axmol/cocos/base/CCUserDefault.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
Copyright (c) 2017-2020 c4games.com.
Copyright (c) 2021 Bytedance Inc.

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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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****************************************************************************/
#if defined(_WIN32)
#include <io.h>
#include <direct.h>
#else
#include <unistd.h>
#include <errno.h>
#endif
#include <fcntl.h>
#include <sys/stat.h>

#include <inttypes.h>
#include <sstream>

#include "openssl/aes.h"
#include "openssl/modes.h"
#include "openssl/rc4.h"

#include "base/CCUserDefault.h"
#include "platform/CCCommon.h"
#include "platform/CCFileUtils.h"
#include "pugixml/pugixml.hpp"
#include "base/base64.h"
#include "base/ccUtils.h"

#include "yasio/ibstream.hpp"
#include "yasio/obstream.hpp"
#include "yasio/detail/sz.hpp"

#include "CCPosixFileStream.h"

#define USER_DEFAULT_PLAIN_MODE 0

#if !USER_DEFAULT_PLAIN_MODE
#define USER_DEFAULT_FILENAME "UserDefault.bin"
#else
#define USER_DEFAULT_FILENAME "UserDefault.xml"
#endif

typedef int32_t udflen_t;

NS_CC_BEGIN

/**
 * implements of UserDefault
 */

UserDefault* UserDefault::_userDefault = nullptr;

static void ud_setkey(std::string& lhs, const cxx17::string_view& rhs) {
    static const size_t keyLen = 16;
    if (!rhs.empty()) {
        lhs.assign(rhs.data(), std::min(rhs.length(), keyLen));
        if (lhs.size() < keyLen)
            lhs.insert(lhs.end(), keyLen - lhs.size(), '\0'); // fill 0, if key insufficient
    }
    else
        lhs.assign(keyLen, '\0');
}

static void ud_write_v_s(UserDefault* ud, yasio::obstream& obs, const cxx17::string_view value) 
{
    size_t value_offset = obs.length();
    obs.write_v(value);
    value_offset += (obs.length() - value_offset - value.length());
    if(!value.empty())
        ud->encrypt(obs.data() + value_offset, value.length(), AES_ENCRYPT);
}

void UserDefault::setEncryptEnabled(bool enabled, cxx17::string_view key, cxx17::string_view iv)
{
    _encryptEnabled = enabled;
    if (_encryptEnabled) {
        ud_setkey(_key, key);
        ud_setkey(_iv, iv);
    }
}

void UserDefault::encrypt(std::string& inout, int enc)
{
    if (!inout.empty())
        encrypt(&inout.front(), inout.size(), enc);
}

void UserDefault::encrypt(char* inout, size_t size, int enc)
{
    if (size > 0) {
        AES_KEY aeskey;
        AES_set_encrypt_key((const unsigned char*)_key.c_str(), 128, &aeskey);

        unsigned char iv[16] = { 0 };
        memcpy(iv, _iv.c_str(), std::min(sizeof(iv), _iv.size()));

        int ignored_num = 0;
        AES_cfb128_encrypt((unsigned char*)inout, (unsigned char*)inout, size, &aeskey, iv, &ignored_num, enc);
    }
}

UserDefault::~UserDefault()
{
    closeFileMapping();
}

UserDefault::UserDefault()
{
}

void UserDefault::closeFileMapping()
{
    _rwmmap.reset();
#if !USER_DEFAULT_PLAIN_MODE
    if (_fd != -1) {
        posix_close(_fd);
        _fd = -1;
    }
#endif
}

bool UserDefault::getBoolForKey(const char* pKey)
{
 return getBoolForKey(pKey, false);
}

bool UserDefault::getBoolForKey(const char* pKey, bool defaultValue)
{
    auto pValue = getValueForKey(pKey);
    if (pValue)
        return *pValue == "true";

    return defaultValue;
}

int UserDefault::getIntegerForKey(const char* pKey)
{
    return getIntegerForKey(pKey, 0);
}

int UserDefault::getIntegerForKey(const char* pKey, int defaultValue)
{
    auto pValue = getValueForKey(pKey);
    if (pValue)
        return atoi(pValue->c_str());

    return defaultValue;
}

int64_t UserDefault::getLargeIntForKey(const char* key)
{
    return getLargeIntForKey(key, 0);
}

int64_t UserDefault::getLargeIntForKey(const char* key, int64_t defaultValue)
{
    auto pValue = getValueForKey(key);
    if (pValue)
        return std::stoll(pValue->c_str());

