mail2discord.gs

function checkEmailsAndSendToDiscord() {
  impl("prod")
}

function dev() {
  impl("dev")
}

const YOUR_QUERY = "";

const configs = {
  prod: {
    discordWebhookUrl: 'your discord webhook URL',
    getThreads: () => GmailApp.search('is:unread ' + YOUR_QUERY),
  },
  dev: {
    discordWebhookUrl: 'your discord webhook URL',
    getThreads: () => GmailApp.getInboxThreads(),
  }
}

function impl(env) {
  const config = configs[env];
  if (!config) return;

  const discordWebhookUrl = config.discordWebhookUrl;

  const threads = config.getThreads();

  Logger.log("threads: "+(threads.length));

  let count = 0;

  for (const thread of threads) {
    // メールの本文を取得
    const messages = thread.getMessages();
    Logger.log("messages: "+(messages.length));
    
    for (const message of messages) {

      if (!message.isUnread()) continue;
      Logger.log(message.getSubject())

      const subject = message.getSubject();
      const body = message.getPlainBody();
      const timestamp = message.getDate();

      // メールの内容をDiscordに送信
      UrlFetchApp.fetch(discordWebhookUrl, {
        method: 'post',
        payload: JSON.stringify({
          content: ``,
          "embeds": [
            {
              "type": "rich",
              "title": subject,
              "description": body.slice(0, 1800),
              "color": 0x00FFFF,
              "timestamp": timestamp.toISOString(),
            }
          ]
        }),
        headers: {
          'Content-Type': 'application/json'
        }
      });

      count++;

      // メールを既読にする
      message.markRead();
    }
  }

  Logger.log("送信完了: " + count);
}