.NET CORE 鉴权的实现示例

 public static class AuthenticationHttpContextExtensions
 {
   public static Task SignInAsync(this HttpContext context, string scheme, ClaimsPrincipal principal, AuthenticationProperties properties) 
   {
       context.RequestServices.GetRequiredService<IAuthenticationService>().SignInAsync(context, scheme, principal, properties);
   }         
 }

 public interface IAuthenticationService
 {
   //查询鉴权
   Task<AuthenticateResult> AuthenticateAsync(HttpContext context, string scheme);
 
   //登录写入鉴权凭证
   Task SignInAsync(HttpContext context, string scheme, ClaimsPrincipal principal, AuthenticationProperties properties);
     
    //退出登录清理凭证
   Task SignOutAsync(HttpContext context, string scheme, AuthenticationProperties properties);
   
   Task ChallengeAsync(HttpContext context, string scheme, AuthenticationProperties properties);
   
   Task ForbidAsync(HttpContext context, string scheme, AuthenticationProperties properties);
 }

public virtual async Task SignInAsync(HttpContext context, string scheme, ClaimsPrincipal principal, AuthenticationProperties properties)
{      
   if (scheme == null)
    {
        //IAuthenticationSchemeProvider实例
        var defaultScheme = await Schemes.GetDefaultSignInSchemeAsync();
        scheme = defaultScheme?.Name;
    }

  //IAuthenticationHandlerProvider实例获取处理器
  var handler = await Handlers.GetHandlerAsync(context, scheme);
  var signInHandler = handler as IAuthenticationSignInHandler;
  
  //各自的处理器handler 
  //例如使用Cookie 就会注入一个CookieAuthenticationHandler
  //使用Jwt 就注入一个JwtBearerHandler
  await signInHandler.SignInAsync(principal, properties);
}

   //核心源码就是AuthenticationMiddleware中间件
   app.UseAuthentication();

services.AddAuthentication(options =>
{
     //CookieAuthenticationDefaults.AuthenticationScheme == "Cookies"
     options.DefaultAuthenticateScheme = "Cookies";
     options.DefaultSignInScheme = "Cookies";
}).AddCookie();

    
  [AllowAnonymous]
  public async Task<IActionResult> Login(string name, string passWord)
  {
      if(name!="Admin" && password!="000000")
      {
         var result = new JSONResult(new{ Result = false,Message = "登录失败"});
         return result;
      }
     //Claims  ⫋ ClaimsIdentity ⫋ ClaimsPrincipal
     var claimIdentity = new ClaimsIdentity("ClaimsIdentity");
     claimIdentity.AddClaim(new Claim(ClaimTypes.Name, name));
     claimIdentity.AddClaim(new Claim(ClaimTypes.Address, "地址信息"));
     
     AuthenticationProperties ap = new AuthenticationProperties();
     ClaimsPrincipal claimsPrincipal = new ClaimsPrincipal(claimIdentity);
     await base.HttpContext.SignInAsync("Cookies",claimsPrincipal , ap)
     return new jsonResult(new{ Result = false,Message = "登录成功"});
  }

public class CoreAuthorizationHandler : IAuthenticationHandler
,IAuthenticationSignInHandler, IAuthenticationSignOutHandler
{
      public AuthenticationScheme Scheme { get; private set; }
      protected HttpContext Context { get; private set; }
      public Task InitializeAsync(AuthenticationScheme scheme, HttpContext context)
      {
          Scheme = scheme;
          Context = context;
          return Task.CompletedTask;
      }
      
     public async Task<AuthenticateResult> AuthenticateAsync()
     {
        var cookie = Context.Request.Cookies["CustomCookie"];
        if (string.IsNullOrEmpty(cookie))
        {
            return AuthenticateResult.NoResult();
        }
        AuthenticateResult result = AuthenticateResult
        .Success(Deserialize(cookie));
        return  await Task.FromResult(result);
    }
    
     public Task ChallengeAsync(AuthenticationProperties properties)
     {
          return Task.CompletedTask;
     }

     public Task ForbidAsync(AuthenticationProperties properties)
     {
          Context.Response.StatusCode = 403;
          return Task.CompletedTask;
     }
        
         public Task SignInAsync(ClaimsPrincipal user, AuthenticationProperties properties)
        {
            var ticket = new AuthenticationTicket(user, properties, Scheme.Name);
            Context.Response.Cookies.Append("CoreAuthorizationHandlerCookies", Serialize(ticket));
            return Task.CompletedTask;
        }

     public Task SignOutAsync(AuthenticationProperties properties)
     {
            Context.Response.Cookies.Delete("CoreAuthorizationHandlerCookies");
            return Task.CompletedTask;
     }
        
     private AuthenticationTicket Deserialize(string content)
     {
         byte[] byteTicket = System.Text.Encoding.Default.GetBytes(content);
         return TicketSerializer.Default.Deserialize(byteTicket);
     }
     private string Serialize(AuthenticationTicket ticket)
     {
        //需要引入  Microsoft.AspNetCore.Authentication
        byte[] byteTicket = TicketSerializer.Default.Serialize(ticket);
        return Encoding.Default.GetString(byteTicket);
     }
}

services.AddAuthenticationCore(options =>
{
   options.AddScheme<CoremvcAuthenticationHandler>("AuthenticationScheme", "AuthenticationScheme");
});