/// <summary>
/// 微信登录跳转。
/// </summary>
/// <param name="service">微信公众服务。</param>
/// <param name="controller">Mvc控制器。</param>
/// <param name="returnUrl">回调地址。</param>
/// <returns>返回跳转结果。</returns>
public static ActionResult SignIn(this PublicService service, Controller controller, string returnUrl)
{
var state = new Random().Next(100000000, 1000000000);
controller.Session["wechatState"] = state;
string url = service.GetAuthUrlWithInfo(returnUrl, state.ToString());
return(new RedirectResult(url));
}
/// <summary>
/// 处理微信被动消息。
/// </summary>
/// <param name="service">微信公众服务。</param>
/// <param name="controller">Mvc控制器。</param>
/// <returns>返回处理结果。</returns>
public static async Task <ActionResult> HandleMessage(this PublicService service, Controller controller)
{
IReplyMessage message;
if (controller.Request.QueryString.AllKeys.Contains("msg_signature"))
{
message = await service.HandleEncryptedMessage(controller.Request.InputStream, controller.Request.QueryString["timestamp"], controller.Request.QueryString["nonce"], controller.Request.QueryString["msg_signature"]);
}
else
{
message = await service.HandleMessage(controller.Request.InputStream);
}
if (message == null)
{
return new ContentResult()
{
Content = "success"
}
}
;
MemoryStream stream = new MemoryStream();
message.WriteResponseText(stream);
if (controller.Request.QueryString.AllKeys.Contains("msg_signature"))
{
var encryptedMessage = service.EncryptMessage(Encoding.UTF8.GetString(stream.ToArray()));
var timestamp = service.GetTimestamp().ToString();
var nonce = Guid.NewGuid().ToString().Replace("-", "");
List <string> data = new List <string> {
service.AppToken, timestamp, nonce, encryptedMessage
};
data.Sort();
string signature;
using (SHA1 sha = SHA1.Create())
{
signature = string.Concat(sha.ComputeHash(Encoding.ASCII.GetBytes(string.Concat(data))).SelectMany(t => t.ToString("x2")));
}
XmlDocument doc = new XmlDocument();
var xml = doc.CreateElement("xml");
var xmlEncrypt = doc.CreateElement("Encrypt");
xmlEncrypt.InnerText = encryptedMessage;
var xmlSignature = doc.CreateElement("MsgSignature");
xmlSignature.InnerText = signature;
var xmlTimeStamp = doc.CreateElement("TimeStamp");
xmlTimeStamp.InnerText = timestamp;
var xmlNonce = doc.CreateElement("Nonce");
xmlNonce.InnerText = nonce;
xml.AppendChild(xmlEncrypt);
xml.AppendChild(xmlSignature);
xml.AppendChild(xmlTimeStamp);
xml.AppendChild(xmlNonce);
stream.Position = 0;
doc.Save(stream);
}
stream.Position = 0;
return(new FileStreamResult(stream, "text/xml"));
}
}
