/// <summary>
/// Methode qui permet de rafraichir le Token depuis l'access Token
/// </summary>
/// <param name="refresh_token"></param>
/// <returns></returns>
public async Task<bool> RefreshToken(string refresh_token)
{
string postData = string.Format("client_id={0}&client_secret={1}&refresh_token={2}&grant_type=refresh_token", ClientID, ClientSecret, refresh_token);
StringContent content = new StringContent(postData, Encoding.UTF8, "application/x-www-form-urlencoded");
Stream result = await Post("https://accounts.google.com/o/oauth2/token", content, false);
if (result != null)
{
DataContractJsonSerializer deserializer = new DataContractJsonSerializer(typeof(Token));
AccessToken = (Token)deserializer.ReadObject(result);
AccessToken.RefreshToken = refresh_token;
FileManager.WriteFileAsync(FILE_NAME, CryptographicManager.Encrypt(AccessToken.RefreshToken, KEY));
return true;
}
return false;
}
/// <summary>
/// Methode qui supprime le token
/// </summary>
public async void CleanToken()
{
bool tok=false;
try
{
string encryptedText = await FileManager.ReadFile(FILE_NAME);
string decryptedText = CryptographicManager.Decrypt(encryptedText, KEY);
if (!String.IsNullOrEmpty(encryptedText))
tok = true;
}
catch (Exception)
{
}
if (tok)
{
FileManager.RemoveFileAsync(FILE_NAME);
AccessToken = null;
}
}
/// <summary>
/// Methode qui permet de récupérer un nouveau TOKEN
/// </summary>
/// <returns></returns>
public async Task<bool> LoadToken()
{
//Step 1. Create a Request and Callback Uri for the Authentication operation
Uri requestUri = new Uri(string.Format("{0}?scope={1}&redirect_uri={2}&response_type={3}&client_id={4}",googleUri, Scope, redirect_uri, response_type, ClientID), UriKind.RelativeOrAbsolute);
Uri callbackUri = new Uri(redirect_uri, UriKind.RelativeOrAbsolute);
//Step 2. Initialize a Authentication operation using WebAuthenticationBroker
WebAuthenticationResult webResult = await WebAuthenticationBroker.AuthenticateAsync(WebAuthenticationOptions.None,requestUri, callbackUri);
switch (webResult.ResponseStatus)
{
case WebAuthenticationStatus.ErrorHttp:
GoogleErrorOccured(webResult.ResponseData);
break;
case WebAuthenticationStatus.Success:
string code = webResult.ResponseData.Split(new string[] { "code=" }, StringSplitOptions.RemoveEmptyEntries)[1];
string postData = string.Format("client_id={0}&client_secret={1}&code={2}&redirect_uri={3}&grant_type=authorization_code", ClientID, ClientSecret, code, redirect_uri);
StringContent content = new StringContent(postData, Encoding.UTF8, "application/x-www-form-urlencoded");
Stream result = await Post("https://accounts.google.com/o/oauth2/token", content, false);
if (result != null)
{
DataContractJsonSerializer deserializer = new DataContractJsonSerializer(typeof(Token));
byte[] arrayMessage = new byte[result.Length];
result.Read(arrayMessage, 0, arrayMessage.Length);
var message = Encoding.UTF8.GetString(arrayMessage, 0, arrayMessage.Length);
System.Diagnostics.Debug.WriteLine(message);
result.Position = 0;
AccessToken = (Token)deserializer.ReadObject(result);
FileManager.WriteFileAsync(FILE_NAME, CryptographicManager.Encrypt(AccessToken.RefreshToken, KEY));
return true;
}
break;
case WebAuthenticationStatus.UserCancel:
//The User selected to cancel the Authentication process
break;
default:
break;
}
return false;
}
