From 90045d66ea8dd098cb57b5844f05050a528bf037 Mon Sep 17 00:00:00 2001
From: Mikael Nordfeldth <mmn@hethane.se>
Date: Wed, 3 Feb 2016 14:36:51 +0100
Subject: [PATCH] HTMLPurifierSchemes plugin to allow geo and magnet URIs

---
 lib/default.php                               |  1 +
 .../HTMLPurifierSchemesPlugin.php             | 43 +++++++++++++++++++
 .../lib/htmlpurifier/urischeme/geo.php        | 35 +++++++++++++++
 .../lib/htmlpurifier/urischeme/magnet.php     | 35 +++++++++++++++
 4 files changed, 114 insertions(+)
 create mode 100644 plugins/HTMLPurifierSchemes/HTMLPurifierSchemesPlugin.php
 create mode 100644 plugins/HTMLPurifierSchemes/lib/htmlpurifier/urischeme/geo.php
 create mode 100644 plugins/HTMLPurifierSchemes/lib/htmlpurifier/urischeme/magnet.php

diff --git a/lib/default.php b/lib/default.php
index 947875fa58..b59d249f2f 100644
--- a/lib/default.php
+++ b/lib/default.php
@@ -304,6 +304,7 @@ $default =
                             'AuthCrypt' => array(),
                             'Cronish' => array(),
                             'Favorite' => array(),
+                            'HTMLPurifierSchemes' => array(),
                             'Share' => array(),
                             'LRDD' => array(),
                         ),
diff --git a/plugins/HTMLPurifierSchemes/HTMLPurifierSchemesPlugin.php b/plugins/HTMLPurifierSchemes/HTMLPurifierSchemesPlugin.php
new file mode 100644
index 0000000000..d8ca619dec
--- /dev/null
+++ b/plugins/HTMLPurifierSchemes/HTMLPurifierSchemesPlugin.php
@@ -0,0 +1,43 @@
+<?php
+/*
+ * GNU Social - a federating social network
+ * Copyright (C) 2014, Free Software Foundation, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (!defined('GNUSOCIAL')) { exit(1); }
+
+// because autoloading classes won't work otherwise
+require_once INSTALLDIR.'/extlib/HTMLPurifier/HTMLPurifier.auto.php';
+
+/**
+ * @package     Activity
+ * @maintainer  Mikael Nordfeldth <mmn@hethane.se>
+ */
+class HTMLPurifierSchemesPlugin extends Plugin
+{
+    public function onPluginVersion(array &$versions)
+    {
+        $versions[] = array('name' => 'HTMLPurifier Schemes',
+                            'version' => GNUSOCIAL_VERSION,
+                            'author' => 'Mikael Nordfeldth',
+                            'homepage' => 'https://gnu.io/social',
+                            'rawdescription' =>
+                            // TRANS: Plugin description.
+                            _m('Additional URI schemes for HTMLPurifier.'));
+
+        return true;
+    }
+}
diff --git a/plugins/HTMLPurifierSchemes/lib/htmlpurifier/urischeme/geo.php b/plugins/HTMLPurifierSchemes/lib/htmlpurifier/urischeme/geo.php
new file mode 100644
index 0000000000..5a6119967e
--- /dev/null
+++ b/plugins/HTMLPurifierSchemes/lib/htmlpurifier/urischeme/geo.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * Validates geo (geographical coordinates) according to RFC 5870
+ * @todo Filter allowed query parameters and their order
+ */
+
+class HTMLPurifier_URIScheme_geo extends HTMLPurifier_URIScheme
+{
+    /**
+     * @type bool
+     */
+    public $browsable = false;
+
+    /**
+     * @type bool
+     */
+    public $may_omit_host = true;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        $uri->userinfo = null;
+        $uri->host     = null;
+        $uri->port     = null;
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4
diff --git a/plugins/HTMLPurifierSchemes/lib/htmlpurifier/urischeme/magnet.php b/plugins/HTMLPurifierSchemes/lib/htmlpurifier/urischeme/magnet.php
new file mode 100644
index 0000000000..5cb72ca845
--- /dev/null
+++ b/plugins/HTMLPurifierSchemes/lib/htmlpurifier/urischeme/magnet.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * Validates magnet (BitTorrent hash links)
+ * @todo require xt= GET parameter
+ */
+
+class HTMLPurifier_URIScheme_magnet extends HTMLPurifier_URIScheme
+{
+    /**
+     * @type bool
+     */
+    public $browsable = false;
+
+    /**
+     * @type bool
+     */
+    public $may_omit_host = true;
+
+    /**
+     * @param HTMLPurifier_URI $uri
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function doValidate(&$uri, $config, $context)
+    {
+        $uri->userinfo = null;
+        $uri->host     = null;
+        $uri->port     = null;
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4