plumbing: transport: use git-proto-request and decode error-line errors

2 files changed, 106 insertions, 2 deletions

diff --git a/plumbing/protocol/packp/gitproto.go b/plumbing/protocol/packp/gitproto.go
index 806e44c..0b7ff8f 100644
--- a/plumbing/protocol/packp/gitproto.go
+++ b/plumbing/protocol/packp/gitproto.go
@@ -76,7 +76,11 @@ func (g *GitProtoRequest) Encode(w io.Writer) error {
 func (g *GitProtoRequest) Decode(r io.Reader) error {
 	s := pktline.NewScanner(r)
 	if !s.Scan() {
-		return s.Err()
+		err := s.Err()
+		if err == nil {
+			return ErrInvalidGitProtoRequest
+		}
+		return err
 	}
 
 	line := string(s.Bytes())
@@ -99,8 +103,9 @@ func (g *GitProtoRequest) Decode(r io.Reader) error {
 		return fmt.Errorf("%w: missing pathname", ErrInvalidGitProtoRequest)
 	}
 
+	g.Pathname = params[0]
 	if len(params) > 1 {
-		g.Host = params[1]
+		g.Host = strings.TrimPrefix(params[1], "host=")
 	}
 
 	if len(params) > 2 {
diff --git a/plumbing/protocol/packp/gitproto_test.go b/plumbing/protocol/packp/gitproto_test.go
new file mode 100644
index 0000000..9cf1049
--- /dev/null
+++ b/plumbing/protocol/packp/gitproto_test.go
@@ -0,0 +1,99 @@
+package packp
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestEncodeEmptyGitProtoRequest(t *testing.T) {
+	var buf bytes.Buffer
+	var p GitProtoRequest
+	err := p.Encode(&buf)
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}
+
+func TestEncodeGitProtoRequest(t *testing.T) {
+	var buf bytes.Buffer
+	p := GitProtoRequest{
+		RequestCommand: "command",
+		Pathname:       "pathname",
+		Host:           "host",
+		ExtraParams:    []string{"param1", "param2"},
+	}
+	err := p.Encode(&buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+	expected := "002ecommand pathname\x00host=host\x00\x00param1\x00param2\x00"
+	if buf.String() != expected {
+		t.Fatalf("expected %q, got %q", expected, buf.String())
+	}
+}
+
+func TestEncodeInvalidGitProtoRequest(t *testing.T) {
+	var buf bytes.Buffer
+	p := GitProtoRequest{
+		RequestCommand: "command",
+	}
+	err := p.Encode(&buf)
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}
+
+func TestDecodeEmptyGitProtoRequest(t *testing.T) {
+	var buf bytes.Buffer
+	var p GitProtoRequest
+	err := p.Decode(&buf)
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}
+
+func TestDecodeGitProtoRequest(t *testing.T) {
+	var buf bytes.Buffer
+	buf.WriteString("002ecommand pathname\x00host=host\x00\x00param1\x00param2\x00")
+	var p GitProtoRequest
+	err := p.Decode(&buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+	expected := GitProtoRequest{
+		RequestCommand: "command",
+		Pathname:       "pathname",
+		Host:           "host",
+		ExtraParams:    []string{"param1", "param2"},
+	}
+	if p.RequestCommand != expected.RequestCommand {
+		t.Fatalf("expected %q, got %q", expected.RequestCommand, p.RequestCommand)
+	}
+	if p.Pathname != expected.Pathname {
+		t.Fatalf("expected %q, got %q", expected.Pathname, p.Pathname)
+	}
+	if p.Host != expected.Host {
+		t.Fatalf("expected %q, got %q", expected.Host, p.Host)
+	}
+	if len(p.ExtraParams) != len(expected.ExtraParams) {
+		t.Fatalf("expected %d, got %d", len(expected.ExtraParams), len(p.ExtraParams))
+	}
+}
+
+func TestDecodeInvalidGitProtoRequest(t *testing.T) {
+	var buf bytes.Buffer
+	buf.WriteString("0026command \x00host=host\x00\x00param1\x00param2")
+	var p GitProtoRequest
+	err := p.Decode(&buf)
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}
+
+func TestValidateEmptyGitProtoRequest(t *testing.T) {
+	var p GitProtoRequest
+	err := p.validate()
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}