Sends an email every time an issue is created or commented on using script.google.com and a GitHub Webhook

gitHubMail.js

var secretToken = 'SECRET';
var sendTo = 'nodejs@googlegroups.com';
var org = 'node-forward';
var repo = 'help';
var prefix = '[' + org + '-' + repo + ']';
var rx = new RegExp('\\[(' + org + ')-(' + repo + ')\\][\\s\\S]+\\(#(\\d+)', 'i');

// recieving issue/comments from GitHub
function doPost(e) {
  return toMailingList(e, JSON.parse(e.postData.getDataAsString()));
}

function toMailingList(e, ps) {
  if (e.parameter.token !== secretToken) {
    return rtn({ status: '400', message: 'Invalid token' });
  } else if (ps.repository['full_name'] !== org + '/' + repo) {
    return rtn({ status: '400', message: 'Invalid repository: ' + ps.repository['full_name'] });
  }
  
  var src = ps.comment || ps.issue;
  var subject = prefix + ' ' + ps.issue.title + ' (#' + ps.issue.number + ' ' + ps.issue.state + ')';
  var body = getMsg(src.user.login, src.body);

  GmailApp.sendEmail(sendTo, subject, body, {
    name: org + '/' + repo,
    htmlBody: body,
    replyTo: org + '@gmail.com'
  });

  return rtn({ status: '200', message: 'sent' });
}

function rtn(json) {
  //ContentService.createTextOutput(JSON.stringify(json)).setMimeType(ContentService.MimeType.JSON);
  return HtmlService.createHtmlOutput(JSON.stringify(json));
}

function getMsg(user, body) {
  return '<b>' + user + '</b> <em>says</em>:<br/>' + body;
}

// uncomment setupTrig and add github api oauth to recieve responses from mailing list and add them as a comment
// setupTrig();
function setupTrig() {
  // would be nice to use trigger https://code.google.com/p/google-apps-script-issues/issues/detail?id=636
  var ts = ScriptApp.getProjectTriggers();
  for (var i = 0; i < ts.length; i++) {
    if (ts[i].getEventType() == ScriptApp.EventType.CLOCK) {
      return ts[i];
    }
  }
  // scan the inbox for new issue comments
  return ScriptApp.newTrigger('toGitHubIssue').timeBased().everyHours(3).create();
}

function toGitHubIssue() {
  // authenticate using https://developer.github.com/v3/oauth/#non-web-application-flow
  // and https://developers.google.com/apps-script/reference/url-fetch/url-fetch-app#addOAuthService(String)
  var ts = GmailApp.search('is:unread subject:' + prefix);
  for (var i = 0, il = ts.length, m; i < il; i++) {
    for (var j = 0, jl = ts[i].length; j < jl; j++) {
      if ((m = ts[i][j].getSubject().match(rx)) && m[3]) {
        UrlFetchApp.fetch('https://api.github.com/repos/' + org + '/' + repo + '/issues/' + m[3] + '/comments', {
                          method: 'post',
                          payload: getMsg(ts[i][j].getFrom(), ts[i][j].getRawContent())
        });
        ts[i][j].markRead();
      }
    }
  }
}