Cordova文件管理，这是正确的做法

Question

我正在使用Phonegap制作应用程序，用户可以在其中选择和共享文件。当用户选择它即使离线或关闭应用程序我应该将其上传回服务器，所以我需要存储参考文件路径。以下是我使用的步骤和代码

1. 用户使用相机选择/捕捉视频或图像。
2. 文件可能不包含每次Android中名称的扩展名，在iOS中从Gallery中选择。
3. 因此，获取mimeType，然后使用新名称和扩展名将文件复制到myApp的文件夹。
4. 然后再次获取mimeType并返回。

但我的问题是，无论何时用户选择媒体文件，复制文件和其他位置是否正确。

代码

 var obj = {
    destinationType: navigator.camera.DestinationType[fromCamera ? 'FILE_URI' : 'NATIVE_URI'],
    // If I use NATIVE_URI for when taking from Camera it returns null.
    sourceType: navigator.camera.PictureSourceType[fromCamera ? 'CAMERA' : 'PHOTOLIBRARY'],
    mediaType: navigator.camera.MediaType[image ? 'PICTURE' : 'VIDEO']
}, that = this;

if (image && fromCamera) {
    obj.correctOrientation = true;
    obj.quality = 40;
}

return new Promise(function (resolve, reject) {
    navigator.camera.getPicture(function (url) {
        var fail = function () {
            resolve(false);
        }
        window.setTimeout(function () {
            // mimeType uses window.resolveLocalFileSystemURL to get fileEntry
            that.mimeType(url).then(function (mimeObj) {
                /* 
                    mimeObj contains object like below  
                    {lastModified:'', fileType:'', fileExtension:'', name : ''}
                */
                if (mimeObj) {
                    // that.fileSystem() resolves fileSystem
                    that.fileSystem().then(function (fs) {
                        // dirName is where I want to store all myApp's media files.
                        var dirName = 'myApp/media/' + (image ? "images" : "videos") + '/';
                        that.getFile(url).then(function (fileEntry) {
                            // getFile uses window.resolveLocalFileSystemURL and returns fileEntry
                            that.moveTo(fs, fileEntry, dirName, mimeObj.name).then(function (entry) {
                                // MoveTo fill copy the same file to directory where I am manintaing files.
                                mimeObj.localURL = entry.nativeURL;
                                /* 
                                    mimeObj is failing to find extension 
                                    when user selects it from different albums. But not when user uses Camera. 
                                    So I am making again mimeType call.
                                */
                                that.mimeType(mimeObj.localURL).then(function (mimeObj) {
                                    // This gives me exact mimeObj that I need.
                                    resolve(mimeObj);
                                });
                            }, fail);
                        }, fail);
                    }, fail);
                } else {
                    resolve(false);
                }
            });
        }, 0);

    }, function (fail_message) {
        window.setTimeout(function () {
            reject(fail_message);
        }, 0);
    }, obj);
});