Google Forms経由で匿名でSlackに投稿するGoogle Apps Script

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/*
 Google Forms経由で匿名でSlackに投稿するGoogle Apps Script
*/
var config = {
  slack: {
    token: 'xoxp-XXXXXXXXXXX-XXXXXXXXX...',
    iconEmoji: ':mona:',
  },
  channel: '#channel',
};

function formPost(e) {
  try {
    var res = e.response.getItemResponses();
    var name = res[0].getResponse();
    var text = res[1].getResponse();
    var isFujiwara = res[2] !== undefined;
    if (isFujiwara) {
      if (name === undefined || name === '') name = '名無しの藤原竜也さん';
      text = fujiwarify(text);
    } else {
      if (name === undefined || name === '') name = '名無しの大二郎さん';
    }
    postFileToSlack(config.channel, makeHandle(name), text);
    e.source.deleteAllResponses();
  } catch (e) {
    Loggerr.log(e);
  }
}
function stringToArray (str) {
  // from https://qiita.com/YusukeHirao/items/2f0fb8d5bbb981101be0
  return str.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]|[^\uD800-\uDFFF]/g) || [];
}

function fujiwarify(s) {
  s = s.replace(/(ください|下さい|ます|です|たい|う|た|よ)([。！!]|$)/g, function (s, a, b) {
    if (a === 'よ') {
      return a + 'ぉぉぉぉ' + b;
    } else {
      return a + 'よぉぉぉぉ' + b;
    }
  });
  var chars = stringToArray(s);
  var result = '';
  chars.forEach(function (c) {
    result += c + '゛';
  });
  return result;
}

function makeHandle (nickname) {
  return nickname.replace(/◆/g, '◇')
    .replace(/(#[\x20-\x7e]{1,8})$/, function (s, a) {
      var salt = 'long long text here.'
      var sha1 = Utilities.computeDigest(Utilities.DigestAlgorithm.SHA_1, salt + a);
      var sha1text = Utilities.base64Encode(sha1);
      return '◆' + sha1text.substr(0,10);
    });
}

function postFileToSlack(channel, botName, title, content) {
  var escape = function(s){
    if (s === undefined || s === null) s = "";
    return s.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
  };
  var url = 'https://slack.com/api/chat.postMessage';
  var payload = {
    token :  config.slack.token,
    channel : channel,
    text: title,
    username : botName,
    attachments: [{
      text: '```' + content + '```',
      mrkdwn_in: 'text'
    }],
    icon_emoji: config.slack.iconEmoji
  };
  if( payload.channel.charAt(0) !== "#" && payload.channel.charAt(0) !== "@" ) payload.channel = "#" + payload.channel;
  
  if (content === undefined) delete payload.attachments;
  else payload.attachments = JSON.stringify(payload.attachments);
  var res = UrlFetchApp.fetch(url, { method : 'post', payload : payload });
  if (res.getResponseCode() === 200) {
    var json = JSON.parse(res.getContentText());
    if (json.ok === true) {
      return true;
    } else {
      Logger.log(json);
      return false;
    }
  } else {
    Logger.log('Status=' + res.getResponseCode());
  }
}