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Refactor commit signature parser (#30228)

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To make it more flexible and support SSH signature.

The existing tests are not changed, there are also tests covering
`parseTagRef` which also calls `parsePayloadSignature` now. Add some new
tests to `Test_parseTagData`
This commit is contained in:
wxiaoguang 2024-04-02 04:23:17 +08:00 committed by GitHub
parent ca297a90fb
commit 0db554fa63
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194

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7 changed files with 135 additions and 99 deletions
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6
modules/git/commit.go
View File

@ -26,14 +26,14 @@ type Commit struct {
Author *Signature
Committer *Signature
CommitMessage string
Signature *CommitGPGSignature
Signature *CommitSignature
Parents []ObjectID // ID strings
submoduleCache *ObjectCache
}
// CommitGPGSignature represents a git commit signature part.
type CommitGPGSignature struct {
// CommitSignature represents a git commit signature part.
type CommitSignature struct {
Signature string
Payload string // TODO check if can be reconstruct from the rest of commit information to not have duplicate data
}

4
modules/git/commit_convert_gogit.go
View File

@ -13,7 +13,7 @@ import (
"github.com/go-git/go-git/v5/plumbing/object"
)
func convertPGPSignature(c *object.Commit) *CommitGPGSignature {
func convertPGPSignature(c *object.Commit) *CommitSignature {
if c.PGPSignature == "" {
return nil
}
@ -57,7 +57,7 @@ func convertPGPSignature(c *object.Commit) *CommitGPGSignature {
return nil
}
return &CommitGPGSignature{
return &CommitSignature{
Signature: c.PGPSignature,
Payload: w.String(),
}

2
modules/git/commit_reader.go
View File

@ -99,7 +99,7 @@ readLoop:
}
}
commit.CommitMessage = messageSB.String()
commit.Signature = &CommitGPGSignature{
commit.Signature = &CommitSignature{
Signature: signatureSB.String(),
Payload: payloadSB.String(),
}

10
modules/git/repo_tag.go
View File

@ -185,17 +185,15 @@ func parseTagRef(ref map[string]string) (tag *Tag, err error) {
tag.Tagger = parseSignatureFromCommitLine(ref["creator"])
tag.Message = ref["contents"]
// strip PGP signature if present in contents field
pgpStart := strings.Index(tag.Message, beginpgp)
if pgpStart >= 0 {
tag.Message = tag.Message[0:pgpStart]
}
// strip any signature if present in contents field
_, tag.Message, _ = parsePayloadSignature(util.UnsafeStringToBytes(tag.Message), 0)
// annotated tag with GPG signature
if tag.Type == "tag" && ref["contents:signature"] != "" {
payload := fmt.Sprintf("object %s\ntype commit\ntag %s\ntagger %s\n\n%s\n",
tag.Object, tag.Name, ref["creator"], strings.TrimSpace(tag.Message))
tag.Signature = &CommitGPGSignature{
tag.Signature = &CommitSignature{
Signature: ref["contents:signature"],
Payload: payload,
}

2
modules/git/repo_tag_test.go
View File

@ -315,7 +315,7 @@ qbHDASXl
Type: "tag",
Tagger: parseSignatureFromCommitLine("Foo Bar <foo@bar.com> 1565789218 +0300"),
Message: "Add changelog of v1.9.1 (#7859)\n\n* add changelog of v1.9.1\n* Update CHANGELOG.md",
Signature: &CommitGPGSignature{
Signature: &CommitSignature{
Signature: `-----BEGIN PGP SIGNATURE-----
aBCGzBAABCgAdFiEEyWRwv/q1Q6IjSv+D4IPOwzt33PoFAmI8jbIACgkQ4IPOwzt3

