index.js

const fetch = require('node-fetch');
const yaleAuthToken = 'VnVWWDZYVjlXSUNzVHJhcUVpdVNCUHBwZ3ZPakxUeXNsRU1LUHBjdTpkd3RPbE15WEtENUJ5ZW1GWHV0am55eGhrc0U3V0ZFY2p0dFcyOXRaSWNuWHlSWHFsWVBEZ1BSZE1xczF4R3VwVTlxa1o4UE5ubGlQanY5Z2hBZFFtMHpsM0h4V3dlS0ZBcGZzakpMcW1GMm1HR1lXRlpad01MRkw3MGR0bmNndQ==';
var refresh_token = '';
var access_token = '';

const urls = {
  auth: 'https://mob.yalehomesystem.co.uk/yapi/o/token/',
  getStatus: 'https://mob.yalehomesystem.co.uk/yapi/api/panel/mode/',
  setStatus: 'https://mob.yalehomesystem.co.uk/yapi/api/panel/mode/',
  services: 'https://mob.yalehomesystem.co.uk/yapi/services/'
};

function getAccessToken(username, password) {
  payload = `grant_type=password&username=${encodeURIComponent(username)}&password=${encodeURIComponent(password)}`;
  return fetch(urls.auth, {
    method: 'POST',
    body: payload,
    headers: {
      "Authorization": "Basic " + yaleAuthToken,
      'Accept': 'application/json, application/xml, text/plain, text/html, *.*',
      'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
    }
  })

    .then(res => res.json())
    .then(json => {
      if (json.error === 'invalid_grant') {
        return Promise.reject(json.error_description);
      }
      else {
        fetch(urls.services, {
          method: 'GET',
          headers: {
            "Authorization": "Bearer " + access_token,
            'Accept': 'application/json, application/xml, text/plain, text/html, *.*',
            'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
          }
        });
        return json.access_token;
      };
    });

}

function setStatus (access_token, alarmstate) {
    return new Promise((resolve, reject) => {
        if (!access_token || access_token.length === 0) {
            reject('Please call getAccessToken to get your access token first');
        }

        if (alarmstate !== 'arm' && alarmstate !== 'home' && alarmstate !== 'disarm') {
            reject('Invalid mode passed to setStatus');
        }

        return fetch(urls.setStatus, {
          method: 'POST',
          body: `area=1&mode=${alarmstate}`,
          headers: {
            "Authorization": "Bearer " + access_token,
            'Accept': 'application/json, application/xml, text/plain, text/html, *.*',
            'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
          }
        }).then(res => res.json())
    .then(json => {
      setStatus = json.data.cmd_ack;
      resolve(setStatus);
    })
    });
}

function getStatus (access_token) {
    return new Promise((resolve, reject) => {
        if (!access_token || access_token.length === 0) {
            reject('Please call getAccessToken to get your access token first');
        };

        return fetch(urls.getStatus, {
          method: 'GET',
          headers: {
            "Authorization": "Bearer " + access_token,
            'Accept': 'application/json, application/xml, text/plain, text/html, *.*',
            'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
          }
        })
        .then(res => res.json())
        .then(json => {
            alarmState = json.data[0].mode;
            resolve(alarmState);
          })
      })
}

module.exports = {
    getAccessToken,
    getStatus,
    setStatus,
}