.NET Core 之 自定义策咯

services.AddAuthorization(options =>
            {
                options.AddPolicy("AdminPolicy",
                    policyBuilder => policyBuilder
                    .RequireRole("Admin")//Claim的Role是Admin
                    .RequireUserName("Eleven")//Claim的Name是Eleven
                    .RequireClaim(ClaimTypes.Email)//必须有某个Cliam
                    //.Combine(qqEmailPolicy)
                    );//内置

                options.AddPolicy("UserPolicy",
                    policyBuilder => policyBuilder.RequireAssertion(context =>
                    context.User.HasClaim(c => c.Type == ClaimTypes.Role)
                    && context.User.Claims.First(c => c.Type.Equals(ClaimTypes.Role)).Value == "Admin")
               //.Combine(qqEmailPolicy)
               );//自定义
                //policy层面  没有Requirements


                //options.AddPolicy("QQEmail", policyBuilder => policyBuilder.Requirements.Add(new QQEmailRequirement()));
                options.AddPolicy("DoubleEmail", policyBuilder => policyBuilder.Requirements.Add(new DoubleEmailRequirement()));
            });
            services.AddSingleton<IAuthorizationHandler, ZhaoxiMailHandler>();
            services.AddSingleton<IAuthorizationHandler, QQMailHandler>();

上面是系统自带的策略，但是这种情况可能比较鸡肋。那么自定义策略使得比较灵活。

自定义 策略，继承 IAuthorizationRequirement，在 HandleRequirementAsync 实现自己自定义的策略规则，比如下面是实现用户信息，支持2种用户邮箱才允许访问特定页面或接口等。

 /// <summary>
    /// 两种邮箱都能支持 
    /// 
    /// </summary>
    public class DoubleEmailRequirement : IAuthorizationRequirement
    {
    }

    public class QQMailHandler : AuthorizationHandler<DoubleEmailRequirement>
    {
        protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, DoubleEmailRequirement requirement)
        {
            if (context.User != null && context.User.HasClaim(c => c.Type == ClaimTypes.Email))
            {
                var email = context.User.FindFirst(c => c.Type == ClaimTypes.Email).Value;
                if (email.EndsWith("@qq.com", StringComparison.OrdinalIgnoreCase))
                {
                    context.Succeed(requirement);
                }
                else
                {
                    //context.Fail();//不设置失败
                }
            }
            return Task.CompletedTask;
        }
    }
    public class ZhaoxiMailHandler : AuthorizationHandler<DoubleEmailRequirement>
    {
        protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, DoubleEmailRequirement requirement)
        {
            if (context.User != null && context.User.HasClaim(c => c.Type == ClaimTypes.Email))
            {
                var email = context.User.FindFirst(c => c.Type == ClaimTypes.Email).Value;
                if (email.EndsWith("@ZhaoxiEdu.Net", StringComparison.OrdinalIgnoreCase))
                {
                    context.Succeed(requirement);
                }
                else
                {
                    //context.Fail();
                }
            }
            return Task.CompletedTask;
        }
    }

登录过后，会根据用户信息对比策略中信息。

    [Authorize(AuthenticationSchemes = "Cookies", Policy = "AdminPolicy")]
        public IActionResult InfoAdminPolicy()
        {
            return View();
        }
        [Authorize(AuthenticationSchemes = "Cookies", Policy = "UserPolicy")]
        public IActionResult InfoUserPolicy()
        {
            return View();
        }

        [Authorize(AuthenticationSchemes = "Cookies", Policy = "QQEmail")]
        public IActionResult InfoQQEmail()
        {
            return View();
        }

        [Authorize(AuthenticationSchemes = "Cookies", Policy = "DoubleEmail")]
        public IActionResult InfoDoubleEmail()
        {
            return View();
        }

　　用户登录 信息

 [AllowAnonymous]
        public async Task<IActionResult> LoginCustomScheme(string name, string password)
        {
            //base.HttpContext.RequestServices.
            //IAuthenticationService

            if ("ElevenCustomScheme".Equals(name, StringComparison.CurrentCultureIgnoreCase)
                && password.Equals("123456"))
            {
                var claimIdentity = new ClaimsIdentity("Custom");
                claimIdentity.AddClaim(new Claim(ClaimTypes.Name, name));
                claimIdentity.AddClaim(new Claim(ClaimTypes.Email, "xuyang@ZhaoxiEdu.Net"));
                await base.HttpContext.SignInAsync("CustomScheme", new ClaimsPrincipal(claimIdentity), new AuthenticationProperties
                {
                    ExpiresUtc = DateTime.UtcNow.AddMinutes(30),
                });//登录为默认的scheme  cookies
                return new JsonResult(new
                {
                    Result = true,
                    Message = "登录成功"
                });
            }
            else
            {
                await Task.CompletedTask;
                return new JsonResult(new
                {
                    Result = false,
                    Message = "登录失败"
                });
            }
        }