Asp.Net Core 2.0 多角色权限认证

在使用 WebForm 技术开发网站的时候，微软就提供了 Form 身份认证，这使得登录认证简单了许多，不同于 WebForm 以及后来的 Asp.Net Mvc，Asp.Net Core 中的身份认证与之前相比使用更加便捷，本文介绍 Asp.Net Core 2.0 多角色授权认证，首先我们需要在 Startup.cs 中开启授权认证相关模块（中间件），代码如下：

services.AddAuthentication(options=>{options.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;options.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;})
.AddCookie(options =>{options.LoginPath = "/Account/";options.Cookie.HttpOnly = true;});
services.AddTransient<HttpContextAccessor>();app.UseAuthentication();

之后，我们在登录模块编写多角色登录逻辑代码如下：

[HttpPost]
public async Task<IActionResult> Login(string userCode, string userPassword, int userType = 0, string returnUrl = "")
{if ((userCode.Trim().ToLower() == "admin" || userCode.Trim().ToLower() == "user") && userPassword.Trim().ToLower() == "123456"){var claimsIdentity = new ClaimsIdentity(CookieAuthenticationDefaults.AuthenticationScheme);claimsIdentity.AddClaim(new Claim(ClaimTypes.Sid, userCode));if (userType == RoleTypeEnum.UserType_Admin){claimsIdentity.AddClaim(new Claim(ClaimTypes.Role, RoleTypeEnum.Admin));}else{claimsIdentity.AddClaim(new Claim(ClaimTypes.Role, RoleTypeEnum.User));}var claimsPrincipal = new ClaimsPrincipal(claimsIdentity);await HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, claimsPrincipal, new AuthenticationProperties{ExpiresUtc = DateTime.UtcNow.AddMinutes(20)});if (!string.IsNullOrEmpty(returnUrl)){return this.Redirect(returnUrl);}else{if (userType == RoleTypeEnum.UserType_Admin){return this.Redirect(Url.Action("Index", "Home", new { area = "Admin" }));}else{return this.Redirect(Url.Action("Index", "Home", new { area = "User" }));}}}else{return this.Content(string.Format("<script>alert('用户名或者密码错误');location.href='{0}'</script>", Url.Action("Index", "Account")), "text/html;charset=utf8");}
}

本例只提供管理和普通用户两种角色类别，可以根据情况自由添加，接着，我们就可以在相关授权模块添加 Authorize 元属性来进行角色授权，代码如下：

// 管理员模块
[Authorize(Roles = RoleTypeEnum.Authorize_Admin)]
[Area("Admin")]
public class BaseController : Controller
{protected string userCode;public BaseController(IHttpContextAccessor contextAccessor){this.userCode = contextAccessor.HttpContext.User.FindFirst(ClaimTypes.Sid).Value;}protected void InitCookieViewData(){ViewData.Add("UserCode", this.userCode);}
}
// 用户模块
[Authorize(Roles = RoleTypeEnum.Authorize_User)]
[Area("User")]
public class BaseController : Controller
{protected string userCode;public BaseController(IHttpContextAccessor contextAccessor){this.userCode = contextAccessor.HttpContext.User.FindFirst(ClaimTypes.Sid).Value;}protected void InitCookieViewData(){ViewData.Add("UserCode", this.userCode);}
}

到此，多角色授权认证已经结束，而且我们也获得了登录的角色信息，退出登录的代码如下：

public async Task<IActionResult> Logout()
{await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);return this.Redirect(Url.Action("Index", "Account", new { area = "" }));
}

本文已提供案例下载地址。

原文地址：https://www.liziwu.net/topic/31.html

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