async void CheckAuthAndRefresh()
{
//this is how we refresh the list items, once we know we're authenticated
Action refreshList = async() => {
//fetch gist
listFetchingActivity.IsRunning = true;
listFetchingActivity.IsVisible = true;
try
{
var links = await UserLinksDataStore.GetLinks();
urlView.ItemsSource = links;
}
catch (KeyNotFoundException ex) {
DisplayAlert("You haven't made any links yet", "Please make sure you create a GitHub gist called 'AppyLinks' and create links in the format Title [New Line] Url [New Line]. Leave an empty line between links.", "I'll go do that!", null);
}
catch (Exception ex) {
DisplayAlert("Error", "Unkown error. Message: " + ex.Message, "OK", null);
}
listFetchingActivity.IsRunning = false;
listFetchingActivity.IsVisible = false;
};
//if not authenticated, display authentication overlay first
var isAuthenticated = await UserLinksDataStore.IsAuthenticated();
if (!isAuthenticated)
{
Navigation.PushModalAsync(new AuthorizationView(() => {
Navigation.PopModalAsync();
refreshList();
}));
}
else
{
refreshList();
}
}
public AuthorizationView(Action authorizationComplete)
{
InitializeComponent();
//could not get the XAML <FileImageSource /> working correctly, so falling back to this pattern
Logo.Source = ImageSource.FromFile("Images/appylinkslogo.png");
//setup behaviour for authentication via github
GithubLoginUserAction.Clicked += async(sender, e) => {
//show that we are waiting for authorization to happen
AuthenticationInProgressIndicator.IsVisible = true;
AuthenticationInProgressIndicator.IsRunning = true;
//prevent user submitting again until we're finished
GithubLoginUserAction.IsEnabled = false;
//TODO: username and password inputs and message about how credentials won't be stored
try {
await UserLinksDataStore.Authorize(GithubUsername.Text, GithubPassword.Text);
DisplayAlert("Github Authentication", "Sucessfully logged in via github. To revoke access please visit your account settings page on GitHub.com", "OK", null);
//notify our owner of completion and let it decide what to do (probably hide this view)
if (authorizationComplete != null)
{
authorizationComplete();
}
} catch (Exception ex) {
DisplayAlert("Error", "There was a problem authenticating with github: " + ex.Message, "Dismiss", null);
//allow user to try again
//show that we are no longer waiting for authorization to happen
AuthenticationInProgressIndicator.IsVisible = false;
AuthenticationInProgressIndicator.IsRunning = false;
//allow user to submit again
GithubLoginUserAction.IsEnabled = true;
}
};
}