swf-player-version.js

/*! swf-player-version v1.1.5 | @syranide | MIT license */

(function(root, factory) {
  if (typeof define === 'function' && define.amd) {
    define([], factory);
  } else if (typeof exports === 'object') {
    module.exports = factory();
  } else {
    root.SWFPlayerVersion = factory();
  }
}(this, function() {
  'use strict';

  var detectedVersion;

  function parseVersion(description) {
    var match = description.match(/\d+/g);
    if (match != null) {
      return match.slice(0, 3).join('.');
    }

    return null;
  }

  function detectAvailableVersion() {
    if (typeof navigator === 'object') {
      if (navigator.plugins && navigator.mimeTypes) {
        var plugin = navigator.plugins['Shockwave Flash'];
        var mimeType = navigator.mimeTypes['application/x-shockwave-flash'];

        // FF51 mimeType.enabledPlugin does not return a valid plugin
        if (plugin && mimeType && mimeType.enabledPlugin) {
          // Expected format "Shockwave Flash #.# r#", "Shockwave Flash #.# d#"
          detectedVersion = parseVersion(plugin.description);
          return;
        }
      }
    }

    // ActiveXObject for IE<11
    if (typeof ActiveXObject === 'function') {
      var description;

      try {
        // Throws "Automation server can't create object" if unavailable
        var instance = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
        // Can throw "Out of memory"
        description = instance.GetVariable('$version');
      } catch (e) {
      }

      if (description) {
        // Expected format "WIN #,#,#,#"
        detectedVersion = parseVersion(description);
        return;
      }
    }

    detectedVersion = null;
  }

  /**
   * Get available SWF Player version. Result is cached.
   *
   * @return {?string} '#.#.#' or null.
   */
  function getVersion() {
    if (detectedVersion === undefined) {
      detectAvailableVersion();
    }

    return detectedVersion;
  }

  /**
   * Determine if available SWF Player meets version requirement.
   *
   * @param {string} requiredString '#.#.#', '#.#', '#' or ''.
   * @return {boolean} true if supported.
   */
  function isVersionSupported(requiredString) {
    var availableString = getVersion();

    if (availableString == null) {
      return false;
    }

    var availableFields = availableString.split('.');
    var requiredFields = requiredString.split('.');

    for (var i = 0; i < requiredFields.length; i++) {
      var availableField = availableFields[i] || '0';
      var requiredField = requiredFields[i];

      if (availableField !== requiredField) {
        return +availableField > +requiredField;
      }
    }

    return true;
  }

  var SWFPlayerVersion = {
    get: getVersion,
    isSupported: isVersionSupported
  };

  return SWFPlayerVersion;
}));