/// <summary>
/// 执行消息处理。
/// </summary>
private void ExecMessageHandler()
{
#region 参数校验
if (string.IsNullOrEmpty(this.MessageContext.HttpRequestContent))
{
throw new StringNullOrEmptyException("HttpRequestContent");
}
if (this.MessageContext.HttpRequestParams == null)
{
throw new StringNullOrEmptyException("HttpRequestParams");
}
#endregion
#region 初始化参数
this._requestParams = this.MessageContext.HttpRequestParams;
this._requestContent = this.MessageContext.HttpRequestContent;
#endregion
#region 校验签名
CheckSignature.Execute(this._requestParams.Signature, this._requestParams.Timestamp, this._requestParams.Nonce, string.Empty);
#endregion
#region 消息解密
if (this._requestParams.IsEncrypt)
{
this._msgCrypto = new WeixinMsgCrypto();
int decryptMsgResult = this._msgCrypto.DecryptMsg(this._requestParams.Msg_Signature, this._requestParams.Timestamp, this._requestParams.Nonce, this._requestContent, ref this._requestContent);
if (decryptMsgResult != Convert.ToInt32(WeixinMsgCryptoErrorCode.OK))
{
throw new Exception("消息解密失败！");
}
}
#endregion
//消息解析。
this._requestMessage = RequestMessageProcess.Parse(this._requestContent);
if (this._requestMessage == null)
{
this._responeContent = string.Empty;
//记录日志。
WeixinApp.Logger.Info($"消息未处理，requestContent:{this._requestContent}");
return;
}
#region 会话支持
//todo: 后期实现。
#endregion
#region 消息去重
#region 除无效的消息标识
for (int i = 0; i < _messageIdentitys.Count; i++)
{
KeyValuePair <string, DateTime> item = _messageIdentitys[i];
//如果消息处理时间大于 30 秒则删除该条标识。
if (item.Value.AddSeconds(30) < DateTime.Now)
{
_messageIdentitys.Remove(item);
}
}
#endregion
string msgIdentity = this.GetMessageIdentity(this._requestMessage);
//如果消息已经被标识为处理则返回空字符串，
if (_messageIdentitys.Any(i => i.Key == msgIdentity))
{
this._responeContent = string.Empty;
//记录日志。
WeixinApp.Logger.Info($"消息重复，已经响应空字符串消息,消息标识：[{msgIdentity}]\r\n请求内容：{_requestContent}");
return;
}
//将当前消息标识添加到标识列表中，
_messageIdentitys.Add(new KeyValuePair <string, DateTime>(msgIdentity, DateTime.Now));
#endregion
//消息处理。
this._responeContent = RequestMessageProcess.ProcessByConfig(this._requestContent);
#region 消息加密
if (this._requestParams.IsEncrypt)
{
int encryptMsgResult = this._msgCrypto.EncryptMsg(this._responeContent, this._requestParams.Timestamp, this._requestParams.Nonce, ref this._responeContent);
if (encryptMsgResult != Convert.ToInt32(WeixinMsgCryptoErrorCode.OK))
{
throw new Exception("消息加密失败！");
}
}
#endregion
}
