346 lines
11 KiB
C#
346 lines
11 KiB
C#
using Newtonsoft.Json;
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using System.Collections.Generic;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Web;
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using System.Xml;
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namespace WX.CRM.Common.WxPay
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{
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/// <summary>
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/// 微信支付协议接口数据类，所有的API接口通信都依赖这个数据结构，
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/// 在调用接口之前先填充各个字段的值，然后进行接口通信，
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/// 这样设计的好处是可扩展性强，用户可随意对协议进行更改而不用重新设计数据结构，
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/// 还可以随意组合出不同的协议数据包，不用为每个协议设计一个数据包结构
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/// </summary>
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public class WxPayData
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{
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public const string SIGN_TYPE_MD5 = "MD5";
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public const string SIGN_TYPE_HMAC_SHA256 = "HMAC-SHA256";
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public WxPayData()
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{
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}
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//采用排序的Dictionary的好处是方便对数据包进行签名，不用再签名之前再做一次排序
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private SortedDictionary<string, object> m_values = new SortedDictionary<string, object>();
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/**
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* 设置某个字段的值
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* @param key 字段名
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* @param value 字段值
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*/
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public void SetValue(string key, object value)
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{
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m_values[key] = value;
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}
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/**
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* 根据字段名获取某个字段的值
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* @param key 字段名
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* @return key对应的字段值
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*/
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public object GetValue(string key)
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{
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object o = null;
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m_values.TryGetValue(key, out o);
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return o;
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}
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/**
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* 判断某个字段是否已设置
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* @param key 字段名
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* @return 若字段key已被设置，则返回true，否则返回false
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*/
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public bool IsSet(string key)
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{
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object o = null;
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m_values.TryGetValue(key, out o);
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if (null != o)
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return true;
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else
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return false;
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}
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/**
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* @将Dictionary转成xml
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* @return 经转换得到的xml串
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* @throws WxPayException
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**/
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public string ToXml()
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{
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//数据为空时不能转化为xml格式
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if (0 == m_values.Count)
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{
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Log.Error(this.GetType().ToString(), "WxPayData数据为空!");
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throw new WxPayException("WxPayData数据为空!");
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}
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string xml = "<xml>";
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foreach (KeyValuePair<string, object> pair in m_values)
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{
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//字段值不能为null，会影响后续流程
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if (pair.Value == null)
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{
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Log.Error(this.GetType().ToString(), "WxPayData内部含有值为null的字段!");
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throw new WxPayException("WxPayData内部含有值为null的字段!");
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}
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if (pair.Value.GetType() == typeof(int))
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{
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xml += "<" + pair.Key + ">" + pair.Value + "</" + pair.Key + ">";
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}
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else if (pair.Value.GetType() == typeof(double))
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{
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xml += "<" + pair.Key + ">" + pair.Value + "</" + pair.Key + ">";
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}
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else if (pair.Value.GetType() == typeof(string))
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{
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xml += "<" + pair.Key + ">" + "<![CDATA[" + pair.Value + "]]></" + pair.Key + ">";
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}
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else//除了string和int类型不能含有其他数据类型
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{
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Log.Error(this.GetType().ToString(), "WxPayData字段数据类型错误!");
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throw new WxPayException("WxPayData字段数据类型错误!");
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}
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}
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xml += "</xml>";
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return xml;
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}
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/**
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* @将xml转为WxPayData对象并返回对象内部的数据
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* @param string 待转换的xml串
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* @return 经转换得到的Dictionary
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* @throws WxPayException
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*/
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public SortedDictionary<string, object> FromXml(string xml, string mchId)
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{
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if (string.IsNullOrEmpty(xml))
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{
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Log.Error(this.GetType().ToString(), "将空的xml串转换为WxPayData不合法!");
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throw new WxPayException("将空的xml串转换为WxPayData不合法!");
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}
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SafeXmlDocument xmlDoc = new SafeXmlDocument();
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xmlDoc.LoadXml(xml);
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XmlNode xmlNode = xmlDoc.FirstChild;//获取到根节点<xml>
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XmlNodeList nodes = xmlNode.ChildNodes;
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foreach (XmlNode xn in nodes)
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{
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XmlElement xe = (XmlElement)xn;
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m_values[xe.Name] = xe.InnerText;//获取xml的键值对到WxPayData内部的数据中
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}
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try
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{
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//2015-06-29 错误是没有签名
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if (m_values["return_code"] != "SUCCESS")
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{
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return m_values;
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}
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if (string.IsNullOrEmpty(mchId) && m_values["mch_id"] != null)
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{
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mchId = m_values["mch_id"].ToString();
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}
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CheckSign(mchId);//验证签名,不通过会抛异常
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}
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catch (WxPayException ex)
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{
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throw new WxPayException(ex.Message);
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}
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return m_values;
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}
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/**
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* @Dictionary格式转化成url参数格式
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* @ return url格式串, 该串不包含sign字段值
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*/
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public string ToUrl()
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{
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string buff = "";
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foreach (KeyValuePair<string, object> pair in m_values)
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{
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if (pair.Value == null)
