/// <summary>
/// 核心执行方法
/// </summary>
/// <param name="appId"></param>
/// <param name="recMsgXml">传入消息的xml</param>
/// <returns></returns>
protected virtual async Task <Resp <WechatChatContext> > Processing(string appId, string recMsgXml)
{
var recMsgDirs = WechatChatHelper.ChangXmlToDir(recMsgXml);
recMsgDirs.TryGetValue("MsgType", out var msgType);
string eventName = null;
if (msgType == "event")
{
if (!recMsgDirs.TryGetValue("Event", out eventName))
{
return(new Resp <WechatChatContext>().WithResp(RespTypes.ParaError, "事件消息数据中未发现 事件类型（Event）字段！"));
}
}
var processor = GetInternalMsgProcessor(msgType, eventName)
?? GetCustomProcessor(msgType, eventName, recMsgDirs)
?? SingleInstance <InternalWechatChatProcessor> .Instance;
var context = await ExecuteProcessor(appId, recMsgXml, recMsgDirs, processor);
await ProcessEnd(context);
return(new Resp <WechatChatContext>(context));
}
/// <summary>
/// 服务器接入验证
/// </summary>
/// <returns></returns>
public static StrResp CheckServerValid(WechatMsgConfig appConfig, WechatRequestPara reqBody)
{
var checkSignRes =
WechatChatHelper.CheckSignature(appConfig.Token, reqBody.signature, reqBody.timestamp, reqBody.nonce, string.Empty);
var resultRes = new StrResp().WithResp(checkSignRes);
resultRes.data = resultRes.IsSuccess() ? reqBody.echostr : string.Empty;
return(resultRes);
}
/// <summary>
/// 消息处理入口
/// </summary>
/// <param name="appConfig"></param>
/// <param name="reqBody">请求参数信息</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 async Task <StrResp> Process(WechatMsgConfig appConfig, WechatRequestPara reqBody)
{
if (string.IsNullOrEmpty(reqBody.signature) || string.IsNullOrEmpty(reqBody.timestamp) ||
string.IsNullOrEmpty(reqBody.nonce) || appConfig == null)
{
return(new StrResp().WithResp(RespTypes.ParaError, "消息相关参数错误！"));
}
// 一. 检查是否是微信服务端首次地址Get请求验证
if (!string.IsNullOrEmpty(reqBody.echostr))
{
return(CheckServerValid(appConfig, reqBody));
}
if (string.IsNullOrEmpty(reqBody.body))
{
return(new StrResp().WithResp(RespTypes.ParaError, "消息相关参数错误！"));
}
var checkRes = Prepare(appConfig, reqBody);
if (!checkRes.IsSuccess())
{
return(new StrResp().WithResp(checkRes));
}
var contextRes = await Processing(appConfig.AppId, checkRes.data);
if (!contextRes.IsSuccess())
{
return(new StrResp().WithResp(contextRes));
}
var resultString = contextRes.data.ReplyMsg.ToReplyXml();
if (appConfig.SecurityType != WechatSecurityType.None &&
!string.IsNullOrEmpty(contextRes.data.ReplyMsg.MsgType))
{
return(WechatChatHelper.EncryptMsg(resultString, appConfig));
}
return(new StrResp(resultString));
}
/// <summary>
/// 核心执行 过程的 验签和解密
/// </summary>
/// <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 static StrResp Prepare(WechatMsgConfig appConfig, WechatRequestPara reqBody)
{
var isEncryptMsg = appConfig.SecurityType == WechatSecurityType.Safe;
if (!isEncryptMsg)
{
var resCheck =
WechatChatHelper.CheckSignature(appConfig.Token, reqBody.signature, reqBody.timestamp, reqBody.nonce, string.Empty);
return(!resCheck.IsSuccess() ? new StrResp().WithResp(resCheck) : new StrResp(reqBody.body));
}
if (string.IsNullOrEmpty(reqBody.msg_signature))
{
return(new StrResp().WithResp(RespTypes.ParaError, "msg_signature 消息体验证签名参数为空！"));
}
var xmlDoc = WechatChatHelper.GetXmlDocment(reqBody.body);
var encryStr = xmlDoc?.FirstChild["Encrypt"]?.InnerText;
if (string.IsNullOrEmpty(encryStr))
{
return(new StrResp().WithResp(RespTypes.OperateObjectNull, "安全接口的加密字段为空！"));
}
var cryptMsgCheck =
WechatChatHelper.CheckSignature(appConfig.Token, reqBody.msg_signature, reqBody.timestamp, reqBody.nonce, encryStr);
if (!cryptMsgCheck.IsSuccess())
{
return(new StrResp().WithResp(cryptMsgCheck));
}
var recMsgXml = Cryptography.AESDecrypt(encryStr, appConfig.EncodingAesKey);
return(new StrResp(recMsgXml));
}
