xref: /foundation/distributedhardware/distributed_camera/common/src/utils/anonymous_string.cpp

/*
 * Copyright (c) 2021 Huawei Device Co., Ltd.
 * 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.
 */

#include "anonymous_string.h"

#include <cstddef>
#include <iomanip>
#include <random>
#include <string>
#include <sstream>

#include "securec.h"

namespace OHOS {
namespace DistributedHardware {
constexpr int32_t WORD_WIDTH_8 = 8;
constexpr int32_t WORD_WIDTH_4 = 4;

std::string GetRandomID()
{
    static std::random_device rd;
    static std::uniform_int_distribution<uint64_t> dist(0ULL, 0xFFFFFFFFFFFFFFFFULL);
    uint64_t ab = dist(rd);
    uint64_t cd = dist(rd);
    uint32_t a, b, c, d;
    std::stringstream ss;
    ab = (ab & 0xFFFFFFFFFFFF0FFFULL) | 0x0000000000004000ULL;
    cd = (cd & 0x3FFFFFFFFFFFFFFFULL) | 0x8000000000000000ULL;
    a = (ab >> 32U);
    b = (ab & 0xFFFFFFFFU);
    c = (cd >> 32U);
    d = (cd & 0xFFFFFFFFU);
    ss << std::hex << std::nouppercase << std::setfill('0');
    ss << std::setw(WORD_WIDTH_8) << (a);
    ss << std::setw(WORD_WIDTH_4) << (b >> 16U);
    ss << std::setw(WORD_WIDTH_4) << (b & 0xFFFFU);
    ss << std::setw(WORD_WIDTH_4) << (c >> 16U);
    ss << std::setw(WORD_WIDTH_4) << (c & 0xFFFFU);
    ss << std::setw(WORD_WIDTH_8) << d;

    return ss.str();
}

std::string GetAnonyString(const std::string &value)
{
    constexpr size_t INT32_SHORT_ID_LENGTH = 20;
    constexpr size_t INT32_PLAINTEXT_LENGTH = 4;
    constexpr size_t INT32_MIN_ID_LENGTH = 3;
    std::string res;
    std::string tmpStr("******");
    size_t strLen = value.length();
    if (strLen < INT32_MIN_ID_LENGTH) {
        return tmpStr;
    }

    if (strLen <= INT32_SHORT_ID_LENGTH) {
        res += value[0];
        res += tmpStr;
        res += value[strLen - 1];
    } else {
        res.append(value, 0, INT32_PLAINTEXT_LENGTH);
        res += tmpStr;
        res.append(value, strLen - INT32_PLAINTEXT_LENGTH, INT32_PLAINTEXT_LENGTH);
    }

    return res;
}

std::string GetAnonyInt32(const int32_t value)
{
    constexpr int32_t INT32_STRING_LENGTH = 40;
    char tempBuffer[INT32_STRING_LENGTH] = "";
    int32_t secRet = sprintf_s(tempBuffer, INT32_STRING_LENGTH, "%d", value);
    if (secRet <= 0) {
        std::string nullString("");
        return nullString;
    }
    size_t length = strlen(tempBuffer);
    for (size_t i = 1; i <= length - 1; i++) {
        tempBuffer[i] = '*';
    }
    if (length == 0x01) {
        tempBuffer[0] = '*';
    }

    std::string tempString(tempBuffer);
    return tempString;
}
} // namespace DistributedHardware
} // namespace OHOS