Resolved! @ma_il helped me understand how the broker actually evaluates the redirect callback and it led me back to square one where I realized I assumed WebAuthenticationOptions.UseTitle was the proper usage. Not so. Up against Imgur's API using a token, it requires WebAuthenticationOptions.None
and it worked immediately.
As an example to future answer-seekers, here's my code.
private const string clientId = "---------";
private static Uri endUri = WebAuthenticationBroker.GetCurrentApplicationCallbackUri();
private static string authorizeString = "https://api.imgur.com/oauth2/authorize?"
+ "client_id="
+ clientId
+ "&response_type=token"
+ "&state=somestateyouwant"
+ "&redirect_uri="
+ endUri;
private Uri startUri = new Uri(authorizeString);
public async void RequestToken() {
try {
WebAuthenticationResult webAuthenticationResult =
await WebAuthenticationBroker.AuthenticateAsync(WebAuthenticationOptions.None
, startUri
, endUri);
if (webAuthenticationResult.ResponseStatus == WebAuthenticationStatus.Success) {
string token = webAuthenticationResult.ResponseData;
// now you have the token
}
} catch { throw; }
}