private async Task Notify(Publication publication, Subscription subscription, HttpContent content)
{
// must clone because sending each payload will cause the http client to
// dispose it, leading to an exception on subsequent notifications
var contentClone = await content.Clone();
var request = new HttpRequestMessage(HttpMethod.Post, subscription.Callback)
{
Content = contentClone
};
request.Headers.Add("link", $"<{publication.HubLocation} />; rel=\"hub\", <{publication.Topic} />; rel=\"self\""); // required headers
if (!string.IsNullOrEmpty(subscription.Secret))
{
var secret = _cryptoFunctions.Decrypt(subscription.Secret, subscription.Callback.ToString());
/* Section 8 */
var hash = _cryptoFunctions.GetHmacSha1Hash(
await contentClone.ReadAsByteArrayAsync(),
secret);
request.Headers.Add("X-Hub-Signature", hash);
}
var response = await _httpClient.SendAsync(request);
if (!response.IsSuccessStatusCode)
{
var message = Strings.Error_SubscriberPublishFailed;
if (response.Content != null)
{
message = $"{(int)response.StatusCode}:{await response.Content.ReadAsStringAsync()}";
}
var args = new PublishNotificationFailureEventArgs(subscription, message);
OnNotifyFailed(args);
}
}
private void OnNotifyFailed(PublishNotificationFailureEventArgs args)
{
PublishNotificationFailed?.Invoke(this, args);
}