.net core 学习小结之 JWT 认证授权

• 新增配置文件

  {
    "Logging": {
      "IncludeScopes": false,
      "Debug": {
        "LogLevel": {
          "Default": "Warning"
        }
      },
      "Console": {
        "LogLevel": {
          "Default": "Warning"
        }
      }
    },
    "JwtSettings": {
      "Issuer": "http://locahost:5000",
      "Audience": "http://locahost:5000",
      "SecretKey": "hello world this is my key for cyao"
    }
  }

  namespace JwtAuth
  {
      public class JwtSettings
      {
          ///使用者
          public string Issuer { get; set; }
          ///颁发者
          public string Audience { get; set; }
          ///秘钥必须大于16个字符
          public string SecretKey { get; set; }
      }
  }

• 将配置文件读取映射到实体类，并且将jwt授权加入到管道中

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Threading.Tasks;
  using Microsoft.AspNetCore.Builder;
  using Microsoft.AspNetCore.Hosting;
  using Microsoft.Extensions.Configuration;
  using Microsoft.Extensions.DependencyInjection;
  using Microsoft.Extensions.Logging;
  using Microsoft.Extensions.Options;
  
  namespace JwtAuth
  {
      using Microsoft.AspNetCore.Authentication.JwtBearer;
      using Microsoft.AspNetCore.Authorization;
      using Microsoft.IdentityModel.Tokens;
      public class Startup
      {
          public Startup(IConfiguration configuration)
          {
              Configuration = configuration;
          }
          public IConfiguration Configuration { get; }
          // This method gets called by the runtime. Use this method to add services to the container.
          public void ConfigureServices(IServiceCollection services)
          {
              //将配置文件读取到settings
              services.Configure<JwtSettings>(Configuration.GetSection("JwtSettings"));
              JwtSettings settings = new JwtSettings();
              Configuration.Bind("JwtSettings", settings);
              //添加授权信息
              services.AddAuthentication(options =>
              {
                  options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                  options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
  
              })
              .AddJwtBearer(c => c.TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters//添加jwt 授权信息
              {
                  ValidIssuer = settings.Issuer,
                  ValidAudience = settings.Audience,
                  IssuerSigningKey = new SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes(settings.SecretKey))
              });
              services.AddMvc();
          }
          // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
          public void Configure(IApplicationBuilder app, IHostingEnvironment env)
          {
              if (env.IsDevelopment())
              {
                  app.UseDeveloperExceptionPage();
              }
              //向builder中添加授权的管道
              app.UseAuthentication();
              app.UseMvc();
          }
      }
  }

• 判断当前用户是否合法并且返回授权后的token信息

  using System;
  using System.Collections.Generic;
  using System.ComponentModel.DataAnnotations;
  using System.Linq;
  using System.Threading.Tasks;
  using Microsoft.AspNetCore.Mvc;
  
  namespace JwtAuth.Controllers
  {
      using System.Security.Claims;
      using Microsoft.Extensions.Options;
      using Microsoft.IdentityModel.Tokens;
      using Microsoft.AspNetCore.Authentication.JwtBearer;
      //添加dll的引用 Nuget Microsoft.AspNetCore.Authentication.JwtBearer;
      using System.IdentityModel.Tokens.Jwt;
      [Route("Auth/[controller]")]
      public class AuthController : Controller
      {
          public JwtSettings settings;
          public AuthController(IOptions<JwtSettings> jwtsettings)
          {
              settings = jwtsettings.Value;
          }
          public IActionResult Token([FromBody]LoginInfo model)
          {
              if (ModelState.IsValid)
              {
                  if (model.username == "cyao" && model.password == "")
                  {
                      //用户合法情况
                      //添加授权信息
                      var claims = new Claim[] { new Claim(ClaimTypes.Name, "cyao"), new Claim(ClaimTypes.Role, "admin") };
                      var key = new SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes(settings.SecretKey));
                      var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
                      var token = new JwtSecurityToken(
                          settings.Issuer,
                          settings.Audience,
                          claims,
                          DateTime.Now,
                          DateTime.Now.AddMinutes(),//过期时间
                          creds);
                      return Ok(new { token = new JwtSecurityTokenHandler().WriteToken(token) });
                  }
              }
              return BadRequest();
          }
      }
      public class LoginInfo
      {
          [Required]
          public string username { get; set; }
          [Required]
          public string password { get; set; }
      }
  }