/// <summary>
/// 核心执行 过程的 验签和解密
/// </summary>
/// <param name="recXml">消息内容</param>
/// <param name="signature">微信加密签名</param>
/// <param name="timestamp">时间戳</param>
/// <param name="nonce">随机数</param>
/// <returns>验证结果及相应的消息内容体 （如果加密模式，返回的是解密后的明文）</returns>
private ResultMo <string> PrepareExecute(string recXml, string signature,
string timestamp, string nonce)
{
if (string.IsNullOrEmpty(recXml))
{
return(new ResultMo <string>(ResultTypes.ObjectNull, "接收的消息体为空！"));
}
var resCheck = WxMsgHelper.CheckSignature(ApiConfig.Token, signature, timestamp, nonce);
if (!resCheck.IsSuccess())
{
return(resCheck.ConvertToResult <string>());
}
if (ApiConfig.SecurityType == WxSecurityType.None)
{
return(new ResultMo <string>(recXml));
}
var dirs = WxMsgHelper.ChangXmlToDir(recXml, out XmlDocument xmlDoc);
if (dirs == null || !dirs.TryGetValue("Encrypt", out var encryStr) ||
string.IsNullOrEmpty(encryStr))
{
return(new ResultMo <string>(ResultTypes.ObjectNull, "加密消息为空"));
}
var recMsgXml = Cryptography.WxAesDecrypt(encryStr, ApiConfig.EncodingAesKey);
return(new ResultMo <string>(recMsgXml));
}
/// <summary>
/// 消息处理入口
/// </summary>
/// <param name="contentXml">内容信息</param>
/// <param name="signature">签名信息</param>
/// <param name="timestamp">时间戳</param>
/// <param name="nonce">随机字符创</param>
/// <param name="echostr">验证服务器参数，如果存在则只进行签名验证，并将在结果data中返回</param>
/// <returns>消息结果，Data为响应微信数据，如果出错Message为错误信息</returns>
public ResultMo <string> Process(string contentXml, string signature, string timestamp, string nonce,
string echostr)
{
// 一. 检查是否是服务器验证
if (!string.IsNullOrEmpty(echostr))
{
return(CheckServerValid(signature, timestamp, nonce, echostr));
}
// 二. 正常消息处理
var checkRes = PrepareExecute(contentXml, signature, timestamp, nonce);
if (!checkRes.IsSuccess())
{
return(checkRes.ConvertToResult <string>());
}
var contextRes = Execute(checkRes.data);
if (!contextRes.IsSuccess())
{
return(contextRes.ConvertToResult <string>());
}
var resultString = contextRes.data.ReplyMsg.ToReplyXml();
if (ApiConfig.SecurityType != WxSecurityType.None &&
!string.IsNullOrEmpty(contextRes.data.ReplyMsg.MsgType))
{
return(WxMsgHelper.EncryptMsg(resultString, ApiConfig));
}
return(new ResultMo <string>(resultString));
}
/// <summary>
/// 核心执行方法 过程中的 委托方代码执行
/// </summary>
/// <param name="recMsgXml">传入消息的xml</param>
/// <returns></returns>
protected virtual ResultMo <WxMsgContext> Execute(string recMsgXml)
{
var recMsgDirs = WxMsgHelper.ChangXmlToDir(recMsgXml, out XmlDocument xmlDoc);
recMsgDirs.TryGetValue("MsgType", out var msgType);// recMsgDirs["MsgType"].ToLower();
string eventName = null;
if (msgType == "event")
{
if (!recMsgDirs.TryGetValue("Event", out eventName))
{
return(new ResultMo <WxMsgContext>(ResultTypes.ParaError, "事件消息数据中未发现 事件类型（Event）字段！"));
}
}
var processor = GetBasicMsgProcessor(msgType, eventName);
if (!(processor?.CanExecute).HasValue)
{
processor = GetCustomProcessor(msgType, eventName, recMsgDirs);
if (!(processor?.CanExecute).HasValue)
{
processor = GetRegProcessor(msgType, eventName);
}
}
var context = processor != null && processor.CanExecute
? ExecuteProcessor(xmlDoc, recMsgDirs, processor.CreateNewInstance(), processor.Execute)
