util: adds TraverseJSON

go.mod

@@ -37,6 +37,7 @@ require (
 	github.com/quic-go/qpack v0.5.1 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.1 // indirect
+	github.com/titanous/json5 v1.0.0
 	github.com/u2takey/go-utils v0.3.1 // indirect
 	github.com/unki2aut/go-mpd v0.0.0-20250218132413-c6a2d2d492f4
 	go.uber.org/mock v0.5.0 // indirect

go.sum

@@ -93,6 +93,8 @@ github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JT
 github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
 github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
 github.com/tidwall/pretty v1.2.1/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/titanous/json5 v1.0.0 h1:hJf8Su1d9NuI/ffpxgxQfxh/UiBFZX7bMPid0rIL/7s=
+github.com/titanous/json5 v1.0.0/go.mod h1:7JH1M8/LHKc6cyP5o5g3CSaRj+mBrIimTxzpvmckH8c=
 github.com/u2takey/ffmpeg-go v0.5.0 h1:r7d86XuL7uLWJ5mzSeQ03uvjfIhiJYvsRAJFCW4uklU=
 github.com/u2takey/ffmpeg-go v0.5.0/go.mod h1:ruZWkvC1FEiUNjmROowOAps3ZcWxEiOpFoHCvk97kGc=
 github.com/u2takey/go-utils v0.3.1 h1:TaQTgmEZZeDHQFYfd+AdUT1cT4QJgJn/XVPELhHw4ys=

util/traverse.go

@@ -0,0 +1,49 @@
+package util
+
+func TraverseJSON(
+	data interface{},
+	keys interface{},
+) interface{} {
+	var keySlice []string
+	switch k := keys.(type) {
+	case string:
+		keySlice = []string{k}
+	case []string:
+		keySlice = k
+	default:
+		return nil // unsupported keys type
+	}
+
+	return traverseObject(data, keySlice)
+}
+
+func traverseObject(data interface{}, keys []string) interface{} {
+	if len(keys) == 0 {
+		return data
+	}
+
+	key := keys[0]
+	remainingKeys := keys[1:]
+
+	switch d := data.(type) {
+	case map[string]interface{}:
+		if value, exists := d[key]; exists {
+			return traverseObject(value, remainingKeys)
+		}
+
+		for _, value := range d {
+			result := traverseObject(value, keys)
+			if result != nil {
+				return result
+			}
+		}
+	case []interface{}:
+		for _, item := range d {
+			result := traverseObject(item, keys)
+			if result != nil {
+				return result
+			}
+		}
+	}
+	return nil
+}