steampp.cpp

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#include <steampp/steampp.h>
 
#include <algorithm>
#include <filesystem>
#include <format>
#include <ranges>
#include <unordered_set>
 
#ifdef _WIN32
#include <memory>
#include <Windows.h>
#else
#include <cstdlib>
#endif
 
#include <kvpp/kvpp.h>
#include <sourcepp/FS.h>
 
using namespace kvpp;
using namespace sourcepp;
using namespace steampp;
 
namespace {
 
bool isAppUsingGoldSrcEnginePredicate(std::string_view installDir) {
    std::filesystem::directory_iterator dirIterator{installDir, std::filesystem::directory_options::skip_permission_denied};
    std::error_code ec;
    return std::any_of(std::filesystem::begin(dirIterator), std::filesystem::end(dirIterator), [&ec](const auto& entry){
        return entry.is_directory(ec) && std::filesystem::exists(entry.path() / "liblist.gam", ec);
    });
}
 
bool isAppUsingSourceEnginePredicate(std::string_view installDir) {
    std::filesystem::directory_iterator dirIterator{installDir, std::filesystem::directory_options::skip_permission_denied};
    std::error_code ec;
    return std::any_of(std::filesystem::begin(dirIterator), std::filesystem::end(dirIterator), [&ec](const auto& entry){
        return entry.is_directory(ec) && std::filesystem::exists(entry.path() / "gameinfo.txt", ec);
    });
}
 
bool isAppUsingSource2EnginePredicate(std::string_view installDir) {
    std::filesystem::directory_iterator dirIterator{installDir, std::filesystem::directory_options::skip_permission_denied};
    std::error_code ec;
    return std::any_of(std::filesystem::begin(dirIterator), std::filesystem::end(dirIterator), [&ec](const auto& entry) {
        if (!entry.is_directory(ec)) {
            return false;
        }
        if (std::filesystem::exists(entry.path() / "gameinfo.gi", ec)) {
            return true;
        }
        std::filesystem::directory_iterator subDirIterator{entry.path(), std::filesystem::directory_options::skip_permission_denied};
        return std::any_of(std::filesystem::begin(subDirIterator), std::filesystem::end(subDirIterator), [&ec](const auto& entry_) {
            return entry_.is_directory(ec) && std::filesystem::exists(entry_.path() / "gameinfo.gi", ec);
        });
    });
}
 
// Note: this can't be a template because gcc threw a fit. No idea why
std::unordered_set<AppID> getAppsKnownToUseEngine(bool(*p)(std::string_view)) {
    if (p == &::isAppUsingGoldSrcEnginePredicate) {
        return {
#include "cache/EngineGoldSrc.inl"
        };
    }
    if (p == &::isAppUsingSourceEnginePredicate) {
        return {
#include "cache/EngineSource.inl"
        };
    }
    if (p == &::isAppUsingSource2EnginePredicate) {
        return {
#include "cache/EngineSource2.inl"
        };
    }
    return {};
}
 
template<bool(*P)(std::string_view)>
bool isAppUsingEngine(const Steam* steam, AppID appID) {
    static std::unordered_set<AppID> knownIs = ::getAppsKnownToUseEngine(P);
    if (knownIs.contains(appID)) {
        return true;
    }
 
    static std::unordered_set<AppID> knownIsNot;
    if (knownIsNot.contains(appID)) {
        return false;
    }
 
    if (!steam->isAppInstalled(appID)) {
        return false;
    }
 
    const auto installDir = steam->getAppInstallDir(appID);
    if (std::error_code ec; !std::filesystem::exists(installDir, ec)) [[unlikely]] {
        return false;
    }
 
    if (P(installDir)) {
        knownIs.emplace(appID);
        return true;
    }
    knownIsNot.emplace(appID);
    return false;
}
 
[[nodiscard]] std::string getAppArtPath(const KV1Binary& assetCache, AppID appID, std::string_view steamInstallDir, std::string_view id) {
    if (
        assetCache.getChildCount() != 1 ||
        assetCache[0].getChildCount() != 3 ||
        !assetCache[0].hasChild("cache_version") ||
        static_cast<KV1BinaryValueType>(assetCache[0]["cache_version"].getValue().index()) != KV1BinaryValueType::INT32 ||
        *assetCache[0]["cache_version"].getValue<int32_t>() != 2
    ) {
        return "";
    }
    const auto idStr = std::format("{}", appID);
    const auto& cache = assetCache[0][2][idStr];
    if (cache.isInvalid() || !cache.hasChild(id)) {
        return "";
    }
    const auto path = (std::filesystem::path{steamInstallDir} / "appcache" / "librarycache" / idStr / *cache[id].getValue<std::string>()).string();
    if (std::error_code ec; !std::filesystem::exists(path, ec)) {
        return "";
    }
    return path;
}
 
} // namespace
 
Steam::Steam() {
    std::filesystem::path steamLocation;
    std::error_code ec;
 
#ifdef _WIN32
    {
        // 16383 being the maximum length of a path
        static constexpr DWORD STEAM_LOCATION_MAX_SIZE = 16383;
        std::unique_ptr<char[]> steamLocationData{new char[STEAM_LOCATION_MAX_SIZE]};
 
