• WebAPI 用户认证防篡改实现HMAC(二)签名验证 AbsBaseAuthenticationAttribute--转


     1 public class ActionFilter : ActionFilterAttribute  
     2    {  
     3        public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)  
     4        {  
     5            base.OnActionExecuting(actionContext);  
     6            //获取请求消息提数据  
     7            Stream stream = actionContext.Request.Content.ReadAsStreamAsync().Result;  
     8            Encoding encoding = Encoding.UTF8;  
     9            stream.Position = 0;  
    10            string responseData = "";  
    11            using (StreamReader reader = new StreamReader(stream, encoding))  
    12            {  
    13                responseData = reader.ReadToEnd().ToString();  
    14            }  
    15            //反序列化进行处理  
    16            var serialize = new JavaScriptSerializer();  
    17            var obj = serialize.Deserialize<RequestDTO>(responseData);  
    18            //在action执行前终止请求时,应该使用填充方法Response,将不返回action方法体。  
    19            if (obj == null)  
    20                actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.OK, obj);  
    21   
    22            if (string.IsNullOrEmpty(obj.PhoneType) || string.IsNullOrEmpty(obj.PhoneVersion)  
    23                || string.IsNullOrEmpty(obj.PhoneID) || obj.StartCity < 1)  
    24            {  
    25                actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.OK, obj);  
    26            }  
    27        }  
    28    }  

     

     

    WebAPI 用户认证防篡改实现HMAC(二)签名验证 AbsBaseAuthenticationAttribute

    标签: c#WebAPI
     分类:
     

    WebAPI的用户身份认证与MVC一样都是通过Attribute进行验证,此处定义了一个抽象基类,子类需要实现根据合作号获取合作用户信息的抽象方法

    AbsBaseAuthenticationAttribute

        using System;
        using System.Web;
        using System.Collections.Specialized;
        using System.Net;
        using System.Net.Http;
        using System.Text.RegularExpressions;
        using System.Web.Http.Controllers;
        using System.Web.Http.Filters;
    
        /// <summary>
        /// WebAPI防篡改签名验证抽象基类Attribute
        /// </summary>
        public abstract class AbsBaseAuthenticationAttribute : ActionFilterAttribute
        {
            /// <summary>
            /// Occurs before the action method is invoked.
            /// </summary>
            /// <param name="actionContext">The action context</param>
            public override void OnActionExecuting(HttpActionContext actionContext)
            {
                //获取Asp.Net对应的Request
                var request = ((HttpContextWrapper)actionContext.Request.Properties["MS_HttpContext"]).Request;
                NameValueCollection getCollection = request.QueryString;//此签名要求Partner及Sign均通过QueryString传递
                if (getCollection != null && getCollection.Count > 0)
                {
                    string partner = getCollection[SecuritySignHelper.Partner];
                    string sign = getCollection[SecuritySignHelper.Sign];
                    if (!string.IsNullOrWhiteSpace(partner)//必须包含partner
                       && !string.IsNullOrWhiteSpace(sign)//必须包含sign
                       && Regex.IsMatch(sign, "^[0-9A-Za-z]{32}$"))//sign必须为32位Md5摘要
                    {
                        //获取partner对应的key
                        //这里暂时只做了合作key校验,不做访问权限校验,如有需要,此处可进行调整,建议RBAC
                        string partnerKey = this.GetPartnerKey(partner);
                        if (!string.IsNullOrWhiteSpace(partnerKey))
                        {
                            NameValueCollection postCollection = null;
                            switch (request.RequestType.ToUpper())
                            {
                                case "GET":
                                case "DELETE": break;//只是为了同时显示restful四种方式才有这部分无意义代码
                                //实际该以哪种方式进行请求应遵循restful标准
                                case "POST":
                                case "PUT":
                                    postCollection = request.Form;//post的数据必须通过application/x-www-form-urlencoded方式传递
                                    break;
                                default:
                                    throw new NotImplementedException();
                            }
                            //根据请求数据获取MD5签名
                            string vSign = getCollection.GetSecuritySign(partner, partnerKey, postCollection);
                            if (string.Equals(sign, vSign, StringComparison.OrdinalIgnoreCase))
                            {//验证通过,执行基类方法
                                base.OnActionExecuting(actionContext);
                                return;
                            }
                        }
                    }
                }
                //此处暂时以401返回,可调整为其它返回
                actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.Unauthorized);
                //actionContext.Response = new HttpResponseMessage(HttpStatusCode.Unauthorized);
            }
    
            /// <summary>
            /// 获取合作号对应的合作Key,如果未能获取,则返回空字符串或者null
            /// </summary>
            /// <param name="partner"></param>
            /// <returns></returns>
            protected abstract string GetPartnerKey(string partner);
        }

    子类例子
        public class AuthenticationAttribute : AbsBaseAuthenticationAttribute
        {
            protected override string GetPartnerKey(string partner)
            {
                //TODO:从缓存中或者其它地方读取数据
                return "bbb";
            }
        }
    实际可以在需要身份验证的ApiController上增加[Authentication],也可以写一个基类,然后需要身份验证的ApiController继承自该基类
        [Authentication]
        public class ApiControllerBase : ApiController
        {
        }

    当然如果项目中所有的api都需要进行签名访问,那么直接可以进行注册,就不需要上面的ApiControllerBase了

        config.Filters.Add(new AuthenticationAttribute());  
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  • 原文地址:https://www.cnblogs.com/micro-chen/p/5999130.html
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