Compressed activity log database storage

chrome/browser/extensions/activity_log/activity_log_policy.cc

 // 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.
 
 #include "chrome/browser/extensions/activity_log/activity_log_policy.h"
 
 #include <stdint.h>
 
 #include "base/files/file_path.h"
+#include "base/json/json_string_value_serializer.h"
 #include "base/logging.h"
+#include "base/strings/stringprintf.h"
 #include "base/time/clock.h"
 #include "base/time/time.h"
+#include "chrome/browser/extensions/activity_log/activity_action_constants.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/extension.h"
 #include "content/public/browser/browser_thread.h"
 #include "url/gurl.h"
 
 using content::BrowserThread;
 
+namespace constants = activity_log_constants;
+
+namespace {
+// Obsolete database tables: these should be dropped from the database if
+// found.
+const char* kObsoleteTables[] = {"activitylog_apis", "activitylog_blocked",
+                                 "activitylog_urls"};
+}  // namespace
+
 namespace extensions {
 
-ActivityLogPolicy::ActivityLogPolicy(Profile* profile) : testing_clock_(NULL) {}
+ActivityLogPolicy::ActivityLogPolicy(Profile* profile) {}
 
 ActivityLogPolicy::~ActivityLogPolicy() {}
 
+void ActivityLogPolicy::SetClockForTesting(scoped_ptr<base::Clock> clock) {
+  testing_clock_.reset(clock.release());
+}
+
 base::Time ActivityLogPolicy::Now() const {
   if (testing_clock_)
     return testing_clock_->Now();
   else
     return base::Time::Now();
 }
 
-std::string ActivityLogPolicy::GetKey(KeyType) const {
-  return std::string();
-}
-
 ActivityLogDatabasePolicy::ActivityLogDatabasePolicy(
     Profile* profile,
     const base::FilePath& database_name)
     : ActivityLogPolicy(profile) {
   CHECK(profile);
   base::FilePath profile_base_path = profile->GetPath();
   db_ = new ActivityDatabase(this);
   base::FilePath database_path = profile_base_path.Append(database_name);
   ScheduleAndForget(db_, &ActivityDatabase::Init, database_path);
 }
 
 sql::Connection* ActivityLogDatabasePolicy::GetDatabaseConnection() const {
   return db_->GetSqlConnection();
 }
 
+// static
+std::string ActivityLogPolicy::Util::Serialize(const base::Value* value) {
+  std::string value_as_text;
+  if (!value) {
+    value_as_text = "";
+  } else {
+    JSONStringValueSerializer serializer(&value_as_text);
+    serializer.SerializeAndOmitBinaryValues(*value);
+  }
+  return value_as_text;
+}
+
+// static
+void ActivityLogPolicy::Util::StripPrivacySensitiveFields(
+    scoped_refptr<Action> action) {
+  // Clear incognito URLs/titles.
+  if (action->page_incognito()) {
+    action->set_page_url(GURL());
+    action->set_page_title("");
+  }
+  if (action->arg_incognito()) {
+    action->set_arg_url(GURL());
+  }
+
+  // Strip query parameters, username/password, etc., from URLs.
+  if (action->page_url().is_valid() || action->arg_url().is_valid()) {
+    url_canon::Replacements<char> url_sanitizer;
+    url_sanitizer.ClearUsername();
+    url_sanitizer.ClearPassword();
+    url_sanitizer.ClearQuery();
+    url_sanitizer.ClearRef();
+
+    if (action->page_url().is_valid())
+      action->set_page_url(action->page_url().ReplaceComponents(url_sanitizer));
+    if (action->arg_url().is_valid())
+      action->set_arg_url(action->arg_url().ReplaceComponents(url_sanitizer));
+  }
+
+  // Clear WebRequest details; only keep a record of which types of
+  // modifications were performed.
+  if (action->action_type() == Action::ACTION_WEB_REQUEST) {
+    DictionaryValue* details = NULL;
+    if (action->mutable_other()->GetDictionary(constants::kActionWebRequest,
+                                               &details)) {
+      DictionaryValue::Iterator details_iterator(*details);
+      while (!details_iterator.IsAtEnd()) {
+        details->SetBoolean(details_iterator.key(), true);
+        details_iterator.Advance();
+      }
+    }
+  }
+}
+
+// static
+void ActivityLogPolicy::Util::StripArguments(
+    const std::set<std::string>& api_whitelist,
+    scoped_refptr<Action> action) {
+  if (action->action_type() != Action::ACTION_API_CALL &&
+      action->action_type() != Action::ACTION_API_EVENT &&
+      action->action_type() != Action::ACTION_API_BLOCKED)
+    return;
+
+  if (api_whitelist.find(action->api_name()) == api_whitelist.end())
+    action->set_args(scoped_ptr<ListValue>());
+}
+
+// static
+base::Time ActivityLogPolicy::Util::AddDays(const base::Time& base_date,
+                                            int days) {
+  // To allow for time zone changes, add an additional partial day then round
+  // down to midnight.
+  return (base_date + base::TimeDelta::FromDays(days) +
+          base::TimeDelta::FromHours(4)).LocalMidnight();
+}
+
+// static
+void ActivityLogPolicy::Util::ComputeDatabaseTimeBounds(const base::Time& now,
+                                                        int days_ago,
+                                                        int64* early_bound,
+                                                        int64* late_bound) {
+  base::Time morning_midnight = now.LocalMidnight();
+  if (days_ago == 0) {
+      *early_bound = morning_midnight.ToInternalValue();
+      *late_bound = base::Time::Max().ToInternalValue();
+  } else {
+      base::Time early_time = Util::AddDays(morning_midnight, -days_ago);
+      base::Time late_time = Util::AddDays(early_time, 1);
+      *early_bound = early_time.ToInternalValue();
+      *late_bound = late_time.ToInternalValue();
+  }
+}
+
+// static
+bool ActivityLogPolicy::Util::DropObsoleteTables(sql::Connection* db) {
+  for (size_t i = 0; i < arraysize(kObsoleteTables); i++) {
+    const char* table_name = kObsoleteTables[i];
+    if (db->DoesTableExist(table_name)) {
+      std::string drop_statement =
+          base::StringPrintf("DROP TABLE %s", table_name);
+      if (!db->Execute(drop_statement.c_str())) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
 }  // namespace extensions