Issue 4450 - Prevent ElemHide filters with empty domains

test/filterClasses.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 348 matching lines @@
   compareFilter(test, "foo.com,~bar##[-abp-properties='abc']", ["type=cssrule", "text=foo.com,~bar##[-abp-properties='abc']", "selectorDomain=foo.com", "selector=[-abp-properties='abc']", "domains=FOO.COM|~BAR", "regexp=abc"]);
   compareFilter(test, "~foo.com,bar.com##[-abp-properties='abc']", ["type=cssrule", "text=~foo.com,bar.com##[-abp-properties='abc']", "selectorDomain=bar.com", "selector=[-abp-properties='abc']", "domains=BAR.COM|~FOO.COM", "regexp=abc"]);
 
   compareFilter(test, "##[-abp-properties='']", ["type=elemhide", "text=##[-abp-properties='']", "selector=[-abp-properties='']"]);
   compareFilter(test, "foo.com#@#[-abp-properties='abc']", ["type=elemhideexception", "text=foo.com#@#[-abp-properties='abc']", "selectorDomain=foo.com", "selector=[-abp-properties='abc']", "domains=FOO.COM"]);
   compareFilter(test, "foo.com##aaa [-abp-properties='abc'] bbb", ["type=cssrule", "text=foo.com##aaa [-abp-properties='abc'] bbb", "selectorDomain=foo.com", "selector=aaa [-abp-properties='abc'] bbb", "domains=FOO.COM", "prefix=aaa ", "regexp=abc", "suffix= bbb"]);
   compareFilter(test, "foo.com##[-abp-properties='|background-image: url(data:*)']", ["type=cssrule", "text=foo.com##[-abp-properties='|background-image: url(data:*)']", "selectorDomain=foo.com", "selector=[-abp-properties='|background-image: url(data:*)']", "domains=FOO.COM", "regexp=^background\\-image\\:\\ url\\(data\\:.*\\)"]);
 
   test.done();
 };
+
+exports.testEmptyElemHideDomains = function(test)
+{
+  let emptyDomainFilters = [
+    ",##selector", ",,,##selector", "~,foo.com##selector", "foo.com,##selector",
+    ",foo.com##selector", "foo.com,~##selector",
+    "foo.com,,bar.com##selector", "foo.com,~,bar.com##selector"
+  ];
+
+  for (let filterText of emptyDomainFilters)
+  {
+    let filter = Filter.fromText(filterText);
+    test.ok(filter instanceof InvalidFilter);
+    test.equal(filter.reason, "filter_invalid_domain");
+  }
+
+  test.done();
+};