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package packp
import (
"fmt"
"io"
"strings"
"github.com/go-git/go-git/v5/plumbing/format/pktline"
)
var (
// ErrInvalidGitProtoRequest is returned by Decode if the input is not a
// valid git protocol request.
ErrInvalidGitProtoRequest = fmt.Errorf("invalid git protocol request")
)
// GitProtoRequest is a command request for the git protocol.
// It is used to send the command, endpoint, and extra parameters to the
// remote.
// See https://git-scm.com/docs/pack-protocol#_git_transport
type GitProtoRequest struct {
RequestCommand string
Pathname string
// Optional
Host string
// Optional
ExtraParams []string
}
// validate validates the request.
func (g *GitProtoRequest) validate() error {
if g.RequestCommand == "" {
return fmt.Errorf("%w: empty request command", ErrInvalidGitProtoRequest)
}
if g.Pathname == "" {
return fmt.Errorf("%w: empty pathname", ErrInvalidGitProtoRequest)
}
return nil
}
// Encode encodes the request into the writer.
func (g *GitProtoRequest) Encode(w io.Writer) error {
if w == nil {
return ErrNilWriter
}
if err := g.validate(); err != nil {
return err
}
p := pktline.NewEncoder(w)
req := fmt.Sprintf("%s %s\x00", g.RequestCommand, g.Pathname)
if host := g.Host; host != "" {
req += fmt.Sprintf("host=%s\x00", host)
}
if len(g.ExtraParams) > 0 {
req += "\x00"
for _, param := range g.ExtraParams {
req += param + "\x00"
}
}
if err := p.Encode([]byte(req)); err != nil {
return err
}
return nil
}
// Decode decodes the request from the reader.
func (g *GitProtoRequest) Decode(r io.Reader) error {
s := pktline.NewScanner(r)
if !s.Scan() {
err := s.Err()
if err == nil {
return ErrInvalidGitProtoRequest
}
return err
}
line := string(s.Bytes())
if len(line) == 0 {
return io.EOF
}
if line[len(line)-1] != 0 {
return fmt.Errorf("%w: missing null terminator", ErrInvalidGitProtoRequest)
}
parts := strings.SplitN(line, " ", 2)
if len(parts) != 2 {
return fmt.Errorf("%w: short request", ErrInvalidGitProtoRequest)
}
g.RequestCommand = parts[0]
params := strings.Split(parts[1], string(null))
if len(params) < 1 {
return fmt.Errorf("%w: missing pathname", ErrInvalidGitProtoRequest)
}
g.Pathname = params[0]
if len(params) > 1 {
g.Host = strings.TrimPrefix(params[1], "host=")
}
if len(params) > 2 {
for _, param := range params[2:] {
if param != "" {
g.ExtraParams = append(g.ExtraParams, param)
}
}
}
return nil
}
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