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

---
 .../library/HTMLPurifier/URISchemeRegistry.php     | 81 ++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 vendor/ezyang/htmlpurifier/library/HTMLPurifier/URISchemeRegistry.php

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

diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URISchemeRegistry.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URISchemeRegistry.php
new file mode 100644
index 0000000..4ac8a0b
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URISchemeRegistry.php
@@ -0,0 +1,81 @@
+<?php
+
+/**
+ * Registry for retrieving specific URI scheme validator objects.
+ */
+class HTMLPurifier_URISchemeRegistry
+{
+
+    /**
+     * Retrieve sole instance of the registry.
+     * @param HTMLPurifier_URISchemeRegistry $prototype Optional prototype to overload sole instance with,
+     *                   or bool true to reset to default registry.
+     * @return HTMLPurifier_URISchemeRegistry
+     * @note Pass a registry object $prototype with a compatible interface and
+     *       the function will copy it and return it all further times.
+     */
+    public static function instance($prototype = null)
+    {
+        static $instance = null;
+        if ($prototype !== null) {
+            $instance = $prototype;
+        } elseif ($instance === null || $prototype == true) {
+            $instance = new HTMLPurifier_URISchemeRegistry();
+        }
+        return $instance;
+    }
+
+    /**
+     * Cache of retrieved schemes.
+     * @type HTMLPurifier_URIScheme[]
+     */
+    protected $schemes = array();
+
+    /**
+     * Retrieves a scheme validator object
+     * @param string $scheme String scheme name like http or mailto
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return HTMLPurifier_URIScheme
+     */
+    public function getScheme($scheme, $config, $context)
+    {
+        if (!$config) {
+            $config = HTMLPurifier_Config::createDefault();
+        }
+
+        // important, otherwise attacker could include arbitrary file
+        $allowed_schemes = $config->get('URI.AllowedSchemes');
+        if (!$config->get('URI.OverrideAllowedSchemes') &&
+            !isset($allowed_schemes[$scheme])
+        ) {
+            return;
+        }
+
+        if (isset($this->schemes[$scheme])) {
+            return $this->schemes[$scheme];
+        }
+        if (!isset($allowed_schemes[$scheme])) {
+            return;
+        }
+
+        $class = 'HTMLPurifier_URIScheme_' . $scheme;
+        if (!class_exists($class)) {
+            return;
+        }
+        $this->schemes[$scheme] = new $class();
+        return $this->schemes[$scheme];
+    }
+
+    /**
+     * Registers a custom scheme to the cache, bypassing reflection.
+     * @param string $scheme Scheme name
+     * @param HTMLPurifier_URIScheme $scheme_obj
+     */
+    public function register($scheme, $scheme_obj)
+    {
+        $this->schemes[$scheme] = $scheme_obj;
+    }
+}
+
+// vim: et sw=4 sts=4
-- 
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