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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <cctype>
#include <mbedtls/md5.h>
#include "backend/boxcat.h"
#include "common/hex_util.h"
#include "common/logging/log.h"
#include "common/string_util.h"
#include "core/file_sys/vfs.h"
#include "core/hle/ipc_helpers.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/readable_event.h"
#include "core/hle/kernel/writable_event.h"
#include "core/hle/service/bcat/backend/backend.h"
#include "core/hle/service/bcat/bcat.h"
#include "core/hle/service/bcat/module.h"
#include "core/hle/service/filesystem/filesystem.h"
#include "core/settings.h"

namespace Service::BCAT {

constexpr ResultCode ERROR_INVALID_ARGUMENT{ErrorModule::BCAT, 1};
constexpr ResultCode ERROR_FAILED_OPEN_ENTITY{ErrorModule::BCAT, 2};
constexpr ResultCode ERROR_ENTITY_ALREADY_OPEN{ErrorModule::BCAT, 6};
constexpr ResultCode ERROR_NO_OPEN_ENTITY{ErrorModule::BCAT, 7};

// The command to clear the delivery cache just calls fs IFileSystem DeleteFile on all of the files
// and if any of them have a non-zero result it just forwards that result. This is the FS error code
// for permission denied, which is the closest approximation of this scenario.
constexpr ResultCode ERROR_FAILED_CLEAR_CACHE{ErrorModule::FS, 6400};

using BCATDigest = std::array<u8, 0x10>;

struct DeliveryCacheProgressImpl {
    enum class Status : u8 {
        Incomplete = 0x1,
        Complete = 0x9,
    };

    Status status = Status::Incomplete;
    INSERT_PADDING_BYTES(
        0x1FF); ///< TODO(DarkLordZach): RE this structure. It just seems to convey info about the
                ///< progress of the BCAT sync, but for us just setting completion works.
};
static_assert(sizeof(DeliveryCacheProgressImpl) == 0x200,
              "DeliveryCacheProgressImpl has incorrect size.");

namespace {

u64 GetCurrentBuildID() {
    const auto& id = Core::System::GetInstance().GetCurrentProcessBuildID();
    u64 out{};
    std::memcpy(&out, id.data(), sizeof(u64));
    return out;
}

// The digest is only used to determine if a file is unique compared to others of the same name.
// Since the algorithm isn't ever checked in game, MD5 is safe.
BCATDigest DigestFile(const FileSys::VirtualFile& file) {
    BCATDigest out{};
    const auto bytes = file->ReadAllBytes();
    mbedtls_md5(bytes.data(), bytes.size(), out.data());
    return out;
}

// For a name to be valid it must be non-empty, must have a null terminating character as the final
// char, can only contain numbers, letters, underscores and a hyphen if directory and a period if
// file.
bool VerifyNameValidInternal(Kernel::HLERequestContext& ctx, std::array<char, 0x20> name,
                             char match_char) {
    const auto null_chars = std::count(name.begin(), name.end(), 0);
    const auto bad_chars = std::count_if(name.begin(), name.end(), [match_char](char c) {
        return !std::isalnum(static_cast<u8>(c)) && c != '_' && c != match_char && c != '\0';
    });
    if (null_chars == 0x20 || null_chars == 0 || bad_chars != 0 || name[0x1F] != '\0') {
        LOG_ERROR(Service_BCAT, "Name passed was invalid!");
        IPC::ResponseBuilder rb{ctx, 2};
        rb.Push(ERROR_INVALID_ARGUMENT);
        return false;
    }

    return true;
}

bool VerifyNameValidDir(Kernel::HLERequestContext& ctx, std::array<char, 0x20> name) {
    return VerifyNameValidInternal(ctx, name, '-');
}

bool VerifyNameValidFile(Kernel::HLERequestContext& ctx, std::array<char, 0x20> name) {
    return VerifyNameValidInternal(ctx, name, '.');
}

