基于.Net Framework 4.0 Web API开发(4):ASP.…

2018-06-22 06:00:57来源:未知 阅读 ()

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概述: 

  ASP.NET Web API 的好用使用过的都知道,没有复杂的配置文件,一个简单的ApiController加上需要的Action就能工作。但是在使用API的时候总会遇到跨域请求的问题, 特别各种APP万花齐放的今天,对API使用者身份角色验证是不能避免的(完全开发的API不需要对使用者身份角色进行管控,可以绕过),这篇文章就来谈谈基于令牌TOKEN身份验证的实现。

问题:

   对于Web API的选择性的开放,使用者无论使用AJAX,还是HttpClient对接,总要对使用者的身份角色进行验证,然而使用API总有跨域使用情况的存在,这样就导致所有基于cookie验证方式都不再适用于API的验证。

原因:

  比如,基于form表单验证的基础是登录验证成功后,用户的信息存在缓存或数据库或cookie,无论哪种方式存储用户信息,都不能绕过对cookie的使用,所以form表单验证方法对于禁用cookie的浏览器都不能正常使用,结论就是不能使用cookie 的环境就不能使用基本的form表单验证方式。因此WEB API 由于跨域的使用,导致cookie不能正常工作,所以不能再使用基于表单验证的方式来实现。

基于令牌TOKEN验证方法的实现:

方法一:

     1. 实现对缓存TOKEN的管理,以防IIS服务器的宕机,可以对TOKEN进行持久化存储处理,每次IIS重启重新初始化已经登录成功TOKEN缓存。实现如下:

