github.com/gitbundle/modules@v0.0.0-20231025071548-85b91c5c3b01/git/signature_nogogit.go (about)

     1  // Copyright 2023 The GitBundle Inc. All rights reserved.
     2  // Copyright 2017 The Gitea Authors. All rights reserved.
     3  // Use of this source code is governed by a MIT-style
     4  // license that can be found in the LICENSE file.
     5  
     6  // Copyright 2015 The Gogs Authors. All rights reserved.
     7  
     8  //go:build !gogit
     9  
    10  package git
    11  
    12  import (
    13  	"bytes"
    14  	"fmt"
    15  	"strconv"
    16  	"time"
    17  )
    18  
    19  // Signature represents the Author or Committer information.
    20  type Signature struct {
    21  	// Name represents a person name. It is an arbitrary string.
    22  	Name string
    23  	// Email is an email, but it cannot be assumed to be well-formed.
    24  	Email string
    25  	// When is the timestamp of the signature.
    26  	When time.Time
    27  }
    28  
    29  func (s *Signature) String() string {
    30  	return fmt.Sprintf("%s <%s>", s.Name, s.Email)
    31  }
    32  
    33  // Decode decodes a byte array representing a signature to signature
    34  func (s *Signature) Decode(b []byte) {
    35  	sig, _ := newSignatureFromCommitline(b)
    36  	s.Email = sig.Email
    37  	s.Name = sig.Name
    38  	s.When = sig.When
    39  }
    40  
    41  // Helper to get a signature from the commit line, which looks like these:
    42  //
    43  //	author Patrick Gundlach <gundlach@speedata.de> 1378823654 +0200
    44  //	author Patrick Gundlach <gundlach@speedata.de> Thu, 07 Apr 2005 22:13:13 +0200
    45  //
    46  // but without the "author " at the beginning (this method should)
    47  // be used for author and committer.
    48  func newSignatureFromCommitline(line []byte) (sig *Signature, err error) {
    49  	sig = new(Signature)
    50  	emailStart := bytes.LastIndexByte(line, '<')
    51  	emailEnd := bytes.LastIndexByte(line, '>')
    52  	if emailStart == -1 || emailEnd == -1 || emailEnd < emailStart {
    53  		return
    54  	}
    55  
    56  	sig.Name = string(line[:emailStart-1])
    57  	sig.Email = string(line[emailStart+1 : emailEnd])
    58  
    59  	hasTime := emailEnd+2 < len(line)
    60  	if !hasTime {
    61  		return
    62  	}
    63  
    64  	// Check date format.
    65  	firstChar := line[emailEnd+2]
    66  	if firstChar >= 48 && firstChar <= 57 {
    67  		idx := bytes.IndexByte(line[emailEnd+2:], ' ')
    68  		if idx < 0 {
    69  			return
    70  		}
    71  
    72  		timestring := string(line[emailEnd+2 : emailEnd+2+idx])
    73  		seconds, _ := strconv.ParseInt(timestring, 10, 64)
    74  		sig.When = time.Unix(seconds, 0)
    75  
    76  		idx += emailEnd + 3
    77  		if idx >= len(line) || idx+5 > len(line) {
    78  			return
    79  		}
    80  
    81  		timezone := string(line[idx : idx+5])
    82  		tzhours, err1 := strconv.ParseInt(timezone[0:3], 10, 64)
    83  		tzmins, err2 := strconv.ParseInt(timezone[3:], 10, 64)
    84  		if err1 != nil || err2 != nil {
    85  			return
    86  		}
    87  		if tzhours < 0 {
    88  			tzmins *= -1
    89  		}
    90  		tz := time.FixedZone("", int(tzhours*60*60+tzmins*60))
    91  		sig.When = sig.When.In(tz)
    92  	} else {
    93  		sig.When, err = time.Parse(GitTimeLayout, string(line[emailEnd+2:]))
    94  		if err != nil {
    95  			return
    96  		}
    97  	}
    98  	return
    99  }