104
modules/git/tag.go
View File

@ -6,16 +6,10 @@ package git
import (
"bytes"
"sort"
"strings"
"code.gitea.io/gitea/modules/util"
)
const (
beginpgp = "\n-----BEGIN PGP SIGNATURE-----\n"
endpgp = "\n-----END PGP SIGNATURE-----"
)
// Tag represents a Git tag.
type Tag struct {
Name string
@ -24,7 +18,7 @@ type Tag struct {
Type string
Tagger *Signature
Message string
Signature *CommitGPGSignature
Signature *CommitSignature
}
// Commit return the commit of the tag reference
@ -32,6 +26,36 @@ func (tag *Tag) Commit(gitRepo *Repository) (*Commit, error) {
return gitRepo.getCommit(tag.Object)
}
func parsePayloadSignature(data []byte, messageStart int) (payload, msg, sign string) {
pos := messageStart
signStart, signEnd := -1, -1
for {
eol := bytes.IndexByte(data[pos:], '\n')
if eol < 0 {
break
}
line := data[pos : pos+eol]
signType, hasPrefix := bytes.CutPrefix(line, []byte("-----BEGIN "))
signType, hasSuffix := bytes.CutSuffix(signType, []byte(" SIGNATURE-----"))
if hasPrefix && hasSuffix {
signEndBytes := append([]byte("\n-----END "), signType...)
signEndBytes = append(signEndBytes, []byte(" SIGNATURE-----")...)
signEnd = bytes.Index(data[pos:], signEndBytes)
if signEnd != -1 {
signStart = pos
signEnd = pos + signEnd + len(signEndBytes)
}
}
pos += eol + 1
}
if signStart != -1 && signEnd != -1 {
msgEnd := max(messageStart, signStart-1)
return string(data[:msgEnd]), string(data[messageStart:msgEnd]), string(data[signStart:signEnd])
}
return string(data), string(data[messageStart:]), ""
}
// Parse commit information from the (uncompressed) raw
// data from the commit object.
// \n\n separate headers from message
@ -40,47 +64,37 @@ func parseTagData(objectFormat ObjectFormat, data []byte) (*Tag, error) {
tag.ID = objectFormat.EmptyObjectID()
tag.Object = objectFormat.EmptyObjectID()
tag.Tagger = &Signature{}
// we now have the contents of the commit object. Let's investigate...
nextline := 0
l:
pos := 0
for {
eol := bytes.IndexByte(data[nextline:], '\n')
switch {
case eol > 0:
line := data[nextline : nextline+eol]
spacepos := bytes.IndexByte(line, ' ')
reftype := line[:spacepos]
switch string(reftype) {
case "object":
id, err := NewIDFromString(string(line[spacepos+1:]))
if err != nil {
return nil, err
}
tag.Object = id
case "type":
// A commit can have one or more parents
tag.Type = string(line[spacepos+1:])
case "tagger":
tag.Tagger = parseSignatureFromCommitLine(util.UnsafeBytesToString(line[spacepos+1:]))
}
nextline += eol + 1
case eol == 0:
tag.Message = string(data[nextline+1:])
break l
default:
break l
eol := bytes.IndexByte(data[pos:], '\n')
if eol == -1 {
break // shouldn't happen, but could just tolerate it
}
if eol == 0 {
pos++
break // end of headers
}
line := data[pos : pos+eol]
key, val, _ := bytes.Cut(line, []byte(" "))
switch string(key) {
case "object":
id, err := NewIDFromString(string(val))
if err != nil {
return nil, err
}
tag.Object = id
case "type":
tag.Type = string(val) // A commit can have one or more parents
case "tagger":
tag.Tagger = parseSignatureFromCommitLine(util.UnsafeBytesToString(val))
}
pos += eol + 1
}
idx := strings.LastIndex(tag.Message, beginpgp)
if idx > 0 {
endSigIdx := strings.Index(tag.Message[idx:], endpgp)
if endSigIdx > 0 {
tag.Signature = &CommitGPGSignature{
Signature: tag.Message[idx+1 : idx+endSigIdx+len(endpgp)],
Payload: string(data[:bytes.LastIndex(data, []byte(beginpgp))+1]),
}
tag.Message = tag.Message[:idx+1]
}
payload, msg, sign := parsePayloadSignature(data, pos)
tag.Message = msg
if len(sign) > 0 {
tag.Signature = &CommitSignature{Signature: sign, Payload: payload}
}
return tag, nil
}

