| // 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. |
| |
| #ifndef CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_SEED_STORE_H_ |
| #define CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_SEED_STORE_H_ |
| |
| #include <string> |
| |
| #include "base/compiler_specific.h" |
| #include "base/gtest_prod_util.h" |
| #include "base/time/time.h" |
| |
| class PrefService; |
| class PrefRegistrySimple; |
| |
| namespace variations { |
| class VariationsSeed; |
| } |
| |
| namespace chrome_variations { |
| |
| // VariationsSeedStore is a helper class for reading and writing the variations |
| // seed from Local State. |
| class VariationsSeedStore { |
| public: |
| explicit VariationsSeedStore(PrefService* local_state); |
| virtual ~VariationsSeedStore(); |
| |
| // Loads the variations seed data from local state into |seed|. If there is a |
| // problem with loading, the pref value is cleared and false is returned. If |
| // successful, |seed| will contain the loaded data and true is returned. |
| bool LoadSeed(variations::VariationsSeed* seed); |
| |
| // Stores the given seed data (serialized protobuf data) to local state, along |
| // with a base64-encoded digital signature for seed and the date when it was |
| // fetched. The |seed_data| will be base64 encoded for storage. If the string |
| // is invalid, the existing prefs are left as is and false is returned. On |
| // success and if |parsed_seed| is not NULL, |parsed_seed| will be filled |
| // with the de-serialized protobuf decoded from |seed_data|. |
| bool StoreSeedData(const std::string& seed_data, |
| const std::string& base64_seed_signature, |
| const base::Time& date_fetched, |
| variations::VariationsSeed* parsed_seed); |
| |
| // Updates |kVariationsSeedDate| and logs when previous date was from a |
| // different day. |
| void UpdateSeedDateAndLogDayChange(const base::Time& server_date_fetched); |
| |
| // Returns the serial number of the last loaded or stored seed. |
| const std::string& variations_serial_number() const { |
| return variations_serial_number_; |
| } |
| |
| // Registers Local State prefs used by this class. |
| static void RegisterPrefs(PrefRegistrySimple* registry); |
| |
| protected: |
| // Note: UMA histogram enum - don't re-order or remove entries. |
| enum VerifySignatureResult { |
| VARIATIONS_SEED_SIGNATURE_MISSING, |
| VARIATIONS_SEED_SIGNATURE_DECODE_FAILED, |
| VARIATIONS_SEED_SIGNATURE_INVALID_SIGNATURE, |
| VARIATIONS_SEED_SIGNATURE_INVALID_SEED, |
| VARIATIONS_SEED_SIGNATURE_VALID, |
| VARIATIONS_SEED_SIGNATURE_ENUM_SIZE, |
| }; |
| |
| // Verifies a variations seed (the serialized proto bytes) with the specified |
| // base-64 encoded signature that was received from the server and returns the |
| // result. The signature is assumed to be an "ECDSA with SHA-256" signature |
| // (see kECDSAWithSHA256AlgorithmID in the .cc file). Returns the result of |
| // signature verification or VARIATIONS_SEED_SIGNATURE_ENUM_SIZE if signature |
| // verification is not enabled. |
| virtual VariationsSeedStore::VerifySignatureResult VerifySeedSignature( |
| const std::string& seed_bytes, |
| const std::string& base64_seed_signature); |
| |
| private: |
| FRIEND_TEST_ALL_PREFIXES(VariationsSeedStoreTest, VerifySeedSignature); |
| |
| // Clears all prefs related to variations seed storage. |
| void ClearPrefs(); |
| |
| // The pref service used to persist the variations seed. |
| PrefService* local_state_; |
| |
| // Cached serial number from the most recently fetched variations seed. |
| std::string variations_serial_number_; |
| |
| DISALLOW_COPY_AND_ASSIGN(VariationsSeedStore); |
| }; |
| |
| } // namespace chrome_variations |
| |
| #endif // CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_SEED_STORE_H_ |