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How to fix special character file names issues during file uploads from custom and drupals form.

Submitted by inder on Sat, 03/13/2010 - 2:41am

How to fix special character file names issues during file uploads from custom and drupals form. specially for security issue.
In hook_init() you can place code for altering $_FILES variables name values to store proper and good file names.

<?php
/**
* Last mod : Inder SIngh @ Sat 12 Mart 2:18 AM 2010
*/
function inders_mod_init() {
        //Add any css or js file there
        drupal_add_css(drupal_get_path('module', 'inders_mod') .'/inders_mod.css');
        //If custom field were used for uploading
        //Never prefered
        if(!empty($_FILES['avatar_image']) || !empty($_FILES['profile_pic'])){
                foreach ($_FILES as $field_name => $field) {
                    $_FILES[$field_name]['orig_name']=$field['name'];
                    $_FILES[$field_name]['name']=preg_replace('`[^\.a-z0-9]`i','_',$field['name']);
            }
        }
        //This will work for all files if using drupal forms
        if (!empty($_FILES['files'])){//Working with global
            foreach ($_FILES['files']['name'] as $field => $filename) {
                if($field=="diagram"){
                    $_FILES['files']['orig_name'][$field] = $filename;//May be useful for some cases
                   
                    //Get the trick to work here
                    $_FILES['files']['name'][$field] = preg_replace('`[^\.a-z0-9]`i','_',$filename);

                }
            }
        }
}
/**
*
*/
?>

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