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forgejo/modules/git/commit_reader.go
Lunny Xiao 4eb2a29910
Improve ObjectFormat interface (#28496)
The 4 functions are duplicated, especially as interface methods. I think
we just need to keep `MustID` the only one and remove other 3.

```
MustID(b []byte) ObjectID
MustIDFromString(s string) ObjectID
NewID(b []byte) (ObjectID, error)
NewIDFromString(s string) (ObjectID, error)
```

Introduced the new interfrace method `ComputeHash` which will replace
the interface `HasherInterface`. Now we don't need to keep two
interfaces.

Reintroduced `git.NewIDFromString` and `git.MustIDFromString`. The new
function will detect the hash length to decide which objectformat of it.
If it's 40, then it's SHA1. If it's 64, then it's SHA256. This will be
right if the commitID is a full one. So the parameter should be always a
full commit id.

@AdamMajer Please review.
2023-12-19 07:20:47 +00:00

108 lines
2.4 KiB
Go

// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package git
import (
"bufio"
"bytes"
"io"
"strings"
)
// CommitFromReader will generate a Commit from a provided reader
// We need this to interpret commits from cat-file or cat-file --batch
//
// If used as part of a cat-file --batch stream you need to limit the reader to the correct size
func CommitFromReader(gitRepo *Repository, objectID ObjectID, reader io.Reader) (*Commit, error) {
commit := &Commit{
ID: objectID,
Author: &Signature{},
Committer: &Signature{},
}
payloadSB := new(strings.Builder)
signatureSB := new(strings.Builder)
messageSB := new(strings.Builder)
message := false
pgpsig := false
bufReader, ok := reader.(*bufio.Reader)
if !ok {
bufReader = bufio.NewReader(reader)
}
readLoop:
for {
line, err := bufReader.ReadBytes('\n')
if err != nil {
if err == io.EOF {
if message {
_, _ = messageSB.Write(line)
}
_, _ = payloadSB.Write(line)
break readLoop
}
return nil, err
}
if pgpsig {
if len(line) > 0 && line[0] == ' ' {
_, _ = signatureSB.Write(line[1:])
continue
} else {
pgpsig = false
}
}
if !message {
// This is probably not correct but is copied from go-gits interpretation...
trimmed := bytes.TrimSpace(line)
if len(trimmed) == 0 {
message = true
_, _ = payloadSB.Write(line)
continue
}
split := bytes.SplitN(trimmed, []byte{' '}, 2)
var data []byte
if len(split) > 1 {
data = split[1]
}
switch string(split[0]) {
case "tree":
commit.Tree = *NewTree(gitRepo, MustIDFromString(string(data)))
_, _ = payloadSB.Write(line)
case "parent":
commit.Parents = append(commit.Parents, MustIDFromString(string(data)))
_, _ = payloadSB.Write(line)
case "author":
commit.Author = &Signature{}
commit.Author.Decode(data)
_, _ = payloadSB.Write(line)
case "committer":
commit.Committer = &Signature{}
commit.Committer.Decode(data)
_, _ = payloadSB.Write(line)
case "gpgsig":
_, _ = signatureSB.Write(data)
_ = signatureSB.WriteByte('\n')
pgpsig = true
}
} else {
_, _ = messageSB.Write(line)
_, _ = payloadSB.Write(line)
}
}
commit.CommitMessage = messageSB.String()
commit.Signature = &CommitGPGSignature{
Signature: signatureSB.String(),
Payload: payloadSB.String(),
}
if len(commit.Signature.Signature) == 0 {
commit.Signature = nil
}
return commit, nil
}