function doPost(e) {
  let contents = {};
  try { contents = JSON.parse(e.postData.contents); } catch {}
  if (contents.message?.media_group_id || !contents.message?.text) {
    return;
  }

  const found = contents.message.text.match(/https?:\/\/(?:mobile\.)?twitter\.com\/(\w+)\/status\/(\d+)(\/photo\/\d)?/);
  if (found) {
    // Feel free to hardcode bot token, reducing PropertiesService usage quota
    UrlFetchApp.fetch(`https://api.telegram.org/bot${PropertiesService.getScriptProperties().getProperty('TELEGRAM_BOT_TOKEN')}/`, {
      method: "post",
      payload: {
        method: "sendMessage",
        chat_id: String(contents.message.chat.id),
        text: `https://fxtwitter.com/${found[1]}/status/${found[2]}${found[3] || ''}`,
        reply_to_message_id: String(contents.message.message_id),
        disable_notification: true,
      }
    });
  }
}

function doGet() {
  return HtmlService.createHtmlOutput('Webhook Endpoint for <a href="https://t.me/TangMo_fxtwitter_bot">@TangMo_fxtwitter_bot</a> Telegram bot');
}