func checkPreconditions()

in internal/vfs/serving/serving.go [260:287]

• 26 lines of code
• 8 McCabe index (conditional complexity)

func checkPreconditions(w http.ResponseWriter, r *http.Request, modtime time.Time) (done bool) {
	defer slowlogs.Recorder(r.Context(), "serving.checkPreconditions")()
	// This function carefully follows RFC 7232 section 6.
	ch := checkIfMatch(w, r)
	if ch == condNone {
		ch = checkIfUnmodifiedSince(r, modtime)
	}
	if ch == condFalse {
		w.WriteHeader(http.StatusPreconditionFailed)
		return true
	}
	switch checkIfNoneMatch(w, r) {
	case condFalse:
		if r.Method == http.MethodGet || r.Method == http.MethodHead {
			writeNotModified(w)
			return true
		}
		w.WriteHeader(http.StatusPreconditionFailed)
		return true
	case condNone:
		if checkIfModifiedSince(r, modtime) == condFalse {
			writeNotModified(w)
			return true
		}
	}

	return false
}