From 6854cb3f4d8219cf1829e32122eb2502a916eae9 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 1 Feb 2020 09:05:48 +0100
Subject: initial checkin

---
 .../HTMLPurifier/AttrTransform/Nofollow.php        | 52 ++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php

(limited to 'vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php')

diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php
new file mode 100644
index 0000000..1057ebe
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php
@@ -0,0 +1,52 @@
+<?php
+
+// must be called POST validation
+
+/**
+ * Adds rel="nofollow" to all outbound links.  This transform is
+ * only attached if Attr.Nofollow is TRUE.
+ */
+class HTMLPurifier_AttrTransform_Nofollow extends HTMLPurifier_AttrTransform
+{
+    /**
+     * @type HTMLPurifier_URIParser
+     */
+    private $parser;
+
+    public function __construct()
+    {
+        $this->parser = new HTMLPurifier_URIParser();
+    }
+
+    /**
+     * @param array $attr
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    public function transform($attr, $config, $context)
+    {
+        if (!isset($attr['href'])) {
+            return $attr;
+        }
+
+        // XXX Kind of inefficient
+        $url = $this->parser->parse($attr['href']);
+        $scheme = $url->getSchemeObj($config, $context);
+
+        if ($scheme->browsable && !$url->isLocal($config, $context)) {
+            if (isset($attr['rel'])) {
+                $rels = explode(' ', $attr['rel']);
+                if (!in_array('nofollow', $rels)) {
+                    $rels[] = 'nofollow';
+                }
+                $attr['rel'] = implode(' ', $rels);
+            } else {
+                $attr['rel'] = 'nofollow';
+            }
+        }
+        return $attr;
+    }
+}
+
+// vim: et sw=4 sts=4
-- 
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