google-tts-api/lib/key.js

Google TTS (Text-To-Speech) for node.js

var fetch = require('isomorphic-fetch');
var host = 'https://translate.google.com';

/**
 * Get Key from https://translate.google.com
 *
 * @param   {Number!} timeout  default is 10000ms
 * @return  Promise(key: String)
 */
module.exports = function (timeout) {
  return fetch(host, {
    timeout: timeout || 10 * 1000
  })
  .then(function (res) {
    if (res.status !== 200) {
      throw new Error('request to ' + host + ' failed, status code = ' + res.status + ' (' + res.statusText + ')');
    }
    return res.text();
  })
  .then(function (html) {
    const expressions = [
      "TKK='(\\d+.\\d+)';",
      "tkk:'(\\d+.\\d+)'"
    ];

    const matches = expressions
      .map(expr => html.match(expr))
      .filter(res => res);

    if (!matches.length) throw new Error('get key failed from google');

    return matches[0][1];
  });
};