    return defaultValue;
}

float UserDefault::getFloatForKey(const char* pKey)
{
    return getFloatForKey(pKey, 0.0f);
}

float UserDefault::getFloatForKey(const char* pKey, float defaultValue)
{
    return static_cast<float>(getDoubleForKey(pKey, defaultValue));
}

double  UserDefault::getDoubleForKey(const char* pKey)
{
    return getDoubleForKey(pKey, 0.0);
}

double UserDefault::getDoubleForKey(const char* pKey, double defaultValue)
{
    auto pValue = getValueForKey(pKey);
    if (pValue)
        return utils::atof(pValue->c_str());

    return defaultValue;
}

std::string UserDefault::getStringForKey(const char* pKey)
{
    return getStringForKey(pKey, "");
}

std::string UserDefault::getStringForKey(const char* pKey, const std::string & defaultValue)
{
    auto pValue = getValueForKey(pKey);
    if (pValue)
        return *pValue;

    return defaultValue;
}

const std::string* UserDefault::getValueForKey(const std::string& key)
{
    // do lazyInit at here to make sure _encryptEnabled works well,
    lazyInit();

    auto it = this->_values.find(key);
    if (it != this->_values.end())
        return &it->second;
    return nullptr;
}

void UserDefault::setBoolForKey(const char* pKey, bool value)
{
    // save bool value as string
    setStringForKey(pKey, value ? "true" : "false");
}

void UserDefault::setIntegerForKey(const char* pKey, int value)
{
    // check key
    if (! pKey)
    {
        return;
    }

    // format the value
    char tmp[50];
    memset(tmp, 0, sizeof(tmp));
    sprintf(tmp, "%d", value);

    setStringForKey(pKey, tmp);
}

void UserDefault::setLargeIntForKey(const char* pKey, int64_t value)
{// check key
    if (!pKey)
    {
        return;
    }

    // format the value
    char tmp[96];
    memset(tmp, 0, sizeof(tmp));
    sprintf(tmp, "%" PRId64, value);

    setStringForKey(pKey, tmp);
}

void UserDefault::setFloatForKey(const char* pKey, float value)
{
    setDoubleForKey(pKey, value);
}

void UserDefault::setDoubleForKey(const char* pKey, double value)
{
    // check key
    if (! pKey)
    {
        return;
    }

    // format the value
    char tmp[50];
    memset(tmp, 0, 50);
    sprintf(tmp, "%f", value);

    setStringForKey(pKey, tmp);
}

void UserDefault::setStringForKey(const char* pKey, const std::string & value)
{
    // ignore empty key
    if (! pKey || !*pKey)
    {
        return;
    }

    setValueForKey(pKey, value);

#if !USER_DEFAULT_PLAIN_MODE
    if (_rwmmap) {
        yasio::obstream obs;
        if (_encryptEnabled)
        {
            ud_write_v_s(this, obs, pKey);
            ud_write_v_s(this, obs, value);
        }
        else {
            obs.write_v(pKey);
            obs.write_v(value);
        }

        if ((_realSize + obs.length() + sizeof(udflen_t)) < _curMapSize)
        { // fast append entity without flush
            // increase entities count
            yasio::obstream::swrite(_rwmmap->data(), 1 + yasio::ibstream::sread<udflen_t>(_rwmmap->data()));

            // append entity
            ::memcpy(_rwmmap->data() + sizeof(udflen_t) + _realSize, obs.data(), obs.length());
            _realSize += static_cast<int>(obs.length());
        }
        else {
            flush();
        }
    }
#else
    flush();
#endif
}

void UserDefault::setValueForKey(const std::string& key, const std::string& value)
{
    // do lazyInit at here to make sure _encryptEnabled works well
    lazyInit();

    updateValueForKey(key, value);
}

void UserDefault::updateValueForKey(const std::string& key, const std::string& value)
{
    auto it = _values.find(key);
    if (it != _values.end())
        it->second = value;
    else
        _values.emplace(key, value);
}

UserDefault* UserDefault::getInstance()
{
    if (_userDefault) return _userDefault;

    return ( _userDefault = new UserDefault() );
}

void UserDefault::destroyInstance()
{
    CC_SAFE_DELETE(_userDefault);
}

void UserDefault::setDelegate(UserDefault *delegate)
{
    if (_userDefault)
        delete _userDefault;

    _userDefault = delegate;
}

void UserDefault::lazyInit()
{
    if (_initialized) return;

