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 #include "b_anony/b_anony.h"
17
18 #include "securec.h"
19
20 namespace OHOS::FileManagement::Backup {
21 using namespace std;
22
GetAnonyString(const std::string & value)23 std::string GetAnonyString(const std::string &value)
24 {
25 const size_t shortPlaintextLength = 20; // 字符串长度小于20，只明文1字节
26 const size_t plaintextLength = 4; // 字符串长度大于20，明文4字节
27 const size_t anonyLength = 3; // 字符串长度小于3, 则完全匿名
28 std::string result;
29 std::string tmpStr("******");
30 size_t strLen = value.length();
31 if (strLen < anonyLength) {
32 return tmpStr;
33 }
34
35 if (strLen <= shortPlaintextLength) {
36 result += value[0];
37 result += tmpStr;
38 result += value[strLen - 1];
39 } else {
40 result += value.substr(0, plaintextLength);
41 result += tmpStr;
42 result += value.substr(strLen - plaintextLength, plaintextLength);
43 }
44
45 return result;
46 }
47
GetAnonyPath(const std::string & value)48 std::string GetAnonyPath(const std::string &value)
49 {
50 std::string res;
51 size_t pos = 0;
52 size_t found = value.find('/');
53 while (found != std::string::npos) {
54 if (pos != found) {
55 res += GetAnonyString(value.substr(pos, found - pos));
56 }
57 res += '/';
58 pos = found + 1;
59 found = value.find('/', pos);
60 }
61 //处理文件名
62 if (pos < value.length()) {
63 found = value.find('.', pos);
64 if (found != std::string::npos) {
65 res += GetAnonyString(value.substr(pos, found - pos));
66 res += value.substr(found);
67 } else {
68 res += GetAnonyString(value.substr(pos));
69 }
70 }
71 return res;
72 }
73 }