1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
package signature
import (
"bytes"
"fmt"
"strconv"
"lindenii.org/go/lgo/intconv"
)
// Parse parses a canonical Git signature line.
//
// Labels: Life-Independent.
func Parse(line []byte) (*Signature, error) {
lt := bytes.IndexByte(line, '<')
if lt < 0 {
return nil, fmt.Errorf("%w: missing '<' before email", ErrInvalidSignature)
}
gtRel := bytes.IndexByte(line[lt+1:], '>')
if gtRel < 0 {
return nil, fmt.Errorf("%w: missing '>' after email", ErrInvalidSignature)
}
gt := lt + 1 + gtRel
nameBytes := append([]byte(nil), bytes.TrimRight(line[:lt], " ")...)
emailBytes := append([]byte(nil), line[lt+1:gt]...)
rest := line[gt+1:]
if len(rest) == 0 || rest[0] != ' ' {
return nil, fmt.Errorf("%w: missing ' ' before timestamp", ErrInvalidSignature)
}
rest = rest[1:]
before, after, ok := bytes.Cut(rest, []byte{' '})
if !ok {
return nil, fmt.Errorf("%w: missing ' ' between timestamp and timezone", ErrInvalidSignature)
}
when, err := strconv.ParseInt(string(before), 10, 64)
if err != nil {
return nil, fmt.Errorf("%w: timestamp %q: %w", ErrInvalidSignature, before, err)
}
tz := after
if len(tz) < 5 {
return nil, fmt.Errorf("%w: timezone %q is too short", ErrInvalidSignature, tz)
}
sign := 1
switch tz[0] {
case '-':
sign = -1
case '+':
default:
return nil, fmt.Errorf("%w: timezone sign %q is not '+' or '-'", ErrInvalidSignature, tz[0])
}
hh, err := strconv.Atoi(string(tz[1:3]))
if err != nil {
return nil, fmt.Errorf("%w: timezone hour %q: %w", ErrInvalidSignature, tz[1:3], err)
}
mm, err := strconv.Atoi(string(tz[3:5]))
if err != nil {
return nil, fmt.Errorf("%w: timezone minute %q: %w", ErrInvalidSignature, tz[3:5], err)
}
if hh < 0 || hh > 23 {
return nil, fmt.Errorf("%w: timezone hour %d out of range", ErrInvalidSignature, hh)
}
if mm < 0 || mm > 59 {
return nil, fmt.Errorf("%w: timezone minute %d out of range", ErrInvalidSignature, mm)
}
total := int64(hh)*60 + int64(mm)
offset, err := intconv.Int64ToInt32(total)
if err != nil {
return nil, fmt.Errorf("%w: timezone offset out of range", ErrInvalidSignature)
}
if sign < 0 {
offset = -offset
}
return &Signature{
Name: nameBytes,
Email: emailBytes,
WhenUnix: when,
OffsetMinutes: offset,
}, nil
}
|
