public override async Task Run()
{
try
{
if (!StoryBoard.TryLoadFromSession(SynchronizationStorySessionKey.CloudStorageCredentials, out SerializeableCloudStorageCredentials credentials))
{
throw new ArgumentNullException(nameof(credentials));
}
if (!StoryBoard.TryLoadFromSession(SynchronizationStorySessionKey.OauthState, out string oauthState))
{
throw new ArgumentNullException(nameof(oauthState));
}
if (!StoryBoard.TryLoadFromSession(SynchronizationStorySessionKey.OauthCodeVerifier, out string oauthCodeVerifier))
{
throw new ArgumentNullException(nameof(oauthState));
}
if (!StoryBoard.TryLoadFromSession(SynchronizationStorySessionKey.OauthRedirectUrl, out string redirectUrl))
{
throw new ArgumentNullException(nameof(redirectUrl));
}
StoryBoard.RemoveFromSession(SynchronizationStorySessionKey.OauthState);
StoryBoard.RemoveFromSession(SynchronizationStorySessionKey.OauthCodeVerifier);
StoryBoard.RemoveFromSession(SynchronizationStorySessionKey.OauthRedirectUrl);
ICloudStorageClient cloudStorageClient = _cloudStorageClientFactory.GetOrCreate(credentials.CloudStorageId);
if (cloudStorageClient is IOAuth2CloudStorageClient oauthStorageClient)
{
CloudStorageToken token = await oauthStorageClient.FetchTokenAsync(redirectUrl, oauthState, oauthCodeVerifier);
if (token != null)
{
// User has granted access.
credentials.Token = token;
await StoryBoard.ContinueWith(SynchronizationStoryStepId.ExistsCloudRepository);
}
else
{
// User has rejected access.
_feedbackService.ShowToast(_languageService.LoadText("sync_reject"));
await StoryBoard.ContinueWith(SynchronizationStoryStepId.StopAndShowRepository);
}
}
}
catch (Exception ex)
{
// Keep the current page open and show the error message
ShowExceptionMessage(ex, _feedbackService, _languageService);
}
}