#if !USER_DEFAULT_PLAIN_MODE
    _filePath = FileUtils::getInstance()->getNativeWritableAbsolutePath() + USER_DEFAULT_FILENAME;

    // construct file mapping
    _fd = posix_open(_filePath.c_str(), O_OVERLAP_FLAGS);
    if (_fd == -1) {
        log("[Warnning] UserDefault::init open storage file '%s' failed!", _filePath.c_str());
        return;
    }

    int filesize = static_cast<int>(posix_lseek64(_fd, 0, SEEK_END));
    posix_lseek64(_fd, 0, SEEK_SET);

    if (filesize < _curMapSize) { // construct a empty file mapping
        posix_fsetsize(_fd, _curMapSize);
        _rwmmap = std::make_shared<mio::mmap_sink>(posix_fd2fh(_fd), 0, _curMapSize);
    }
    else { /// load to memory _values
        _rwmmap = std::make_shared<mio::mmap_sink>(posix_fd2fh(_fd), 0, mio::map_entire_file);
        if (_rwmmap->is_mapped()) { // no error
            yasio::ibstream_view ibs(_rwmmap->data(), _rwmmap->length());

            if (ibs.length() > 0) {
                // read count of keyvals.
                int count = ibs.read<int>();
                for (auto i = 0; i < count; ++i) {
                    std::string key(ibs.read_v());
                    std::string value(ibs.read_v());
                    if (_encryptEnabled)
                    {
                        this->encrypt(key, AES_DECRYPT);
                        this->encrypt(value, AES_DECRYPT);
                    }
                    updateValueForKey(key, value);
                }
                _realSize = static_cast<int>(ibs.seek(0, SEEK_CUR) - sizeof(udflen_t));
            }
        }
        else {
            closeFileMapping();
            ::remove(_filePath.c_str());
            log("[Warnning] UserDefault::init map file '%s' failed, we can't save data persisit this time, next time we will retry!", _filePath.c_str());
        }
    }
#else
    pugi::xml_document doc;

    _filePath = FileUtils::getInstance()->getWritablePath() + USER_DEFAULT_FILENAME;

    if (FileUtils::getInstance()->isFileExist(_filePath))
    {
        auto data = FileUtils::getInstance()->getDataFromFile(_filePath);
        pugi::xml_parse_result ret = doc.load_buffer_inplace(data.getBytes(), data.getSize());
        if (ret) {
            for (auto& elem : doc.document_element())
                updateValueForKey(elem.name(), elem.text().as_string());
        }
        else {
            log("UserDefault::init load xml file: %s failed, %s", _filePath.c_str(), ret.description());
        }
    }

#endif

    _initialized = true;
}

void UserDefault::flush()
{
#if !USER_DEFAULT_PLAIN_MODE
    if (_rwmmap) {
        yasio::obstream obs;
        obs.write<int>(static_cast<int>(this->_values.size()));
        for (auto& item : this->_values) {
            if (_encryptEnabled)
            {
                ud_write_v_s(this, obs, item.first);
                ud_write_v_s(this, obs, item.second);
            }
            else {
                obs.write_v(item.first);
                obs.write_v(item.second);
            }
        }

        std::error_code error;
        if (obs.length() > _curMapSize) {
            _rwmmap->unmap();
            _curMapSize <<= 1; // X2
            posix_fsetsize(_fd, _curMapSize);
            _rwmmap->map(posix_fd2fh(_fd), 0, _curMapSize, error);
        }

        if (!error && _rwmmap->is_mapped())
        { // mapping status is good
            ::memcpy(_rwmmap->data(), obs.data(), obs.length());
            _realSize = static_cast<int>(obs.length() - sizeof(udflen_t));
        }
        else {
            // close file mapping and do a simple workaround fix to don't do persist later at this time
            closeFileMapping();
            ::remove(_filePath.c_str());
        }
    }
#else
    pugi::xml_document doc;
    doc.load_string(R"(<?xml version="1.0" ?>
<r />)");
    auto r = doc.document_element();
    for(auto& kv : _values)
        r.append_child(kv.first.c_str())
        .append_child(pugi::xml_node_type::node_pcdata)
        .set_value(kv.second.c_str());

    std::stringstream ss;
    doc.save(ss, "  ");
    FileUtils::getInstance()->writeStringToFile(ss.str(), _filePath);
#endif
}

void UserDefault::deleteValueForKey(const char* key)
{
    if(this->_values.erase(key) > 0)
        flush();
}

NS_CC_END