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82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
package httpsfv
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import (
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"errors"
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"fmt"
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"io"
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)
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// ErrInvalidKeyFormat is returned when the format of a parameter or dictionary key is invalid.
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var ErrInvalidKeyFormat = errors.New("invalid key format")
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// isKeyChar checks if c is a valid key characters.
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func isKeyChar(c byte) bool {
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if isLowerCaseAlpha(c) || isDigit(c) {
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return true
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}
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switch c {
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case '_', '-', '.', '*':
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return true
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}
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return false
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}
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// checkKey checks if the given value is a valid parameter key according to
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// https://httpwg.org/specs/rfc9651.html#param.
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func checkKey(k string) error {
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if len(k) == 0 {
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return fmt.Errorf("a key cannot be empty: %w", ErrInvalidKeyFormat)
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}
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if !isLowerCaseAlpha(k[0]) && k[0] != '*' {
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return fmt.Errorf("a key must start with a lower case alpha character or *: %w", ErrInvalidKeyFormat)
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}
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for i := 1; i < len(k); i++ {
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if !isKeyChar(k[i]) {
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return fmt.Errorf("the character %c isn't allowed in a key: %w", k[i], ErrInvalidKeyFormat)
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}
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}
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return nil
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}
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// marshalKey serializes as defined in
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// https://httpwg.org/specs/rfc9651.html#ser-key.
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func marshalKey(b io.StringWriter, k string) error {
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if err := checkKey(k); err != nil {
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return err
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}
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_, err := b.WriteString(k)
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return err
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}
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// parseKey parses as defined in
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// https://httpwg.org/specs/rfc9651.html#parse-key.
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func parseKey(s *scanner) (string, error) {
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if s.eof() {
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return "", &UnmarshalError{s.off, ErrInvalidKeyFormat}
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}
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c := s.data[s.off]
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if !isLowerCaseAlpha(c) && c != '*' {
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return "", &UnmarshalError{s.off, ErrInvalidKeyFormat}
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}
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start := s.off
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s.off++
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for !s.eof() {
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if !isKeyChar(s.data[s.off]) {
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break
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}
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s.off++
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}
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return s.data[start:s.off], nil
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}
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