Function limitResponseSize

imagedata/response_limit.go:35–50

limitResponseSize limits the size of the response body to MaxSrcFileSize (if set). First, it tries to use Content-Length header to check the limit. If Content-Length is not set, it limits the size of the response body by wrapping body reader with hard limit reader.

(r *http.Response, limit int)

// If Content-Length is not set, it limits the size of the response body by wrapping
// body reader with hard limit reader.
func limitResponseSize(r *http.Response, limit int) (*http.Response, error) {
	if limit == 0 {
		return r, nil
	}

	// If Content-Length was set, limit the size of the response body before reading it
	size := int(r.ContentLength)
	if size > limit {
		return nil, newFileSizeError()
	}

	// hard-limit the response body reader
	r.Body = &hardLimitReadCloser{r: r.Body, left: limit}

	return r, nil
}