Clean up old legacy preference migration logic.

components/user_prefs/tracked/tracked_preferences_migration_unittest.cc

 // 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.
 
 #include "components/user_prefs/tracked/tracked_preferences_migration.h"
 
 #include <memory>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/strings/string_split.h"
 #include "base/values.h"
 #include "components/prefs/testing_pref_service.h"
 #include "components/user_prefs/tracked/dictionary_hash_store_contents.h"
 #include "components/user_prefs/tracked/hash_store_contents.h"
 #include "components/user_prefs/tracked/interceptable_pref_filter.h"
 #include "components/user_prefs/tracked/pref_hash_store.h"
 #include "components/user_prefs/tracked/pref_hash_store_impl.h"
 #include "components/user_prefs/tracked/pref_hash_store_transaction.h"
-#include "components/user_prefs/tracked/pref_service_hash_store_contents.h"
 #include "components/user_prefs/tracked/tracked_preferences_migration.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 // An unprotected pref.
 const char kUnprotectedPref[] = "unprotected";
 // A protected pref.
 const char kProtectedPref[] = "protected";
 // A protected pref which is initially stored in the unprotected store.
@@ skipping 44 matching lines @@
 
   TrackedPreferencesMigrationTest()
       : unprotected_prefs_(new base::DictionaryValue),
         protected_prefs_(new base::DictionaryValue),
         migration_modified_unprotected_store_(false),
         migration_modified_protected_store_(false),
         unprotected_store_migration_complete_(false),
         protected_store_migration_complete_(false) {}
 
   void SetUp() override {
-    PrefServiceHashStoreContents::RegisterPrefs(local_state_.registry());
     Reset();
   }
 
   void Reset() {
     std::set<std::string> unprotected_pref_names;
     std::set<std::string> protected_pref_names;
     unprotected_pref_names.insert(kUnprotectedPref);
     unprotected_pref_names.insert(kPreviouslyProtectedPref);
     protected_pref_names.insert(kProtectedPref);
     protected_pref_names.insert(kPreviouslyUnprotectedPref);
@@ skipping 15 matching lines @@
         base::Bind(
             &TrackedPreferencesMigrationTest::RegisterSuccessfulWriteClosure,
             base::Unretained(this), MOCK_UNPROTECTED_PREF_STORE),
         base::Bind(
             &TrackedPreferencesMigrationTest::RegisterSuccessfulWriteClosure,
             base::Unretained(this), MOCK_PROTECTED_PREF_STORE),
         std::unique_ptr<PrefHashStore>(
             new PrefHashStoreImpl(kSeed, kDeviceId, false)),
         std::unique_ptr<PrefHashStore>(
             new PrefHashStoreImpl(kSeed, kDeviceId, true)),
-        std::unique_ptr<HashStoreContents>(
-            new PrefServiceHashStoreContents(kHashStoreId, &local_state_)),
-
         &mock_unprotected_pref_filter_, &mock_protected_pref_filter_);
 
     // Verify initial expectations are met.
     EXPECT_TRUE(HasPrefs(MOCK_UNPROTECTED_PREF_STORE));
     EXPECT_TRUE(HasPrefs(MOCK_PROTECTED_PREF_STORE));
     EXPECT_FALSE(
         WasOnSuccessfulWriteCallbackRegistered(MOCK_UNPROTECTED_PREF_STORE));
     EXPECT_FALSE(
         WasOnSuccessfulWriteCallbackRegistered(MOCK_PROTECTED_PREF_STORE));
   }
 
  protected:
   // Sets |key| to |value| in the test store identified by |store_id| before
   // migration begins. Also sets the corresponding hash in the same store.
   void PresetStoreValue(MockPrefStoreID store_id,
                         const std::string& key,
                         const std::string value) {
     PresetStoreValueOnly(store_id, key, value);
     PresetStoreValueHash(store_id, key, value);
   }
 
