1、初衷

开发中经常需要做一些接口的签名生成和校验工作，最开始的时候都是每个接口去按照约定单独实现，久而久之就变的非常难维护，因此就琢磨怎么能够写了一个比较通用的签名生成工具。

2、思路

采用链式调用的方式，使得签名的步骤可以动态拼凑组合。

3、直接看效果

    //设置数据源
    var signSource = new Dictionary<string, string>()
    {
        { "param1", "1" },
        { "param3", "3+" },
        { "param2", "2" }
    };
    var signer = new HttpSigner();
    signer.SetSignData(signSource);

    //设置数据源并配置规则
    signer.SetSignData(signSource, setting =>
    {
        //按参数名排序
        //result --> param1 param2 param3
        setting.IsOrderByWithKey = false;

        //是否对签名数据的参数值进行UrlEncode
        setting.IsDoUrlEncodeForSourceValue = false;

        //签名主体是否包含参数名
        setting.IsSignTextContainKey = true;
        //签名主体中参数和参数值的连接符（需要启用IsSignTextContainKey）
        setting.SignTextKeyValueSeparator = "=";
        //签名主体中不同参数项的连接符
        setting.SignTextItemSeparator = "&";
        //以上都开启后  --> param1=1&param2=2&param3=3

        //编码
        setting.DefaultEncoding = Encoding.UTF8;
    });

    //签名主体设置前缀
    signer.SetSignData(signSource).SetSignTextPrefix("TestPrefix");

    //签名主体设置后缀
    signer.SetSignData(signSource).SetSignTextSuffix("TestSuffix");

    //签名主体进行Base64
    signer.SetSignData(signSource).SetSignTextBase64();

    //签名主体进行MD5,(方法参数为签名结果是否转小写)
    signer.SetSignData(signSource).SetSignTextMD5(bool isToLower = true);

    //签名主体进行SHA1,(方法参数为签名结果是否转小写)
    signer.SetSignData(signSource).SetSignTextSHA1(bool isToLower = true);

    //获取签名结果
    string signString = signer.SetSignData(signSource).GetSignResult();

    //组合调用
    string signString = signer.SetSignData(signSource).SetSignTextBase64().SetSignTextMD5().SetSignTextSHA1();

4、代码实现

HttpSignItem类

用于保存签名的参数集合。

namespace JiuLing.CommonLibs.Security.HttpSign
{
    internal class HttpSignItem
    {
        public string Key { get; set; }
        public string Value { get; set; }

        public HttpSignItem(string key, string value)
        {
            Key = key;
            Value = value;
        }
    }
}

HttpSignSetting类

用于签名的基本配置。

using System.Text;

namespace JiuLing.CommonLibs.Security.HttpSign
{
    /// <summary>
    /// 签名配置
    /// </summary>
    public class HttpSignSetting
    {
        /// <summary>
        /// 是否按参数名进行排序
        /// </summary>
        public bool IsOrderByWithKey { get; set; } = false;

        /// <summary>
        /// 是否对签名数据的参数值进行UrlEncode
        /// </summary>
        public bool IsDoUrlEncodeForSourceValue { get; set; } = false;

        /// <summary>
        /// 签名主体是否包含参数名
        /// </summary>
        public bool IsSignTextContainKey { get; set; } = true;

        /// <summary>
        /// 签名主体中参数和参数值的连接符（需要启用IsSignTextContainKey）
        /// </summary>
        public string SignTextKeyValueSeparator { get; set; } = "=";

        /// <summary>
        /// 签名主体中不同参数项的连接符
        /// </summary>
        public string SignTextItemSeparator { get; set; } = "&";

        /// <summary>
        /// 编码
        /// </summary>
        public Encoding DefaultEncoding { get; set; } = Encoding.UTF8;
    }
}

HttpSigner类

签名组件的具体实现。

using System;
using System.Collections.Generic;
using System.Linq;

namespace JiuLing.CommonLibs.Security.HttpSign
{
    /// <summary>
    /// 网络请求签名工具
    /// </summary>
    public class HttpSigner
    {
        /// <summary>
        /// 签名配置
        /// </summary>
        private readonly HttpSignSetting _setting = new HttpSignSetting();
        /// <summary>
        /// 最终的签名串
        /// </summary>
        private string _signString;

