internal static (string body, bool isBase64Encoded) ConvertAspNetCoreBodyToLambdaBody(Stream aspNetCoreBody, ResponseContentEncoding rcEncoding)
{
// Do we encode the response content in Base64 or treat it as UTF-8
if (rcEncoding == ResponseContentEncoding.Base64)
{
// We want to read the response content "raw" and then Base64 encode it
byte[] bodyBytes;
if (aspNetCoreBody is MemoryStream)
{
bodyBytes = ((MemoryStream)aspNetCoreBody).ToArray();
}
else
{
using (var ms = new MemoryStream())
{
aspNetCoreBody.CopyTo(ms);
bodyBytes = ms.ToArray();
}
}
return(body : Convert.ToBase64String(bodyBytes), isBase64Encoded : true);
}
else if (aspNetCoreBody is MemoryStream)
{
return(body : UTF8Encoding.UTF8.GetString(((MemoryStream)aspNetCoreBody).ToArray()), isBase64Encoded : false);
}
else
{
aspNetCoreBody.Position = 0;
using (StreamReader reader = new StreamReader(aspNetCoreBody, Encoding.UTF8))
{
return(body : reader.ReadToEnd(), isBase64Encoded : false);
}
}
}
/// <summary>
/// Registers a mapping from a MIME content type to a <see cref="ResponseContentEncoding"/>.
/// </summary>
/// <remarks>
/// The mappings in combination with the <see cref="DefaultResponseContentEncoding"/>
/// setting will dictate if and how response content should be transformed before being
/// returned to the calling API Gateway instance.
/// <para>
/// The interface between the API Gateway and Lambda provides for repsonse content to
/// be returned as a UTF-8 string. In order to return binary content without incurring
/// any loss or corruption due to transformations to the UTF-8 encoding, it is necessary
/// to encode the raw response content in Base64 and to annotate the response that it is
/// Base64-encoded.
/// </para><para>
/// <b>NOTE:</b> In order to use this mechanism to return binary response content, in
/// addition to registering here any binary MIME content types that will be returned by
/// your application, it also necessary to register those same content types with the API
/// Gateway using either the console or the REST interface. Check the developer guide for
/// further information.
/// http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-payload-encodings-configure-with-console.html
/// http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-payload-encodings-configure-with-control-service-api.html
/// </para>
/// </remarks>
public void RegisterResponseContentEncodingForContentType(string contentType, ResponseContentEncoding encoding)
{
_responseContentEncodingForContentType[contentType] = encoding;
}