-  // Sets |key| to |value| in the test store identified by |store_id| before
-  // migration begins. Stores the value hash in Local State as in M36 and
-  // earlier.
-  void PresetLegacyStoreValue(MockPrefStoreID store_id,
-                              const std::string& key,
-                              const std::string value) {
-    PresetStoreValueOnly(store_id, key, value);
-    PresetLegacyValueHash(key, value);
-  }
-
   // Stores a hash for |key| and |value| in the hash store identified by
   // |store_id| before migration begins.
   void PresetStoreValueHash(MockPrefStoreID store_id,
                             const std::string& key,
                             const std::string value) {
     base::DictionaryValue* store = NULL;
     std::unique_ptr<PrefHashStore> pref_hash_store;
     switch (store_id) {
       case MOCK_UNPROTECTED_PREF_STORE:
         store = unprotected_prefs_.get();
         pref_hash_store.reset(new PrefHashStoreImpl(kSeed, kDeviceId, false));
         break;
       case MOCK_PROTECTED_PREF_STORE:
         store = protected_prefs_.get();
         pref_hash_store.reset(new PrefHashStoreImpl(kSeed, kDeviceId, true));
         break;
     }
     DCHECK(store);
 
     base::StringValue string_value(value);
     pref_hash_store
         ->BeginTransaction(std::unique_ptr<HashStoreContents>(
             new DictionaryHashStoreContents(store)))
         ->StoreHash(key, &string_value);
   }
 
-  // Stores a hash for |key| and |value| in the legacy hash store in
-  // local_state.
-  void PresetLegacyValueHash(const std::string& key,
-                             const std::string value) {
-    std::unique_ptr<PrefHashStore> pref_hash_store(
-        new PrefHashStoreImpl(kSeed, kDeviceId, true));
-
-    base::StringValue string_value(value);
-    PrefHashStoreImpl(kSeed, kDeviceId, true)
-        .BeginTransaction(std::unique_ptr<HashStoreContents>(
-            new PrefServiceHashStoreContents(kHashStoreId, &local_state_)))
-        ->StoreHash(key, &string_value);
-  }
-
   // Returns true if the store opposite to |store_id| is observed for its next
   // successful write.
   bool WasOnSuccessfulWriteCallbackRegistered(MockPrefStoreID store_id) {
     switch (store_id) {
       case MOCK_UNPROTECTED_PREF_STORE:
         return !protected_store_successful_write_callback_.is_null();
       case MOCK_PROTECTED_PREF_STORE:
         return !unprotected_store_successful_write_callback_.is_null();
     }
     NOTREACHED();
@@ skipping 38 matching lines @@
         break;
     }
     DCHECK(store);
     const base::DictionaryValue* hash_store_contents =
         DictionaryHashStoreContents(store).GetContents();
     return hash_store_contents &&
            hash_store_contents->GetString(expected_pref_in_hash_store,
                                           static_cast<std::string*>(NULL));
   }
 
-  // Determines whether |expected_pref_in_hash_store| has a hash in the Local
-  // State hash store.
-  bool ContainsLegacyHash(const std::string& expected_pref_in_hash_store) {
-    const base::DictionaryValue* hash_store_contents =
-        PrefServiceHashStoreContents(kHashStoreId, &local_state_).GetContents();
-    return hash_store_contents &&
-           hash_store_contents->GetString(expected_pref_in_hash_store,
-                                          static_cast<std::string*>(NULL));
-  }
-
   // Both stores need to hand their prefs over in order for migration to kick
   // in.
   void HandPrefsToMigrator(MockPrefStoreID store_id) {
     switch (store_id) {
       case MOCK_UNPROTECTED_PREF_STORE:
         mock_unprotected_pref_filter_.FilterOnLoad(
             base::Bind(&TrackedPreferencesMigrationTest::GetPrefsBack,
                        base::Unretained(this), MOCK_UNPROTECTED_PREF_STORE),
             std::move(unprotected_prefs_));
         break;
@@ skipping 197 matching lines @@
       std::make_pair(kProtectedPref, kProtectedPrefValue));
   VerifyValuesStored(MOCK_PROTECTED_PREF_STORE, expected_protected_values);
 
   EXPECT_TRUE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref));
   EXPECT_FALSE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kProtectedPref));
 
