Player Token Request

var sha256 = require('sha256'),
    config = require('config');

function serialize(params, delimiter) {
  return Object.keys(params).sort()
  .map(function (key) {
    return key + '=' + (params[key] !== void 0 ? params[key] : options[key]);
  }).join(delimiter);
}

function getPcode(apiKey) {
  var idx = apiKey.lastIndexOf('.');
  if (idx === -1) {
    return '';
  }
  return apiKey.substring(0, idx);
}

exports.getPlayerTokenRequest = function(embedCode, accountId) {

  //console.log('getPlayerTokenRequest(embedCode="' + embedCode + '", accountId="' + accountId + '")');

  var apiKey = config.apiKey,
      secret = config.secret,
      pcode = getPcode(config.apiKey),
      path = '/sas/embed_token/' + pcode + '/' + embedCode,
      expires = Date.now() + 86400000,
      params = accountId === void 0 ? {
        api_key: apiKey,
        expires: expires
      } : {
        api_key: apiKey,
        expires: expires,
        account_id: accountId
      },
      method = 'GET', hashStr, signature, token;

  hashStr = sha256(secret + method + path + serialize(params, ''));
  signature = new Buffer(hashStr, 'hex').toString('base64');
  // Remove any trailing '=' sign
  signature = signature.replace(/=+$/, '');

  token = [
    'http://player.ooyala.com' + path,
    [
      serialize(params, '&'),
      ['signature', encodeURIComponent(signature)].join('=')
    ].join('&').replace(/^&+/, '')
  ].join('?');

  //console.log('\ttoken=', token);
  return token;
};