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1 /*
2  * Copyright (c) 2021-2022 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 WHITE_LIST_UTIL_H
17 #define WHITE_LIST_UTIL_H
18 
19 #include <mutex>
20 #include <unordered_set>
21 
22 #include "constants_dinput.h"
23 
24 namespace OHOS {
25 namespace DistributedHardware {
26 namespace DistributedInput {
27 using TYPE_KEY_CODE_VEC = std::vector<int32_t>;
28 using TYPE_COMBINATION_KEY_VEC = std::vector<TYPE_KEY_CODE_VEC>;
29 using TYPE_WHITE_LIST_VEC = std::vector<TYPE_COMBINATION_KEY_VEC>;
30 using TYPE_DEVICE_WHITE_LIST_MAP = std::map<std::string, TYPE_WHITE_LIST_VEC>;
31 
32 struct WhiteListItemHash {
33     std::string hash;
34 
35     // the keys num
36     int32_t len;
37 
WhiteListItemHashWhiteListItemHash38     WhiteListItemHash() : hash(""), len(0) {}
39 
WhiteListItemHashWhiteListItemHash40     WhiteListItemHash(std::string &hash, int32_t len) : hash(hash), len(len) {}
41 };
42 
43 class WhiteListUtil {
44 public:
45     static WhiteListUtil &GetInstance(void);
46     int32_t SyncWhiteList(const std::string &deviceId, const TYPE_WHITE_LIST_VEC &vecWhiteList);
47     int32_t ClearWhiteList(const std::string &deviceId);
48     int32_t ClearWhiteList(void);
49     int32_t GetWhiteList(const std::string &deviceId, TYPE_WHITE_LIST_VEC &vecWhiteList);
50 
51     /*
52      * check is event in white list of deviceId
53      *
54      * Return:
55      *   true: event in white list of this device
56      *   false: event not in white list of this device, or white list of this device not exist
57      */
58     bool IsNeedFilterOut(const std::string &deviceId, const BusinessEvent &event);
59 private:
60     int32_t Init();
61     WhiteListUtil();
62     ~WhiteListUtil();
63     WhiteListUtil(const WhiteListUtil &other) = delete;
64     const WhiteListUtil &operator=(const WhiteListUtil &other) = delete;
65     void ReadLineDataStepOne(std::string &column, TYPE_KEY_CODE_VEC &vecKeyCode,
66         TYPE_COMBINATION_KEY_VEC &vecCombinationKey) const;
67     void GetCombKeysHash(TYPE_COMBINATION_KEY_VEC combKeys, std::unordered_set<std::string> &targetSet);
68     void GetAllComb(TYPE_COMBINATION_KEY_VEC vecs, WhiteListItemHash hash,
69         int32_t targetLen, std::unordered_set<std::string> &hashSets);
70     std::string GetBusinessEventHash(const BusinessEvent &event);
71     bool IsValidLine(const std::string &line) const;
72     bool CheckIsNumber(const std::string &str) const;
73     void SplitCombinationKey(std::string &line, TYPE_KEY_CODE_VEC &vecKeyCode,
74         TYPE_COMBINATION_KEY_VEC &vecCombinationKey) const;
75 private:
76     TYPE_DEVICE_WHITE_LIST_MAP mapDeviceWhiteList_;
77     std::map<std::string, std::unordered_set<std::string>> combKeysHashMap_;
78     std::mutex mutex_;
79 };
80 } // namespace DistributedInput
81 } // namespace DistributedHardware
82 } // namespace OHOS
83 
84 #endif // WHITE_LIST_UTIL_H
85