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package commit
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"gitlab.com/gitlab-org/gitaly/internal/git"
"gitlab.com/gitlab-org/gitaly/internal/git/catfile"
"gitlab.com/gitlab-org/gitaly/internal/helper"
"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
"gitlab.com/gitlab-org/gitaly/streamio"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var gpgSiganturePrefix = []byte("gpgsig")
func (s *server) GetCommitSignatures(request *gitalypb.GetCommitSignaturesRequest, stream gitalypb.CommitService_GetCommitSignaturesServer) error {
if err := validateGetCommitSignaturesRequest(request); err != nil {
return status.Errorf(codes.InvalidArgument, "GetCommitSignatures: %v", err)
}
return getCommitSignatures(s, request, stream)
}
func getCommitSignatures(s *server, request *gitalypb.GetCommitSignaturesRequest, stream gitalypb.CommitService_GetCommitSignaturesServer) error {
ctx := stream.Context()
c, err := catfile.New(ctx, request.GetRepository())
if err != nil {
return helper.ErrInternal(err)
}
for _, commitID := range request.CommitIds {
commitObj, err := c.Commit(ctx, commitID)
if err != nil {
if catfile.IsNotFound(err) {
continue
}
return helper.ErrInternal(err)
}
signatureKey, commitText, err := extractSignature(commitObj.Reader)
if err != nil {
return helper.ErrInternal(err)
}
if err = sendResponse(commitID, signatureKey, commitText, stream); err != nil {
return helper.ErrInternal(err)
}
}
return nil
}
func extractSignature(reader io.Reader) ([]byte, []byte, error) {
commitText := []byte{}
signatureKey := []byte{}
sawSignature := false
inSignature := false
lineBreak := []byte("\n")
whiteSpace := []byte(" ")
bufferedReader := bufio.NewReader(reader)
for {
line, err := bufferedReader.ReadBytes('\n')
if err == io.EOF {
commitText = append(commitText, line...)
break
}
if err != nil {
return nil, nil, err
}
if !sawSignature && !inSignature && bytes.HasPrefix(line, gpgSiganturePrefix) {
sawSignature, inSignature = true, true
line = bytes.TrimPrefix(line, gpgSiganturePrefix)
}
if inSignature && !bytes.Equal(line, lineBreak) {
line = bytes.TrimPrefix(line, whiteSpace)
signatureKey = append(signatureKey, line...)
} else if inSignature {
inSignature = false
commitText = append(commitText, line...)
} else {
commitText = append(commitText, line...)
}
}
// Remove last line break from signature
signatureKey = bytes.TrimSuffix(signatureKey, lineBreak)
return signatureKey, commitText, nil
}
func sendResponse(commitID string, signatureKey []byte, commitText []byte, stream gitalypb.CommitService_GetCommitSignaturesServer) error {
if len(signatureKey) <= 0 {
return nil
}
err := stream.Send(&gitalypb.GetCommitSignaturesResponse{
CommitId: commitID,
Signature: signatureKey,
})
if err != nil {
return err
}
streamWriter := streamio.NewWriter(func(p []byte) error {
return stream.Send(&gitalypb.GetCommitSignaturesResponse{SignedText: p})
})
msgReader := bytes.NewReader(commitText)
_, err = io.Copy(streamWriter, msgReader)
if err != nil {
return fmt.Errorf("failed to send response: %v", err)
}
return nil
}
func validateGetCommitSignaturesRequest(request *gitalypb.GetCommitSignaturesRequest) error {
if request.GetRepository() == nil {
return errors.New("empty Repository")
}
if len(request.GetCommitIds()) == 0 {
return errors.New("empty CommitIds")
}
// Do not support shorthand or invalid commit SHAs
for _, commitID := range request.CommitIds {
if err := git.ValidateCommitID(commitID); err != nil {
return err
}
}
return nil
}
|
