Slack bot who react some words and return a giphy.

CorgiBot.js

var SLACK_ACCESS_TOKEN = PropertiesService.getScriptProperties().getProperty('SLACK_ACCESS_TOKEN');
var GIPHY_API_KEY = PropertiesService.getScriptProperties().getProperty('GIPHY_API_KEY');
// var SPREAD_SHEET_ID = PropertiesService.getScriptProperties().getProperty('SPREAD_SHEAT_ID');

var POST_MESSAGE_ENDPOINT = 'https://slack.com/api/chat.postMessage';
var TEXTS = [
  'Do you like dogs?:dog:',
  'You said the word!:grinning:',
  'I hope you like this...:poodle:',
  'Dogs are cute!:dog2: Dogs are cute!:dog2:',
  'I know, you want this.:thumbsup:'
];


function doPost(e){
  return ContentService.createTextOutput(JSON.parse(e.postData.contents).challenge);
  var event = JSON.parse(e.postData.contents).event;
  // log('POST event: ' + JSON.stringify(event));
  
  if(event.hasOwnProperty('bot_id')){
    return;
  }else if(event.text.match(/dog/)){
    postGiphy2Slack(event, ['cute', 'corgi', 'dog']);
  }else if(event.text.match(/corgi/)){
    postGiphy2Slack(event, ['cute', 'corgi']);
  }else if(event.text.match(/butt/)){
    postGiphy2Slack(event, ['cute', 'corgi', 'butt']);
  }else if(event.text.match(/shake/)){
    postGiphy2Slack(event, ['cute', 'corgi', 'shake']);
  }else if(event.text.match(/shiba/)){
    postGiphy2Slack(event, ['cute', 'shiba']);
  }
}


function postGiphy2Slack(event, keywords){
  var url = getGiphyUrl(keywords);
  var random_params = Math.floor(Math.random() * TEXTS.length);
  var payload = {token:SLACK_ACCESS_TOKEN, channel:event.channel, text:TEXTS[random_params] + '\n' + url};
  UrlFetchApp.fetch(POST_MESSAGE_ENDPOINT, {method: 'post', payload:payload});
}


function getGiphyUrl(keywords){
  var url = 'http://api.giphy.com/v1/gifs/search?q=' + keywords.join('%20') + '&api_key=' + GIPHY_API_KEY;
  var response = JSON.parse(UrlFetchApp.fetch(url));
  var random_params = Math.floor(Math.random() * response["data"].length);
  return response["data"][random_params]["bitly_gif_url"];
}


// function log(text){
//   var sheet = SpreadsheetApp.openById(SPREAD_SHEET_ID).getSheetByName('Sheet1');
//   sheet.appendRow([new Date(), text]);
// }