Add an OriginFilterBuilder class for [white|black]listing origins.

url/origin_filter.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef URL_ORIGIN_FILTER_H_
+#define URL_ORIGIN_FILTER_H_
+
+#include <ostream>
+#include <set>
+#include <vector>
+
+#include "url/gurl.h"
+#include "url/origin.h"
+
+namespace url {
+
+// A utility class to filter browsing data over origins.
+// Unique origins are ignored.
+class URL_EXPORT OriginFilter {
+ public:
+  // A filter that only matches |origins|.
+  static scoped_ptr<OriginFilter> AsWhitelist(
+      const std::vector<Origin>& origins);
+
+  // A filter that matches everything except |origins|.
+  static scoped_ptr<OriginFilter> AsBlacklist(
+      const std::vector<Origin>& origins);
+
+  // An empty filter that matches everything. Equivalent to an empty blacklist.
+  static scoped_ptr<OriginFilter> Empty();
+
+  ~OriginFilter();
+
+  // True if the origin of |url| is in the whitelist, or isn't in the blacklist.
+  bool MatchesURL(const GURL& url) const;
+
+  // True if any origin [scheme, host, port], such that |url| has the same
+  // scheme and port, and |url|'s host is the same or a subdomain of that host,
+  // is in the whitelist, or isn't in the blacklist.
+  bool MatchesURLWithSubdomains(const GURL& url) const;
+
+  // Whether two filters match the same origins.
+  bool operator==(const OriginFilter& other) const;

[brettw, 2016/02/01 22:48:25]

Why do we need to do this comparison?

[msramek, 2016/02/05 17:16:35]

It was used in a gmock matcher. The test that used it now changed, so I removed
it.

+  bool operator!=(const OriginFilter& other) const;
+
+ private:
+  URL_EXPORT friend std::ostream& operator<<(std::ostream& out,
+                                             const OriginFilter& filter);
+
+  OriginFilter(const std::vector<Origin>& origins, bool whitelist_mode);
+
+  // The list of origins and whether they should be interpreted as a whitelist
+  // or blacklist.
+  std::set<Origin> origin_list_;
+  bool whitelist_mode_;
+
+  DISALLOW_COPY_AND_ASSIGN(OriginFilter);
+};
+
+URL_EXPORT std::ostream& operator<<(
+    std::ostream& out, const OriginFilter& filter);
+
+}  // namespace url
+
+#endif  // URL_ORIGIN_FILTER_H_