google sheets UiApi to htmlservice script file upload - google-apps-script

Question

I got the problem since google isnt supporting UIapi anymore i cant use the code below. Could someone help me with it and re-edit to html service? I have no clue about any of those stuff. Code was copied from other site long time ago. Tryed to find a solution for the last 2 days and nothing. Would be really greatfull.
regards
// upload document into google spreadsheet
// and put link to it into current cell
function onOpen(e) {
var ss = SpreadsheetApp.getActiveSpreadsheet()
var menuEntries = [];
menuEntries.push({name: "", functionName: "doGet"});
ss.addMenu("", menuEntries);
}
function doGet(e) {
var app = UiApp.createApplication().setTitle("");
SpreadsheetApp.getActiveSpreadsheet().show(app);
var form = app.createFormPanel().setId('frm').setEncoding('multipart/form-data');
var formContent = app.createVerticalPanel();
form.add(formContent);
formContent.add(app.createFileUpload().setName('thefile'));
// these parameters need to be passed by form
// in doPost() these cannot be found out anymore
formContent.add(app.createHidden("activeCell", SpreadsheetApp.getActiveRange().getA1Notation()));
formContent.add(app.createHidden("activeSheet", SpreadsheetApp.getActiveSheet().getName()));
formContent.add(app.createHidden("activeSpreadsheet", SpreadsheetApp.getActiveSpreadsheet().getId()));
formContent.add(app.createSubmitButton(''));
app.add(form);
SpreadsheetApp.getActiveSpreadsheet().show(app);
return app;
}
function doPost(e) {
var app = UiApp.getActiveApplication();
app.createLabel('');
var fileBlob = e.parameter.thefile;
var doc = DriveApp.getFolderById('0BzI2pkyLXZ5maWo5b2Uyb3JWdzQ').createFile(fileBlob);
var label = app.createLabel('');
// write value into current cell
var value = 'hyperlink("' + doc.getUrl() + '";"' + doc.getName() + '")'
var activeSpreadsheet = e.parameter.activeSpreadsheet;
var activeSheet = e.parameter.activeSheet;
var activeCell = e.parameter.activeCell;
var label = app.createLabel('');
app.add(label);
SpreadsheetApp.openById(activeSpreadsheet).getSheetByName(activeSheet).getRange(activeCell).setFormula(value);
app.close();
return app;
}