domharrington

module.exports = downloadAjaxFile

function downloadAjaxFile (xhr) {
  /* jshint maxcomplexity: 7 */
  var filename = ''
    , disposition = xhr.getResponseHeader('Content-Disposition')

  if (disposition && disposition.indexOf('attachment') !== -1) {
    var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/
      , matches = filenameRegex.exec(disposition)