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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 COMPONENTS_SUGGESTIONS_BLACKLIST_STORE_H_
#define COMPONENTS_SUGGESTIONS_BLACKLIST_STORE_H_
#include <map>
#include <string>
#include "base/macros.h"
#include "base/time/time.h"
#include "components/suggestions/proto/suggestions.pb.h"
#include "url/gurl.h"
class PrefService;
namespace user_prefs {
class PrefRegistrySyncable;
} // namespace user_prefs
namespace suggestions {
// A helper class for reading, writing, modifying and applying a small URL
// blacklist, pending upload to the server. The class has a concept of time
// duration before which a blacklisted URL becomes candidate for upload to the
// server. Keep in mind most of the operations involve interaction with the disk
// (the profile's preferences). Note that the class should be used as a
// singleton for the upload candidacy to work properly.
class BlacklistStore {
public:
BlacklistStore(
PrefService* profile_prefs,
const base::TimeDelta& upload_delay = base::TimeDelta::FromSeconds(15));
virtual ~BlacklistStore();
// Returns true if successful or |url| was already in the blacklist. If |url|
// was already in the blacklist, its blacklisting timestamp gets updated.
virtual bool BlacklistUrl(const GURL& url);
// Gets the time until any URL is ready for upload. Returns false if the
// blacklist is empty.
virtual bool GetTimeUntilReadyForUpload(base::TimeDelta* delta);
// Gets the time until |url| is ready for upload. Returns false if |url| is
// not part of the blacklist.
virtual bool GetTimeUntilURLReadyForUpload(const GURL& url,
base::TimeDelta* delta);
// Sets |url| to a URL from the blacklist that is candidate for upload.
// Returns false if there is no candidate for upload.
virtual bool GetCandidateForUpload(GURL* url);
// Removes |url| from the stored blacklist. Returns true if successful, false
// on failure or if |url| was not in the blacklist. Note that this function
// does not enforce a minimum time since blacklist before removal.
virtual bool RemoveUrl(const GURL& url);
// Applies the blacklist to |suggestions|.
virtual void FilterSuggestions(SuggestionsProfile* suggestions);
// Register BlacklistStore related prefs in the Profile prefs.
static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
protected:
// Test seam. For simplicity of mock creation.
BlacklistStore();
// Loads the blacklist data from the Profile preferences into
// |blacklist|. If there is a problem with loading, the pref value is
// cleared, false is returned and |blacklist| is cleared. If successful,
// |blacklist| will contain the loaded data and true is returned.
bool LoadBlacklist(SuggestionsBlacklist* blacklist);
// Stores the provided |blacklist| to the Profile preferences, using
// a base64 encoding of its protobuf serialization.
bool StoreBlacklist(const SuggestionsBlacklist& blacklist);
// Clears any blacklist data from the profile's preferences.
void ClearBlacklist();
private:
// The pref service used to persist the suggestions blacklist.
PrefService* pref_service_;
// Delay after which a URL becomes candidate for upload, measured from the
// last time the URL was added.
base::TimeDelta upload_delay_;
// The times at which URLs were blacklisted. Used to determine when a URL is
// valid for server upload. Guaranteed to contain URLs that are not ready for
// upload. Might not contain URLs that are ready for upload.
std::map<std::string, base::TimeTicks> blacklist_times_;
DISALLOW_COPY_AND_ASSIGN(BlacklistStore);
};
} // namespace suggestions
#endif // COMPONENTS_SUGGESTIONS_BLACKLIST_STORE_H_
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