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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2015 ZeroTier, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "JSONDB.hpp"
namespace ZeroTier {
static const nlohmann::json _EMPTY_JSON(nlohmann::json::object());
bool JSONDB::writeRaw(const std::string &n,const std::string &obj)
{
if (!_isValidObjectName(n))
return false;
const std::string path(_genPath(n,true));
if (!path.length())
return false;
const std::string buf(obj);
if (!OSUtils::writeFile(path.c_str(),buf))
return false;
return true;
}
bool JSONDB::put(const std::string &n,const nlohmann::json &obj)
{
if (!_isValidObjectName(n))
return false;
const std::string path(_genPath(n,true));
if (!path.length())
return false;
const std::string buf(OSUtils::jsonDump(obj));
if (!OSUtils::writeFile(path.c_str(),buf))
return false;
_E &e = _db[n];
e.obj = obj;
return true;
}
const nlohmann::json &JSONDB::get(const std::string &n)
{
if (!_isValidObjectName(n))
return _EMPTY_JSON;
std::map<std::string,_E>::iterator e(_db.find(n));
if (e != _db.end())
return e->second.obj;
const std::string path(_genPath(n,false));
if (!path.length())
return _EMPTY_JSON;
std::string buf;
if (!OSUtils::readFile(path.c_str(),buf))
return _EMPTY_JSON;
_E &e2 = _db[n];
try {
e2.obj = OSUtils::jsonParse(buf);
} catch ( ... ) {
e2.obj = _EMPTY_JSON;
buf = "{}";
}
return e2.obj;
}
void JSONDB::erase(const std::string &n)
{
if (!_isValidObjectName(n))
return;
std::string path(_genPath(n,true));
if (!path.length())
return;
OSUtils::rm(path.c_str());
_db.erase(n);
}
void JSONDB::_reload(const std::string &p,const std::string &b)
{
std::vector<std::string> dl(OSUtils::listDirectory(p.c_str()));
for(std::vector<std::string>::const_iterator di(dl.begin());di!=dl.end();++di) {
if ((di->length() > 5)&&(di->substr(di->length() - 5) == ".json")) {
this->get(b + di->substr(0,di->length() - 5));
} else {
this->_reload((p + ZT_PATH_SEPARATOR + *di),(b + *di + ZT_PATH_SEPARATOR));
}
}
}
bool JSONDB::_isValidObjectName(const std::string &n)
{
if (n.length() == 0)
return false;
const char *p = n.c_str();
char c;
// For security reasons we should not allow dots, backslashes, or other path characters or potential path characters.
while ((c = *(p++))) {
if (!( ((c >= 'a')&&(c <= 'z')) || ((c >= 'A')&&(c <= 'Z')) || ((c >= '0')&&(c <= '9')) || (c == '/') || (c == '_') || (c == '~') || (c == '-') ))
return false;
}
return true;
}
std::string JSONDB::_genPath(const std::string &n,bool create)
{
std::vector<std::string> pt(OSUtils::split(n.c_str(),"/","",""));
if (pt.size() == 0)
return std::string();
std::string p(_basePath);
if (create) OSUtils::mkdir(p.c_str());
for(unsigned long i=0,j=(unsigned long)(pt.size()-1);i<j;++i) {
p.push_back(ZT_PATH_SEPARATOR);
p.append(pt[i]);
if (create) OSUtils::mkdir(p.c_str());
}
p.push_back(ZT_PATH_SEPARATOR);
p.append(pt[pt.size()-1]);
p.append(".json");
return p;
}
} // namespace ZeroTier
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