/// <summary>
/// Returns the event data for this <paramref name="notificationId"/> from the authenticated source so that we
/// know that it is valid.
/// </summary>
/// <param name="request">The incoming <see cref="HttpRequest">.</see></param>
/// <param name="routeData">The <see cref="RouteData"/> for the <paramref name="request"/>.</param>
/// <param name="notificationId">The notification identifier from the <paramref name="request"/> body.</param>
/// <returns>
/// A <see cref="Task{JObject}"/> that on completion provides a <see cref="JObject"/> containing event data for
/// this <paramref name="notificationId"/>.
/// </returns>
protected virtual async Task <JObject> GetEventDataAsync(
HttpRequest request,
RouteData routeData,
string notificationId)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
if (routeData == null)
{
throw new ArgumentNullException(nameof(routeData));
}
if (notificationId == null)
{
throw new ArgumentNullException(nameof(notificationId));
}
// Create HTTP request for requesting authoritative event data from Stripe
var secretKey = await GetReceiverConfig(
request, routeData,
ReceiverName,
StripeConstants.SecretKeyMinLength,
StripeConstants.SecretKeyMaxLength);
var address = string.Format(
CultureInfo.InvariantCulture,
StripeConstants.EventUriTemplate,
notificationId);
var outgoing = new HttpRequestMessage(HttpMethod.Get, address);
var challenge = Encoding.UTF8.GetBytes(secretKey + ":");
outgoing.Headers.Authorization = new AuthenticationHeaderValue(
"Basic",
EncodingUtilities.ToBase64(challenge, uriSafe: false));
using (var response = await _httpClient.SendAsync(outgoing))
{
if (!response.IsSuccessStatusCode)
{
Logger.LogError(
3,
"The notification identifier '{NotificationId}' could not be resolved for an actual event. " +
"Callback failed with status code {StatusCode}",
notificationId,
response.StatusCode);
return(null);
}
var responseStream = await response.Content.ReadAsStreamAsync();
var result = await JObject.LoadAsync(new JsonTextReader(new StreamReader(responseStream)));
return(result);
}
}
private static void Base64RoundTrip(string input, bool uriSafe)
{
byte[] data = Encoding.UTF8.GetBytes(input);
string encoded = EncodingUtilities.ToBase64(data, uriSafe);
byte[] output = EncodingUtilities.FromBase64(encoded);
string actual = Encoding.UTF8.GetString(output);
Assert.Equal(input, actual);
}
