Function checkKey

key.go:28–44

checkKey checks if the given value is a valid parameter key according to https://httpwg.org/specs/rfc9651.html#param.

(k string)

// checkKey checks if the given value is a valid parameter key according to
// https://httpwg.org/specs/rfc9651.html#param.
func checkKey(k string) error {
	if len(k) == 0 {
		return fmt.Errorf("a key cannot be empty: %w", ErrInvalidKeyFormat)
	}

	if !isLowerCaseAlpha(k[0]) && k[0] != '*' {
		return fmt.Errorf("a key must start with a lower case alpha character or *: %w", ErrInvalidKeyFormat)
	}

	for i := 1; i < len(k); i++ {
		if !isKeyChar(k[i]) {
			return fmt.Errorf("the character %c isn't allowed in a key: %w", k[i], ErrInvalidKeyFormat)
		}
	}

	return nil
}

// marshalKey serializes as defined in
// https://httpwg.org/specs/rfc9651.html#ser-key.