} // Anonymous namespace

using DirectoryName = std::array<char, 0x20>;
using FileName = std::array<char, 0x20>;

struct DeliveryCacheDirectoryEntry {
    FileName name;
    u64 size;
    BCATDigest digest;
};

class IDeliveryCacheProgressService final : public ServiceFramework<IDeliveryCacheProgressService> {
public:
    IDeliveryCacheProgressService(Kernel::SharedPtr<Kernel::ReadableEvent> event,
                                  const DeliveryCacheProgressImpl& impl)
        : ServiceFramework{"IDeliveryCacheProgressService"}, event(std::move(event)), impl(impl) {
        // clang-format off
        static const FunctionInfo functions[] = {
            {0, &IDeliveryCacheProgressService::GetEvent, "GetEvent"},
            {1, &IDeliveryCacheProgressService::GetImpl, "GetImpl"},
        };
        // clang-format on

        RegisterHandlers(functions);
    }

private:
    void GetEvent(Kernel::HLERequestContext& ctx) {
        LOG_DEBUG(Service_BCAT, "called");

        IPC::ResponseBuilder rb{ctx, 2, 1};
        rb.Push(RESULT_SUCCESS);
        rb.PushCopyObjects(event);
    }

    void GetImpl(Kernel::HLERequestContext& ctx) {
        LOG_DEBUG(Service_BCAT, "called");

        ctx.WriteBuffer(&impl, sizeof(DeliveryCacheProgressImpl));

        IPC::ResponseBuilder rb{ctx, 2};
        rb.Push(RESULT_SUCCESS);
    }

    Kernel::SharedPtr<Kernel::ReadableEvent> event;
    const DeliveryCacheProgressImpl& impl;
};

class IBcatService final : public ServiceFramework<IBcatService> {
public:
    IBcatService(Backend& backend) : ServiceFramework("IBcatService"), backend(backend) {
        // clang-format off
        static const FunctionInfo functions[] = {
            {10100, &IBcatService::RequestSyncDeliveryCache, "RequestSyncDeliveryCache"},
            {10101, &IBcatService::RequestSyncDeliveryCacheWithDirectoryName, "RequestSyncDeliveryCacheWithDirectoryName"},
            {10200, nullptr, "CancelSyncDeliveryCacheRequest"},
            {20100, nullptr, "RequestSyncDeliveryCacheWithApplicationId"},
            {20101, nullptr, "RequestSyncDeliveryCacheWithApplicationIdAndDirectoryName"},
            {30100, nullptr, "SetPassphrase"},
            {30200, nullptr, "RegisterBackgroundDeliveryTask"},
            {30201, nullptr, "UnregisterBackgroundDeliveryTask"},
            {30202, nullptr, "BlockDeliveryTask"},
            {30203, nullptr, "UnblockDeliveryTask"},
            {90100, nullptr, "EnumerateBackgroundDeliveryTask"},
            {90200, nullptr, "GetDeliveryList"},
            {90201, nullptr, "ClearDeliveryCacheStorage"},
            {90300, nullptr, "GetPushNotificationLog"},
        };
        // clang-format on
        RegisterHandlers(functions);

        auto& kernel{Core::System::GetInstance().Kernel()};
        progress.at(static_cast<std::size_t>(SyncType::Normal)).event =
            Kernel::WritableEvent::CreateEventPair(kernel, Kernel::ResetType::Sticky,
                                                   "BCAT::IDeliveryCacheProgressEvent");
        progress.at(static_cast<std::size_t>(SyncType::Directory)).event =
            Kernel::WritableEvent::CreateEventPair(
                kernel, Kernel::ResetType::OneShot,
                "BCAT::IDeliveryCacheProgressEvent::DirectoryName");
    }

private:
    enum class SyncType {
        Normal,
        Directory,
        Count,
    };

