/// <summary>
/// Converts a CloudEvent to <see cref="HttpContent"/>.
/// </summary>
/// <param name="cloudEvent">The CloudEvent to convert. Must not be null, and must be a valid CloudEvent.</param>
/// <param name="contentMode">Content mode. Structured or binary.</param>
/// <param name="formatter">The formatter to use within the conversion. Must not be null.</param>
public static HttpContent ToHttpContent(this CloudEvent cloudEvent, ContentMode contentMode, CloudEventFormatter formatter)
{
Validation.CheckCloudEventArgument(cloudEvent, nameof(cloudEvent));
Validation.CheckNotNull(formatter, nameof(formatter));
ReadOnlyMemory <byte> content;
// The content type to include in the ContentType header - may be the data content type, or the formatter's content type.
ContentType?contentType;
switch (contentMode)
{
case ContentMode.Structured:
content = formatter.EncodeStructuredModeMessage(cloudEvent, out contentType);
break;
case ContentMode.Binary:
content = formatter.EncodeBinaryModeEventData(cloudEvent);
contentType = MimeUtilities.CreateContentTypeOrNull(formatter.GetOrInferDataContentType(cloudEvent));
break;
default:
throw new ArgumentOutOfRangeException(nameof(contentMode), $"Unsupported content mode: {contentMode}");
}
ByteArrayContent ret = ToByteArrayContent(content);
if (contentType is object)
{
ret.Headers.ContentType = MimeUtilities.ToMediaTypeHeaderValue(contentType);
}
else if (content.Length != 0)
{
throw new ArgumentException(Strings.ErrorContentTypeUnspecified, nameof(cloudEvent));
}
// Map headers in either mode.
// Including the headers in structured mode is optional in the spec (as they're already within the body) but
// can be useful.
ret.Headers.Add(HttpUtilities.SpecVersionHttpHeader, HttpUtilities.EncodeHeaderValue(cloudEvent.SpecVersion.VersionId));
foreach (var attributeAndValue in cloudEvent.GetPopulatedAttributes())
{
CloudEventAttribute attribute = attributeAndValue.Key;
string headerName = HttpUtilities.HttpHeaderPrefix + attribute.Name;
object value = attributeAndValue.Value;
// Skip the data content type attribute in binary mode, because it's already in the content type header.
if (attribute == cloudEvent.SpecVersion.DataContentTypeAttribute && contentMode == ContentMode.Binary)
{
continue;
}
else
{
string headerValue = HttpUtilities.EncodeHeaderValue(attribute.Format(value));
ret.Headers.Add(headerName, headerValue);
}
}
return(ret);
}
private void MapHeaders(CloudEvent cloudEvent, bool includeDataContentType)
{
Headers.Add(HttpUtilities.SpecVersionHttpHeader, HttpUtilities.EncodeHeaderValue(cloudEvent.SpecVersion.VersionId));
foreach (var attributeAndValue in cloudEvent.GetPopulatedAttributes())
{
CloudEventAttribute attribute = attributeAndValue.Key;
string headerName = HttpUtilities.HttpHeaderPrefix + attribute.Name;
object value = attributeAndValue.Value;
// Only map the data content type attribute to a header if we've been asked to
if (attribute == cloudEvent.SpecVersion.DataContentTypeAttribute && !includeDataContentType)
{
continue;
}
else
{
string headerValue = HttpUtilities.EncodeHeaderValue(attribute.Format(value));
Headers.Add(headerName, headerValue);
}
}
}