/// <summary>
/// Converts this HTTP request into a CloudEvent object, with the given extensions,
/// overriding the formatter.
/// </summary>
/// <param name="httpRequest">HTTP request</param>
/// <param name="formatter">The event formatter to use to process the request body.</param>
/// <param name="extensions">List of extension instances</param>
/// <returns>A CloudEvent instance or 'null' if the request message doesn't hold a CloudEvent</returns>
public static async ValueTask <CloudEvent> ReadCloudEventAsync(this HttpRequest httpRequest,
ICloudEventFormatter formatter,
params CloudEventAttribute[] extensionAttributes)
{
if (HasCloudEventsContentType(httpRequest))
{
// TODO: Handle formatter being null
return(await formatter.DecodeStructuredEventAsync(httpRequest.Body, extensionAttributes).ConfigureAwait(false));
}
else
{
var headers = httpRequest.Headers;
CloudEventsSpecVersion version = CloudEventsSpecVersion.Default;
if (headers.TryGetValue(HttpUtilities.SpecVersionHttpHeader, out var values))
{
string versionId = values.First();
version = CloudEventsSpecVersion.FromVersionId(versionId);
}
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.
var memoryStream = new MemoryStream();
await body.CopyToAsync(memoryStream).ConfigureAwait(false);
if (memoryStream.Length != 0)
{
cloudEvent.Data = formatter.DecodeData(memoryStream.ToArray(), cloudEvent.DataContentType);
}
}
return(cloudEvent);
}
}
private static async Task <CloudEvent> ToCloudEventInternalAsync(HttpHeaders headers, HttpContent content,
ICloudEventFormatter formatter, IEnumerable <CloudEventAttribute> extensionAttributes)
{
if (HasCloudEventsContentType(content))
{
// FIXME: Handle no formatter being specified.
var stream = await content.ReadAsStreamAsync().ConfigureAwait(false);
return(await formatter.DecodeStructuredEventAsync(stream, extensionAttributes).ConfigureAwait(false));
}
else
{
CloudEventsSpecVersion version = CloudEventsSpecVersion.Default;
if (headers.Contains(HttpUtilities.SpecVersionHttpHeader))
{
string versionId = headers.GetValues(HttpUtilities.SpecVersionHttpHeader).First();
version = CloudEventsSpecVersion.FromVersionId(versionId);
}
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);
}
if (content is object)
{
// TODO: Should this just be the media type? We probably need to take a full audit of this...
cloudEvent.DataContentType = content.Headers?.ContentType?.ToString();
var data = await content.ReadAsByteArrayAsync().ConfigureAwait(false);
cloudEvent.Data = formatter.DecodeData(data, cloudEvent.DataContentType);
}
return(cloudEvent);
}
}
/// <summary>
/// Converts this HTTP request into a CloudEvent object, with the given extensions,
/// overriding the formatter.
/// </summary>
/// <param name="httpRequest">HTTP request</param>
/// <param name="formatter"></param>
/// <param name="extensions">List of extension instances</param>
/// <returns>A CloudEvent instance or 'null' if the request message doesn't hold a CloudEvent</returns>
public static async ValueTask <CloudEvent> ReadCloudEventAsync(this HttpRequest httpRequest,
ICloudEventFormatter formatter = null,
params ICloudEventExtension[] extensions)
{
if (httpRequest.ContentType != null &&
httpRequest.ContentType.StartsWith(CloudEvent.MediaType,
StringComparison.InvariantCultureIgnoreCase))
{
// handle structured mode
if (formatter == null)
{
// if we didn't get a formatter, pick one
var contentType = httpRequest.ContentType.Split(';')[0].Trim();
if (contentType.EndsWith(JsonEventFormatter.MediaTypeSuffix,
StringComparison.InvariantCultureIgnoreCase))
{
formatter = jsonFormatter;
}
else
{
throw new InvalidOperationException("Unsupported CloudEvents encoding");
}
}
return(await formatter.DecodeStructuredEventAsync(httpRequest.Body, extensions));
}
else
{
CloudEventsSpecVersion version = CloudEventsSpecVersion.Default;
if (httpRequest.Headers[SpecVersionHttpHeader1] != StringValues.Empty)
{
version = CloudEventsSpecVersion.V0_1;
}
if (httpRequest.Headers[SpecVersionHttpHeader2] != StringValues.Empty)
{
switch (httpRequest.Headers[SpecVersionHttpHeader2])
{
case "0.2":
version = CloudEventsSpecVersion.V0_2;
break;
case "0.3":
version = CloudEventsSpecVersion.V0_3;
break;
default:
version = CloudEventsSpecVersion.Default;
break;
}
}
var cloudEvent = new CloudEvent(version, extensions);
var attributes = cloudEvent.GetAttributes();
foreach (var httpRequestHeader in httpRequest.Headers.Keys)
{
if (httpRequestHeader.Equals(SpecVersionHttpHeader1,
StringComparison.InvariantCultureIgnoreCase) ||
httpRequestHeader.Equals(SpecVersionHttpHeader2, StringComparison.InvariantCultureIgnoreCase))
{
continue;
}
if (httpRequestHeader.StartsWith(HttpHeaderPrefix, StringComparison.InvariantCultureIgnoreCase))
{
string headerValue = WebUtility.UrlDecode(httpRequest.Headers[httpRequestHeader]);
// maps in headers have been abolished in 1.0
if (version != CloudEventsSpecVersion.V1_0 &&
headerValue.StartsWith("{") && headerValue.EndsWith("}") ||
headerValue.StartsWith("[") && headerValue.EndsWith("]"))
{
attributes[httpRequestHeader.Substring(3)] =
JsonConvert.DeserializeObject(headerValue);
}
else
{
attributes[httpRequestHeader.Substring(3)] = headerValue;
}
}
}
cloudEvent.DataContentType = httpRequest.ContentType != null
? new ContentType(httpRequest.ContentType)
: null;
cloudEvent.Data = await new StreamReader(httpRequest.Body, Encoding.UTF8).ReadToEndAsync();
return(cloudEvent);
}
}
