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// Copyright 2013 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_EXTENSIONS_BLACKLIST_H_
#define CHROME_BROWSER_EXTENSIONS_BLACKLIST_H_
#include <list>
#include <map>
#include <memory>
#include <set>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/callback_list.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/safe_browsing/db/database_manager.h"
#include "extensions/browser/blacklist_state.h"
namespace content {
class BrowserContext;
}
namespace extensions {
class BlacklistStateFetcher;
class ExtensionPrefs;
// The blacklist of extensions backed by safe browsing.
class Blacklist : public KeyedService,
public base::SupportsWeakPtr<Blacklist> {
public:
class Observer {
public:
// Observes |blacklist| on construction and unobserves on destruction.
explicit Observer(Blacklist* blacklist);
virtual void OnBlacklistUpdated() = 0;
protected:
virtual ~Observer();
private:
Blacklist* blacklist_;
};
class ScopedDatabaseManagerForTest {
public:
explicit ScopedDatabaseManagerForTest(
scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager>
database_manager);
~ScopedDatabaseManagerForTest();
private:
scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager> original_;
DISALLOW_COPY_AND_ASSIGN(ScopedDatabaseManagerForTest);
};
using BlacklistStateMap = std::map<std::string, BlacklistState>;
using GetBlacklistedIDsCallback =
base::Callback<void(const BlacklistStateMap&)>;
using GetMalwareIDsCallback =
base::Callback<void(const std::set<std::string>&)>;
using IsBlacklistedCallback = base::Callback<void(BlacklistState)>;
explicit Blacklist(ExtensionPrefs* prefs);
~Blacklist() override;
static Blacklist* Get(content::BrowserContext* context);
// From the set of extension IDs passed in via |ids|, asynchronously checks
// which are blacklisted and includes them in the resulting map passed
// via |callback|, which will be sent on the caller's message loop. The values
// of the map are the blacklist state for each extension. Extensions with
// a BlacklistState of NOT_BLACKLISTED are not included in the result.
//
// For a synchronous version which ONLY CHECKS CURRENTLY INSTALLED EXTENSIONS
// see ExtensionPrefs::IsExtensionBlacklisted.
void GetBlacklistedIDs(const std::set<std::string>& ids,
const GetBlacklistedIDsCallback& callback);
// From the subset of extension IDs passed in via |ids|, select the ones
// marked in the blacklist as BLACKLISTED_MALWARE and asynchronously pass
// to |callback|. Basically, will call GetBlacklistedIDs and filter its
// results.
void GetMalwareIDs(const std::set<std::string>& ids,
const GetMalwareIDsCallback& callback);
// More convenient form of GetBlacklistedIDs for checking a single extension.
void IsBlacklisted(const std::string& extension_id,
const IsBlacklistedCallback& callback);
// Used to mock BlacklistStateFetcher in unit tests. Blacklist owns the
// |fetcher|.
void SetBlacklistStateFetcherForTest(BlacklistStateFetcher* fetcher);
// Reset the owned BlacklistStateFetcher to null and return the current
// BlacklistStateFetcher.
BlacklistStateFetcher* ResetBlacklistStateFetcherForTest();
// Reset the listening for an updated database.
void ResetDatabaseUpdatedListenerForTest();
// Adds/removes an observer to the blacklist.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
private:
// Use via ScopedDatabaseManagerForTest.
static void SetDatabaseManager(
scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager>
database_manager);
static scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager>
GetDatabaseManager();
void ObserveNewDatabase();
void NotifyObservers();
void GetBlacklistStateForIDs(const GetBlacklistedIDsCallback& callback,
const std::set<std::string>& blacklisted_ids);
void RequestExtensionsBlacklistState(const std::set<std::string>& ids,
base::OnceClosure callback);
void OnBlacklistStateReceived(const std::string& id, BlacklistState state);
void ReturnBlacklistStateMap(const GetBlacklistedIDsCallback& callback,
const std::set<std::string>& blacklisted_ids);
base::ObserverList<Observer>::Unchecked observers_;
std::unique_ptr<base::CallbackList<void()>::Subscription>
database_updated_subscription_;
std::unique_ptr<base::CallbackList<void()>::Subscription>
database_changed_subscription_;
// The cached BlacklistState's, received from BlacklistStateFetcher.
BlacklistStateMap blacklist_state_cache_;
std::unique_ptr<BlacklistStateFetcher> state_fetcher_;
// The list of ongoing requests for blacklist states that couldn't be
// served directly from the cache. A new request is created in
// GetBlacklistedIDs and deleted when the callback is called from
// OnBlacklistStateReceived.
//
// This is a list of requests. Each item in the list is a request. A request
// is a pair of [vector of string ids to check, response closure].
std::list<std::pair<std::vector<std::string>, base::OnceClosure>>
state_requests_;
DISALLOW_COPY_AND_ASSIGN(Blacklist);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_BLACKLIST_H_
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