public static async Task <bool> RefreshAuthorizationTokenIfRequired()
{
long lastSetTime = ApplicationSetting.GetLocalSetting_Long("google_token_expiresTime", 0);
if (lastSetTime != 0)
{
long now = DateTime.Now.Ticks / TimeSpan.TicksPerSecond;
if (now > lastSetTime)
{
// expired
string FetchURL = "https://accounts.google.com/o/oauth2/token";
var handler = new HttpClientHandler();
var req = new HttpClient(handler);
Tuple <string, string> keypair = APIKeys.GetRandomizedClientSecretAndIDPair();
string pdata = string.Format("client_id={0}&client_secret={1}&refresh_token={2}&grant_type=refresh_token",
keypair.Item1,
keypair.Item2,
await ApplicationSetting.GetEncryptedLocalStringValueOrDefault("google_refresh_token", ""));
StringContent strc = new StringContent(pdata, Encoding.UTF8, "application/x-www-form-urlencoded");
try
{
HttpResponseMessage data = await req.PostAsync(FetchURL, strc);
HttpContent content = data.Content;
data.EnsureSuccessStatusCode();
// {"access_token":"1/fFAGRNJru1FTz70BzhT3Zg","expires_in":3920,"token_type":"Bearer"}
JObject token = JObject.Parse(await content.ReadAsStringAsync());
/* string access_token = (string) token["access_token"];
* string token_type = (string)token["token_type"];
* int expires_in = (int)token["expires_in"];
* string refresh_token = (string)token["refresh_token"];
*
* Debug.WriteLine(ReturnData);*/
await ApplicationSetting.SetUpdateLocalValueEncrypted("google_access_token", (string)token["access_token"]);
ApplicationSetting.SetLocalSetting("google_token_expiresTime", (long)now + (((long)token["expires_in"] - 5L) * 60L));
return(true);
}
catch (Exception eex)
{
Debug.WriteLine(eex.ToString());
}
return(false);
}
else
{
// not expired, do nothing.
}
}
return(true);
}
