osascript_parse.go RawHistoryFolder

1package clipboard
2
3import (
4	"encoding/hex"
5	"errors"
6	"strings"
7)
8
9const (
10	osaDataPrefix = "«data "
11	osaDataSuffix = "»"
12	osaClassLen   = 4
13)
14
15// parseOSAData decodes osascript's textual representation of an AppleScript
16// data value: «data CLASSHEX». osascript terminates successful output with a
17// newline, so surrounding whitespace is ignored; all other bytes must belong
18// to the data value.
19func parseOSAData(output, class string) ([]byte, error) {
20	if len(class) != osaClassLen {
21		return nil, errors.New("clipboard: invalid expected osascript data class")
22	}
23
24	output = strings.TrimSpace(output)
25	if !strings.HasPrefix(output, osaDataPrefix) || !strings.HasSuffix(output, osaDataSuffix) {
26		return nil, errors.New("clipboard: invalid osascript data output")
27	}
28
29	payload := strings.TrimSuffix(strings.TrimPrefix(output, osaDataPrefix), osaDataSuffix)
30	if !strings.HasPrefix(payload, class) {
31		return nil, errors.New("clipboard: unexpected osascript data class")
32	}
33	hexData := strings.TrimPrefix(payload, class)
34	if hexData == "" {
35		return nil, errors.New("clipboard: osascript data output has no data")
36	}
37
38	data, err := hex.DecodeString(hexData)
39	if err != nil || len(data) == 0 {
40		return nil, errors.New("clipboard: invalid osascript data hex")
41	}
42	return data, nil
43}