public async void GetPhotoStreamAsync(string userId, Dictionary<string, string> parameters = null)
{
string timestamp = DateTimeUtils.GetTimestamp();
string nonce = Guid.NewGuid().ToString().Replace("-", null);
Dictionary<string, string> paramDict = new Dictionary<string, string>();
paramDict["method"] = "flickr.people.getPhotos";
paramDict["format"] = "json";
paramDict["nojsoncallback"] = "1";
paramDict["oauth_consumer_key"] = consumerKey;
paramDict["oauth_nonce"] = nonce;
paramDict["oauth_signature_method"] = "HMAC-SHA1";
paramDict["oauth_timestamp"] = timestamp;
paramDict["oauth_token"] = AccessToken;
paramDict["oauth_version"] = "1.0";
if (parameters != null)
{
foreach (var entry in parameters)
{
paramDict[entry.Key] = entry.Value;
}
}
if (userId == Cinderella.Cinderella.CinderellaCore.CurrentUser.ResourceId)
paramDict["user_id"] = "me";
else
paramDict["user_id"] = UrlHelper.Encode(userId);
paramDict["extras"] = UrlHelper.Encode(commonExtraParameters);
User user = null;
if (Cinderella.Cinderella.CinderellaCore.UserCache.ContainsKey(userId))
{
user = Cinderella.Cinderella.CinderellaCore.UserCache[userId];
user.IsLoadingPhotoStream = true;
}
string paramString = GenerateParamString(paramDict);
string signature = GenerateSignature("GET", AccessTokenSecret, "https://api.flickr.com/services/rest", paramString);
string requestUrl = "https://api.flickr.com/services/rest?" + paramString + "&oauth_signature=" + signature;
HttpWebResponse response = await DispatchRequest("GET", requestUrl, null).ConfigureAwait(false);
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
GetPhotoStreamExceptionEventArgs exceptionEvt = null;
if (user != null)
{
user.IsLoadingPhotoStream = false;
}
if (response.StatusCode != HttpStatusCode.OK)
{
HandleHTTPException(response);
exceptionEvt = new GetPhotoStreamExceptionEventArgs();
exceptionEvt.UserId = userId;
PhotoStreamException(this, exceptionEvt);
return;
}
string jsonString = await reader.ReadToEndAsync().ConfigureAwait(false);
if (!TryHandleResponseException(jsonString, () => { GetPhotoStreamAsync(userId, parameters); }))
{
exceptionEvt = new GetPhotoStreamExceptionEventArgs();
exceptionEvt.UserId = userId;
PhotoStreamException(this, exceptionEvt);
return;
}
GetPhotoStreamEventArgs args = new GetPhotoStreamEventArgs();
args.UserId = userId;
args.Response = jsonString;
PhotoStreamReturned.DispatchEvent(this, args);
}
}
// Cannot load photo stream
private void OnPhotoStreamException(object sender, GetPhotoStreamExceptionEventArgs e)
{
Dispatcher.BeginInvoke(() =>
{
if (e.UserId != UserSource.ResourceId)
return;
if(SystemTray.ProgressIndicator != null)
SystemTray.ProgressIndicator.IsVisible = false;
StatusLabel.Text = AppResources.GenericPhotoLoadingErrorText;
StatusLabel.Visibility = Visibility.Visible;
PhotoStreamListView.Visibility = Visibility.Collapsed;
});
}
// Photo stream exception
private void OnPhotoStreamException(object sender, GetPhotoStreamExceptionEventArgs e)
{
Dispatcher.BeginInvoke(() => {
if (e.UserId != Cinderella.CinderellaCore.CurrentUser.ResourceId)
return;
if (Cinderella.CinderellaCore.CurrentUser.Photos.Count == 0)
{
StatusLabel.Text = "Cannot load your photo stream";
StatusLabel.Visibility = Visibility.Visible;
PhotoStreamListView.Visibility = Visibility.Collapsed;
}
});
}