    std::function<void(bool)> CreateCallback(SyncType type) {
        return [this, type](bool success) {
            auto& pair{progress.at(static_cast<std::size_t>(type))};
            pair.impl.status = DeliveryCacheProgressImpl::Status::Complete;
            pair.event.writable->Signal();
        };
    }

    std::shared_ptr<IDeliveryCacheProgressService> CreateProgressService(SyncType type) {
        const auto& pair{progress.at(static_cast<std::size_t>(type))};
        return std::make_shared<IDeliveryCacheProgressService>(pair.event.readable, pair.impl);
    }

    void RequestSyncDeliveryCache(Kernel::HLERequestContext& ctx) {
        LOG_DEBUG(Service_BCAT, "called");

        backend.Synchronize({Core::CurrentProcess()->GetTitleID(), GetCurrentBuildID()},
                            CreateCallback(SyncType::Normal));

        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
        rb.Push(RESULT_SUCCESS);
        rb.PushIpcInterface(CreateProgressService(SyncType::Normal));
    }

    void RequestSyncDeliveryCacheWithDirectoryName(Kernel::HLERequestContext& ctx) {
        IPC::RequestParser rp{ctx};
        const auto name_raw = rp.PopRaw<DirectoryName>();
        const auto name =
            Common::StringFromFixedZeroTerminatedBuffer(name_raw.data(), name_raw.size());

        LOG_DEBUG(Service_BCAT, "called, name={}", name);

        backend.SynchronizeDirectory({Core::CurrentProcess()->GetTitleID(), GetCurrentBuildID()},
                                     name, CreateCallback(SyncType::Directory));

        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
        rb.Push(RESULT_SUCCESS);
        rb.PushIpcInterface(CreateProgressService(SyncType::Directory));
    }

    }

    Backend& backend;

    struct ProgressPair {
        Kernel::EventPair event;
        DeliveryCacheProgressImpl impl;
    };

    std::array<ProgressPair, static_cast<std::size_t>(SyncType::Count)> progress{};
};

void Module::Interface::CreateBcatService(Kernel::HLERequestContext& ctx) {
    LOG_DEBUG(Service_BCAT, "called");

    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
    rb.Push(RESULT_SUCCESS);
    rb.PushIpcInterface<IBcatService>(*backend);
}

class IDeliveryCacheFileService final : public ServiceFramework<IDeliveryCacheFileService> {
public:
    IDeliveryCacheFileService(FileSys::VirtualDir root_)
        : ServiceFramework{"IDeliveryCacheFileService"}, root(std::move(root_)) {
        // clang-format off
        static const FunctionInfo functions[] = {
            {0, &IDeliveryCacheFileService::Open, "Open"},
            {1, &IDeliveryCacheFileService::Read, "Read"},
            {2, &IDeliveryCacheFileService::GetSize, "GetSize"},
            {3, &IDeliveryCacheFileService::GetDigest, "GetDigest"},
        };
        // clang-format on

        RegisterHandlers(functions);
    }

private:
    void Open(Kernel::HLERequestContext& ctx) {
        IPC::RequestParser rp{ctx};
        const auto dir_name_raw = rp.PopRaw<DirectoryName>();
        const auto file_name_raw = rp.PopRaw<FileName>();

        const auto dir_name =
            Common::StringFromFixedZeroTerminatedBuffer(dir_name_raw.data(), dir_name_raw.size());
        const auto file_name =
            Common::StringFromFixedZeroTerminatedBuffer(file_name_raw.data(), file_name_raw.size());

        LOG_DEBUG(Service_BCAT, "called, dir_name={}, file_name={}", dir_name, file_name);

        if (!VerifyNameValidDir(ctx, dir_name_raw) || !VerifyNameValidFile(ctx, file_name_raw))
            return;

        if (current_file != nullptr) {
            LOG_ERROR(Service_BCAT, "A file has already been opened on this interface!");
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_ENTITY_ALREADY_OPEN);
            return;
        }

        const auto dir = root->GetSubdirectory(dir_name);

        if (dir == nullptr) {
            LOG_ERROR(Service_BCAT, "The directory of name={} couldn't be opened!", dir_name);
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_FAILED_OPEN_ENTITY);
            return;
        }

        current_file = dir->GetFile(file_name);

        if (current_file == nullptr) {
            LOG_ERROR(Service_BCAT, "The file of name={} couldn't be opened!", file_name);
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_FAILED_OPEN_ENTITY);
            return;
        }