  1 public class UserTokenManager
  2     {
  3         private static readonly IUserTokenRepository _tokenRep;
  4         private const string TOKENNAME = "PASSPORT.TOKEN";
  5 
  6         static UserTokenManager()
  7         {
  8             _tokenRep = ContainerManager.Resolve<IUserTokenRepository>();
  9         }
 10         /// <summary>
 11         /// 初始化缓存
 12         /// </summary>
 13         private static List<UserToken> InitCache()
 14         {
 15             if (HttpRuntime.Cache[TOKENNAME] == null)
 16             {
 17                 var tokens = _tokenRep.GetAll();
 18                 // cache 的过期时间, 令牌过期时间 *2
 19                 HttpRuntime.Cache.Insert(TOKENNAME, tokens, null, System.Web.Caching.Cache.NoAbsoluteExpiration, TimeSpan.FromDays(7 * 2));
 20             }
 21             var ts = (List<UserToken>)HttpRuntime.Cache[TOKENNAME];
 22             return ts;
 23         }
 24 
 25 
 26         public static int GetUId(string token)
 27         {
 28             var tokens = InitCache();
 29             var result = 0;
 30             if (tokens.Count > 0)
 31             {
 32                 var id = tokens.Where(c => c.Token == token).Select(c => c.UId).FirstOrDefault();
 33                 if (id != null)
 34                     result = id.Value;
 35             }
 36             return result;
 37         }
 38 
 39 
 40         public static string GetPermission(string token)
 41         {
 42             var tokens = InitCache();
 43             if (tokens.Count == 0)
 44                 return "NoAuthorize";
 45             else
 46                 return tokens.Where(c => c.Token == token).Select(c => c.Permission).FirstOrDefault();
 47         }
 48 
 49         public static string GetUserType(string token)
 50         {
 51             var tokens = InitCache();
 52             if (tokens.Count == 0)
 53                 return "";
 54             else
 55                 return tokens.Where(c => c.Token == token).Select(c => c.UserType).FirstOrDefault();
 56         }
 57 
 58         /// <summary>
 59         /// 判断令牌是否存在
 60         /// </summary>
 61         /// <param name="token"></param>
 62         /// <returns></returns>
 63         public static bool IsExistToken(string token)
 64         {
 65             var tokens = InitCache();
 66             if (tokens.Count == 0) return false;
 67             else
 68             {
 69                 var t = tokens.Where(c => c.Token == token).FirstOrDefault();
 70                 if (t == null)
 71                     return false;
 72                 else if (t.Timeout < DateTime.Now)
 73                 {
 74                     RemoveToken(t);
 75                     return false;
 76                 }
 77                 else
 78                 {
 79                     // 小于8小时 更新过期时间
 80                     if ((t.Timeout - DateTime.Now).TotalMinutes < 1 * 60 - 1)
 81                     {
 82                         t.Timeout = DateTime.Now.AddHours(8);
 83                         UpdateToken(t);
 84                     }
 85                     return true;
 86                 }
 87 
 88             }
 89         }
 90 
 91         /// <summary>
 92         /// 添加令牌, 没有则添加,有则更新
 93         /// </summary>
 94         /// <param name="token"></param>
 95         public static void AddToken(UserToken token)
 96         {
 97             var tokens = InitCache();
 98             // 不存在  怎增加
 99             if (!IsExistToken(token.Token))
100             {
101                 token.ID = 0;
102                 tokens.Add(token);
103                 // 插入数据库
104                 _tokenRep.Add(token);
105             }
106             else  // 有则更新
107             {
108                 UpdateToken(token);
109             }
110         }
111 
112         public static bool UpdateToken(UserToken token)
113         {
114             var tokens = InitCache();
115             if (tokens.Count == 0) return false;
116             else
117             {
118                 var t = tokens.Where(c => c.Token == token.Token).FirstOrDefault();
119                 if (t == null)
120                     return false;
121                 t.Timeout = token.Timeout;
122                 // 更新数据库
123                 var tt = _tokenRep.FindByToken(token.Token);
124                 if (tt != null)
125                 {
126                     tt.UserType = token.UserType;
127                     tt.UId = token.UId;
128                     tt.Permission = token.Permission;
129                     tt.Timeout = token.Timeout;
130                     _tokenRep.Update(tt);
131                 }
132                 return true;
133             }
134         }
135         /// <summary>
136         /// 移除指定令牌
137         /// </summary>
138         /// <param name="token"></param>
139         /// <returns></returns>
140         public static void RemoveToken(UserToken token)
141         {
142             var tokens = InitCache();
143             if (tokens.Count == 0) return;
144             tokens.Remove(token);
145             _tokenRep.Remove(token);
146         }
147 
148         public static void RemoveToken(string token)
149         {
150             var tokens = InitCache();
151             if (tokens.Count == 0) return;
152 
153             var ts = tokens.Where(c => c.Token == token).ToList();
154             foreach (var t in ts)
155             {
156                 tokens.Remove(t);
157                 var tt = _tokenRep.FindByToken(t.Token);
158                 if (tt != null)
159                     _tokenRep.Remove(tt);
160             }
161         }
162 
163 
164         public static void RemoveToken(int uid)
165         {
166             var tokens = InitCache();
167             if (tokens.Count == 0) return;
168 
169             var ts = tokens.Where(c => c.UId == uid).ToList();
170             foreach (var t in ts)
171             {
172                 tokens.Remove(t);
173                 var tt = _tokenRep.FindByToken(t.Token);
174                 if (tt != null)
175                     _tokenRep.Remove(tt);
176             }
177         }
178     }
View Code

     2. 新建ApiAuthorizeAttribute类,继承AuthorizeAttribute,重写方法IsAuthorized,这样基于TOKEN验证方式就完成了。实现如下:

 1   public class ApiAuthorizeAttribute : AuthorizeAttribute
 2     {
 3         protected override bool IsAuthorized(HttpActionContext actionContext)
 4         {
 5             // 验证token
 6             //var token = actionContext.Request.Headers.Authorization;
 7             var ts = actionContext.Request.Headers.Where(c => c.Key.ToLower() == "token").FirstOrDefault().Value;
 8             if (ts != null && ts.Count() > 0)
 9             {
10                 var token = ts.First<string>();
11                 // 验证token
12                 if (!UserTokenManager.IsExistToken(token))
13                 {
14                     return false;
15                 }
16                 return true;
17             }
18 
19             if (actionContext.Request.Method == HttpMethod.Options)
20                 return true;
21             return false;
22         }
23     }
View Code

