1 /* 2 * Copyright (c) 2024 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef OHOS_PREFERENCES_ANONYMOUS_H 17 #define OHOS_PREFERENCES_ANONYMOUS_H 18 19 #include <string> 20 21 namespace OHOS { 22 namespace NativePreferences { 23 class Anonymous { 24 public: ToBeAnonymous(const std::string & data)25 static std::string ToBeAnonymous(const std::string &data) 26 { 27 if (data.size() <= HEAD_SIZE) { 28 return DEFAULT_ANONYMOUS; 29 } 30 if (data.size() < MIN_SIZE) { 31 return (data.substr(0, HEAD_SIZE) + REPLACE_CHAIN); 32 } 33 if (data.size() < MEDIAN_SIZE) { 34 return (data.substr(0, HEAD_SIZE) + REPLACE_CHAIN + data.substr(data.size() - END_SIZE, END_SIZE)); 35 } 36 return (data.substr(0, DATA_HEAD) + REPLACE_CHAIN + data.substr(data.size() - DATA_END, DATA_END)); 37 } 38 39 private: 40 static constexpr size_t HEAD_SIZE = 3; 41 static constexpr size_t END_SIZE = 3; 42 static constexpr size_t DATA_HEAD = 4; 43 static constexpr size_t DATA_END = 4; 44 static constexpr size_t MIN_SIZE = HEAD_SIZE + END_SIZE + 3; 45 static constexpr size_t MEDIAN_SIZE = DATA_HEAD + DATA_END + 3; 46 static constexpr const char *REPLACE_CHAIN = "***"; 47 static constexpr const char *DEFAULT_ANONYMOUS = "******"; 48 }; 49 } // namespace NativePreferences 50 } // namespace OHOS 51 #endif // OHOS_PREFERENCES_ANONYMOUS_H 52 53