        IPC::ResponseBuilder rb{ctx, 2};
        rb.Push(RESULT_SUCCESS);
    }

    void Read(Kernel::HLERequestContext& ctx) {
        IPC::RequestParser rp{ctx};
        const auto offset{rp.PopRaw<u64>()};

        auto size = ctx.GetWriteBufferSize();

        LOG_DEBUG(Service_BCAT, "called, offset={:016X}, size={:016X}", offset, size);

        if (current_file == nullptr) {
            LOG_ERROR(Service_BCAT, "There is no file currently open!");
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_NO_OPEN_ENTITY);
        }

        size = std::min(current_file->GetSize() - offset, size);
        const auto buffer = current_file->ReadBytes(size, offset);
        ctx.WriteBuffer(buffer);

        IPC::ResponseBuilder rb{ctx, 4};
        rb.Push(RESULT_SUCCESS);
        rb.Push<u64>(buffer.size());
    }

    void GetSize(Kernel::HLERequestContext& ctx) {
        LOG_DEBUG(Service_BCAT, "called");

        if (current_file == nullptr) {
            LOG_ERROR(Service_BCAT, "There is no file currently open!");
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_NO_OPEN_ENTITY);
        }

        IPC::ResponseBuilder rb{ctx, 4};
        rb.Push(RESULT_SUCCESS);
        rb.Push<u64>(current_file->GetSize());
    }

    void GetDigest(Kernel::HLERequestContext& ctx) {
        LOG_DEBUG(Service_BCAT, "called");

        if (current_file == nullptr) {
            LOG_ERROR(Service_BCAT, "There is no file currently open!");
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_NO_OPEN_ENTITY);
        }

        IPC::ResponseBuilder rb{ctx, 6};
        rb.Push(RESULT_SUCCESS);
        rb.PushRaw(DigestFile(current_file));
    }

    FileSys::VirtualDir root;
    FileSys::VirtualFile current_file;
};

class IDeliveryCacheDirectoryService final
    : public ServiceFramework<IDeliveryCacheDirectoryService> {
public:
    IDeliveryCacheDirectoryService(FileSys::VirtualDir root_)
        : ServiceFramework{"IDeliveryCacheDirectoryService"}, root(std::move(root_)) {
        // clang-format off
        static const FunctionInfo functions[] = {
            {0, &IDeliveryCacheDirectoryService::Open, "Open"},
            {1, &IDeliveryCacheDirectoryService::Read, "Read"},
            {2, &IDeliveryCacheDirectoryService::GetCount, "GetCount"},
        };
        // clang-format on

        RegisterHandlers(functions);
    }

private:
    void Open(Kernel::HLERequestContext& ctx) {
        IPC::RequestParser rp{ctx};
        const auto name_raw = rp.PopRaw<DirectoryName>();
        const auto name =
            Common::StringFromFixedZeroTerminatedBuffer(name_raw.data(), name_raw.size());

        LOG_DEBUG(Service_BCAT, "called, name={}", name);

        if (!VerifyNameValidDir(ctx, name_raw))
            return;

        if (current_dir != nullptr) {
            LOG_ERROR(Service_BCAT, "A file has already been opened on this interface!");
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_ENTITY_ALREADY_OPEN);
            return;
        }

        current_dir = root->GetSubdirectory(name);

        if (current_dir == nullptr) {
            LOG_ERROR(Service_BCAT, "Failed to open the directory name={}!", name);
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_FAILED_OPEN_ENTITY);
            return;
        }

