/// <summary>
/// Refreshes the expired access token.
/// </summary>
/// <param name="httpClient">The <see cref="HttpClient"/> to perform the send operation.</param>
/// <returns>A task that represents the asynchronous refresh operation.</returns>
private static async Task <string> InternalRefreshToken(HttpClient httpClient)
{
// Prepare the refresh request
var endpoint = Uris.GetRefreshTokenUri();
var refreshRequest = new JsonObject
{
{ "grant_type", "refresh_token" },
{ "refresh_token", Settings.Instance.GetValue(Settings.RefreshToken, string.Empty) }
};
using (var request = new HttpRequestMessage(endpoint.Method, WebHelper.AppendNonce(endpoint.Uri)))
{
// Setup the request
request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
request.Content = refreshRequest.AsHttpContent();
// Send the request to the server
var socketTimeout = httpClient.Timeout.Add(TimeSpan.FromSeconds(5));
var response = await WebHelper.SendRequest(httpClient, request, socketTimeout);
using (response)
{
// Parse the server response
var responseContent = await WebHelper.ParseResponse(response);
// Parse the new access token data
var accessToken = responseContent.GetItemOrDefault("access_token").GetStringValueOrDefault(string.Empty);
var expiresIn = responseContent.GetItemOrDefault("expires_in").GetIntValueOrDefault(24 * 60 * 60);
// If all of the fields are returned
if (!string.IsNullOrEmpty(accessToken))
{
// Update access token
Settings.Instance.SetValue(Settings.AccessToken, accessToken);
Settings.Instance.SetValue(Settings.AccessTokenExpires, DateTime.UtcNow.AddSeconds(expiresIn));
return(accessToken);
}
// Report error
throw new RemoteServerException(
HttpStatusCode.Unauthorized,
Localization.ErrorDialogTitle,
Localization.ErrorUnauthorized,
null);
}
}
}
/// <summary>
/// Retries the login process after user consent to change session.
/// </summary>
/// <param name="request">The request to retry.</param>
/// <param name="response">The response received from the server.</param>
private async void RetryLogin(JsonObject request, JsonValue response)
{
// Ask the user consent to override session
var consent = await App.DisplayAlert(
Localization.ConfirmationDialogTitle,
Localization.ConfirmationSesionChange,
Localization.ButtonConfirm,
Localization.Cancel);
// If the user consent received
if (consent)
{
// Modify the request based on server response
var grantType = response.GetItemOrDefault("grant_type").GetStringValueOrDefault(string.Empty);
if (!string.IsNullOrEmpty(grantType))
{
request["grant_type"] = grantType;
}
var state = response.GetItemOrDefault("state").GetStringValueOrDefault(string.Empty);
if (!string.IsNullOrEmpty(state))
{
request["state"] = state;
}
// Resent the request to the server
request.Add("override", true);
WebHelper.SendAsync(
Uris.GetLoginUri(),
request.AsHttpContent(),
this.ProcessLoginResult,
() => this.IsBusy = false);
}
else
{
// Cancel the task
this.UserName = string.Empty;
this.Password = string.Empty;
this.OnPropertyChanged(nameof(this.Password));
this.IsBusy = false;
}
}