Use CleanPath instead of path.Clean (#23371)

As title.

modules/util/path.go

@@ -14,6 +14,14 @@ import (
 	"strings"
 )
 
+// CleanPath ensure to clean the path
+func CleanPath(p string) string {
+	if strings.HasPrefix(p, "/") {
+		return path.Clean(p)
+	}
+	return path.Clean("/" + p)[1:]
+}
+
 // EnsureAbsolutePath ensure that a path is absolute, making it
 // relative to absoluteBase if necessary
 func EnsureAbsolutePath(path, absoluteBase string) string {

modules/util/path_test.go

@@ -136,3 +136,15 @@ func TestMisc_IsReadmeFileName(t *testing.T) {
 		assert.Equal(t, testCase.idx, idx)
 	}
 }
+
+func TestCleanPath(t *testing.T) {
+	cases := map[string]string{
+		"../../test": "test",
+		"/test":      "/test",
+		"/../test":   "/test",
+	}
+
+	for k, v := range cases {
+		assert.Equal(t, v, CleanPath(k))
+	}
+}