Send Google Chat With Image

sendChatWithImage.gs

function sendChatWithImage() {
  // Library ID:  1T03nYHRho6XMWYcaumClcWr6ble65mAT8OLJqRFJ5lukPVogAN2NDl-y
  const imageID = "YOUR_IMAGE_ID_GOOGLE_DRIVE"; // Image ID (Google Drive)
  const webhookUrl = 'YOUR_GROUP_CHAT_WEBHOOK_URL';
  const resizedImageHeight = 400; // 400px or smaller
  const res = ImgApp.doResize(imageID, resizedImageHeight);
  const base64 = Utilities.base64Encode(res.blob.getBytes());
  const mimeType = res.blob.getContentType();
  const dataUrl = `data:${mimeType};base64,${base64}`;

  UrlFetchApp.fetch(webhookUrl, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    payload: JSON.stringify({
      cardsV2: [
        {
          cardId: "test",
          card: {
            header: {
              title: "Test gửi hình ảnh"
            },
            "sections": [
              {
                "header": "Vui lòng bỏ qua tin nhắn này",
                "widgets": [
                  {
                    "image": {
                      "imageUrl": dataUrl
                    }
                  },
                ]
              }
            ]
          }
        }
      ]
    })
  })
}