| // Copyright (C) 2013 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| // An object to wrap data with a checksum and a timestamp. These fields are used |
| // to verify that the data is not stale or corrupted. Staleness threshold is 1 |
| // month. |
| |
| #ifndef I18N_ADDRESSINPUT_VALIDATING_UTIL_H_ |
| #define I18N_ADDRESSINPUT_VALIDATING_UTIL_H_ |
| |
| #include <ctime> |
| #include <string> |
| |
| namespace i18n { |
| namespace addressinput { |
| |
| // Wraps data with a checksum and a timestamp. Sample usage: |
| // std::string data = ... |
| // std::string wrapped = ValidatingUtil::Wrap(data, time(NULL)); |
| // Process(wrapped); |
| // |
| // std::string unwrapped = wrapped; |
| // if (ValidatingUtil::UnwrapTimestamp(&unwrapped, time(NULL)) && |
| // ValidatingUtil::UnwrapChecksum(&unwrapped)) { |
| // Process(unwrapped); |
| // } |
| class ValidatingUtil { |
| public: |
| // Returns |data| with attached checksum and given |timestamp|. |
| static std::string Wrap(const std::string& data, time_t timestamp); |
| |
| // Strips out the timestamp from |data|. Returns |true| if the timestamp is |
| // present, formatted correctly, valid, and recent with respect to |now|. |
| static bool UnwrapTimestamp(std::string* data, time_t now); |
| |
| // Strips out the checksum from |data|. Returns |true| if the checksum is |
| // present, formatted correctly, and valid for this data. |
| static bool UnwrapChecksum(std::string* data); |
| }; |
| |
| } // namespace addressinput |
| } // namespace i18n |
| |
| #endif // I18N_ADDRESSINPUT_VALIDATING_UTIL_H_ |