public CloudEventJsonInputFormatter(CloudEventFormatter formatter)
{
_formatter = formatter;
SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("application/json"));
SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("application/cloudevents+json"));
SupportedEncodings.Add(Encoding.UTF8);
SupportedEncodings.Add(Encoding.Unicode);
}
/// <summary>
/// Converts this HTTP request into a CloudEvent object.
/// </summary>
/// <param name="httpRequest">The HTTP request to decode. Must not be null.</param>
/// <param name="formatter">The event formatter to use to process the request body. Must not be null.</param>
/// <param name="extensions">The extension attributes to use when populating the CloudEvent. May be null.</param>
/// <returns>The decoded CloudEvent.</returns>
/// <exception cref="ArgumentException">The request does not contain a CloudEvent.</exception>
public static async ValueTask <CloudEvent> ReadCloudEventAsync(this HttpRequest httpRequest,
CloudEventFormatter formatter,
params CloudEventAttribute[] extensionAttributes)
{
if (HasCloudEventsContentType(httpRequest))
{
// TODO: Handle formatter being null
return(await formatter.DecodeStructuredModeMessageAsync(httpRequest.Body, MimeUtilities.CreateContentTypeOrNull(httpRequest.ContentType), extensionAttributes).ConfigureAwait(false));
}
else
{
var headers = httpRequest.Headers;
if (!headers.TryGetValue(HttpUtilities.SpecVersionHttpHeader, out var versionId))
{
throw new ArgumentException("Request is not a CloudEvent");
}
var version = CloudEventsSpecVersion.FromVersionId(versionId.First());
if (version is null)
{
throw new ArgumentException($"Unsupported CloudEvents spec version '{versionId.First()}'");
}
var cloudEvent = new CloudEvent(version, extensionAttributes);
foreach (var header in headers)
{
string attributeName = HttpUtilities.GetAttributeNameFromHeaderName(header.Key);
if (attributeName is null || attributeName == CloudEventsSpecVersion.SpecVersionAttribute.Name)
{
continue;
}
string attributeValue = HttpUtilities.DecodeHeaderValue(header.Value.First());
cloudEvent.SetAttributeFromString(attributeName, attributeValue);
}
cloudEvent.DataContentType = httpRequest.ContentType;
if (httpRequest.Body is Stream body)
{
// TODO: This is a bit ugly. We have code in BinaryDataUtilities to handle this, but
// we'd rather not expose it...
var memoryStream = new MemoryStream();
await body.CopyToAsync(memoryStream).ConfigureAwait(false);
formatter.DecodeBinaryModeEventData(memoryStream.ToArray(), cloudEvent);
}
return(cloudEvent);
}
}
