filemanger overwriting files (solution)

[tarranjones]

Filemanger currently overwrites files with the same name.
this change will allow the user to choose between overwriting the file or auto increment the file name if it exists.

filemanager.tpl

var overwrite = typeof overwrite != 'undefined' ? overwrite : '';
$.ajax({
    url: 'index.php?route=common/filemanager/upload&token=<?php echo $token; ?>&directory=<?php echo $directory; ?>'+overwrite,
    ........
    success: function(json) {
       overwrite = ' ';
        if (json['error']) {
            if(json['error'] =='exist'){
                overwrite = '&overwrite='+confirm("File exists, Replace old file ? ");
                $('#button-upload').trigger('click');                    
            } else {
                 alert(json['error']);
            }
        }
            ......

Filemanger.php

if(!isset($this->request->get['overwrite']) && file_exists($directory.'/' . $filename)){
    //file exists and user hasn't been asked
    $json['error'] = 'exist';
} else {

    if(isset($this->request->get['overwrite']) && !$this->request->get['overwrite']) {
        //user has been asked(which means file exists ) and doesnt want to overwrite
         $info = pathinfo($filename);
         $i = 0; 
        // rename until file doesnt exist 
         while(file_exists($directory.'/' . $filename)){ 
             $filename = $info['filename']  . '-' . $i++ . $info['extension'];
         }
    }
    move_uploaded_file($this->request->files['file']['tmp_name'], $directory . '/' . $filename);

/* drag/drop upload is currently missing, actually any form of instant upload(no filemanger). 
This provides some better json feedback so it is possible to create js to upload files without the filemanger . */


    if(is_file($directory . '/' . $filename)) {
            $this->load->model('tool/image');
            $json = array(
                'thumb' => $this->model_tool_image->resize(utf8_substr($directory . '/' . $filename, utf8_strlen(DIR_IMAGE)), 100, 100),
                'path' => utf8_substr($directory . '/' . $filename, utf8_strlen(DIR_IMAGE)),
            );
        }
    $json['success'] = $this->language->get('text_uploaded');
}   

This could go further and allow the user to rename the file using prompt()