Use runtime-dir Unix sockets for local gRPC

internal/grpcaddr/addr.go

@@ -0,0 +1,66 @@
+package grpcaddr
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+const socketName = "keepassgo-grpc.sock"
+
+func Default(goos string) string {
+	if strings.EqualFold(strings.TrimSpace(goos), "android") {
+		return "off"
+	}
+	if strings.EqualFold(strings.TrimSpace(goos), "windows") {
+		return "127.0.0.1:47777"
+	}
+	return "unix://" + DefaultSocketPath()
+}
+
+func DefaultSocketPath() string {
+	return filepath.Join(runtimeDir(), "keepassgo", socketName)
+}
+
+func runtimeDir() string {
+	if dir := strings.TrimSpace(os.Getenv("XDG_RUNTIME_DIR")); dir != "" {
+		return dir
+	}
+	if runtime.GOOS != "windows" {
+		uid := strconv.Itoa(os.Getuid())
+		runUserDir := filepath.Join("/run/user", uid)
+		if info, err := os.Stat(runUserDir); err == nil && info.IsDir() {
+			return runUserDir
+		}
+	}
+	return filepath.Join(os.TempDir(), fmt.Sprintf("keepassgo-runtime-%d", os.Getuid()))
+}
+
+func Parse(raw string) (network, endpoint string, err error) {
+	value := strings.TrimSpace(raw)
+	switch {
+	case value == "":
+		return "", "", fmt.Errorf("gRPC address is required")
+	case strings.EqualFold(value, "off"):
+		return "", "", nil
+	case strings.HasPrefix(value, "unix://"):
+		path := strings.TrimSpace(strings.TrimPrefix(value, "unix://"))
+		if path == "" {
+			return "", "", fmt.Errorf("unix gRPC socket path is required")
+		}
+		return "unix", path, nil
+	case strings.HasPrefix(value, "tcp://"):
+		addr := strings.TrimSpace(strings.TrimPrefix(value, "tcp://"))
+		if addr == "" {
+			return "", "", fmt.Errorf("tcp gRPC address is required")
+		}
+		return "tcp", addr, nil
+	case strings.HasPrefix(value, "/"):
+		return "unix", value, nil
+	default:
+		return "tcp", value, nil
+	}
+}