private static HttpRequestMessage SetAuthentication(HttpRequestMessage pushMessageDeliveryRequest, PushSubscription subscription, VapidAuthentication authentication, VapidAuthenticationScheme authenticationScheme)
{
Uri endpointUri = new Uri(subscription.Endpoint);
string audience = endpointUri.Scheme + @"://" + endpointUri.Host;
if (authenticationScheme == VapidAuthenticationScheme.WebPush)
{
VapidAuthentication.WebPushSchemeHeadersValues webPushSchemeHeadersValues = authentication.GetWebPushSchemeHeadersValues(audience);
pushMessageDeliveryRequest.Headers.Authorization = new AuthenticationHeaderValue(WEBPUSH_AUTHENTICATION_SCHEME, webPushSchemeHeadersValues.AuthenticationHeaderValueParameter);
pushMessageDeliveryRequest.Headers.Add(CRYPTO_KEY_HEADER_NAME, webPushSchemeHeadersValues.CryptoKeyHeaderValue);
}
else
{
pushMessageDeliveryRequest.Headers.Authorization = new AuthenticationHeaderValue(VAPID_AUTHENTICATION_SCHEME, authentication.GetVapidSchemeAuthenticationHeaderValueParameter(audience));
}
return(pushMessageDeliveryRequest);
}
/// <summary>
/// Requests delivery of push message by push service as an asynchronous operation.
/// </summary>
/// <param name="subscription">The push service subscription.</param>
/// <param name="message">The push message.</param>
/// <param name="authentication">The authentication details.</param>
/// <param name="authenticationScheme">The <see cref="VapidAuthenticationScheme"/> to use.</param>
/// <param name="cancellationToken">The cancellation token to cancel operation.</param>
/// <returns>The task object representing the asynchronous operation.</returns>
public async Task RequestPushMessageDeliveryAsync(PushSubscription subscription, PushMessage message, VapidAuthentication authentication, VapidAuthenticationScheme authenticationScheme, CancellationToken cancellationToken)
{
HttpRequestMessage pushMessageDeliveryRequest = PreparePushMessageDeliveryRequest(subscription, message, authentication, authenticationScheme);
HttpResponseMessage pushMessageDeliveryRequestResponse = null;
try
{
pushMessageDeliveryRequestResponse = await _httpClient.SendAsync(pushMessageDeliveryRequest, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
int retriesAfterCount = 0;
while (ShouldRetryAfter(pushMessageDeliveryRequestResponse, retriesAfterCount, out TimeSpan delay))
{
pushMessageDeliveryRequest.Dispose();
pushMessageDeliveryRequestResponse.Dispose();
await Task.Delay(delay, cancellationToken);
pushMessageDeliveryRequest = PreparePushMessageDeliveryRequest(subscription, message, authentication, authenticationScheme);
pushMessageDeliveryRequestResponse = await _httpClient.SendAsync(pushMessageDeliveryRequest, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
retriesAfterCount++;
}
await HandlePushMessageDeliveryRequestResponse(pushMessageDeliveryRequestResponse, subscription);
}
finally
{
pushMessageDeliveryRequest.Dispose();
pushMessageDeliveryRequestResponse?.Dispose();
}
}
private HttpRequestMessage PreparePushMessageDeliveryRequest(PushSubscription subscription, PushMessage message, VapidAuthentication authentication, VapidAuthenticationScheme authenticationScheme)
{
authentication = authentication ?? DefaultAuthentication;
if (authentication == null)
{
throw new InvalidOperationException("The VAPID authentication information is not available");
}
HttpRequestMessage pushMessageDeliveryRequest = new HttpRequestMessage(HttpMethod.Post, subscription.Endpoint)
{
Headers =
{
{ TTL_HEADER_NAME, (message.TimeToLive ?? DefaultTimeToLive).ToString(CultureInfo.InvariantCulture) }
}
};
pushMessageDeliveryRequest = SetAuthentication(pushMessageDeliveryRequest, subscription, authentication, authenticationScheme);
pushMessageDeliveryRequest = SetUrgency(pushMessageDeliveryRequest, message);
pushMessageDeliveryRequest = SetTopic(pushMessageDeliveryRequest, message);
pushMessageDeliveryRequest = SetContent(pushMessageDeliveryRequest, subscription, message);
return(pushMessageDeliveryRequest);
}
/// <summary>
/// Requests delivery of push message by push service as an asynchronous operation.
/// </summary>
/// <param name="subscription">The push service subscription.</param>
/// <param name="message">The push message.</param>
/// <param name="authentication">The authentication details.</param>
/// <param name="authenticationScheme">The <see cref="VapidAuthenticationScheme"/> to use.</param>
/// <returns>The task object representing the asynchronous operation.</returns>
public Task RequestPushMessageDeliveryAsync(PushSubscription subscription, PushMessage message, VapidAuthentication authentication, VapidAuthenticationScheme authenticationScheme)
{
return(RequestPushMessageDeliveryAsync(subscription, message, authentication, authenticationScheme, CancellationToken.None));
}
