在ASP.NET Core中实现一个Token base的身份认证实例

在Controllers中新建一个Web API Controller Class，命名为TokenAuthController.cs。我们将在这里完成登录授权

在同文件下添加两个类，分别用来模拟用户模型，以及用户存储，代码应该是这样

public class User
{
  public Guid ID { get; set; }
  public string Username { get; set; }
  public string Password { get; set; }
}

public static class UserStorage
{
  public static List<User> Users { get; set; } = new List<User> {
    new User {ID=Guid.NewGuid(),Username="user1",Password = "user1psd" },
    new User {ID=Guid.NewGuid(),Username="user2",Password = "user2psd" },
    new User {ID=Guid.NewGuid(),Username="user3",Password = "user3psd" }
  };
}

接下来在TokenAuthController.cs中添加如下方法

private string GenerateToken(User user, DateTime expires)
{
  var handler = new JwtSecurityTokenHandler();
  
  ClaimsIdentity identity = new ClaimsIdentity(
    new GenericIdentity(user.Username, "TokenAuth"),
    new[] {
      new Claim("ID", user.ID.ToString())
    }
  );

  var securityToken = handler.CreateToken(new SecurityTokenDescriptor
  {
    Issuer = TokenAuthOption.Issuer,
    Audience = TokenAuthOption.Audience,
    SigningCredentials = TokenAuthOption.SigningCredentials,
    Subject = identity,
    Expires = expires
  });
  return handler.WriteToken(securityToken);
}

该方法仅仅只是生成一个Auth Token,接下来我们来添加另外一个方法来调用它

在相同文件中添加如下代码

[HttpPost]
public string GetAuthToken(User user)
{
  var existUser = UserStorage.Users.FirstOrDefault(u => u.Username == user.Username && u.Password == user.Password);

  if (existUser != null)
  {
    var requestAt = DateTime.Now;
    var expiresIn = requestAt + TokenAuthOption.ExpiresSpan;
    var token = GenerateToken(existUser, expiresIn);

    return JsonConvert.SerializeObject(new {
      stateCode = 1,
      requertAt = requestAt,
      expiresIn = TokenAuthOption.ExpiresSpan.TotalSeconds,
      accessToken = token
    });
  }
  else
  {
    return JsonConvert.SerializeObject(new { stateCode = -1, errors = "Username or password is invalid" });
  }
}

该文件完整的代码应该是这样

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Security.Principal;
using Microsoft.IdentityModel.Tokens;
using CSTokenBaseAuth.Auth;

namespace CSTokenBaseAuth.Controllers
{
  [Route("api/[controller]")]
  public class TokenAuthController : Controller
  {
    [HttpPost]
    public string GetAuthToken(User user)
    {
      var existUser = UserStorage.Users.FirstOrDefault(u => u.Username == user.Username && u.Password == user.Password);

      if (existUser != null)
      {
        var requestAt = DateTime.Now;
        var expiresIn = requestAt + TokenAuthOption.ExpiresSpan;
        var token = GenerateToken(existUser, expiresIn);

        return JsonConvert.SerializeObject(new {
          stateCode = 1,
          requertAt = requestAt,
          expiresIn = TokenAuthOption.ExpiresSpan.TotalSeconds,
          accessToken = token
        });
      }
      else
      {
        return JsonConvert.SerializeObject(new { stateCode = -1, errors = "Username or password is invalid" });
      }
    }

    private string GenerateToken(User user, DateTime expires)
    {
      var handler = new JwtSecurityTokenHandler();
      
      ClaimsIdentity identity = new ClaimsIdentity(
        new GenericIdentity(user.Username, "TokenAuth"),
        new[] {
          new Claim("ID", user.ID.ToString())
        }
      );

      var securityToken = handler.CreateToken(new SecurityTokenDescriptor
      {
        Issuer = TokenAuthOption.Issuer,
        Audience = TokenAuthOption.Audience,
        SigningCredentials = TokenAuthOption.SigningCredentials,
        Subject = identity,
        Expires = expires
      });
      return handler.WriteToken(securityToken);
    }
  }

  public class User
  {
    public Guid ID { get; set; }

    public string Username { get; set; }

    public string Password { get; set; }
  }

  public static class UserStorage
  {
    public static List<User> Users { get; set; } = new List<User> {
      new User {ID=Guid.NewGuid(),Username="user1",Password = "user1psd" },
      new User {ID=Guid.NewGuid(),Username="user2",Password = "user2psd" },
      new User {ID=Guid.NewGuid(),Username="user3",Password = "user3psd" }
    };
  }
}

								 
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