Actually make URI.DisableResources do something.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

NEWS

@@ -12,6 +12,8 @@ NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
 4.1.2, unknown release date
 ! Added %Core.RemoveProcessingInstructions, which lets you remove
   <? ... ?> statements.
+! Added %URI.DisableResources functionality; the directive originally
+  did nothing.  Thanks David Rothstein for reporting.
 - Fix improper handling of Internet Explorer conditional comments
   by parser.  Thanks zmonteca for reporting.
 

library/HTMLPurifier/ConfigSchema/schema/URI.DisableResources.txt

@@ -1,12 +1,15 @@
 URI.DisableResources
 TYPE: bool
-VERSION: 1.3.0
+VERSION: 4.1.2
 DEFAULT: false
 --DESCRIPTION--
-
 <p>
     Disables embedding resources, essentially meaning no pictures. You can
     still link to them though. See %URI.DisableExternalResources for why
     this might be a good idea.
 </p>
+<p>
+    <em>Note:</em> While this directive has been available since 1.3.0,
+    it didn't actually start doing anything until 4.1.2.
+</p>
 --# vim: et sw=4 sts=4

library/HTMLPurifier/URIFilter/DisableResources.php

@@ -0,0 +1,11 @@
+<?php
+
+class HTMLPurifier_URIFilter_DisableResources extends HTMLPurifier_URIFilter
+{
+    public $name = 'DisableResources';
+    public function filter(&$uri, $config, $context) {
+        return !$context->get('EmbeddedURI', true);
+    }
+}
+
+// vim: et sw=4 sts=4

tests/HTMLPurifier/URIFilter/DisableResourcesTest.php

@@ -0,0 +1,24 @@
+<?php
+
+class HTMLPurifier_URIFilter_DisableResourcesTest extends HTMLPurifier_URIFilterHarness
+{
+
+    function setUp() {
+        parent::setUp();
+        $this->filter = new HTMLPurifier_URIFilter_DisableResources();
+        $var = true;
+        $this->context->register('EmbeddedURI', $var);
+    }
+
+    function testRemoveResource() {
+        $this->assertFiltering('/foo/bar', false);
+    }
+
+    function testPreserveRegular() {
+        $this->context->destroy('EmbeddedURI'); // undo setUp
+        $this->assertFiltering('/foo/bar');
+    }
+
+}
+
+// vim: et sw=4 sts=4