From 8df3db566a3a937b45ebf11adb90d265e6f5e2d4 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sun, 17 Nov 2019 20:45:02 +0100
Subject: initial checking of customized version 1.0rc9

---
 .../library/HTMLPurifier/URIFilter/Munge.php       | 115 +++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/Munge.php

(limited to 'vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/Munge.php')

diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/Munge.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/Munge.php
new file mode 100644
index 0000000..6e03315
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/Munge.php
@@ -0,0 +1,115 @@
+<?php
+
+class HTMLPurifier_URIFilter_Munge extends HTMLPurifier_URIFilter
+{
+    /**
+     * @type string
+     */
+    public $name = 'Munge';
+
+    /**
+     * @type bool
+     */
+    public $post = true;
+
+    /**
+     * @type string
+     */
+    private $target;
+
+    /**
+     * @type HTMLPurifier_URIParser
+     */
+    private $parser;
+
+    /**
+     * @type bool
+     */
+    private $doEmbed;
+
+    /**
+     * @type string
+     */
+    private $secretKey;
+
+    /**
+     * @type array
+     */
+    protected $replace = array();
+
+    /**
+     * @param HTMLPurifier_Config $config
+     * @return bool
+     */
+    public function prepare($config)
+    {
+        $this->target = $config->get('URI.' . $this->name);
+        $this->parser = new HTMLPurifier_URIParser();
+        $this->doEmbed = $config->get('URI.MungeResources');
+        $this->secretKey = $config->get('URI.MungeSecretKey');
+        if ($this->secretKey && !function_exists('hash_hmac')) {
+            throw new Exception("Cannot use %URI.MungeSecretKey without hash_hmac support.");
+        }
+        return true;
+    }
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function filter(&$uri, $config, $context)
+    {
+        if ($context->get('EmbeddedURI', true) && !$this->doEmbed) {
+            return true;
+        }
+
+        $scheme_obj = $uri->getSchemeObj($config, $context);
+        if (!$scheme_obj) {
+            return true;
+        } // ignore unknown schemes, maybe another postfilter did it
+        if (!$scheme_obj->browsable) {
+            return true;
+        } // ignore non-browseable schemes, since we can't munge those in a reasonable way
+        if ($uri->isBenign($config, $context)) {
+            return true;
+        } // don't redirect if a benign URL
+
+        $this->makeReplace($uri, $config, $context);
+        $this->replace = array_map('rawurlencode', $this->replace);
+
+        $new_uri = strtr($this->target, $this->replace);
+        $new_uri = $this->parser->parse($new_uri);
+        // don't redirect if the target host is the same as the
+        // starting host
+        if ($uri->host === $new_uri->host) {
+            return true;
+        }
+        $uri = $new_uri; // overwrite
+        return true;
+    }
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     */
+    protected function makeReplace($uri, $config, $context)
+    {
+        $string = $uri->toString();
+        // always available
+        $this->replace['%s'] = $string;
+        $this->replace['%r'] = $context->get('EmbeddedURI', true);
+        $token = $context->get('CurrentToken', true);
+        $this->replace['%n'] = $token ? $token->name : null;
+        $this->replace['%m'] = $context->get('CurrentAttr', true);
+        $this->replace['%p'] = $context->get('CurrentCSSProperty', true);
+        // not always available
+        if ($this->secretKey) {
+            $this->replace['%t'] = hash_hmac("sha256", $string, $this->secretKey);
+        }
+    }
+}
+
+// vim: et sw=4 sts=4
-- 
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