Initial QSfera import

Server/pkg/x/path/filepathx/path.go

@@ -0,0 +1,12 @@
+package filepathx
+
+import (
+	"path/filepath"
+)
+
+// JailJoin joins any number of path elements into a single path,
+// it protects against directory traversal by removing any "../" elements
+// and ensuring that the path is always under the jail.
+func JailJoin(jail string, elem ...string) string {
+	return filepath.Join(jail, filepath.Join(append([]string{"/"}, elem...)...))
+}