   EXPECT_TRUE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kProtectedPref));
   EXPECT_FALSE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kUnprotectedPref));
 }
 
-TEST_F(TrackedPreferencesMigrationTest, LegacyHashMigrationOnly) {
-  PresetLegacyStoreValue(
-      MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref, kUnprotectedPrefValue);
-  PresetLegacyStoreValue(
-      MOCK_PROTECTED_PREF_STORE, kProtectedPref, kProtectedPrefValue);
-
-  EXPECT_FALSE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kProtectedPref));
-
-  EXPECT_FALSE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kProtectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kUnprotectedPref));
-
-  EXPECT_TRUE(ContainsLegacyHash(kProtectedPref));
-  EXPECT_TRUE(ContainsLegacyHash(kUnprotectedPref));
-
-  // Hand unprotected prefs to the migrator which should wait for the protected
-  // prefs.
-  HandPrefsToMigrator(MOCK_UNPROTECTED_PREF_STORE);
-  EXPECT_FALSE(HasPrefs(MOCK_UNPROTECTED_PREF_STORE));
-  EXPECT_TRUE(HasPrefs(MOCK_PROTECTED_PREF_STORE));
-  EXPECT_FALSE(MigrationCompleted());
-
-  // Hand protected prefs to the migrator which should proceed with the
-  // migration synchronously.
-  HandPrefsToMigrator(MOCK_PROTECTED_PREF_STORE);
-  EXPECT_TRUE(MigrationCompleted());
-
-  // Prefs should have been handed back over.
-  EXPECT_TRUE(HasPrefs(MOCK_UNPROTECTED_PREF_STORE));
-  EXPECT_TRUE(HasPrefs(MOCK_PROTECTED_PREF_STORE));
-
-  // There is no pending cleanup task for the modern hash stores.
-  EXPECT_FALSE(
-      WasOnSuccessfulWriteCallbackRegistered(MOCK_UNPROTECTED_PREF_STORE));
-  EXPECT_FALSE(
-      WasOnSuccessfulWriteCallbackRegistered(MOCK_PROTECTED_PREF_STORE));
-
-  // Both stores were modified as hashes were moved from Local State.
-  EXPECT_TRUE(StoreModifiedByMigration(MOCK_UNPROTECTED_PREF_STORE));
-  EXPECT_TRUE(StoreModifiedByMigration(MOCK_PROTECTED_PREF_STORE));
-
-  base::StringPairs expected_unprotected_values;
-  expected_unprotected_values.push_back(
-      std::make_pair(kUnprotectedPref, kUnprotectedPrefValue));
-  VerifyValuesStored(MOCK_UNPROTECTED_PREF_STORE, expected_unprotected_values);
-
-  base::StringPairs expected_protected_values;
-  expected_protected_values.push_back(
-      std::make_pair(kProtectedPref, kProtectedPrefValue));
-  VerifyValuesStored(MOCK_PROTECTED_PREF_STORE, expected_protected_values);
-
-  EXPECT_TRUE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kProtectedPref));
-
-  EXPECT_TRUE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kProtectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kUnprotectedPref));
-
-  // The Local State hash store will not be reset until the next run.
-  EXPECT_TRUE(ContainsLegacyHash(kProtectedPref));
-  EXPECT_TRUE(ContainsLegacyHash(kUnprotectedPref));
-
-  Reset();
-
-  HandPrefsToMigrator(MOCK_UNPROTECTED_PREF_STORE);
-  HandPrefsToMigrator(MOCK_PROTECTED_PREF_STORE);
-  EXPECT_TRUE(MigrationCompleted());
-
-  // Neither store was modified.
-  EXPECT_FALSE(StoreModifiedByMigration(MOCK_UNPROTECTED_PREF_STORE));
-  EXPECT_FALSE(StoreModifiedByMigration(MOCK_PROTECTED_PREF_STORE));
-
-  EXPECT_TRUE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kProtectedPref));
-
-  EXPECT_TRUE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kProtectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kUnprotectedPref));
