/// <summary>
/// This method is used to prompt to login screen.
/// </summary>
/// <returns>True if sign in successfully, otherwise false</returns>
public async Task <bool> SignInAsync()
{
var success = false;
try
{
success = await GraphService.TryLoginAsync();
}
catch (Exception ex)
{
SignInFailed?.Invoke(this, new SignInFailedEventArgs(ex));
}
if (success)
{
AutomationProperties.SetName(this, string.Empty);
Flyout = GenerateMenuItems();
SignInCompleted?.Invoke(this, new SignInEventArgs()
{
GraphClient = GraphService.GraphProvider
});
return(true);
}
return(false);
}
/// <summary>
/// Tries to log in user if not already loged in
/// </summary>
/// <returns>true if service is already loged in</returns>
internal async Task <bool> TryLoginAsync()
{
if (!IsInitialized)
{
return(false);
}
if (IsAuthenticated)
{
return(true);
}
try
{
await _readLock.WaitAsync();
await LoginAsync();
}
catch (MsalServiceException ex)
{
// Swallow error in case of authentication cancellation.
if (ex.ErrorCode != "authentication_canceled" &&
ex.ErrorCode != "access_denied")
{
SignInFailed?.Invoke(this, new SignInFailedEventArgs(ex));
}
}
finally
{
_readLock.Release();
}
return(IsAuthenticated);
}
private async void AuthenticateUserAsync(int id)
{
Reader user = new Reader(id, "name", "name", passwordField.Text);
try
{
await RequestClient.Instance.PostItemAsync(user, "signin");
}
catch (BadHttpStatusCodeException ex)
{
if (ex.StatusCode == HttpStatusCode.NotFound)
{
SignInFailed.Invoke(this, new EventArgs());
return;
}
else
{
return;
}
}
signInAttempts = 0;
progressBar.Visibility = ViewStates.Invisible;
Intent intent = new Intent(this, typeof(TabbedPagesActivity));
this.StartActivity(intent);
}
private void LoginButton_Click(object sender, EventArgs e)
{
progressBar.Visibility = ViewStates.Visible;
if (signInAttempts >= 5)
{
SignInFailed += SignInFailed_Exit;
}
if (!int.TryParse(userIdField.Text, out int id))
{
SignInFailed.Invoke(this, new EventArgs());
return;
}
AuthenticateUserAsync(id);
}
internal async Task <bool> ConnectForAnotherUserAsync()
{
if (!IsInitialized)
{
throw new InvalidOperationException("Microsoft Graph not initialized.");
}
try
{
var publicClientApplication = new PublicClientApplication(AppClientId);
AuthenticationResult result = await publicClientApplication.AcquireTokenAsync(DelegatedPermissionScopes);
var signedUser = result.User;
foreach (var user in publicClientApplication.Users)
{
if (user.Identifier != signedUser.Identifier)
{
publicClientApplication.Remove(user);
}
}
await LoginAsync();
return(true);
}
catch (MsalServiceException ex)
{
// Swallow error in case of authentication cancellation.
if (ex.ErrorCode != "authentication_canceled" &&
ex.ErrorCode != "access_denied")
{
SignInFailed?.Invoke(this, new SignInFailedEventArgs(ex));
}
}
return(false);
}
private void GraphService_SignInFailed(object sender, Services.MicrosoftGraph.SignInFailedEventArgs e)
{
SignInFailed?.Invoke(sender, new SignInFailedEventArgs(e.Exception));
}
