OriginalContentURL & PreviewImageURL is Empty when receiving Image Message

[hualoqueros]

System Informations

• Go version: 1.13
• OS: Linux

Expected Behavior

OriginalContentURL and PreviewImageURL is not Empty

Current Behavior

Base on Image Message documentation : https://developers.line.biz/en/reference/messaging-api/#wh-image
the payload is :

{
  "destination": "xxxxxxxxxx",
  "events": [
    {
      "replyToken": "nHuyWiB7yP5Zw52FIkcQobQuGDXCTA",
      "type": "message",
      "mode": "active",
      "timestamp": 1462629479859,
      "source": {
        "type": "user",
        "userId": "U4af4980629..."
      },
      "message": {
        "id": "325708",
        "type": "image",
        "contentProvider": {
          "type": "line"
        }
      }
    }
  ]
}

But i thing on this line code below in message.go file is not updated (hope i was wrong) for the image message payload (notice on contentProvider on payload example above)

...
// ImageMessage type
type ImageMessage struct {
	ID                 string
	OriginalContentURL string
	PreviewImageURL    string

	quickReplyitems *QuickReplyItems
	sender          *Sender
}

// MarshalJSON method of ImageMessage
func (m *ImageMessage) MarshalJSON() ([]byte, error) {
	return json.Marshal(&struct {
		Type               MessageType      `json:"type"`
		OriginalContentURL string           `json:"originalContentUrl"`
		PreviewImageURL    string           `json:"previewImageUrl"`
		QuickReply         *QuickReplyItems `json:"quickReply,omitempty"`
		Sender             *Sender          `json:"sender,omitempty"`
	}{
		Type:               MessageTypeImage,
		OriginalContentURL: m.OriginalContentURL,
		PreviewImageURL:    m.PreviewImageURL,
		QuickReply:         m.quickReplyitems,
		Sender:             m.sender,
	})
}
...

Steps to Reproduce

Logs

this is the log of *linebot.ImageMessage

&{ID:12888876884078 OriginalContentURL: PreviewImageURL: quickReplyitems:<nil> sender:<nil>}

[clsung]

contentProvider.originalContentUrl and contentProvider.previewImageUrl are only included when contentProvider.type is external.

[tokuhirom]

I'll close this issue because @clsung already answered this question.

Note: https://developers.line.biz/en/reference/messaging-api/#wh-image