using JiepeiWMS.Common.Helper;
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using JiepeiWMS.IServices;
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using Microsoft.AspNetCore.Authentication;
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using Microsoft.AspNetCore.Authorization;
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using Microsoft.AspNetCore.Http;
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using Microsoft.Extensions.DependencyInjection;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Security.Claims;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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namespace JiepeiWMS.AuthHelper
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{
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/// <summary>
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/// 权限授权处理器
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/// </summary>
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public class PermissionHandler : AuthorizationHandler<PermissionRequirement>
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{
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/// <summary>
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/// 验证方案提供对象
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/// </summary>
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public IAuthenticationSchemeProvider Schemes { get; set; }
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private readonly IRoleModulePermissionServices _roleModulePermissionServices;
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private readonly IHttpContextAccessor _accessor;
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/// <summary>
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/// 构造函数注入
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/// </summary>
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/// <param name="schemes"></param>
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/// <param name="roleModulePermissionServices"></param>
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/// <param name="accessor"></param>
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public PermissionHandler(IAuthenticationSchemeProvider schemes, IRoleModulePermissionServices roleModulePermissionServices, IHttpContextAccessor accessor)
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{
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_accessor = accessor;
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Schemes = schemes;
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_roleModulePermissionServices = roleModulePermissionServices;
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}
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// 重写异步处理程序
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protected override async Task HandleRequirementAsync(AuthorizationHandlerContext context, PermissionRequirement requirement)
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{
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var httpContext = _accessor.HttpContext;
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// 获取系统中所有的角色和菜单的关系集合
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if (!requirement.Permissions.Any())
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{
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var data = await _roleModulePermissionServices.RoleModuleMaps();
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var list = new List<PermissionItem>();
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// ids4和jwt切换
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// ids4
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if (Permissions.IsUseIds4)
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{
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list = (from item in data
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where item.IsDeleted == false
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orderby item.Id
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select new PermissionItem
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{
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Url = item.Module?.LinkUrl,
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Role = item.Role?.Id.ObjToString(),
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}).ToList();
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}
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// jwt
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else
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{
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list = (from item in data
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where item.IsDeleted == false
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orderby item.Id
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select new PermissionItem
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{
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Url = item.Module?.LinkUrl,
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Role = item.Role?.Name.ObjToString(),
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}).ToList();
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}
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requirement.Permissions = list;
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}
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if (httpContext != null)
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{
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var questUrl = httpContext.Request.Path.Value.ToLower();
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// 整体结构类似认证中间件UseAuthentication的逻辑，具体查看开源地址
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// https://github.com/dotnet/aspnetcore/blob/master/src/Security/Authentication/Core/src/AuthenticationMiddleware.cs
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httpContext.Features.Set<IAuthenticationFeature>(new AuthenticationFeature
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{
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OriginalPath = httpContext.Request.Path,
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OriginalPathBase = httpContext.Request.PathBase
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});
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// Give any IAuthenticationRequestHandler schemes a chance to handle the request
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// 主要作用是: 判断当前是否需要进行远程验证，如果是就进行远程验证
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var handlers = httpContext.RequestServices.GetRequiredService<IAuthenticationHandlerProvider>();
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foreach (var scheme in await Schemes.GetRequestHandlerSchemesAsync())
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{
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if (await handlers.GetHandlerAsync(httpContext, scheme.Name) is IAuthenticationRequestHandler handler && await handler.HandleRequestAsync())
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{
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context.Fail();
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return;
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}
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}
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//判断请求是否拥有凭据，即有没有登录
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var defaultAuthenticate = await Schemes.GetDefaultAuthenticateSchemeAsync();
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if (defaultAuthenticate != null)
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{
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var result = await httpContext.AuthenticateAsync(defaultAuthenticate.Name);
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//result?.Principal不为空即登录成功
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if (result?.Principal != null)
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{
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httpContext.User = result.Principal;
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// 获取当前用户的角色信息
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var currentUserRoles = new List<string>();
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// ids4和jwt切换
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// ids4
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if (Permissions.IsUseIds4)
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{
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currentUserRoles = (from item in httpContext.User.Claims
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where item.Type == "role"
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select item.Value).ToList();
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}
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else
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{
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// jwt
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currentUserRoles = (from item in httpContext.User.Claims
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where item.Type == requirement.ClaimType
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select item.Value).ToList();
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}
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var isMatchRole = false;
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var permisssionRoles = requirement.Permissions.Where(w => currentUserRoles.Contains(w.Role));
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foreach (var item in permisssionRoles)
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{
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try
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{
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if (Regex.Match(questUrl, item.Url?.ObjToString().ToLower())?.Value == questUrl)
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{
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isMatchRole = true;
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break;
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}
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}
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catch (Exception)
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{
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// ignored
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}
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}
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//验证权限
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if (currentUserRoles.Count <= 0 || !isMatchRole)
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{
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context.Fail();
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return;
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}
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var isExp = false;
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// ids4和jwt切换
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// ids4
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if (Permissions.IsUseIds4)
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{
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isExp = (httpContext.User.Claims.SingleOrDefault(s => s.Type == "exp")?.Value) != null && DateHelper.StampToDateTime(httpContext.User.Claims.SingleOrDefault(s => s.Type == "exp")?.Value) >= DateTime.Now;
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}
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else
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{
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// jwt
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isExp = (httpContext.User.Claims.SingleOrDefault(s => s.Type == ClaimTypes.Expiration)?.Value) != null && DateTime.Parse(httpContext.User.Claims.SingleOrDefault(s => s.Type == ClaimTypes.Expiration)?.Value) >= DateTime.Now;
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}
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if (isExp)
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{
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context.Succeed(requirement);
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}
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else
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{
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context.Fail();
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return;
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}
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return;
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}
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}
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//判断没有登录时，是否访问登录的url,并且是Post请求，并且是form表单提交类型，否则为失败
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if (!(questUrl.Equals(requirement.LoginPath.ToLower(), StringComparison.Ordinal) && (!httpContext.Request.Method.Equals("POST") || !httpContext.Request.HasFormContentType)))
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{
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context.Fail();
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return;
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}
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}
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//context.Succeed(requirement);
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}
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}
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}
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