Fine Uploader - objectProperties - Key - amazon-s3

Question

I have 1 page whick give to user add new car to his cars collection.
User MUST to add minimum 1 image to this car item.
In AWS S3 service I save images in this path architecture:
bucket_name/cars/HERE_IS_USER_ID/HERE_IS_CAR_ID/and here photos
I use fine uploader.
ANd If i do add car in 2 step - all is going good
In 1 step I add to my database car - and send from server side userId and new car Id.
And then in step 2 I init Fine uploader with this id:
Below Code:
(function () {
'use strict';
angular
.module('cars.services.fineUploader', ['ngResource'])
.factory('FineUploader', ['$resource', '$http', 'AppConfig', function ($resource, $http, AppConfig) {
return function (divId, templateName, autoUpload, foldersBtn, uploadSuccessCallback, type, parentId, id) {
var key = '';
var keyExist = false;
getKey();
if (!qq.supportedFeatures.folderSelection) {
document.getElementById(foldersBtn).style.display = "none";
}
var uploader = new qq.s3.FineUploader({
element: document.getElementById(divId),
template: templateName,
autoUpload: autoUpload,
request: {
endpoint: 'carsbucket.s3.amazonaws.com',
accessKey: 'ACCESS',
},
extraButtons: [
{
element: document.getElementById(foldersBtn),
folders: true
}
],
signature: {
endpoint: AppConfig.apiUrl + 'api/AmazonS3/GetSignature'
},
uploadSuccess: {
endpoint: uploadSuccessCallback()
},
iframeSupport: {
localBlankPagePath: '/success.html'
},
objectProperties: {
key: function (id) {
var fileName = uploader.getName(id);
var ext = qq.getExtension(fileName);
return key+ '/' + fileName + "." + ext;
}
}
});
return {
Uploader: function () {
return uploader;
},
StartUpload: function () {
uploader.uploadStoredFiles();
},
InitUploader: function () {
while (!keyExist) {
getKey();
}
}
};
function getKey() {
var itemRequest = {
"ItemType": type,
"ParentId": parentId,
"ItemId": id
};
$http.post("http://localhost:42309/api/AmazonS3/GetItemKey", itemRequest).success(function (data, status) {
key = data;
keyExist = true;
});
}
}
}]);
})();
And this is code how I init this service:
function Uploader(shopId, shopItemId) {
vm.step = 2;
uploader = FineUploader('s3FU', 'qq-template-gallery', false, 'foldersButton', testCallback, 1, shopId, shopItemId);
}
Now I want to do all ADD ITEM logic in 1 step
But I dont know how do it - because I need init FineUploader - but I dont have carId and UserId
.........