     3. 登录实现

  1     /// <summary>
  2     /// 账户
  3     /// </summary>
  4     public class AccountController : ApiController
  5     {
  6         /// <summary>
  7         /// 登录
  8         /// </summary>
  9         /// <param name="user">登录人员信息: 账号,密码 ,是否记住密码</param>
 10         /// <returns></returns>
 11         [HttpPost]
 12         [AllowAnonymous]
 13         public ResultData Login([FromBody]LoginUser user)
 14         {
 15             string mobile = user.Mobile;
 16             string password = user.Password;
 17             bool IsRememberMe = user.IsRememberMe;
 18 
 19             if (string.IsNullOrEmpty(mobile) || string.IsNullOrEmpty(password))
 20                 return new ResultData(((int)LoginResultEnum.UserNameOrPasswordError), EnumExtension.GetEnumDescription(LoginResultEnum.UserNameOrPasswordError));
 21 
 22             User u=null;
 23             IMembershipService membershipSvc = ContainerManager.Container.Resolve<IMembershipService>();
 24             LoginResultEnum loginResult = membershipSvc.Login(mobile, password, out u);
 25             if (loginResult == LoginResultEnum.Success)
 26             {
 27                 //SetAuthenticationTicket(u, IsRememberMe);
 28 
 29                 // token   处理
 30                 UserTokenManager.RemoveToken(u.ID);
 31                 // 生成新Token
 32                 var token = Utility.MD5Encrypt(string.Format("{0}{1}", Guid.NewGuid().ToString("D"), DateTime.Now.Ticks));
 33                 // token过期时间
 34                 int timeout = 8;
 35                 if (!int.TryParse(ConfigurationManager.AppSettings["TokenTimeout"], out timeout))
 36                     timeout = 8;
 37                 // 创建新token
 38                 var ut = new UserToken()
 39                 {
 40                     Token = token,
 41                     Timeout = DateTime.Now.AddHours(timeout),
 42                     UId = u.ID,
 43                     UserType = (u.IsSaler.HasValue && u.IsSaler.Value) ? "Saler" : "Vip"
 44                 };
 45 
 46                 UserTokenManager.AddToken(ut);
 47 
 48 
 49                 // 登录log
 50                 var logRep = ContainerManager.Container.Resolve<ISysLogRepository>();
 51                 var log = new Log()
 52                 {
 53                     Action = "Login",
 54                     Detail = "会员登录:" + u.Mobile + "|" + u.Name,
 55                     CreateDate = DateTime.Now,
 56                     CreatorLoginName = u.Mobile,
 57                     IpAddress = GetClientIp(this.Request)
 58                 };
 59 
 60                 logRep.Add(log);
 61 
 62                 var data = new
 63                 {
 64                     id = u.ID,
 65                     issaler = u.IsSaler.HasValue ? u.IsSaler.Value : false,
 66                     mobile = u.Mobile,
 67                     token = token
 68                 };
 69                 var result = new ResultData(data);
 70                 result.desc = "登录成功";
 71                 return result;
 72             }
 73 
 74             if (loginResult == LoginResultEnum.UserNameUnExists)
 75             {
 76                 return new ResultData(((int)LoginResultEnum.UserNameUnExists), EnumExtension.GetEnumDescription(LoginResultEnum.UserNameUnExists));
 77             }
 78             if (loginResult == LoginResultEnum.VerifyCodeError)
 79             {
 80                 return new ResultData(((int)LoginResultEnum.VerifyCodeError), EnumExtension.GetEnumDescription(LoginResultEnum.VerifyCodeError));
 81             }
 82             if (loginResult == LoginResultEnum.UserNameOrPasswordError)
 83             {
 84                 return new ResultData(((int)LoginResultEnum.UserNameOrPasswordError), EnumExtension.GetEnumDescription(LoginResultEnum.UserNameOrPasswordError));
 85             }
 86             return new ResultData(ResultType.UnknowError, "登录失败,原因未知");
 87         }
 88         /// <summary>
 89         /// 退出当前账号
 90         /// </summary>
 91         /// <returns></returns>
 92         [HttpPost]
 93         public ResultData SignOut()
 94         {
 95             // 登录log
 96             var logRep = ContainerManager.Resolve<ISysLogRepository>();
 97             var log = new Log()
 98             {
 99                 Action = "SignOut",
100                 Detail = "会员退出:" + RISContext.Current.CurrentUserInfo.UserName,
101                 CreateDate = DateTime.Now,
102                 CreatorLoginName = RISContext.Current.CurrentUserInfo.UserName,
103                 IpAddress = GetClientIp(this.Request)
104             };
105             logRep.Add(log);
106             //System.Web.Security.FormsAuthentication.SignOut();
107             UserTokenManager.RemoveToken(this.Token);
108             return new ResultData(ResultType.Success, "退出成功");
109         }
110     }
View Code

