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diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternalResources.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternalResources.php
new file mode 100644
index 000000000..c6562169e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternalResources.php
@@ -0,0 +1,25 @@
+<?php
+
+class HTMLPurifier_URIFilter_DisableExternalResources extends HTMLPurifier_URIFilter_DisableExternal
+{
+    /**
+     * @type string
+     */
+    public $name = 'DisableExternalResources';
+
+    /**
+     * @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)) {
+            return true;
+        }
+        return parent::filter($uri, $config, $context);
+    }
+}
+
+// vim: et sw=4 sts=4