        HKEY steam;
        if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, R"(SOFTWARE\Valve\Steam)", 0, KEY_QUERY_VALUE | KEY_WOW64_32KEY, &steam) != ERROR_SUCCESS) {
            return;
        }
 
        DWORD steamLocationSize = STEAM_LOCATION_MAX_SIZE;
        if (RegQueryValueExA(steam, "InstallPath", nullptr, nullptr, reinterpret_cast<LPBYTE>(steamLocationData.get()), &steamLocationSize) != ERROR_SUCCESS) {
            return;
        }
 
        RegCloseKey(steam);
        steamLocation = steamLocationSize > 0 ? std::string(steamLocationData.get(), steamLocationSize - 1) : "";
    }
#else
    {
        std::filesystem::path home{std::getenv("HOME")};
#ifdef __APPLE__
        steamLocation = home / "Library" / "Application Support" / "Steam";
#else
        // Snap install takes priority, the .steam symlink may exist simultaneously with Snap installs
        steamLocation = home / "snap" / "steam" / "common" / ".steam" / "steam";
 
        if (!std::filesystem::exists(steamLocation, ec)) {
            // Use the regular install path
            steamLocation = home / ".steam" / "steam";
        }
#endif
    }
 
    if (!std::filesystem::exists(steamLocation, ec)) {
        std::string location;
        std::filesystem::path d{"cwd/steamclient64.dll"};
        for (const auto& entry : std::filesystem::directory_iterator{"/proc/"}) {
            if (std::filesystem::exists(entry / d, ec)) {
                ec.clear();
                const auto s = std::filesystem::read_symlink(entry.path() / "cwd", ec);
                if (ec) {
                    continue;
                }
                location = s.string();
                break;
            }
        }
        if (location.empty()) {
            return;
        }
        steamLocation = location;
    }
#endif
 
    if (!std::filesystem::exists(steamLocation.string(), ec)) {
        return;
    }
    this->steamInstallDir = steamLocation.string();
 
    auto libraryFoldersFilePath = steamLocation / "steamapps" / "libraryfolders.vdf";
    if (!std::filesystem::exists(libraryFoldersFilePath, ec)) {
        return;
    }
 
    KV1 libraryFolders{fs::readFileText(libraryFoldersFilePath.string())};
 
    const auto& libraryFoldersValue = libraryFolders["libraryfolders"];
    if (libraryFoldersValue.isInvalid()) {
        return;
    }
 
    for (uint64_t i = 0; i < libraryFoldersValue.getChildCount(); i++) {
        const auto& folder = libraryFoldersValue[i];
 
        auto folderName = folder.getKey();
        if (folderName == "TimeNextStatsReport" || folderName == "ContentStatsID") {
            continue;
        }
 
        const auto& folderPath = folder["path"];
        if (folderPath.isInvalid()) {
            continue;
        }
 
        std::filesystem::path libraryFolderPath{folderPath.getValue()};
        {
            std::string libraryFolderPathProcessedEscapes;
            bool hitBackslash = false;
            for (char c : libraryFolderPath.string()) {
                if (hitBackslash || c != '\\') {
                    libraryFolderPathProcessedEscapes += c;
                    hitBackslash = false;
                } else {
                    hitBackslash = true;
                }
            }
            libraryFolderPath = libraryFolderPathProcessedEscapes;
        }
        libraryFolderPath /= "steamapps";
 
        if (!std::filesystem::exists(libraryFolderPath, ec)) {
            continue;
        }
        this->libraryDirs.push_back(libraryFolderPath.string());
 
        for (const auto& entry : std::filesystem::directory_iterator{libraryFolderPath, std::filesystem::directory_options::skip_permission_denied}) {
            auto entryName = entry.path().filename().string();
            if (!entryName.starts_with("appmanifest_") || !entryName.ends_with(".acf")) {
                continue;
            }
 
            KV1 appManifest(fs::readFileText(entry.path().string()));
 
            const auto& appState = appManifest["AppState"];
            if (appState.isInvalid()) {
                continue;
            }
 
            const auto& appName = appState["name"];
            if (appName.isInvalid()) {
                continue;
            }
            const auto& appInstallDir = appState["installdir"];
            if (appInstallDir.isInvalid()) {
                continue;
            }
            const auto& appID = appState["appid"];
            if (appID.isInvalid()) {
                continue;
            }
 
            this->gameDetails[std::stoi(std::string{appID.getValue()})] = GameInfo{
                .name = std::string{appName.getValue()},
                .installDir = std::string{appInstallDir.getValue()},
                .libraryInstallDirsIndex = this->libraryDirs.size() - 1,
            };
        }
    }
 
    const auto assetCacheFilePath = steamLocation / "appcache" / "librarycache" / "assetcache.vdf";
    if (std::filesystem::exists(assetCacheFilePath, ec)) {
        this->assetCache = KV1Binary{fs::readFileBuffer(assetCacheFilePath.string())};
    }
}
 
