GAS Webアプリ: POSTリクエストで受け取ったEメールデータをGmailで送り付けるスクリプト

gas-webapp-email-forwarder.gs

/**
 * GAS Webアプリ
 * POSTリクエストで受け取ったEメールデータをGmailで送り付けるスクリプト
 * 
 * 使用例:
 *   curl -L https://script.google.com/macros/s/[デプロイID]/exec -F "to=foo@example.com" -F "subject=はろー" -F "body=はろー"
 * 
 * レスポンス例:
 *   {"status":"success","body":"正常にメールを送信しました"}
 *
 * * * * 
 *
 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 * Version 2, December 2004
 * 
 * Copyright (C) 2023 YAMIMAKI, Reru
 *
 * Everyone is permitted to copy and distribute verbatim or modified
 * copies of this license document, and changing it is allowed as long
 * as the name is changed.
 *
 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 * TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 *
 * 0. You just DO WHAT THE FUCK YOU WANT TO.
 */

function doPost(evt) {
  try {
    const recipient = evt.parameter.to;
    const subject = evt.parameter.subject;
    const body = evt.parameter.body;
    GmailApp.sendEmail(recipient, subject, body);
    return returnAsJson('success', '正常にEメールを送信しました');
  } catch(ex) {
    return returnAsJson('failure',
        `${ex.name}: ${ex.message}\n${ex.stack}`);
  }
}

function returnAsJson(status, body) {
  return ContentService.createTextOutput(
      JSON.stringify({status, body}));
}