wowza-securetoken-generator/lib/wowzatoken.js

Returns a SecureToken v2 URL that can be used to access streams with playback security enabled

'use strict';

var crypto = require('crypto');

/**
 * Replaces all occurrences of string within a string.
 *
 * @param  {String} s
 * @param  {String} r
 * @return {String}
 */
String.prototype.replaceAll = function (s, r) {
  return this.split(s).join(r);
};

var wowza_token = {

  /**
   * Generates secure URL for use with Wowza Streaming Server.
   *
   * @param  {Object} params
   * @return {Object}
   */
  createSecureWowzaURL: function createSecureWowzaURL(params) {

    if (!params === Object(params)) {
      throw new Error('createSecureWowzaURL: Params must be of type object');
      return;
    }

    var params = {
      token_prefix: params.token_prefix || 'wowzatoken',
      streaming_server: params.streaming_server || '',
      streaming_file: params.streaming_file || '',
      streaming_app: params.streaming_app || '',
      hash_algorithm: params.hash_algorithm || 'sha512',
      client_ip: params.client_ip || '',
      shared_secret: params.shared_secret || '',
      start_time: params.start_time ||  '0',
      end_time: params.end_time ||  '0'
    }

    var string_for_hashing = params.streaming_app
                            + '?' + params.client_ip
                            + '&' + params.shared_secret
                            + '&' + params.token_prefix
                            + 'end_time='
                            + params.end_time
                            + '&'
                            + params.token_prefix
                            + 'start_time='
                            + params.start_time;

    var final_hash = crypto.createHash(params.hash_algorithm).update(string_for_hashing).digest("base64");

    // From Wowza documentation: "URL-safe Base64 encoding replaces the '+' character with the '-' character and the '/' character with the '_'."
    var url_safe_hash = final_hash.replaceAll('+', '-').replaceAll('/', '_');

    var final_http_url = 'http://'
                        + params.streaming_server
                        + '/'
                        + params.streaming_app
                        + '/'
                        + params.streaming_file
                        + '?'
                        + params.token_prefix
                        + 'start_time='
                        + params.start_time
                        + '&'
                        + params.token_prefix
                        + 'end_time='
                        + params.end_time
                        + '&'
                        + params.token_prefix
                        + 'hash='
                        + url_safe_hash;

    var final_rtmp_url = 'rtmp://'
                        + params.streaming_server
                        + '/'
                        + params.streaming_app
                        + '?'
                        + params.token_prefix
                        + 'start_time='
                        + params.start_time
                        + '&'
                        + params.token_prefix
                        + 'end_time='
                        + params.end_time
                        + '&'
                        + params.token_prefix
                        + 'hash='
                        + url_safe_hash;

    return {
      http: final_http_url,
      rtmp: final_rtmp_url
    };

  }
}

module.exports = wowza_token;