index.js

var fs = require('fs');
var urlparse = require('url').parse;
var urlformat = require('url').format;
var exec = require('child_process').exec;

var processName = 'iexplore.exe';

function getInternetExplorerExe() {
  var suffix = '\\Internet Explorer\\' + processName,
    prefixes = [process.env['' + 'PROGRAMW6432'], // '' + ' trick to keep jscs happy
                process.env['' + 'PROGRAMFILES(X86)'],
                process.env['' + 'PROGRAMFILES']],
    prefix, i;

  for (i = 0; i < prefixes.length; i++) {
    prefix = prefixes[i];
    if (prefix && fs.existsSync(prefix + suffix)) {
      return prefix + suffix;
    }
  }
}

var IEBrowser = function(baseBrowserDecorator, logger, args) {
  baseBrowserDecorator(this);

  var log = logger.create('launcher');
  var flags = args.flags || [];

  // Handle x-ua-compatible option:
  //
  // Usage :
  //   customLaunchers: {
  //     IE9: {
  //       base: 'IE',
  //       'x-ua-compatible': 'IE=EmulateIE9'
  //     }
  //   }
  //
  // This is done by passing the option on the url, in response the Karma server will
  // set the following meta in the page.
  //   <meta http-equiv="X-UA-Compatible" content="[VALUE]"/>
  function handleXUaCompatible(args, urlObj) {
    if (args['x-ua-compatible']) {
      urlObj.query['x-ua-compatible'] = args['x-ua-compatible'];
    }
  }

  // Spawning iexplore.exe spawns two processes (IE does that). The way karma kills the
  // browser process (hard kill) leaves the other process in memory.
  //
  // The second process is created using command-line args like this:
  //   "C:\Program Files\Internet Explorer\iexplore.exe" SCODEF:2632 CREDAT:275457 /prefetch:2
  // Where the SCODEF value is the pid of the 'original' process created by this launcher.
  //
  // This function kills any iexplore.exe process who's command line args match 'SCODEF:pid'.
  // On IE11 this will kill the extra process. On older versions, no process will be found.
  function killExtraIEProcess(pid, cb) {

    var scodef = 'SCODEF:' + pid;

    //wmic.exe : http://msdn.microsoft.com/en-us/library/aa394531(v=vs.85).aspx
    var wmic = 'wmic.exe Path win32_Process ' +
               'where "Name=\'' + processName + '\' and ' +
               'CommandLine Like \'%' + scodef + '%\'" call Terminate';

    exec(wmic, function(err) {
      if (err) {
        log.error('Killing extra IE process failed. ' + err);
      } else {
        log.debug('Killed extra IE process ' + pid);
      }
      cb();
    });

  }

  this._getOptions = function(url) {
    var urlObj = urlparse(url, true);

    handleXUaCompatible(args, urlObj);

    delete urlObj.search; //url.format does not want search attribute
    url = urlformat(urlObj);

    return [
      '-extoff'
    ].concat(flags, [url]);
  };

  var baseOnProcessExit = this._onProcessExit;
  this._onProcessExit = function(code, errorOutput) {
    var pid = this._process.pid;
    killExtraIEProcess(pid, function() {
      if (baseOnProcessExit) {
        baseOnProcessExit(code, errorOutput);
      }
    });
  };

  // this is to expose the function for unit testing
  this._getInternetExplorerExe = getInternetExplorerExe;
};

IEBrowser.prototype = {
  name: 'IE',
  DEFAULT_CMD: {
    win32: getInternetExplorerExe()
  },
  ENV_CMD: 'IE_BIN'
};

IEBrowser.$inject = ['baseBrowserDecorator', 'logger', 'args'];

// PUBLISH DI MODULE
module.exports = {
  'launcher:IE': ['type', IEBrowser]
};