网站搜索框使用微信扫码功能(2)

public class HomeController : Controller
{
  //把APPID和APP_SECRET换成你自己的
  private const string APPID = "******";
  private const string APP_SECRET = "******";
  //为了调试方便我这里第一次把Token和Ticket获取到之后就写死了，应该写入缓存（7200s过期）
  private static string Token = "24_cQsz9scwyXLnPaAes5JlfHTfuQ2e3Iw5L8JyWfUpQiMnTk4IToOTZ7dP0Fv190ZHTy5ST--jeuDzYwoUj_hvhSHDX288YYLYVcrmvMzRPwld8ccTTzWGNTKZz53jYKDy5f8U1E886msDPsrwORGbAJABET";
  private static string Ticket = "HoagFKDcsGMVCIY2vOjf9qZA_fkPP3enjnT58qu16hzZN-3kwAP0NK6jgQM0jyAc0sK8cxaGkT9_DSgp6cHCpw";
  public ActionResult Index()
  {

    return View();
  }

  public ActionResult About()
  {
    ViewBag.Message = "Your application description page.";

    return View();
  }

  public ActionResult Contact()
  {
    ViewBag.Message = "Your contact page.";

    return View();
  }


  public async Task GetToken()
  {
    await GetTicketAsync();
  }
  //获取token和ticket
  private async Task<string> GetTicketAsync()
  {

    var tokenUrl = $"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={APPID}&secret={APP_SECRET}";

    var client = new System.Net.WebClient();
    client.Encoding = Encoding.UTF8;
    client.Headers.Add("Content-Type", "Application/x-www-form-urlencoded");
    var responseData = client.UploadData(tokenUrl, "POST", new byte[0]);
    var responseText = Encoding.UTF8.GetString(responseData);
    var token = JsonConvert.DeserializeAnonymousType(responseText, new { access_token = "", expires_in = "" });


    Token = token.access_token;
    var ticketUrl = $"https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token={Token}&type=jsapi";
    var ticResponseData = client.UploadData(ticketUrl, "POST", new byte[0]);
    var ticResponseText = Encoding.UTF8.GetString(ticResponseData);
    var ticket = JsonConvert.DeserializeAnonymousType(ticResponseText, new { errcode = "", errmsg = "", ticket = "", expires_in = "" });
    Ticket = ticket.ticket;
    return "";
  }
  //获取签名字符串
  public async Task<string> GetSingDataAsync(string url)
  {

    var sign = new SignData();
    sign.appId = APPID;
    sign.nonceStr = Create_nonce_str();
    sign.timestamp = Create_timestamp();
    //var url = Request.Url.AbsoluteUri;
    if (url.IndexOf('#') > 0)
    {
      url = url.Substring(0, url.IndexOf('#'));
    }
    sign.url = url;
    var string1 = "jsapi_ticket=" + Ticket +
        "&noncestr=" + sign.nonceStr +
        "×tamp=" + sign.timestamp +
        "&url=" + sign.url;

    //var string1 = GetTestSign();

    var sha1 = SHA1.Create();
    sign.signature = ByteToHex(sha1.ComputeHash(Encoding.UTF8.GetBytes(string1)));
    return JsonConvert.SerializeObject(sign);
  }
  //测试签名字符串，和微信官方提供的一样，用来测试签名方法是否正确
  private string GetTestSign()
  {
    var nonceStr = "Wm3WZYTPz0wzccnW";
    var ticket = "sM4AOVdWfPE4DxkXGEs8VMCPGGVi4C3VM0P37wVUCFvkVAy_90u5h9nbSlYy3-Sl-HhTdfl2fzFy1AOcHKP7qg";
    var timestamp = "1414587457";
    var url = "http://mp.weixin.qq.com?params=value";
    var string1 = "jsapi_ticket=" + ticket +
        "&noncestr=" + nonceStr +
        "×tamp=" + timestamp +
        "&url=" + url;
    return string1;
  }

  /// <summary>
  /// 随机字符串
  /// </summary>
  /// <returns></returns>
  private string Create_nonce_str()
  {
    return Guid.NewGuid().ToString().Substring(0, 8);
  }
  /// <summary>
  /// 时间戳
  /// </summary>
  /// <returns></returns>
  private string Create_timestamp()
  {
    return (DateTime.Now.Ticks / 100000000).ToString();
  }
  private string ByteToHex(byte[] hash)
  {
    var sb = new StringBuilder();
    foreach (var b in hash)
    {
      sb.Append(b.ToString("x2"));
    }
    return sb.ToString();
  }
}