    4. 测试API

         这样就可以配合.NET原有的 AllowAnonymousAttribute 属性使用, 使用方法如下:
         不需要验证身份的 类或者Action 添加  [AllowAnonymous]属性,否则添加[ApiAuthorize]

 1     /// <summary>
 2     /// 测试
 3     /// </summary>
 4     [ApiAuthorize]
 5     public class TestController : BaseApiController
 6     {
 7         /// <summary>
 8         /// 测试权限1
 9         /// </summary>
10         [HttpGet]
11         public string TestAuthorize1()
12         {
13             return "TestAuthorize1";
14         }
15         /// <summary>
16         /// 测试权限2
17         /// </summary>
18         [AllowAnonymous]
19         [HttpGet]
20         public string TestAuthorize2()
21         {
22             return "TestAuthorize2";
23         }
24     }

 

测试一:

 1 //TestAuthorize
 2 function TestAuthorize1() {
 3     $.ajax({
 4         type: "get",
 5         url: host + "/mobileapi/test/TestAuthorize1",
 6         dataType: "text",
 7         data: {},
 8         beforeSend: function (request) {
 9             request.setRequestHeader("token", $("#token").val());  // 请求发起前在头部附加token
10         },
11         success: function (data) {
12             alert(data);
13         },
14         error: function (x, y, z) {
15             alert("报错无语");
16         }
17     });
18 }

     结果如下:

 

测试二:

 1 //TestAuthorize
 2 function TestAuthorize2() {
 3     $.ajax({
 4         type: "get",
 5         url: host + "/mobileapi/test/TestAuthorize2",
 6         dataType: "text",
 7         data: {},
 8         beforeSend: function (request) {
 9             request.setRequestHeader("token", $("#token").val());  // 请求发起前在头部附加token
10         },
11         success: function (data) {
12             alert(data);
13         },
14         error: function (x, y, z) {
15             alert("报错无语");
16         }
17     });
18 }

    结果如下:

 

测试三:

 1 //TestAuthorize
 2 function TestAuthorize1() {
 3     $.ajax({
 4         type: "get",
 5         url: host + "/mobileapi/test/TestAuthorize1",
 6         dataType: "text",
 7         data: {},
 8         beforeSend: function (request) {
 9             //request.setRequestHeader("token", $("#token").val());  // 请求发起前在头部附加token
10         },
11         success: function (data) {
12             alert(data);
13         },
14         error: function (x, y, z) {
15             alert("报错无语");
16         }
17     });
18 }

     结果如下:

 

测试四:

 1 //TestAuthorize
 2 function TestAuthorize2() {
 3     $.ajax({
 4         type: "get",
 5         url: host + "/mobileapi/test/TestAuthorize2",
 6         dataType: "text",
 7         data: {},
 8         beforeSend: function (request) {
 9             //request.setRequestHeader("token", $("#token").val());  // 请求发起前在头部附加token
10         },
11         success: function (data) {
12             alert(data);
13         },
14         error: function (x, y, z) {
15             alert("报错无语");
16         }
17     });
18 }

