C++ 字符串处理5-手机号邮箱如何脱敏处理

#pragma once

#include <string>

namespace cutl
{
    /**
     * @brief Desensitizing a string by replacing some characters with '*'.
     *
     * @param str the string to be desensitized.
     * @return std::string the desensitized string.
     */
    std::string desensitizing(const std::string &str);
} // namespace cutl

#include <cctype>
#include <algorithm>
#include "strutil.h"

namespace cutl
{
    // 字符串脱敏处理
    std::string desensitizing(const std::string &str)
    {
        std::string result;
        // 只打印前1/4和后1/4的内容，中间用*表示
        if (str.empty())
        {
            result = "";
        }
        else if (str.length() == 1)
        {
            result = "*";
        }
        else if (str.length() == 2)
        {
            result = str.substr(0, 1) + std::string(str.length() - 1, '*');
        }
        else if (str.length() <= 6)
        {
            result = str.substr(0, 2) + std::string(str.length() - 2, '*');
        }
        else if (str.length() < 10)
        {
            result = str.substr(0, 2) + std::string(str.length() - 4, '*') + str.substr(str.length() - 2, 2);
        }
        else if (str.length() < 16)
        {
            // 长度控制在最长12位，中间×不超过6
            auto startCount = (str.length() - 6) > 6 ? 6 : (str.length() - 6);
            result = str.substr(0, 3) + std::string(startCount, '*') + str.substr(str.length() - 3, 3);
        }
        else
        {
            // 长度控制在最长12位
            result = str.substr(0, 4) + std::string(4, '*') + str.substr(str.length() - 4, 4);
        }
        return result;
    }
} // namespace cutl

#include "common.hpp"
#include "strutil.h"

void TestDesensitizing()
{
    PrintSubTitle("desensitizing");

    std::string password = "2515774";
    std::cout << "password: " << cutl::desensitizing(password) << std::endl;
    std::string phone = "18500425678";
    std::cout << "phone: " << cutl::desensitizing(phone) << std::endl;
}