public async Task <bool> AuthenticateAsync(bool force, CancellationToken ct = default)
{
// https://dev.onedrive.com/auth/msa_oauth.htm
if (!force && _accessCode != null)
{
return(IsAuthenticated);
}
if (await RefreshAccessTokenAsync(ct).ConfigureAwait(false))
{
return(IsAuthenticated);
}
var authorizationCode = AuthorizationProvider.GetAuthorizationCode(this);
if (authorizationCode != null)
{
var parameters = new Dictionary <string, string>(StringComparer.Ordinal);
parameters["client_id"] = ApplicationId;
parameters["redirect_uri"] = ReturnUrl;
//parameters["client_secret"] = "";
parameters["code"] = authorizationCode;
parameters["grant_type"] = "authorization_code";
var result = await PostAsync <OneDriveToken>("https://login.live.com/oauth20_token.srf", new FormUrlEncodedContent(parameters), ct).ConfigureAwait(false);
await HandleTokenResponseAsync(result, ct).ConfigureAwait(false);
}
return(IsAuthenticated);
}