    结果如下:


方法二:

   此方法缺点就是每次请求都需要附带token请求参数,这对于有强迫症的程序猿来说是一种折磨,不细说,实现代码如下,有需要的自己研究研究:

 1     /// <summary>
 2     /// 用户令牌验证
 3     /// </summary>
 4     public class TokenAuthorizeAttribute : ActionFilterAttribute
 5     {
 6         private const string UserToken = "token";
 7         public override void OnActionExecuting(HttpActionContext actionContext)
 8         {
 9             // 匿名访问验证
10             var anonymousAction = actionContext.ActionDescriptor.GetCustomAttributes<AllowAnonymousAttribute>();
11             if (!anonymousAction.Any())
12             {
13                 // 验证token
14                 var token = TokenVerification(actionContext);
15             }
16             base.OnActionExecuting(actionContext);
17         }
18 
19         /// <summary>
20         /// 身份令牌验证
21         /// </summary>
22         /// <param name="actionContext"></param>
23         protected virtual string TokenVerification(HttpActionContext actionContext)
24         {
25             string msg = "";
26             // 获取token
27             var token = GetToken(actionContext, out msg);
28             if (!string.IsNullOrEmpty(msg))
29                 actionContext.Response = actionContext.Request.CreateResponse<NoAuthData>(System.Net.HttpStatusCode.OK, new NoAuthData() { code = "401", msg = msg });
30             // 判断token是否有效
31             if (!UserTokenManager.IsExistToken(token))
32             {
33                 actionContext.Response = actionContext.Request.CreateResponse<NoAuthData>(System.Net.HttpStatusCode.OK, new NoAuthData() { code = "401", msg = "Token已失效,请重新登录!" });
34                 //actionContext.Response = actionContext.Request.CreateResponse<NoAuthData>(System.Net.HttpStatusCode.Unauthorized, new NoAuthData() { code = "401", msg = "Token已失效,请重新登录!" });
35                 // actionContext.Response = actionContext.Request.CreateErrorResponse(System.Net.HttpStatusCode.Unauthorized, "Token已失效,请重新登录!");
36             }
37 
38             return token;
39         }
40 
41         private string GetToken(HttpActionContext actionContext, out string msg)
42         {
43             Dictionary<string, object> actionArguments = actionContext.ActionArguments;
44             HttpMethod type = actionContext.Request.Method;
45             msg = "";
46             var token = "";
47             if (type == HttpMethod.Post)
48             {
49                 if (actionArguments.ContainsKey(UserToken))
50                 {
51                     if (actionArguments[UserToken] != null)
52                         token = actionArguments[UserToken].ToString();
53                 }
54                 else
55                 {
56                     foreach (var value in actionArguments.Values)
57                     {
58                         if (value != null && value.GetType().GetProperty(UserToken) != null)
59                             token = value.GetType().GetProperty(UserToken).GetValue(value, null).ToString();
60                     }
61                 }
62 
63                 if (string.IsNullOrEmpty(token))
64                     msg = "登录超时,请重新登录!";
65             }
66             else if (type == HttpMethod.Get)
67             {
68                 if (!actionArguments.ContainsKey(UserToken))
69                     msg = "还未登录";
70                 // throw new HttpException(401, "还未登录");
71 
72                 if (actionArguments[UserToken] != null)
73                     token = actionArguments[UserToken].ToString();
74                 else
75                     msg = "登录超时,请重新登录!";
76             }
77             else
78             {
79                 throw new HttpException(404, "暂未开放除POST,GET之外的访问方式!");
80             }
81             return token;
82         }
83     }
84 
85     public class NoAuthData
86     {
87         public string code { get; set; }
88         public string msg { get; set; }
89     }
View Code


此篇到此结束,欢迎大家讨论!

 

  

 

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