fileSrvc to download files for cordova-plugin-file-opener2

gistfile1.js

'use strict';

angular.module('app')
    .service('fileSrvc', fileSrvc);

fileSrvc.$inject = [];

function fileSrvc() {

    return {
        download: download
    };

    ////////////


    var download = function(url, callback) {

        /* Get file extantion from URL*/
        var ext = url.split('.').pop();

        /* Generate file name */
        var fileInternal = new Date().getTime() + '.' + ext;

        /* Detect device */
        var iosDevice = navigator.userAgent.match(/(iPhone|iPod|iPad)/i);

        CordovaSrvc.ready.then(function() {
            requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem) {
                var fileTransfer = new FileTransfer();

                var downloadPath;

                /* Download path for iOS and android are different */
                if (iosDevice !== null) {
                    downloadPath = fileSystem.root.toURL() + fileInternal;
                } else {
                    downloadPath = cordova.file.externalDataDirectory + fileInternal;
                }

                fileTransfer.download(
                    url,
                    downloadPath,
                    function(file) {
                        callback(null, file.nativeURL);
                    },
                    function(error) {
                        callback(error);
                    },
                    true
                );
            }, function(error) {
                callback(error);
            });
        });
    };
}