public async void GetGroupListAsync(string userId, Dictionary<string, string> parameters = null)
{
if (groupListFetchingQueue.Contains(userId))
return;
groupListFetchingQueue.Add(userId);
string timestamp = DateTimeUtils.GetTimestamp();
string nonce = Guid.NewGuid().ToString().Replace("-", null);
Dictionary<string, string> paramDict = new Dictionary<string, string>();
paramDict["method"] = "flickr.people.getGroups";
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;
}
}
paramDict["user_id"] = UrlHelper.Encode(userId);
paramDict["extras"] = UrlHelper.Encode("privacy,throttle,restrictions");
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()))
{
if(groupListFetchingQueue.Contains(userId))
groupListFetchingQueue.Remove(userId);
GetGroupListExceptionEventArgs exceptionEvt = null;
if (response.StatusCode != HttpStatusCode.OK)
{
HandleHTTPException(response);
exceptionEvt = new GetGroupListExceptionEventArgs();
exceptionEvt.Message = "Unknown network error";
exceptionEvt.UserId = userId;
GetGroupListException.DispatchEvent(this, exceptionEvt);
return;
}
string jsonString = await reader.ReadToEndAsync().ConfigureAwait(false);
if (!TryHandleResponseException(jsonString, () => { GetGroupListAsync(userId, parameters); }))
{
exceptionEvt = new GetGroupListExceptionEventArgs();
exceptionEvt.Message = "Unknown network error";
exceptionEvt.UserId = userId;
GetGroupListException.DispatchEvent(this, exceptionEvt);
return;
}
GetGroupListEventArgs args = new GetGroupListEventArgs();
args.UserId = userId;
args.Response = jsonString;
GroupListReturned.DispatchEvent(this, args);
}
}
private void OnGetGroupListException(object sender, GetGroupListExceptionEventArgs e)
{
Dispatcher.BeginInvoke(() => {
if (e.UserId != Cinderella.CinderellaCore.CurrentUser.ResourceId)
return;
GroupListStatusLabel.IsHitTestVisible = true;
GroupListStatusLabel.Text = AppResources.PreludeRetryText;
});
}