106
modules/git/tag_test.go
View File

@ -12,24 +12,28 @@ import (
func Test_parseTagData(t *testing.T) {
testData := []struct {
data []byte
tag Tag
data string
expected Tag
}{
{data: []byte(`object 3b114ab800c6432ad42387ccf6bc8d4388a2885a
{
data: `object 3b114ab800c6432ad42387ccf6bc8d4388a2885a
type commit
tag 1.22.0
tagger Lucas Michot <lucas@semalead.com> 1484491741 +0100
`), tag: Tag{
Name: "",
ID: Sha1ObjectFormat.EmptyObjectID(),
Object: &Sha1Hash{0x3b, 0x11, 0x4a, 0xb8, 0x0, 0xc6, 0x43, 0x2a, 0xd4, 0x23, 0x87, 0xcc, 0xf6, 0xbc, 0x8d, 0x43, 0x88, 0xa2, 0x88, 0x5a},
Type: "commit",
Tagger: &Signature{Name: "Lucas Michot", Email: "lucas@semalead.com", When: time.Unix(1484491741, 0)},
Message: "",
Signature: nil,
}},
{data: []byte(`object 7cdf42c0b1cc763ab7e4c33c47a24e27c66bfccc
`,
expected: Tag{
Name: "",
ID: Sha1ObjectFormat.EmptyObjectID(),
Object: MustIDFromString("3b114ab800c6432ad42387ccf6bc8d4388a2885a"),
Type: "commit",
Tagger: &Signature{Name: "Lucas Michot", Email: "lucas@semalead.com", When: time.Unix(1484491741, 0).In(time.FixedZone("", 3600))},
Message: "",
Signature: nil,
},
},
{
data: `object 7cdf42c0b1cc763ab7e4c33c47a24e27c66bfccc
type commit
tag 1.22.1
tagger Lucas Michot <lucas@semalead.com> 1484553735 +0100
@ -37,37 +41,57 @@ tagger Lucas Michot <lucas@semalead.com> 1484553735 +0100
test message
o
ono`), tag: Tag{
Name: "",
ID: Sha1ObjectFormat.EmptyObjectID(),
Object: &Sha1Hash{0x7c, 0xdf, 0x42, 0xc0, 0xb1, 0xcc, 0x76, 0x3a, 0xb7, 0xe4, 0xc3, 0x3c, 0x47, 0xa2, 0x4e, 0x27, 0xc6, 0x6b, 0xfc, 0xcc},
Type: "commit",
Tagger: &Signature{Name: "Lucas Michot", Email: "lucas@semalead.com", When: time.Unix(1484553735, 0)},
Message: "test message\no\n\nono",
Signature: nil,
}},
ono`,
expected: Tag{
Name: "",
ID: Sha1ObjectFormat.EmptyObjectID(),
Object: MustIDFromString("7cdf42c0b1cc763ab7e4c33c47a24e27c66bfccc"),
Type: "commit",
Tagger: &Signature{Name: "Lucas Michot", Email: "lucas@semalead.com", When: time.Unix(1484553735, 0).In(time.FixedZone("", 3600))},
Message: "test message\no\n\nono",
Signature: nil,
},
},
{
data: `object 7cdf42c0b1cc763ab7e4c33c47a24e27c66bfaaa
type commit
tag v0
tagger dummy user <dummy-email@example.com> 1484491741 +0100
dummy message
-----BEGIN SSH SIGNATURE-----
dummy signature
-----END SSH SIGNATURE-----
`,
expected: Tag{
Name: "",
ID: Sha1ObjectFormat.EmptyObjectID(),
Object: MustIDFromString("7cdf42c0b1cc763ab7e4c33c47a24e27c66bfaaa"),
Type: "commit",
Tagger: &Signature{Name: "dummy user", Email: "dummy-email@example.com", When: time.Unix(1484491741, 0).In(time.FixedZone("", 3600))},
Message: "dummy message",
Signature: &CommitSignature{
Signature: `-----BEGIN SSH SIGNATURE-----
dummy signature
-----END SSH SIGNATURE-----`,
Payload: `object 7cdf42c0b1cc763ab7e4c33c47a24e27c66bfaaa
type commit
tag v0
tagger dummy user <dummy-email@example.com> 1484491741 +0100
dummy message`,
},
},
},
}
for _, test := range testData {
tag, err := parseTagData(Sha1ObjectFormat, test.data)
tag, err := parseTagData(Sha1ObjectFormat, []byte(test.data))
assert.NoError(t, err)
assert.EqualValues(t, test.tag.ID, tag.ID)
assert.EqualValues(t, test.tag.Object, tag.Object)
assert.EqualValues(t, test.tag.Name, tag.Name)
assert.EqualValues(t, test.tag.Message, tag.Message)
assert.EqualValues(t, test.tag.Type, tag.Type)
if test.tag.Signature != nil && assert.NotNil(t, tag.Signature) {
assert.EqualValues(t, test.tag.Signature.Signature, tag.Signature.Signature)
assert.EqualValues(t, test.tag.Signature.Payload, tag.Signature.Payload)
} else {
assert.Nil(t, tag.Signature)
}
if test.tag.Tagger != nil && assert.NotNil(t, tag.Tagger) {
assert.EqualValues(t, test.tag.Tagger.Name, tag.Tagger.Name)
assert.EqualValues(t, test.tag.Tagger.Email, tag.Tagger.Email)
assert.EqualValues(t, test.tag.Tagger.When.Unix(), tag.Tagger.When.Unix())
} else {
assert.Nil(t, tag.Tagger)
}
assert.Equal(t, test.expected, *tag)
}
tag, err := parseTagData(Sha1ObjectFormat, []byte("type commit\n\nfoo\n-----BEGIN SSH SIGNATURE-----\ncorrupted..."))
assert.NoError(t, err)
assert.Equal(t, "foo\n-----BEGIN SSH SIGNATURE-----\ncorrupted...", tag.Message)
}