-
-  EXPECT_FALSE(ContainsLegacyHash(kProtectedPref));
-  EXPECT_FALSE(ContainsLegacyHash(kUnprotectedPref));
-}
-
-TEST_F(TrackedPreferencesMigrationTest, FullMigrationWithLegacyHashStore) {
-  // Store some values with matching MACs in Local State.
-  PresetLegacyStoreValue(
-      MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref, kUnprotectedPrefValue);
-  PresetLegacyStoreValue(MOCK_UNPROTECTED_PREF_STORE,
-                         kPreviouslyUnprotectedPref,
-                         kPreviouslyUnprotectedPrefValue);
-  PresetLegacyStoreValue(
-      MOCK_PROTECTED_PREF_STORE, kProtectedPref, kProtectedPrefValue);
-  PresetLegacyStoreValue(MOCK_PROTECTED_PREF_STORE,
-                         kPreviouslyProtectedPref,
-                         kPreviouslyProtectedPrefValue);
-
-  // Verify that there are no MACs in Preferences or Secure Preferences.
-  EXPECT_FALSE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref));
-  EXPECT_FALSE(
-      ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kPreviouslyUnprotectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kProtectedPref));
-  EXPECT_FALSE(
-      ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kPreviouslyProtectedPref));
-
-  EXPECT_FALSE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kUnprotectedPref));
-  EXPECT_FALSE(
-      ContainsHash(MOCK_PROTECTED_PREF_STORE, kPreviouslyUnprotectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kProtectedPref));
-  EXPECT_FALSE(
-      ContainsHash(MOCK_PROTECTED_PREF_STORE, kPreviouslyProtectedPref));
-
-  // Verify that there are MACs in Local State.
-  EXPECT_TRUE(ContainsLegacyHash(kUnprotectedPref));
-  EXPECT_TRUE(ContainsLegacyHash(kPreviouslyUnprotectedPref));
-  EXPECT_TRUE(ContainsLegacyHash(kProtectedPref));
-  EXPECT_TRUE(ContainsLegacyHash(kPreviouslyProtectedPref));
-
-  // Perform a first-pass migration.
-  HandPrefsToMigrator(MOCK_UNPROTECTED_PREF_STORE);
-  HandPrefsToMigrator(MOCK_PROTECTED_PREF_STORE);
-  EXPECT_TRUE(MigrationCompleted());
-
-  // All values should have been moved to their preferred locations, including
-  // MACs.
-  base::StringPairs expected_unprotected_values;
-  expected_unprotected_values.push_back(
-      std::make_pair(kUnprotectedPref, kUnprotectedPrefValue));
-  expected_unprotected_values.push_back(
-      std::make_pair(kPreviouslyProtectedPref, kPreviouslyProtectedPrefValue));
-  base::StringPairs expected_protected_values;
-  expected_protected_values.push_back(
-      std::make_pair(kProtectedPref, kProtectedPrefValue));
-  expected_protected_values.push_back(std::make_pair(
-      kPreviouslyUnprotectedPref, kPreviouslyUnprotectedPrefValue));
-
-  VerifyValuesStored(MOCK_UNPROTECTED_PREF_STORE, expected_unprotected_values);
-  VerifyValuesStored(MOCK_PROTECTED_PREF_STORE, expected_protected_values);
-
-  EXPECT_TRUE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref));
-  EXPECT_TRUE(
-      ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kPreviouslyProtectedPref));
-  EXPECT_TRUE(
-      ContainsHash(MOCK_PROTECTED_PREF_STORE, kPreviouslyUnprotectedPref));
-  EXPECT_TRUE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kProtectedPref));
-
-  EXPECT_FALSE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kProtectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kUnprotectedPref));
-
-  EXPECT_FALSE(