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{
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Log.Error(this.GetType().ToString(), "WxPayData内部含有值为null的字段!");
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throw new WxPayException("WxPayData内部含有值为null的字段!");
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}
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if (pair.Key != "sign" && pair.Value.ToString() != "")
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{
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buff += pair.Key + "=" + pair.Value + "&";
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}
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}
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buff = buff.Trim('&');
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return buff;
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}
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/**
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* @Dictionary格式化成Json
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* @return json串数据
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*/
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public string ToJson()
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{
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string jsonStr = JsonConvert.SerializeObject(m_values, Newtonsoft.Json.Formatting.None, DefaultJsonSerializerSettings);
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return jsonStr;
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}
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private readonly JsonSerializerSettings DefaultJsonSerializerSettings = new JsonSerializerSettings
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{
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DateFormatHandling = DateFormatHandling.IsoDateFormat,
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DateFormatString = "yyyy-MM-dd HH:mm:ss",
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DateTimeZoneHandling = DateTimeZoneHandling.Local,
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ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
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};
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/**
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* @values格式化成能在Web页面上显示的结果（因为web页面上不能直接输出xml格式的字符串）
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*/
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public string ToPrintStr()
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{
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string str = "";
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foreach (KeyValuePair<string, object> pair in m_values)
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{
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if (pair.Value == null)
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{
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Log.Error(this.GetType().ToString(), "WxPayData内部含有值为null的字段!");
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throw new WxPayException("WxPayData内部含有值为null的字段!");
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}
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str += string.Format("{0}={1}\n", pair.Key, pair.Value.ToString());
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}
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str = HttpUtility.HtmlEncode(str);
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Log.Debug(this.GetType().ToString(), "Print in Web Page : " + str);
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return str;
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}
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/**
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* @生成签名，详见签名生成算法
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* @return 签名, sign字段不参加签名
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*/
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public string MakeSign(string signType, string mchId)
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{
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//转url格式
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string str = ToUrl();
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//在string后加入API KEY
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str += "&key=" + Config.GetConfig().GetKey(mchId);
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if (signType == SIGN_TYPE_MD5)
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{
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var md5 = MD5.Create();
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var bs = md5.ComputeHash(Encoding.UTF8.GetBytes(str));
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var sb = new StringBuilder();
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foreach (byte b in bs)
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{
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sb.Append(b.ToString("x2"));
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}
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//所有字符转为大写
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return sb.ToString().ToUpper();
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}
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else if (signType == SIGN_TYPE_HMAC_SHA256)
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{
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return CalcHMACSHA256Hash(str, Config.GetConfig().GetKey(mchId));
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}
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else
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{
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throw new WxPayException("sign_type 不合法");
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}
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}
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/**
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* @生成签名，详见签名生成算法
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* @return 签名, sign字段不参加签名 SHA256
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*/
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public string MakeSign(string mchId)
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{
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return MakeSign(SIGN_TYPE_HMAC_SHA256, mchId);
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}
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/**
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*
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* 检测签名是否正确
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* 正确返回true，错误抛异常
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*/
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public bool CheckSign(string signType, string mchId)
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{
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//如果没有设置签名，则跳过检测
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if (!IsSet("sign"))
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{
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Log.Error(this.GetType().ToString(), "WxPayData签名存在但不合法!");
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throw new WxPayException("WxPayData签名存在但不合法!");
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}
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//如果设置了签名但是签名为空，则抛异常
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else if (GetValue("sign") == null || GetValue("sign").ToString() == "")
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{
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Log.Error(this.GetType().ToString(), "WxPayData签名存在但不合法!");
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throw new WxPayException("WxPayData签名存在但不合法!");
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}
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//获取接收到的签名
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string return_sign = GetValue("sign").ToString();
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//在本地计算新的签名
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string cal_sign = MakeSign(signType, mchId);
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if (cal_sign == return_sign)
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{
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return true;
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}
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Log.Error(this.GetType().ToString(), "WxPayData签名验证错误!");
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throw new WxPayException("WxPayData签名验证错误!");
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}
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/**
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*
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* 检测签名是否正确
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* 正确返回true，错误抛异常
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*/
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public bool CheckSign(string mchId)
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{
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return CheckSign(SIGN_TYPE_HMAC_SHA256, mchId);
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}
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/**
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* @获取Dictionary
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*/
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public SortedDictionary<string, object> GetValues()
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{
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return m_values;
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}
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private string CalcHMACSHA256Hash(string plaintext, string salt)
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{
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string result = "";
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var enc = Encoding.UTF8;
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byte[]
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baText2BeHashed = enc.GetBytes(plaintext),
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baSalt = enc.GetBytes(salt);
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System.Security.Cryptography.HMACSHA256 hasher = new HMACSHA256(baSalt);
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byte[] baHashedText = hasher.ComputeHash(baText2BeHashed);
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result = string.Join("", baHashedText.ToList().Select(b => b.ToString("x2")).ToArray());
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return result;
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}
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}
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} |