Safebrowsing: change gethash caching to match api 2.3 rules, fix some corner cases.

chrome/browser/safe_browsing/database_manager.h

 // Copyright (c) 2012 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.
 //
 // The Safe Browsing service is responsible for downloading anti-phishing and
 // anti-malware tables and checking urls against them.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_DATABASE_MANAGER_H_
 #define CHROME_BROWSER_SAFE_BROWSING_DATABASE_MANAGER_H_
 
@@ skipping 58 matching lines @@
     std::vector<SBThreatType> url_results;
     std::vector<SBFullHash> full_hashes;
     std::vector<SBThreatType> full_hash_results;
 
     Client* client;
     bool need_get_hash;
     base::TimeTicks start;  // When check was sent to SB service.
     safe_browsing_util::ListType check_type;  // See comment in constructor.
     std::vector<SBThreatType> expected_threats;
     std::vector<SBPrefix> prefix_hits;
-    std::vector<SBFullHashResult> full_hits;
+    std::vector<SBFullHashResult> cache_hits;
 
     // Vends weak pointers for TimeoutCallback().  If the response is
     // received before the timeout fires, factory is destructed and
     // the timeout won't be fired.
     // TODO(lzheng): We should consider to use this time out check
     // for browsing too (instead of implementin in
     // safe_browsing_resource_handler.cc).
     scoped_ptr<base::WeakPtrFactory<
         SafeBrowsingDatabaseManager> > timeout_factory_;
 
@@ skipping 82 matching lines @@
 
   // Check if the CSD malware IP matching kill switch is turned on.
   virtual bool IsMalwareKillSwitchOn();
 
   // Called on the IO thread to cancel a pending check if the result is no
   // longer needed.
   void CancelCheck(Client* client);
 
   // Called on the IO thread when the SafeBrowsingProtocolManager has received
   // the full hash results for prefix hits detected in the database.
-  void HandleGetHashResults(
-      SafeBrowsingCheck* check,
-      const std::vector<SBFullHashResult>& full_hashes,
-      bool can_cache);
+  void HandleGetHashResults(SafeBrowsingCheck* check,
+                            const std::vector<SBFullHashResult>& full_hashes,
+                            const base::TimeDelta& cache_lifetime);
 
   // Log the user perceived delay caused by SafeBrowsing. This delay is the time
   // delta starting from when we would have started reading data from the
   // network, and ending when the SafeBrowsing check completes indicating that
   // the current page is 'safe'.
   void LogPauseDelay(base::TimeDelta time);
 
   // Called to initialize objects that are used on the io_thread.  This may be
   // called multiple times during the life of the DatabaseManager. Should be
   // called on IO thread.
@@ skipping 89 matching lines @@
 
   // Called on the db thread to close the database.  See CloseDatabase().
   void OnCloseDatabase();
 
   // Runs on the db thread to reset the database. We assume that resetting the
   // database is a synchronous operation.
   void OnResetDatabase();
 
   // Store in-memory the GetHash response. Runs on the database thread.
   void CacheHashResults(const std::vector<SBPrefix>& prefixes,
-                        const std::vector<SBFullHashResult>& full_hashes);
+                        const std::vector<SBFullHashResult>& full_hashes,
+                        const base::TimeDelta& cache_lifetime);
 
   // Internal worker function for processing full hashes.
   void OnHandleGetHashResults(SafeBrowsingCheck* check,
                               const std::vector<SBFullHashResult>& full_hashes);
 
   // Run one check against |full_hashes|.  Returns |true| if the check
   // finds a match in |full_hashes|.
   bool HandleOneCheck(SafeBrowsingCheck* check,
                       const std::vector<SBFullHashResult>& full_hashes);
 
@@ skipping 88 matching lines @@
 
   std::deque<QueuedCheck> queued_checks_;
 
   // Timeout to use for safe browsing checks.
   base::TimeDelta check_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingDatabaseManager);
 };
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_DATABASE_MANAGER_H_