Implement route rules

constant/path.go

@@ -0,0 +1,35 @@
+package constant
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/sagernet/sing/common/rw"
+)
+
+const dirName = "sing-box"
+
+var resourcePaths []string
+
+func Find(name string) (string, bool) {
+	name = os.ExpandEnv(name)
+	if rw.FileExists(name) {
+		return name, true
+	}
+	for _, dir := range resourcePaths {
+		if path := filepath.Join(dir, dirName, name); rw.FileExists(path) {
+			return path, true
+		}
+	}
+	return name, false
+}
+
+func init() {
+	resourcePaths = append(resourcePaths, ".")
+	if userConfigDir, err := os.UserConfigDir(); err == nil {
+		resourcePaths = append(resourcePaths, userConfigDir)
+	}
+	if userCacheDir, err := os.UserCacheDir(); err == nil {
+		resourcePaths = append(resourcePaths, userCacheDir)
+	}
+}

constant/path_unix.go

@@ -0,0 +1,17 @@
+//go:build unix
+
+package constant
+
+import (
+	"os"
+)
+
+func init() {
+	resourcePaths = append(resourcePaths, "/etc/config")
+	resourcePaths = append(resourcePaths, "/usr/share")
+	resourcePaths = append(resourcePaths, "/usr/local/etc/config")
+	resourcePaths = append(resourcePaths, "/usr/local/share")
+	if homeDir := os.Getenv("HOME"); homeDir != "" {
+		resourcePaths = append(resourcePaths, homeDir+"/.local/share")
+	}
+}

constant/require.go

@@ -0,0 +1,7 @@
+//go:build !go1.19
+
+package constant
+
+func init() {
+	panic("sing-box requires Go 1.19 or later")
+}

constant/rule.go

@@ -4,3 +4,8 @@ const (
 	RuleTypeDefault = "default"
 	RuleTypeLogical = "logical"
 )
+
+const (
+	LogicalTypeAnd = "and"
+	LogicalTypeOr  = "or"
+)