private async Task <WechatAccessToken> GetOrRefreshToken()
{
if (_accessToken != null)
{
var age = DateTime.UtcNow - _accessToken.IssueTime;
if (age.TotalSeconds < _accessToken.ExpiresIn)
{
return(_accessToken);
}
}
using (var client = new HttpClient())
{
var uriBuilder = new UriBuilder(_options.TokenURI);
uriBuilder.Query = $"grant_type=client_credential&appid={_options.AppId}&secret={_options.AppSecret}";
var response = await client.GetAsync(uriBuilder.Uri);
response.EnsureSuccessStatusCode();
var json = await response.Content.ReadAsStringAsync();
_accessToken = JsonConvert.DeserializeObject <WechatAccessToken>(json);
_accessToken.IssueTime = DateTime.UtcNow;
return(_accessToken);
}
}
public static string RefrenshToken(string appid, string appsecret)
{
string userAgent = System.Web.HttpContext.Current.Request.UserAgent;
string url = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appid, appsecret);
HttpWebResponse res = HttpWebResponseUtility.CreateGetHttpResponse(url, null, userAgent, null);
Stream stream = res.GetResponseStream();
StreamReader sr = new StreamReader(stream);
string result = sr.ReadToEnd();
WechatAccessToken token = new WechatAccessToken();
token = JsonConvert.DeserializeObject <WechatAccessToken>(result);
string access_token = token.access_token;
if (string.IsNullOrEmpty(token.access_token))
{
WechatError err = new WechatError();
err = JsonConvert.DeserializeObject <WechatError>(result);
access_token = "appid或者appsecret错误，无法获取access_token 微信错误代码：" + err.errcode + "微信错误信息：" + err.errmsg;
LogHelper.Error(access_token);
}
else
{
AccessTokenService.WriteToken(token.access_token, System.DateTime.Now.AddMinutes(115).ToString("yyyy-MM-dd HH:mm:ss"));
}
return(access_token);
}
