cmd/receivepack9418: Init

1 files changed, 60 insertions, 0 deletions

diff --git a/cmd/receivepack9418/request.go b/cmd/receivepack9418/request.go
new file mode 100644
index 00000000..5e392926
--- /dev/null
+++ b/cmd/receivepack9418/request.go
@@ -0,0 +1,60 @@
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"strings"
+)
+
+type gitProtoRequest struct {
+	Command         string
+	Pathname        string
+	Host            string
+	ExtraParameters []string
+}
+
+func parseGitProtoRequestPayload(payload []byte) (gitProtoRequest, error) {
+	parts := bytes.Split(payload, []byte{0})
+	if len(parts) == 0 || len(parts[0]) == 0 {
+		return gitProtoRequest{}, errors.New("missing command/path segment")
+	}
+
+	commandPath := string(parts[0])
+	command, pathname, ok := strings.Cut(commandPath, " ")
+	if !ok || command == "" || pathname == "" {
+		return gitProtoRequest{}, fmt.Errorf("malformed command/path segment %q", commandPath)
+	}
+
+	req := gitProtoRequest{
+		Command:  command,
+		Pathname: pathname,
+	}
+
+	i := 1
+	if i < len(parts) && strings.HasPrefix(string(parts[i]), "host=") {
+		req.Host = strings.TrimPrefix(string(parts[i]), "host=")
+		i++
+	}
+
+	// No tail left.
+	if i >= len(parts) {
+		return req, nil
+	}
+
+	// If there is tail, grammar requires one empty field before extras.
+	if len(parts[i]) != 0 {
+		return gitProtoRequest{}, fmt.Errorf("unexpected token %q after host/path", string(parts[i]))
+	}
+
+	i++
+	for ; i < len(parts); i++ {
+		if len(parts[i]) == 0 {
+			continue
+		}
+
+		req.ExtraParameters = append(req.ExtraParameters, string(parts[i]))
+	}
+
+	return req, nil
+}