Supervised users: Prototype of static client-side host blacklist.

chrome/browser/supervised_user/experimental/supervised_user_blacklist.h

Index: chrome/browser/supervised_user/experimental/supervised_user_blacklist.h
diff --git a/chrome/browser/supervised_user/experimental/supervised_user_blacklist.h b/chrome/browser/supervised_user/experimental/supervised_user_blacklist.h
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+// Copyright 2014 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 CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_BLACKLIST_H_
+#define CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_BLACKLIST_H_
+
+#include <string>
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/sha1.h"
+
+namespace base {
+class FilePath;
+}
+
+class GURL;
+
+// Compact list of (SHA1 hashes of) blocked hosts.
+// Checking for URLs is thread-safe, loading is not.
+class SupervisedUserBlacklist {
+ public:
+  struct Hash {
+    Hash() {}
+    explicit Hash(const std::string& host);
+    bool operator<(const Hash& rhs) const;
+
+    unsigned char data[base::kSHA1Length];
+  };
+
+  SupervisedUserBlacklist();
+  ~SupervisedUserBlacklist();
+
+  // Asynchronously read a blacklist from the given file, replacing any previous
+  // entries. |done_callback| will be run after reading finishes (successfully
+  // or not), but not if the SupervisedUserBlacklist is destroyed before that.
+  void ReadFromFile(const base::FilePath& path,
+                    const base::Closure& done_callback);
+
+  bool HasURL(const GURL& url) const;
+
+  size_t GetEntryCount() const;
+
+ private:
+  void OnReadFromFileCompleted(const base::Closure& done_callback,
+                               scoped_ptr<std::vector<Hash> > host_hashes);
+
+  std::vector<Hash> host_hashes_;
+
+  base::WeakPtrFactory<SupervisedUserBlacklist> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SupervisedUserBlacklist);
+};
+
+#endif  // CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_BLACKLIST_H_