/// <summary>
/// 尝试从JSON字符串解析AccessToken
/// </summary>
/// <param name="json">JSON字符串</param>
/// <param name="msg">如果解析成功，返回AccessToken；否则，返回null。</param>
/// <returns>返回是否解析成功</returns>
internal static bool TryParse(string json, out OAuthAccessToken token)
{
bool success = false;
token = null;
try
{
token = Parse(json);
success = true;
}
catch { }
return(success);
}
/// <summary>
/// 刷新access token
/// </summary>
/// <param name="userName">公众号</param>
/// <param name="refreshToken">用户刷新token</param>
/// <param name="errorMessage">返回获取是否成功</param>
/// <returns>返回access token；如果获取失败，返回null。</returns>
public static OAuthAccessToken Refresh(string userName, string refreshToken, out ErrorMessage errorMessage)
{
OAuthAccessToken token = null;
if (string.IsNullOrWhiteSpace(refreshToken))
{
errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "用户刷新token不能为空。");
return(token);
}
AccountInfo account = AccountInfoCollection.GetAccountInfo(userName);
if (account == null)
{
errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "获取公众号信息失败。");
return(token);
}
string url = string.Format(urlForRefreshingAccessToken, account.AppId, refreshToken);
string responseContent;
if (!HttpHelper.Request(url, out responseContent, httpMethod, (string)null))
{
errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "从微信服务器获取响应失败。");
}
else if (ErrorMessage.IsErrorMessage(responseContent))
{
errorMessage = ErrorMessage.Parse(responseContent);
}
else
{
var result = JsonConvert.DeserializeAnonymousType(responseContent,
new { access_token = "", expires_in = 0, refresh_token = "", openid = "", scope = "" });
token = new OAuthAccessToken(result.access_token, result.expires_in, result.refresh_token, result.openid, result.scope);
errorMessage = new ErrorMessage(ErrorMessage.SuccessCode, "获取access token成功。");
}
return(token);
}