/**
  * Upload single file
  *
  * @param void
  * @return null
  */
 function upload_single()
 {
     if ($this->request->isSubmitted()) {
         if (!File::canAdd($this->logged_user, $this->active_project)) {
             if ($this->request->isApiCall()) {
                 $this->httpError(HTTP_ERR_FORBIDDEN, null, true, true);
             } else {
                 die('error - upload not permitted');
             }
             // if
         }
         // if
         $file_data = $this->request->post('file');
         if (!is_array($file_data)) {
             $file_data = array('milestone_id' => $this->request->get('milestone_id'), 'visibility' => $this->active_project->getDefaultVisibility());
             if (instance_of($this->active_category, 'Category')) {
                 $file_data['parent_id'] = $this->active_category->getId();
             }
             // if
         }
         // if
         $this->smarty->assign('file_data', $file_data);
         if ($this->request->isSubmitted()) {
             db_begin_work();
             $this->active_file = new File();
             $attached = attach_from_files($this->active_file, $this->logged_user);
             // Do we have an upload error?
             if (is_error($attached) || $attached != 1) {
                 if ($this->request->isApiCall()) {
                     $this->serveData(is_error($attached) ? $attached : new Error('0 files uploaded'));
                 } else {
                     die('error - nothing uploaded');
                 }
                 // if
             }
             // if
             $this->active_file->setAttributes($file_data);
             if ($this->active_file->getName() == '') {
                 $this->active_file->setName($this->active_file->pending_files[0]['name']);
             }
             // if
             $this->active_file->setRevision(1);
             $this->active_file->setProjectId($this->active_project->getId());
             if (trim($this->active_file->getCreatedByName()) == '' || trim($this->active_file->getCreatedByEmail()) == '') {
                 $this->active_file->setCreatedBy($this->logged_user);
             }
             // if
             $this->active_file->setState(STATE_VISIBLE);
             $save = $this->active_file->save();
             if ($save && !is_error($save)) {
                 if ($this->active_file->countRevisions() > 0) {
                     $subscribers = array($this->logged_user->getId());
                     if (is_foreachable($this->request->post('notify_users'))) {
                         $subscribers = array_merge($subscribers, $this->request->post('notify_users'));
                     } else {
                         $subscribers[] = $this->active_project->getLeaderId();
                     }
                     // if
                     if (!in_array($this->active_project->getLeaderId(), $subscribers)) {
                         $subscribers[] = $this->active_project->getLeaderId();
                     }
                     // if
                     Subscriptions::subscribeUsers($subscribers, $this->active_file);
                     db_commit();
                     $this->active_file->ready();
                     //#738 - 12 March 2012 BOF
                     $assignees_flag_data = $this->request->post('assignee');
                     $this->active_file->register_assignees_flag($assignees_flag_data, true);
                     //#738 - 12 March 2012 EOF
                     if ($this->request->isApiCall()) {
                         $this->serveData($this->active_file, 'file');
                     } else {
                         die('success');
                         // async
                     }
                     // if
                 } else {
                     if ($this->request->isApiCall()) {
                         $this->httpError(HTTP_ERR_OPERATION_FAILED, null, true, true);
                     } else {
                         die('error - unable to attach file');
                     }
                     // if
                 }
                 // if
             } else {
                 if ($this->request->isApiCall()) {
                     $this->serveData($save);
                 } else {
                     die('error - could not save file object');
                     // async
                 }
                 // if
             }
             // if
         }
         // if
     } else {
         if ($this->request->isApiCall()) {
             $this->httpError(HTTP_ERR_BAD_REQUEST, null, true, true);
         } else {
             die('error - request is not POST request');
             // async
         }
         // if
     }
     // if
 }