src/chrome/browser/extensions/blacklist.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_EXTENSIONS_BLACKLIST_H_
   6 #define CHROME_BROWSER_EXTENSIONS_BLACKLIST_H_
   7
   8 #include <list>
   9 #include <map>
  10 #include <set>
  11 #include <string>
  12 #include <vector>
  13
  14 #include "base/callback.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/memory/weak_ptr.h"
  17 #include "base/observer_list.h"
  18 #include "chrome/browser/safe_browsing/database_manager.h"
  19 #include "components/keyed_service/core/keyed_service.h"
  20 #include "content/public/browser/notification_observer.h"
  21 #include "content/public/browser/notification_registrar.h"
  22 #include "extensions/browser/blacklist_state.h"
  23
  24 namespace content {
  25 class BrowserContext;
  26 }
  27
  28 namespace extensions {
  29
  30 class BlacklistStateFetcher;
  31 class Extension;
  32 class ExtensionPrefs;
  33
  34 // The blacklist of extensions backed by safe browsing.
  35 class Blacklist : public KeyedService,
  36                   public content::NotificationObserver,
  37                   public base::SupportsWeakPtr<Blacklist> {
  38  public:
  39   class Observer {
  40    public:
  41     // Observes |blacklist| on construction and unobserves on destruction.
  42     explicit Observer(Blacklist* blacklist);
  43
  44     virtual void OnBlacklistUpdated() = 0;
  45
  46    protected:
  47     virtual ~Observer();
  48
  49    private:
  50     Blacklist* blacklist_;
  51   };
  52
  53   class ScopedDatabaseManagerForTest {
  54    public:
  55     explicit ScopedDatabaseManagerForTest(
  56         scoped_refptr<SafeBrowsingDatabaseManager> database_manager);
  57
  58     ~ScopedDatabaseManagerForTest();
  59
  60    private:
  61     scoped_refptr<SafeBrowsingDatabaseManager> original_;
  62
  63     DISALLOW_COPY_AND_ASSIGN(ScopedDatabaseManagerForTest);
  64   };
  65
  66   typedef std::map<std::string, BlacklistState> BlacklistStateMap;
  67
  68   typedef base::Callback<void(const BlacklistStateMap&)>
  69       GetBlacklistedIDsCallback;
  70
  71   typedef base::Callback<void(const std::set<std::string>&)>
  72       GetMalwareIDsCallback;
  73
  74   typedef base::Callback<void(BlacklistState)> IsBlacklistedCallback;
  75
  76   explicit Blacklist(ExtensionPrefs* prefs);
  77
  78   ~Blacklist() override;
  79
  80   static Blacklist* Get(content::BrowserContext* context);
  81
  82   // From the set of extension IDs passed in via |ids|, asynchronously checks
  83   // which are blacklisted and includes them in the resulting map passed
  84   // via |callback|, which will be sent on the caller's message loop. The values
  85   // of the map are the blacklist state for each extension. Extensions with
  86   // a BlacklistState of NOT_BLACKLISTED are not included in the result.
  87   //
  88   // For a synchronous version which ONLY CHECKS CURRENTLY INSTALLED EXTENSIONS
  89   // see ExtensionPrefs::IsExtensionBlacklisted.
  90   void GetBlacklistedIDs(const std::set<std::string>& ids,
  91                          const GetBlacklistedIDsCallback& callback);
  92
  93   // From the subset of extension IDs passed in via |ids|, select the ones
  94   // marked in the blacklist as BLACKLISTED_MALWARE and asynchronously pass
  95   // to |callback|. Basically, will call GetBlacklistedIDs and filter its
  96   // results.
  97   void GetMalwareIDs(const std::set<std::string>& ids,
  98                      const GetMalwareIDsCallback& callback);
  99
 100   // More convenient form of GetBlacklistedIDs for checking a single extension.
 101   void IsBlacklisted(const std::string& extension_id,
 102                      const IsBlacklistedCallback& callback);
 103
 104   // Used to mock BlacklistStateFetcher in unit tests. Blacklist owns the
 105   // |fetcher|.
 106   void SetBlacklistStateFetcherForTest(BlacklistStateFetcher* fetcher);
 107
 108   // Reset the owned BlacklistStateFetcher to null and return the current
 109   // BlacklistStateFetcher.
 110   BlacklistStateFetcher* ResetBlacklistStateFetcherForTest();
 111
 112   // Adds/removes an observer to the blacklist.
 113   void AddObserver(Observer* observer);
 114   void RemoveObserver(Observer* observer);
 115
 116  private:
 117   // Use via ScopedDatabaseManagerForTest.
 118   static void SetDatabaseManager(
 119       scoped_refptr<SafeBrowsingDatabaseManager> database_manager);
 120   static scoped_refptr<SafeBrowsingDatabaseManager> GetDatabaseManager();
 121
 122   // content::NotificationObserver
 123   void Observe(int type,
 124                const content::NotificationSource& source,
 125                const content::NotificationDetails& details) override;
 126
 127   void GetBlacklistStateForIDs(const GetBlacklistedIDsCallback& callback,
 128                                const std::set<std::string>& blacklisted_ids);
 129
 130   void RequestExtensionsBlacklistState(const std::set<std::string>& ids,
 131                                        const base::Callback<void()>& callback);
 132
 133   void OnBlacklistStateReceived(const std::string& id, BlacklistState state);
 134
 135   void ReturnBlacklistStateMap(const GetBlacklistedIDsCallback& callback,
 136                                const std::set<std::string>& blacklisted_ids);
 137
 138   ObserverList<Observer> observers_;
 139
 140   content::NotificationRegistrar registrar_;
 141
 142   // The cached BlacklistState's, received from BlacklistStateFetcher.
 143   BlacklistStateMap blacklist_state_cache_;
 144
 145   scoped_ptr<BlacklistStateFetcher> state_fetcher_;
 146
 147   typedef std::list<std::pair<std::vector<std::string>,
 148                               base::Callback<void()> > >
 149       StateRequestsList;
 150
 151   // The list of ongoing requests for blacklist states that couldn't be
 152   // served directly from the cache. A new request is created in
 153   // GetBlacklistedIDs and deleted when the callback is called from
 154   // OnBlacklistStateReceived.
 155   StateRequestsList state_requests_;
 156
 157   DISALLOW_COPY_AND_ASSIGN(Blacklist);
 158 };
 159
 160 }  // namespace extensions
 161
 162 #endif  // CHROME_BROWSER_EXTENSIONS_BLACKLIST_H_