Skip to content
Permalink
Browse files

UICommon: Add NetPlayIndex helper

  • Loading branch information...
spycrab committed Mar 30, 2019
1 parent 3dbf444 commit 827e40d78a33dae5e9eb6c4a3a6899529b825767
@@ -5,6 +5,7 @@ add_library(uicommon
DiscordPresence.cpp
GameFile.cpp
GameFileCache.cpp
NetPlayIndex.cpp
ResourcePack/Manager.cpp
ResourcePack/Manifest.cpp
ResourcePack/ResourcePack.cpp
@@ -0,0 +1,321 @@
// Copyright 2019 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include "UICommon/NetPlayIndex.h"

#include <picojson/picojson.h>

#include "Common/HttpRequest.h"
#include "Common/Thread.h"
#include "Common/Version.h"

#include "Core/Config/NetplaySettings.h"

NetPlayIndex::NetPlayIndex()
{
}

NetPlayIndex::~NetPlayIndex()
{
if (!m_secret.empty())
Remove();
}

static std::optional<picojson::value> ParseResponse(std::vector<u8> response)
{
std::string response_string(reinterpret_cast<char*>(response.data()), response.size());

picojson::value json;

auto error = picojson::parse(json, response_string);

if (!error.empty())
return {};

return json;
}

std::optional<std::vector<NetPlaySession>>
NetPlayIndex::List(const std::map<std::string, std::string>& filters)
{
Common::HttpRequest request;

std::string list_url = Config::Get(Config::NETPLAY_INDEX_URL) + "/v0/list";

if (!filters.empty())
{
list_url += "?";
for (const auto& filter : filters)
{
list_url += filter.first + "=" + request.EscapeComponent(filter.second) + "&";
}
list_url = list_url.substr(0, list_url.size() - 1);
}

auto response = request.Get(list_url);

if (!response)
{
m_last_error = "NO_RESPONSE";
return {};
}

auto json = ParseResponse(response.value());

if (!json)
{
m_last_error = "BAD_JSON";
return {};
}

const auto& status = json->get("status");

if (status.to_str() != "OK")
{
m_last_error = status.to_str();
return {};
}

const auto& entries = json->get("sessions");

std::vector<NetPlaySession> sessions;

for (const auto& entry : entries.get<picojson::array>())
{
NetPlaySession session;

const auto& name = entry.get("name");
const auto& region = entry.get("region");
const auto& method = entry.get("method");
const auto& game_id = entry.get("game");
const auto& server_id = entry.get("server_id");
const auto& has_password = entry.get("password");
const auto& player_count = entry.get("player_count");
const auto& port = entry.get("port");
const auto& in_game = entry.get("in_game");

if (!name.is<std::string>() || !region.is<std::string>() || !method.is<std::string>() ||
!server_id.is<std::string>() || !game_id.is<std::string>() || !has_password.is<bool>() ||
!player_count.is<double>() || !port.is<double>() || !in_game.is<bool>())
continue;

session.name = name.to_str();
session.region = region.to_str();
session.game_id = game_id.to_str();
session.server_id = server_id.to_str();
session.method = method.to_str();
session.has_password = has_password.get<bool>();
session.player_count = static_cast<int>(player_count.get<double>());
session.port = static_cast<int>(port.get<double>());
session.in_game = in_game.get<bool>();

sessions.push_back(session);
}

return sessions;
}

void NetPlayIndex::NotificationLoop()
{
while (m_running.IsSet())
{
Common::HttpRequest request;
auto response = request.Get(
Config::Get(Config::NETPLAY_INDEX_URL) + "/v0/session/active?secret=" + m_secret +
"&player_count=" + std::to_string(m_player_count) +
"&game=" + request.EscapeComponent(m_game) + "&in_game=" + std::to_string(m_in_game));

if (!response)
continue;

auto json = ParseResponse(response.value());

if (!json)
{
m_last_error = "BAD_JSON";
m_running.Set(false);
return;
}

std::string status = json->get("status").to_str();

if (status != "OK")
{
m_last_error = status;
m_running.Set(false);
return;
}

Common::SleepCurrentThread(1000 * 5);
}
}

bool NetPlayIndex::Add(NetPlaySession session)
{
m_running.Set(true);

