public static async Task <string> GetIdServerAccessToken(IdServerResourceOwnerClientSettings settings, HttpClientHandler httpClientHandler)
{
await semaphoreSlim.WaitAsync();
try
{
if (settings == null)
{
throw new ArgumentException("Parameter IdServerResourceOwnerClientSettings not provided");
}
int settingsHash = $"{settings.BaseAddress}|{settings.ClientId}|{settings.ClientSecret}|{settings.Scopes}|{settings.UserName}|{settings.Password}".GetHashCode();
if (_idServerAccessTokens.ContainsKey(settingsHash) && _idServerAccessTokens[settingsHash] != null)
{
TokenResponse response = _idServerAccessTokens[settingsHash];
//ToDo: possibly preemptively check if token is still valid
return(response.AccessToken);
}
try
{
IdentityClient identityClient = new IdentityClient(settings.BaseAddress, settings.ClientId, settings.ClientSecret, httpClientHandler);
TokenResponse reponse = await identityClient.RequestTokenAsync(settings.UserName, settings.Password, settings.Scopes).ConfigureAwait(false);
if (reponse == null || string.IsNullOrEmpty(reponse.AccessToken))
{
throw new HttpClientException(System.Net.HttpStatusCode.Unauthorized, "Authorisation error: No AccessToken returned");
}
_idServerAccessTokens.Add(settingsHash, reponse);
return(reponse.AccessToken);
}
catch (Exception exc)
{
throw new HttpClientException(System.Net.HttpStatusCode.Unauthorized, $"Authorisation error: {exc.Message}");
}
}
finally
{
semaphoreSlim.Release();
}
}