-      ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kPreviouslyUnprotectedPref));
-  EXPECT_FALSE(
-      ContainsHash(MOCK_PROTECTED_PREF_STORE, kPreviouslyProtectedPref));
-
-  // Removing the values from their previous locations is deferred until the new
-  // locations are persisted.
-  EXPECT_TRUE(ContainsLegacyHash(kUnprotectedPref));
-  EXPECT_TRUE(ContainsLegacyHash(kPreviouslyUnprotectedPref));
-  EXPECT_TRUE(ContainsLegacyHash(kProtectedPref));
-  EXPECT_TRUE(ContainsLegacyHash(kPreviouslyProtectedPref));
-
-  EXPECT_TRUE(
-      WasOnSuccessfulWriteCallbackRegistered(MOCK_UNPROTECTED_PREF_STORE));
-  EXPECT_TRUE(
-      WasOnSuccessfulWriteCallbackRegistered(MOCK_PROTECTED_PREF_STORE));
-
-  SimulateSuccessfulWrite(MOCK_UNPROTECTED_PREF_STORE);
-  SimulateSuccessfulWrite(MOCK_PROTECTED_PREF_STORE);
-
-  Reset();
-
-  HandPrefsToMigrator(MOCK_UNPROTECTED_PREF_STORE);
-  HandPrefsToMigrator(MOCK_PROTECTED_PREF_STORE);
-  EXPECT_TRUE(MigrationCompleted());
-
-  // In this run the MACs should have been removed from their previous
-  // locations. There is no more pending action.
-  EXPECT_FALSE(
-      WasOnSuccessfulWriteCallbackRegistered(MOCK_UNPROTECTED_PREF_STORE));
-  EXPECT_FALSE(
-      WasOnSuccessfulWriteCallbackRegistered(MOCK_PROTECTED_PREF_STORE));
-
-  EXPECT_TRUE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref));
-  EXPECT_FALSE(
-      ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kPreviouslyUnprotectedPref));
-  EXPECT_FALSE(ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kProtectedPref));
-  EXPECT_TRUE(
-      ContainsHash(MOCK_UNPROTECTED_PREF_STORE, kPreviouslyProtectedPref));
-
-  EXPECT_FALSE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kUnprotectedPref));
-  EXPECT_TRUE(
-      ContainsHash(MOCK_PROTECTED_PREF_STORE, kPreviouslyUnprotectedPref));
-  EXPECT_TRUE(ContainsHash(MOCK_PROTECTED_PREF_STORE, kProtectedPref));
-  EXPECT_FALSE(
-      ContainsHash(MOCK_PROTECTED_PREF_STORE, kPreviouslyProtectedPref));
-
-  EXPECT_FALSE(ContainsLegacyHash(kUnprotectedPref));
-  EXPECT_FALSE(ContainsLegacyHash(kPreviouslyUnprotectedPref));
-  EXPECT_FALSE(ContainsLegacyHash(kProtectedPref));
-  EXPECT_FALSE(ContainsLegacyHash(kPreviouslyProtectedPref));
-
-  VerifyValuesStored(MOCK_UNPROTECTED_PREF_STORE, expected_unprotected_values);
-  VerifyValuesStored(MOCK_PROTECTED_PREF_STORE, expected_protected_values);
-}
-
 TEST_F(TrackedPreferencesMigrationTest, FullMigration) {
   PresetStoreValue(
       MOCK_UNPROTECTED_PREF_STORE, kUnprotectedPref, kUnprotectedPrefValue);
   PresetStoreValue(MOCK_UNPROTECTED_PREF_STORE,
                    kPreviouslyUnprotectedPref,
                    kPreviouslyUnprotectedPrefValue);
   PresetStoreValue(
       MOCK_PROTECTED_PREF_STORE, kProtectedPref, kProtectedPrefValue);
   PresetStoreValue(MOCK_PROTECTED_PREF_STORE,
                    kPreviouslyProtectedPref,
@@ skipping 194 matching lines @@
                        expected_unprotected_values);
 
     base::StringPairs expected_protected_values;
     expected_protected_values.push_back(std::make_pair(
         kProtectedPref, kProtectedPrefValue));
     expected_protected_values.push_back(std::make_pair(
         kPreviouslyUnprotectedPref, kPreviouslyUnprotectedPrefValue));
     VerifyValuesStored(MOCK_PROTECTED_PREF_STORE, expected_protected_values);
   }
 }