Common::HttpRequest request;
auto response = request.Get(
Config::Get(Config::NETPLAY_INDEX_URL) + "/v0/session/add?name=" +
request.EscapeComponent(session.name) + "&region=" + request.EscapeComponent(session.region) +
"&game=" + request.EscapeComponent(session.game_id) +
"&password=" + std::to_string(session.has_password) + "&method=" + session.method +
"&server_id=" + session.server_id + "&in_game=" + std::to_string(session.in_game) +
"&port=" + std::to_string(session.port) +
"&player_count=" + std::to_string(session.player_count) + "&version=" + Common::scm_desc_str);

if (!response.has_value())
{
m_last_error = "NO_RESPONSE";
return false;
}

auto json = ParseResponse(response.value());

if (!json)
{
m_last_error = "BAD_JSON";
return false;
}

std::string status = json->get("status").to_str();

if (status != "OK")
{
m_last_error = status;
return false;
}

m_secret = json->get("secret").to_str();
m_in_game = session.in_game;
m_player_count = session.player_count;
m_game = session.game_id;

m_session_thread = std::thread([this] { NotificationLoop(); });

m_session_thread.detach();

return true;
}

void NetPlayIndex::SetInGame(bool in_game)
{
m_in_game = in_game;
}

void NetPlayIndex::SetPlayerCount(int player_count)
{
m_player_count = player_count;
}

void NetPlayIndex::SetGame(const std::string& game)
{
m_game = game;
}

void NetPlayIndex::Remove()
{
if (m_secret.empty())
return;

m_running.Set(false);

if (m_session_thread.joinable())
m_session_thread.join();

// We don't really care whether this fails or not
Common::HttpRequest request;
request.Get(Config::Get(Config::NETPLAY_INDEX_URL) + "/v0/session/remove?secret=" + m_secret);

m_secret = "";
}

std::vector<std::string> NetPlayIndex::GetRegions()
{
static std::vector<std::string> regions{"AF", "CN", "EA", "EU", "NA", "OC"};

return regions;
}

// This encryption system uses simple XOR operations and a checksum
// It isn't very secure but is preferable to adding another dependency on mbedtls
// The encrypted data is encoded as nibbles with the character 'A' as the base offset

bool NetPlaySession::EncryptID(const std::string& password)
{
if (password.empty())
return false;

u8 i = 0;

std::string to_encrypt = server_id;

// Calculate and append checksum to ID
u8 sum = 0;

for (char c : to_encrypt)
sum += c;

to_encrypt += sum;

std::string encrypted_id;

for (const char& byte : to_encrypt)
{
char c = byte ^ password[i % password.size()];
c += i;
encrypted_id += 'A' + ((c & 0xF0) >> 4);
encrypted_id += 'A' + (c & 0x0F);
++i;
}

server_id = encrypted_id;

return true;
}

std::optional<std::string> NetPlaySession::DecryptID(const std::string& password) const
{
if (password.empty())
return {};

// If the length of an encrypted session id is not divisble by two, it's invalid
if (server_id.empty() || server_id.size() % 2 != 0)
return {};

std::string decoded;

for (size_t i = 0; i < server_id.size(); i += 2)
{
char c = (server_id[i] - 'A') << 4 | (server_id[i + 1] - 'A');
decoded.push_back(c);
}

u8 i = 0;
for (auto& c : decoded)
{
c -= i;
c ^= password[i % password.size()];
++i;
}

// Verify checksum
u8 expected_sum = decoded[decoded.size() - 1];

decoded = decoded.substr(0, decoded.size() - 1);

u8 sum = 0;
for (char c : decoded)
sum += c;

if (sum != expected_sum)
return {};

return decoded;
}

const std::string& NetPlayIndex::GetLastError() const
{
return m_last_error;
}
@@ -0,0 +1,65 @@
// Copyright 2019 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <map>
#include <optional>
#include <string>
#include <thread>
#include <vector>

#include "Common/Flag.h"

struct NetPlaySession
{
std::string name;
std::string region;
std::string method;
std::string server_id;
std::string game_id;

int player_count;
int port;

bool has_password;
bool in_game;

bool EncryptID(const std::string& password);
std::optional<std::string> DecryptID(const std::string& password) const;
};

class NetPlayIndex
{
public:
explicit NetPlayIndex();
~NetPlayIndex();

std::optional<std::vector<NetPlaySession>>
List(const std::map<std::string, std::string>& filters = {});

static std::vector<std::string> GetRegions();

bool Add(NetPlaySession session);
void Remove();

void SetPlayerCount(int player_count);
void SetInGame(bool in_game);
void SetGame(const std::string& game);

const std::string& GetLastError() const;

private:
void NotificationLoop();

Common::Flag m_running;

std::string m_secret;
std::string m_game;
int m_player_count = 0;
bool m_in_game = false;

std::string m_last_error;
std::thread m_session_thread;
};

0 comments on commit 827e40d

Please sign in to comment.
You can’t perform that action at this time.