/// <inheritdoc />
public async Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
{
HttpResponse response = context.HttpContext.Response;
ActionValidationModel model = GetModel(context.ActionDescriptor, context.HttpContext.RequestServices);
MemoryStream buffer = null;
Stream initialStream = null;
if (model.BufferResponse)
{
buffer = new MemoryStream();
//replace the context response with our buffer
initialStream = response.Body;
response.Body = buffer;
}
//invoke the rest of the pipeline
await next();
if (model.BufferResponse)
{
Debug.Assert(buffer != null);
//reset the buffer and read out the contents
buffer.Seek(0, SeekOrigin.Begin);
IList <ValidationError> validationErrors = null;
if (response.ContentType != null &&
(response.ContentType.StartsWith(Constants.ContentTypes.ApplicationJson, StringComparison.Ordinal) || response.ContentType.StartsWith(Constants.ContentTypes.TextJson, StringComparison.Ordinal)))
{
ResponseTypeModel responseTypeModel = model.ResponseTypes.SingleOrDefault(r => r.StatusCode == response.StatusCode);
if (responseTypeModel != null)
{
JSchema responseSchema = SchemaGenerator.GetGeneratedSchema(responseTypeModel.Type);
validationErrors = ValidationHelper.Validate(buffer, responseSchema);
//reset to start of stream
buffer.Seek(0, SeekOrigin.Begin);
}
}
//copy our content to the original stream and put it back
await buffer.CopyToAsync(initialStream);
response.Body = initialStream;
if (validationErrors != null && validationErrors.Count > 0)
{
throw JSchemaValidationErrorsException.Create(validationErrors);
}
}
}