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#pragma once
#include <app.h>
#include <http_request.h>
#include <http_response.h>
#include <boost/container/flat_map.hpp>
#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_generators.hpp>
#include <boost/uuid/uuid_io.hpp>
#include <nlohmann/json.hpp>
#include <pam_authenticate.hpp>
#include <sessions.hpp>
#include <webassets.hpp>
#include <filesystem>
#include <random>
namespace crow
{
namespace persistent_data
{
namespace fs = std::filesystem;
class Middleware
{
uint64_t jsonRevision = 1;
public:
// todo(ed) should read this from a fixed location somewhere, not CWD
static constexpr const char* filename = "bmcweb_persistent_data.json";
struct Context
{};
Middleware()
{
readData();
}
~Middleware()
{
if (persistent_data::SessionStore::getInstance().needsWrite())
{
writeData();
}
}
void beforeHandle(crow::Request& req, Response& res, Context& ctx)
{}
void afterHandle(Request& req, Response& res, Context& ctx)
{}
// TODO(ed) this should really use protobuf, or some other serialization
// library, but adding another dependency is somewhat outside the scope of
// this application for the moment
void readData()
{
std::ifstream persistentFile(filename);
uint64_t fileRevision = 0;
if (persistentFile.is_open())
{
// call with exceptions disabled
auto data = nlohmann::json::parse(persistentFile, nullptr, false);
if (data.is_discarded())
{
BMCWEB_LOG_ERROR
<< "Error parsing persistent data in json file.";
}
else
{
for (const auto& item : data.items())
{
if (item.key() == "revision")
{
fileRevision = 0;
const uint64_t* uintPtr =
item.value().get_ptr<const uint64_t*>();
if (uintPtr == nullptr)
{
BMCWEB_LOG_ERROR << "Failed to read revision flag";
}
else
{
fileRevision = *uintPtr;
}
}
else if (item.key() == "system_uuid")
{
const std::string* jSystemUuid =
item.value().get_ptr<const std::string*>();
if (jSystemUuid != nullptr)
{
systemUuid = *jSystemUuid;
}
}
else if (item.key() == "auth_config")
{
SessionStore::getInstance()
.getAuthMethodsConfig()
.fromJson(item.value());
}
else if (item.key() == "sessions")
{
for (const auto& elem : item.value())
{
std::shared_ptr<UserSession> newSession =
UserSession::fromJson(elem);
if (newSession == nullptr)
{
BMCWEB_LOG_ERROR << "Problem reading session "
"from persistent store";
continue;
}
BMCWEB_LOG_DEBUG
<< "Restored session: " << newSession->csrfToken
<< " " << newSession->uniqueId << " "
<< newSession->sessionToken;
SessionStore::getInstance().authTokens.emplace(
newSession->sessionToken, newSession);
}
}
else
{
// Do nothing in the case of extra fields. We may have
// cases where fields are added in the future, and we
// want to at least attempt to gracefully support
// downgrades in that case, even if we don't officially
// support it
}
}
}
}
bool needWrite = false;
if (systemUuid.empty())
{
systemUuid =
boost::uuids::to_string(boost::uuids::random_generator()());
needWrite = true;
}
if (fileRevision < jsonRevision)
{
needWrite = true;
}
// write revision changes or system uuid changes immediately
if (needWrite)
{
writeData();
}
}
void writeData()
{
std::ofstream persistentFile(filename);
// set the permission of the file to 640
fs::perms permission = fs::perms::owner_read | fs::perms::owner_write |
fs::perms::group_read;
fs::permissions(filename, permission);
nlohmann::json data{
{"sessions", SessionStore::getInstance().authTokens},
{"auth_config", SessionStore::getInstance().getAuthMethodsConfig()},
{"system_uuid", systemUuid},
{"revision", jsonRevision}};
persistentFile << data;
}
std::string systemUuid{""};
};
} // namespace persistent_data
} // namespace crow
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