From 23c124a68afe4d21198528d4f31bacc131d8a708 Mon Sep 17 00:00:00 2001
From: Thomas Jakobi <thomas.jakobi@partout.info>
Date: Fri, 4 Sep 2020 10:59:13 +0200
Subject: [PATCH] Add checksumResource snippet

This snippet will generate the URL to a MODX resource with a checksum on base of the editedon/createdon timestamp for cachebusting (i.e. to use generated script files in a MODX resource).
---
 .../snippets/checksumResource.snippet.php         | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 core/components/checksumfile/elements/snippets/checksumResource.snippet.php

diff --git a/core/components/checksumfile/elements/snippets/checksumResource.snippet.php b/core/components/checksumfile/elements/snippets/checksumResource.snippet.php
new file mode 100644
index 0000000..f6615a2
--- /dev/null
+++ b/core/components/checksumfile/elements/snippets/checksumResource.snippet.php
@@ -0,0 +1,15 @@
+<?php
+$id = $modx->getOption('id', $scriptProperties, '');
+if (empty($id)) return '';
+
+$resource = $modx->getObject('modResource', $id);
+if ($resource) {
+    $date = $resource->get('editedon');
+    $date = ($date) ? $date : $resource->get('createdon');
+    $checksum = hash('crc32b', $date);
+    if (!empty($checksum)) { 
+        $url = $modx->makeUrl($id);
+        return substr_replace($url, '.'.$checksum.'.', strrpos($url, '.'), 1);
+    }
+} 
+return $modx->makeUrl($id);