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|
package signature
import (
"bytes"
"errors"
"strconv"
"codeberg.org/lindenii/furgit/internal/intconv"
)
// ErrInvalidSignature indicates an attempt to parse an invalid signature.
var ErrInvalidSignature = errors.New("object/signature: invalid signature")
// 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, ErrInvalidSignature
}
gtRel := bytes.IndexByte(line[lt+1:], '>')
if gtRel < 0 {
return nil, 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, ErrInvalidSignature
}
rest = rest[1:]
before, after, ok := bytes.Cut(rest, []byte{' '})
if !ok {
return nil, ErrInvalidSignature
}
when, err := strconv.ParseInt(string(before), 10, 64)
if err != nil {
return nil, ErrInvalidSignature
}
tz := after
if len(tz) < 5 {
return nil, ErrInvalidSignature
}
sign := 1
switch tz[0] {
case '-':
sign = -1
case '+':
default:
return nil, ErrInvalidSignature
}
hh, err := strconv.Atoi(string(tz[1:3]))
if err != nil {
return nil, ErrInvalidSignature
}
mm, err := strconv.Atoi(string(tz[3:5]))
if err != nil {
return nil, ErrInvalidSignature
}
if hh < 0 || hh > 23 {
return nil, ErrInvalidSignature
}
if mm < 0 || mm > 59 {
return nil, ErrInvalidSignature
}
total := int64(hh)*60 + int64(mm)
offset, err := intconv.Int64ToInt32(total)
if err != nil {
return nil, ErrInvalidSignature
}
if sign < 0 {
offset = -offset
}
return &Signature{
Name: nameBytes,
Email: emailBytes,
WhenUnix: when,
OffsetMinutes: offset,
}, nil
}
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