1 files changed, 23 insertions, 0 deletions
diff --git a/library/HTMLPurifier/URIFilter/DisableExternal.php b/library/HTMLPurifier/URIFilter/DisableExternal.php
new file mode 100644
index 000000000..d8a39a501
--- /dev/null
+++ b/library/HTMLPurifier/URIFilter/DisableExternal.php
@@ -0,0 +1,23 @@
+<?php
+
+class HTMLPurifier_URIFilter_DisableExternal extends HTMLPurifier_URIFilter
+{
+    public $name = 'DisableExternal';
+    protected $ourHostParts = false;
+    public function prepare($config) {
+        $our_host = $config->getDefinition('URI')->host;
+        if ($our_host !== null) $this->ourHostParts = array_reverse(explode('.', $our_host));
+    }
+    public function filter(&$uri, $config, $context) {
+        if (is_null($uri->host)) return true;
+        if ($this->ourHostParts === false) return false;
+        $host_parts = array_reverse(explode('.', $uri->host));
+        foreach ($this->ourHostParts as $i => $x) {
+            if (!isset($host_parts[$i])) return false;
+            if ($host_parts[$i] != $this->ourHostParts[$i]) return false;
+        }
+        return true;
+    }
+}
+
+// vim: et sw=4 sts=4