        /// <summary>
        /// 设置签名数据
        /// </summary>
        /// <param name="signSource">待签名的键值对</param>
        /// <param name="setting">配置签名规则</param>
        /// <returns></returns>
        /// <exception cref="ArgumentException"></exception>
        public HttpSigner SetSignData(Dictionary<string, string> signSource, Action<HttpSignSetting> setting = null)
        {
            setting?.Invoke(_setting);
            if (_setting == null)
            {
                throw new ArgumentNullException("无效的签名配置", "setting");
            }

            if (signSource == null || signSource.Count == 0)
            {
                throw new ArgumentException("待签名数据异常", nameof(signSource));
            }

            var signSourceList = new List<HttpSignItem>(signSource.Count);
            foreach (var item in signSource)
            {
                var itemValue = item.Value;
                if (_setting.IsDoUrlEncodeForSourceValue)
                {
                    itemValue = System.Web.HttpUtility.UrlEncode(itemValue, _setting.DefaultEncoding);
                }
                signSourceList.Add(new HttpSignItem(item.Key, itemValue));
            }

            if (_setting.IsOrderByWithKey)
            {
                signSourceList = signSourceList.OrderBy(x => x.Key).ToList();
            }

            if (_setting.IsSignTextContainKey)
            {
                _signString = string.Join(_setting.SignTextItemSeparator, signSourceList.Select(x => $"{x.Key}{_setting.SignTextKeyValueSeparator}{x.Value}"));
            }
            else
            {
                _signString = string.Join(_setting.SignTextItemSeparator, signSourceList.Select(x => x.Value));
            }

            return this;
        }

        /// <summary>
        /// 签名主体设置前缀
        /// </summary>
        /// <param name="input">前缀值</param>
        /// <returns></returns>
        public HttpSigner SetSignTextPrefix(string input)
        {
            _signString = $"{input}{_signString}";
            return this;
        }

        /// <summary>
        /// 签名主体设置后缀
        /// </summary>
        /// <param name="input">后缀值</param>
        /// <returns></returns>
        public HttpSigner SetSignTextSuffix(string input)
        {
            _signString = $"{_signString}{input}";
            return this;
        }

        /// <summary>
        /// 签名主体设置后缀
        /// </summary>
        /// <returns></returns>
        public HttpSigner SetUrlEncode()
        {
            _signString = System.Web.HttpUtility.UrlEncode(_signString, _setting.DefaultEncoding);
            return this;
        }

        /// <summary>
        /// 签名主体进行Base64
        /// </summary>
        /// <returns></returns>
        public HttpSigner SetSignTextBase64()
        {
            _signString = Base64Utils.GetStringValue(_signString);
            return this;
        }

        /// <summary>
        /// 签名主体进行MD5
        /// </summary>
        /// <param name="isToLower">签名结果是否转小写</param>
        /// <returns></returns>
        public HttpSigner SetSignTextMD5(bool isToLower = true)
        {
            if (isToLower)
            {
                _signString = MD5Utils.GetStringValueToLower(_signString);
            }
            else
            {
                _signString = MD5Utils.GetStringValueToUpper(_signString);
            }
            return this;
        }

        /// <summary>
        /// 签名主体进行SHA1
        /// </summary>
        /// <param name="isToLower">签名结果是否转小写</param>
        /// <returns></returns>
        public HttpSigner SetSignTextSHA1(bool isToLower = true)
        {
            if (isToLower)
            {
                _signString = SHA1Utils.GetStringValueToLower(_signString);
            }
            else
            {
                _signString = SHA1Utils.GetStringValueToUpper(_signString);
            }
            return this;
        }

        /// <summary>
        /// 获取签名结果
        /// </summary>
        /// <returns></returns>
        public string GetSignResult()
        {
            return _signString;
        }
    }
}

5、附上仓库地址

以上代码包含在我的通用类库中，可以直接Nuget搜索JiuLing.CommonLibs安装。
GitHub类库地址
文章代码地址