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.

http://www.cocos2d-x.org

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of this software and associated documentation files (the "Software"), to deal
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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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 "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 "CCFileStream.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(yasio::obstream& obs, const cxx17::string_view value) 
{
    size_t valpos = obs.length();
    obs.write_v(value);
    if(!value.empty())
        UserDefault::getInstance()->encrypt(obs.wptr(valpos + sizeof(int32_t)), obs.length() - valpos - sizeof(int32_t), AES_ENCRYPT);
}

void UserDefault::setEncryptEnabled(bool enabled, const cxx17::string_view& key, const 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 (_fd != -1) {
        posix_close(_fd);
        _fd = -1;
    }
}

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

bool UserDefault::getBoolForKey(const char* pKey, bool defaultValue)
{
    auto it = this->_values.find(pKey);
    if (it != this->_values.end())
        return it->second == "true";

    return defaultValue;
}

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

int UserDefault::getIntegerForKey(const char* pKey, int defaultValue)
{
    auto it = this->_values.find(pKey);
    if (it != this->_values.end())
        return atoi(it->second.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 it = this->_values.find(key);
    if (it != this->_values.end())
        return std::stoll(it->second);

    return defaultValue;
}

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

float UserDefault::getFloatForKey(const char* pKey, float defaultValue)
{
    float ret = (float)getDoubleForKey(pKey, (double)defaultValue);
 
    return ret;
}

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

double UserDefault::getDoubleForKey(const char* pKey, double defaultValue)
{
    auto it = this->_values.find(pKey);
    if (it != this->_values.end())
        return utils::atof(it->second.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 it = this->_values.find(pKey);
    if (it != this->_values.end())
        return it->second;

    return defaultValue;
}

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(obs, pKey);
            ud_write_v_s(obs, value);
        }
        else {
            obs.write_v(pKey);
            obs.write_v(value);
        }

        if ((_realSize + obs.length() + sizeof(udflen_t)) < _curMapSize)
        {
            // increase entities count
            yasio::obstream::swrite_i(_rwmmap->data(), 1 + yasio::ibstream::sread_i<udflen_t>(_rwmmap->data()));

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

void UserDefault::setValueForKey(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)
    {
        _userDefault = new (std::nothrow) UserDefault();
        _userDefault->init();
    }

    return _userDefault;
}

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

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

    _userDefault = delegate;
}

void UserDefault::init()
{
    if (! _initialized)
    {
        _filePath = FileUtils::getInstance()->getWritablePath() + USER_DEFAULT_FILENAME;

#if !USER_DEFAULT_PLAIN_MODE
        // 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 = posix_lseek(_fd, 0, SEEK_END);
        posix_lseek(_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_i<int>();
                    for (auto i = 0; i < count; ++i) {
                        std::string key(ibs.read_v());
                        std::string value(ibs.read_v());
                        if (_encryptEnabled)
                        {
                            UserDefault::encrypt(key, AES_DECRYPT);
                            UserDefault::encrypt(value, AES_DECRYPT);
                        }
                        setValueForKey(key, value);
                    }
                    _realSize = 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;
        pugi::xml_parse_result ret = doc.load_file(_filePath.c_str());
        if (ret) {
            for (auto& elem : doc.document_element())
                setValueForKey(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_i<int>(static_cast<int>(this->_values.size()));
        for (auto& item : this->_values) {
            if (_encryptEnabled)
            {
                ud_write_v_s(obs, item.first);
                ud_write_v_s(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 = 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());
    doc.save_file(_filePath.c_str(), "  ");
#endif
}

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

NS_CC_END