// Copyright 2015 The Gogs Authors. All rights reserved.// Copyright 2019 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package git import (	"fmt"	"strconv"	"strings"	"time" 	"forgejo.org/modules/log"	"forgejo.org/modules/util") // Signature represents the Author, Committer or Tagger information.type Signature struct {	Name  string    // the committer name, it can be anything	Email string    // the committer email, it can be anything	When  time.Time // the timestamp of the signature} func (s *Signature) String() string {	return fmt.Sprintf("%s <%s>", s.Name, s.Email)} // Decode decodes a byte array representing a signature to signaturefunc (s *Signature) Decode(b []byte) {	*s = *parseSignatureFromCommitLine(util.UnsafeBytesToString(b))} // Helper to get a signature from the commit line, which looks like:////	full name <user@example.com> 1378823654 +0200//// Haven't found the official reference for the standard format yet.// This function never fails, if the "line" can't be parsed, it returns a default Signature with "zero" time.func parseSignatureFromCommitLine(line string) *Signature {	sig := &Signature{}	s1, sx, ok1 := strings.Cut(line, " <")	s2, s3, ok2 := strings.Cut(sx, "> ")	if !ok1 || !ok2 {		sig.Name = line		return sig	}	sig.Name, sig.Email = s1, s2 	if strings.Count(s3, " ") == 1 {		ts, tz, _ := strings.Cut(s3, " ")		seconds, _ := strconv.ParseInt(ts, 10, 64)		if tzTime, err := time.Parse("-0700", tz); err == nil {			sig.When = time.Unix(seconds, 0).In(tzTime.Location())		}	} else {		// the old gitea code tried to parse the date in a few different formats, but it's not clear why.		// according to public document, only the standard format "timestamp timezone" could be found, so drop other formats.		log.Error("suspicious commit line format: %q", line)		for _, fmt := range []string{ /*"Mon Jan _2 15:04:05 2006 -0700"*/ } {			if t, err := time.Parse(fmt, s3); err == nil {				sig.When = t				break			}		}	}	return sig}