: ExecuteProcessor(xmlDoc, recMsgDirs, new WxBaseRecMsg(), null);
ExecuteEnd(context);
return(new ResultMo <WxMsgContext>(context));
}
/// <summary>
/// 核心执行方法 == 执行方法
/// </summary>
/// <param name="recMsgXml">传入消息的xml</param>
protected ResultMo <MsgContext> ProcessExecute(string recMsgXml)
{
XmlDocument xmlDoc = null;
var recMsgDirs = WxMsgHelper.ChangXmlToDir(recMsgXml, ref xmlDoc);
if (!recMsgDirs.ContainsKey("MsgType"))
{
return(new ResultMo <MsgContext>(ResultTypes.ParaError, "消息数据中未发现 消息类型（MsgType）字段！"));
}
string msgType = recMsgDirs["MsgType"].ToLower();
if (msgType == "event")
{
if (!recMsgDirs.ContainsKey("Event"))
{
return(new ResultMo <MsgContext>(ResultTypes.ParaError, "事件消息数据中未发现 事件类型（Event）字段！"));
}
}
var context = ProcessExecute_BasicMsg(xmlDoc, msgType, recMsgDirs)
?? ProcessExecute_AdvancedMsg(xmlDoc, msgType, recMsgDirs)
?? ExecuteBasicMsgHandler(xmlDoc, recMsgDirs, UnknowHandler);
return(new ResultMo <MsgContext>(context));
}
/// <summary>
/// 核心执行方法 == 验证签名和消息体信息解密处理部分
/// </summary>
/// <param name="recXml">消息内容</param>
/// <param name="signature">微信加密签名</param>
/// <param name="timestamp">时间戳</param>
/// <param name="nonce">随机数</param>
/// <returns>验证结果及相应的消息内容体 （如果加密模式，返回的是解密后的明文）</returns>
protected ResultMo <string> ProcessBegin(string recXml, string signature,
string timestamp, string nonce)
{
if (string.IsNullOrEmpty(recXml))
{
return(new ResultMo <string>(ResultTypes.ObjectNull, "接收的消息体为空！"));
}
var resCheck = WxMsgHelper.CheckSignature(m_Config.Token, signature, timestamp, nonce);
if (resCheck.IsSuccess())
{
if (m_Config.SecurityType != WxSecurityType.None)
{
XmlDocument xmlDoc = null;
var dirs = WxMsgHelper.ChangXmlToDir(recXml, ref xmlDoc);
if (dirs == null || !dirs.ContainsKey("Encrypt"))
{
return(new ResultMo <string>(ResultTypes.ObjectNull, "加密消息为空"));
}
var recMsgXml = Cryptography.WxAesDecrypt(dirs["Encrypt"], m_Config.EncodingAesKey);
return(new ResultMo <string>(recMsgXml));
}
return(new ResultMo <string>(recXml));
}
return(resCheck.ConvertToResultOnly <string>());
}
/// <summary>
/// 服务器验证
/// </summary>
/// <param name="signature"></param>
/// <param name="timestamp"></param>
/// <param name="nonce"></param>
/// <param name="echostr"></param>
/// <returns></returns>
public ResultMo <string> CheckServerValid(string signature, string timestamp, string nonce, string echostr)
{
var checkSignRes = WxMsgHelper.CheckSignature(m_Config.Token, signature, timestamp, nonce);
var resultRes = checkSignRes.ConvertToResultOnly <string>();
resultRes.data = resultRes.IsSuccess() ? echostr : string.Empty;
return(resultRes);
}
/// <summary>
/// 根据具体的消息类型执行相关的消息委托方法(基础消息)
/// </summary>
/// <typeparam name="TRecMsg"></typeparam>
/// <param name="recMsgXml"></param>
/// <param name="recMsgDirs"></param>
/// <param name="func"></param>
/// <returns></returns>
private static MsgContext ExecuteBasicMsgHandler <TRecMsg>(XmlDocument recMsgXml,
IDictionary <string, string> recMsgDirs, Func <TRecMsg, BaseReplyMsg> func)
where TRecMsg : BaseRecMsg, new()
{
var msgContext = new MsgContext();
var recMsg = WxMsgHelper.GetMsg <TRecMsg>(recMsgDirs);
recMsg.RecMsgXml = recMsgXml;
msgContext.ReplyMsg = ExecuteHandler(recMsg, func);
msgContext.RecMsg = recMsg;
return(msgContext);
}