chore: Something update from clash :) (#606)

constant/path.go

@@ -56,6 +56,18 @@ func (p *path) Resolve(path string) string {
 	return path
 }
 
+// IsSubPath return true if path is a subpath of homedir
+func (p *path) IsSubPath(path string) bool {
+	homedir := p.HomeDir()
+	path = p.Resolve(path)
+	rel, err := filepath.Rel(homedir, path)
+	if err != nil {
+		return false
+	}
+
+	return !strings.Contains(rel, "..")
+}
+
 func (p *path) MMDB() string {
 	files, err := os.ReadDir(p.homeDir)
 	if err != nil {