std::string_view Steam::getInstallDir() const {
    return this->steamInstallDir;
}
 
const std::vector<std::string>& Steam::getLibraryDirs() const {
    return this->libraryDirs;
}
 
std::string Steam::getSourceModDir() const {
    return (std::filesystem::path{this->steamInstallDir} / "steamapps" / "sourcemods").string();
}
 
std::vector<AppID> Steam::getInstalledApps() const {
    auto keys = std::views::keys(this->gameDetails);
    return {keys.begin(), keys.end()};
}
 
bool Steam::isAppInstalled(AppID appID) const {
    return this->gameDetails.contains(appID);
}
 
std::string_view Steam::getAppName(AppID appID) const {
    if (!this->gameDetails.contains(appID)) {
        return "";
    }
    return this->gameDetails.at(appID).name;
}
 
std::string Steam::getAppInstallDir(AppID appID) const {
    if (!this->gameDetails.contains(appID)) {
        return "";
    }
    return (std::filesystem::path{this->libraryDirs[this->gameDetails.at(appID).libraryInstallDirsIndex]} / "common" / this->gameDetails.at(appID).installDir).string();
}
 
std::string Steam::getAppIconPath(AppID appID) const {
    if (!this->gameDetails.contains(appID)) {
        return "";
    }
    if (const auto cachedPath = ::getAppArtPath(this->assetCache, appID, this->steamInstallDir, "4f"); !cachedPath.empty()) {
        return cachedPath;
    }
    auto path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / std::to_string(appID) / "icon.jpg").string();
    if (std::error_code ec; !std::filesystem::exists(path, ec)) {
        path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / (std::to_string(appID) + "_icon.jpg")).string();
        if (!std::filesystem::exists(path, ec)) {
            return "";
        }
    }
    return path;
}
 
std::string Steam::getAppLogoPath(AppID appID) const {
    if (!this->gameDetails.contains(appID)) {
        return "";
    }
    if (const auto cachedPath = ::getAppArtPath(this->assetCache, appID, this->steamInstallDir, "2f"); !cachedPath.empty()) {
        return cachedPath;
    }
    auto path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / std::to_string(appID) / "logo.png").string();
    if (std::error_code ec; !std::filesystem::exists(path, ec)) {
        path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / (std::to_string(appID) + "_logo.png")).string();
        if (!std::filesystem::exists(path, ec)) {
            return "";
        }
    }
    return path;
}
 
std::string Steam::getAppHeroPath(AppID appID) const {
    if (!this->gameDetails.contains(appID)) {
        return "";
    }
    if (const auto cachedPath = ::getAppArtPath(this->assetCache, appID, this->steamInstallDir, "1f"); !cachedPath.empty()) {
        return cachedPath;
    }
    auto path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / std::to_string(appID) / "library_hero.jpg").string();
    if (std::error_code ec; !std::filesystem::exists(path, ec)) {
        path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / (std::to_string(appID) + "_library_hero.jpg")).string();
        if (!std::filesystem::exists(path, ec)) {
            return "";
        }
    }
    return path;
}
 
std::string Steam::getAppBoxArtPath(AppID appID) const {
    if (!this->gameDetails.contains(appID)) {
        return "";
    }
    if (const auto cachedPath = ::getAppArtPath(this->assetCache, appID, this->steamInstallDir, "0f"); !cachedPath.empty()) {
        return cachedPath;
    }
    auto path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / std::to_string(appID) / "library_600x900.jpg").string();
    if (std::error_code ec; !std::filesystem::exists(path, ec)) {
        path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / (std::to_string(appID) + "_library_600x900.jpg")).string();
        if (!std::filesystem::exists(path, ec)) {
            return "";
        }
    }
    return path;
}
 
std::string Steam::getAppStoreArtPath(AppID appID) const {
    if (!this->gameDetails.contains(appID)) {
        return "";
    }
    if (const auto cachedPath = ::getAppArtPath(this->assetCache, appID, this->steamInstallDir, "3f"); !cachedPath.empty()) {
        return cachedPath;
    }
    auto path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / std::to_string(appID) / "header.jpg").string();
    if (std::error_code ec; !std::filesystem::exists(path, ec)) {
        path = (std::filesystem::path{this->steamInstallDir} / "appcache" / "librarycache" / (std::to_string(appID) + "_header.jpg")).string();
        if (!std::filesystem::exists(path, ec)) {
            return "";
        }
    }
    return path;
}
 
bool Steam::isAppUsingGoldSrcEngine(AppID appID) const {
    return ::isAppUsingEngine<::isAppUsingGoldSrcEnginePredicate>(this, appID);
}
 
bool Steam::isAppUsingSourceEngine(AppID appID) const {
    return ::isAppUsingEngine<::isAppUsingSourceEnginePredicate>(this, appID);
}
 
bool Steam::isAppUsingSource2Engine(AppID appID) const {
    return ::isAppUsingEngine<::isAppUsingSource2EnginePredicate>(this, appID);
}
 
Steam::operator bool() const {
    return !this->gameDetails.empty();
}