feat: add tts with go-piper (#649)

Signed-off-by: mudler <mudler@localai.io>

pkg/utils/path.go

@@ -0,0 +1,22 @@
+package utils
+
+import (
+	"fmt"
+	"path/filepath"
+)
+
+func inTrustedRoot(path string, trustedRoot string) error {
+	for path != "/" {
+		path = filepath.Dir(path)
+		if path == trustedRoot {
+			return nil
+		}
+	}
+	return fmt.Errorf("path is outside of trusted root")
+}
+
+// VerifyPath verifies that path is based in basePath.
+func VerifyPath(path, basePath string) error {
+	c := filepath.Clean(filepath.Join(basePath, path))
+	return inTrustedRoot(c, basePath)
+}