法吗？

编辑： Gerardo的响应已步入正轨，但要获得用户的实际“ Id”，这似乎可行：

ClaimsPrincipal currentUser = this.User;
var currentUserID = currentUser.FindFirst(ClaimTypes.NameIdentifier).Value;

假设您的代码在MVC控制器中：

public class MyController : Microsoft.AspNetCore.Mvc.Controller

从Controller基类中，您可以IClaimsPrincipal从User属性中获取

System.Security.Claims.ClaimsPrincipal currentUser = this.User;

您可以直接检查声明（无需往返数据库）：

bool IsAdmin = currentUser.IsInRole("Admin");
var id = _userManager.GetUserId(User); // Get user id:

可以从数据库的User实体中获取其他字段：

1. 使用依赖注入获取用户管理器

   private UserManager<ApplicationUser> _userManager;
   
   //class constructor
   public MyController(UserManager<ApplicationUser> userManager)
   {
       _userManager = userManager;
   }
   

2. 并使用它：

   var user = await _userManager.GetUserAsync(User);
   var email = user.Email;
   

如果您使用的是轴承令牌认证，则以上示例不会返回“应用程序用户”。

而是使用以下命令：

ClaimsPrincipal currentUser = this.User;
var currentUserName = currentUser.FindFirst(ClaimTypes.NameIdentifier).Value;
ApplicationUser user = await _userManager.FindByNameAsync(currentUserName);

这适用于apsnetcore 2.0。尚未尝试在较早版本中使用。

就上下文而言，我使用ASP.NET Core 2 Web应用程序模板创建了一个项目。然后，选择Web应用程序（MVC），然后单击“更改身份验证”按钮并选择“个人用户”帐户。

此模板为您构建了许多基础结构。找到ManageController在Controllers文件夹。

此类的ManageController构造函数需要填充以下UserManager变量：

private readonly UserManager<ApplicationUser> _userManager;

然后，查看此类中的[HttpPost] Index方法。他们以这种方式获取当前用户：

var user = await _userManager.GetUserAsync(User);

值得一提的是，您想在这里将所有自定义字段更新为已添加到AspNetUsers表中的用户配置文件。将字段添加到视图，然后将这些值提交到IndexViewModel，然后将其提交到此Post方法。我在默认逻辑之后添加了以下代码来设置电子邮件地址和电话号码：

user.FirstName = model.FirstName;
user.LastName = model.LastName;
user.Address1 = model.Address1;
user.Address2 = model.Address2;
user.City = model.City;
user.State = model.State;
user.Zip = model.Zip;
user.Company = model.Company;
user.Country = model.Country;
user.SetDisplayName();
user.SetProfileID();

_dbContext.Attach(user).State = EntityState.Modified;
_dbContext.SaveChanges();

在.NET Core 2.0中，用户已经作为基础继承控制器的一部分存在。只需像平常一样使用User或传递到任何存储库代码即可。

[Authorize(AuthenticationSchemes = JwtBearerDefaults.AuthenticationScheme, Policy = "TENANT")]
[HttpGet("issue-type-selection"), Produces("application/json")]
public async Task<IActionResult> IssueTypeSelection()
{
    try
    {
        return new ObjectResult(await _item.IssueTypeSelection(User));
    }
    catch (ExceptionNotFound)
    {
        Response.StatusCode = (int)HttpStatusCode.BadRequest;
        return Json(new
        {
            error = "invalid_grant",
            error_description = "Item Not Found"
        });
    }
}

这是它从那里继承的地方

#region Assembly Microsoft.AspNetCore.Mvc.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60
// C:\Users\BhailDa\.nuget\packages\microsoft.aspnetcore.mvc.core\2.0.0\lib\netstandard2.0\Microsoft.AspNetCore.Mvc.Core.dll
#endregion

using System;
using System.IO;
using System.Linq.Expressions;
using System.Runtime.CompilerServices;
using System.Security.Claims;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
using Microsoft.AspNetCore.Routing;
using Microsoft.Net.Http.Headers;

namespace Microsoft.AspNetCore.Mvc
{
    //
    // Summary:
    //     A base class for an MVC controller without view support.
    [Controller]
    public abstract class ControllerBase
    {
        protected ControllerBase();

        //
        // Summary:
        //     Gets the System.Security.Claims.ClaimsPrincipal for user associated with the
        //     executing action.
        public ClaimsPrincipal User { get; }

就算有人有兴趣，这对我也有帮助。我有一个使用int作为主键的自定义标识，因此我覆盖了GetUserAsync方法

覆盖GetUserAsync

public override Task<User> GetUserAsync(ClaimsPrincipal principal)
{
    var userId = GetUserId(principal);
    return FindByNameAsync(userId);
}

获取身份用户

var user = await _userManager.GetUserAsync(User);

如果您使用常规的Guid主键，则不需要覆盖GetUserAsync。所有这些都假设您的令牌已正确配置。

public async Task<string> GenerateTokenAsync(string email)
{
    var user = await _userManager.FindByEmailAsync(email);
    var tokenHandler = new JwtSecurityTokenHandler();
    var key = Encoding.ASCII.GetBytes(_tokenProviderOptions.SecretKey);

    var userRoles = await _userManager.GetRolesAsync(user);
    var roles = userRoles.Select(o => new Claim(ClaimTypes.Role, o));

    var claims = new[]
    {
        new Claim(JwtRegisteredClaimNames.Sub, user.UserName),
        new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
        new Claim(JwtRegisteredClaimNames.Iat, DateTime.UtcNow.ToString(CultureInfo.CurrentCulture)),
        new Claim(JwtRegisteredClaimNames.GivenName, user.FirstName),
        new Claim(JwtRegisteredClaimNames.FamilyName, user.LastName),
        new Claim(JwtRegisteredClaimNames.Email, user.Email),
    }
    .Union(roles);

    var tokenDescriptor = new SecurityTokenDescriptor
    {
        Subject = new ClaimsIdentity(claims),
        Expires = DateTime.UtcNow.AddHours(_tokenProviderOptions.Expires),
        SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature)
    };

    var token = tokenHandler.CreateToken(tokenDescriptor);

    return Task.FromResult(new JwtSecurityTokenHandler().WriteToken(token)).Result;
}

private readonly UserManager<AppUser> _userManager;

 public AccountsController(UserManager<AppUser> userManager)
 {
            _userManager = userManager;
 }

[Authorize(Policy = "ApiUser")]
[HttpGet("api/accounts/GetProfile", Name = "GetProfile")]
public async Task<IActionResult> GetProfile()
{
   var userId = ((ClaimsIdentity)User.Identity).FindFirst("Id").Value;
   var user = await _userManager.FindByIdAsync(userId);

   ProfileUpdateModel model = new ProfileUpdateModel();
   model.Email = user.Email;
   model.FirstName = user.FirstName;
   model.LastName = user.LastName;
   model.PhoneNumber = user.PhoneNumber;

   return new OkObjectResult(model);
}

我在Controller类中放入了类似的内容，它的工作原理是：

IdentityUser user = await userManager.FindByNameAsync(HttpContext.User.Identity.Name);

其中，userManager是Microsoft.AspNetCore.Identity.UserManager类的实例（带有所有与此相关的怪异设置）。