Token refreshing C#

Melisek An 'invalid_grant' error typically indicates an misconfiguration of the parameters for the OAuth flow, such as an incorrect authorization code, mismatched redirect URI, etc. You should be able to get a more specific error message like this:

try
{
    // ... your ProcessCodeFlowAsync call ...

}
catch (OAuth2Exception ex)
{
// ...
	Console.WriteLine(ex.ErrorDescription);
// ...
}

It prints out a redirect_uri mismatch

Melisek That indicates that the redirect URI you're supplying when exchanging the authorization code doesn't match the one used to retrieve it originally. Make sure you're supplying the same redirectUri value to both GetAuthorizeUri and ProcessCodeFlowAsync.

I had a mismatch of variables because of letter capitalization. Now i get the refresh token, acces token, uid, expiration date and the scopes returned, yet i still get the 400 Bad request error when calling client functions.

Melisek,

Name all your vars properly to avoid confusion! For instance, is 'RedirectUri' really means redirect URI or ... something else? 😉

I copied the code from the repo. 

They are named almost the same

and they will be temporary as i don't need oauth on users for my app.

private static readonly Uri RedirectUri = new Uri(LoopbackHost + "authorize");
var redirectUri = await HandleJSRedirect(http);

Melisek For the 400 error, please share the full error message as well as the relevant code snippet.

I'm catching an HttpRequestException using this

catch(HttpRequestException ex)
{
    Debug.WriteLine(ex.ToString());
}

trying to get acces using this

private async Task<List<string>> GetUpdateList(string dirPath)
        {
            List<string> list = new List<string>();
            var files = await dbx.Files.ListFolderAsync(dirPath);
            fileNames.Clear();

            foreach (var item in files.Entries.Where(i => i.IsFile))
            {
                fileNames.Add(item.Name);
                list.Add(item.Name[..^4]);
            }

            return list;
        }

And it logs

System.Net.Http.HttpRequestException: Response status code does not indicate success: 400 (Bad Request).
at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
at Dropbox.Api.DropboxRequestHandler.RefreshAccessToken(String[] scopeList)
at Dropbox.Api.DropboxRequestHandler.CheckAndRefreshAccessToken()
at Dropbox.Api.DropboxRequestHandler.RequestJsonStringWithRetry(String host, String routeName, String auth, RouteStyle routeStyle, String requestArg, Stream body)
at Dropbox.Api.DropboxRequestHandler.Dropbox.Api.Stone.ITransport.SendRpcRequestAsync[TRequest,TResponse,TError](TRequest request, String host, String route, String auth, IEncoder`1 requestEncoder, IDecoder`1 responseDecoder, IDecoder`1 errorDecoder)
at MelisekGameManager.RWindow.GetUpdateList(String dirPath) in C:\Programming\C#\MelisekGameManager\MelisekGameManager\RWindow.cs:line 167
at MelisekGameManager.RWindow.gameSelect_SelectionChangeCommitted(Object sender, EventArgs e) in C:\Programming\C#\MelisekGameManager\MelisekGameManager\RWindow.cs:line 231

'dbx' object seems not properly initialized.

Take a look how have you initialized it.

Yep, i was setting a different refresh token after i requested one from the api. Now everything works perfectly! Thanks for your time.