Separate upload folders for each user group in Evolution CMS

UploadSeparator.plugin.php

//<?php
/**
 * UploadSeparator
 * 
 * Separate upload folders for each user group
 *
 * @category    plugin
 * @version     0.1.0
 * @author      kassio
 * @internal    @properties &folders=Groups to folders relation;text;1==44w9mFQp||2==jG7h8-Mv &common_folder=Name of the common folder;text;common
 * @internal    @events OnFileBrowserInit
 * @internal    @modx_category Manager and Admin
 * @internal    @installset sample
 */

if ($modx->Event->name == 'OnFileBrowserInit') {
	$groups = $modx->getUserDocGroups();	
	$group = array_shift($groups);

	$folders = [];
	
	foreach (explode('||', $params['folders']) as $raw) {
		list($key, $value) = explode('==', $raw);
		$folders[$key] = $value;
	}

	if ($group && isset($folders[$group])) {
		// creating directories
		$parts = ['uploads', $folders[$group]];
		$path  = $params['config']['uploadDir'];
		$dir   = '';
		
		do {
			$dir .= '/' . array_shift($parts);
			
			if (!file_exists($path . $dir)) {
				mkdir($path . $dir);
			}
		} while (!empty($parts));

		// creating link to common folder
		if (!empty($_GET['type']) && is_scalar($_GET['type']) && !file_exists($path . $dir . '/' . $_GET['type'])) {
			mkdir($path . $dir . '/' . $_GET['type']);
		}
		
		if (!empty($_GET['type']) && !empty($params['common_folder'])) {
			$folder = $_GET['type'] . '/' . $params['common_folder'];

			if (file_exists($params['config']['uploadDir'] . '/' . $folder) && !file_exists($params['config']['uploadDir'] . $dir . '/' . $folder)) {
				symlink('../../../' . $folder, $params['config']['uploadDir'] . $dir . '/' . $folder);
			}
		}
		
		// setting new path values
		foreach (['assetsURL', 'uploadURL', 'uploadDir'] as $key) {
			$params['config'][$key] .= $dir;
		}
	}
}