async Task <JToken> CallInternalAsync(FormUrlEncodedContent content, int attemptNumber)
{
CancellationToken.ThrowIfCancellationRequested();
await EnsureApiClientAsync();
try {
var response = await apiClient.PostAsync("/api/1", content, CancellationToken);
if (!response.IsSuccessStatusCode)
{
throw new HttpRequestException("invalid HTTP request");
}
var stream = await response.Content.ReadAsStreamAsync();
var json = (JObject)JToken.ReadFrom(new JsonTextReader(new StreamReader(stream)));
if (json ["status"].Value <string> () != "ok")
{
Console.Error.WriteLine(json);
throw new HttpRequestException("JSON result is not status==ok");
}
return(json ["result"]);
} catch (Exception e) when(!(e is HttpRequestException))
{
apiClient = null;
tokenEndpointResponse = null;
if (attemptNumber >= MaxRetryAttempts)
{
throw;
}
return(await CallInternalAsync(content, attemptNumber ++));
}
}
async Task RefreshAccessTokenAsync()
{
var client = CreateHttp();
client.DefaultRequestHeaders.Authorization = clientCredentials.ToHttpBasicAuthentication();
var response = await client.PostAsync(
"/oauth2/token",
CreateHttpContent ("grant_type", "client_credentials")
);
tokenEndpointResponse = await response.Content.ReadAsJsonAsync <TokenEndpointResponse> ();
if (tokenEndpointResponse?.ErrorCode != null)
{
throw new TokenEndpointException(tokenEndpointResponse);
}
if (!response.IsSuccessStatusCode)
{
throw new HttpRequestException("invalid HTTP request with no TokenEndpointResponse");
}
}
public TokenEndpointException(TokenEndpointResponse response)
: base(String.Format ("HTTP request error: {0} ({1})",
response.ErrorCode, response.ErrorDescription))
{
Response = response;
}
public TokenEndpointException(TokenEndpointResponse response)
: base(String.Format("HTTP request error: {0} ({1})",
response.ErrorCode, response.ErrorDescription))
{
Response = response;
}