        IPC::ResponseBuilder rb{ctx, 2};
        rb.Push(RESULT_SUCCESS);
    }

    void Read(Kernel::HLERequestContext& ctx) {
        auto write_size = ctx.GetWriteBufferSize() / sizeof(DeliveryCacheDirectoryEntry);

        LOG_DEBUG(Service_BCAT, "called, write_size={:016X}", write_size);

        if (current_dir == nullptr) {
            LOG_ERROR(Service_BCAT, "There is no open directory!");
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_NO_OPEN_ENTITY);
            return;
        }

        const auto files = current_dir->GetFiles();
        write_size = std::min(write_size, files.size());
        std::vector<DeliveryCacheDirectoryEntry> entries(write_size);
        std::transform(
            files.begin(), files.begin() + write_size, entries.begin(), [](const auto& file) {
                FileName name{};
                std::memcpy(name.data(), file->GetName().data(),
                            std::min(file->GetName().size(), name.size()));
                return DeliveryCacheDirectoryEntry{name, file->GetSize(), DigestFile(file)};
            });

        ctx.WriteBuffer(entries);

        IPC::ResponseBuilder rb{ctx, 3};
        rb.Push(RESULT_SUCCESS);
        rb.Push<u32>(write_size * sizeof(DeliveryCacheDirectoryEntry));
    }

    void GetCount(Kernel::HLERequestContext& ctx) {
        LOG_DEBUG(Service_BCAT, "called");

        if (current_dir == nullptr) {
            LOG_ERROR(Service_BCAT, "There is no open directory!");
            IPC::ResponseBuilder rb{ctx, 2};
            rb.Push(ERROR_NO_OPEN_ENTITY);
            return;
        }

        const auto files = current_dir->GetFiles();

        IPC::ResponseBuilder rb{ctx, 3};
        rb.Push(RESULT_SUCCESS);
        rb.Push<u32>(files.size());
    }

    FileSys::VirtualDir root;
    FileSys::VirtualDir current_dir;
};

class IDeliveryCacheStorageService final : public ServiceFramework<IDeliveryCacheStorageService> {
public:
    IDeliveryCacheStorageService(FileSys::VirtualDir root_)
        : ServiceFramework{"IDeliveryCacheStorageService"}, root(std::move(root_)) {
        // clang-format off
        static const FunctionInfo functions[] = {
            {0, &IDeliveryCacheStorageService::CreateFileService, "CreateFileService"},
            {1, &IDeliveryCacheStorageService::CreateDirectoryService, "CreateDirectoryService"},
            {10, &IDeliveryCacheStorageService::EnumerateDeliveryCacheDirectory, "EnumerateDeliveryCacheDirectory"},
        };
        // clang-format on

        RegisterHandlers(functions);

        for (const auto& subdir : root->GetSubdirectories()) {
            DirectoryName name{};
            std::memcpy(name.data(), subdir->GetName().data(),
                        std::min(sizeof(DirectoryName) - 1, subdir->GetName().size()));
            entries.push_back(name);
        }
    }

private:
    void CreateFileService(Kernel::HLERequestContext& ctx) {
        LOG_DEBUG(Service_BCAT, "called");

        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
        rb.Push(RESULT_SUCCESS);
        rb.PushIpcInterface<IDeliveryCacheFileService>(root);
    }

    void CreateDirectoryService(Kernel::HLERequestContext& ctx) {
        LOG_DEBUG(Service_BCAT, "called");

        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
        rb.Push(RESULT_SUCCESS);
        rb.PushIpcInterface<IDeliveryCacheDirectoryService>(root);
    }

    void EnumerateDeliveryCacheDirectory(Kernel::HLERequestContext& ctx) {
        auto size = ctx.GetWriteBufferSize() / sizeof(DirectoryName);

        LOG_DEBUG(Service_BCAT, "called, size={:016X}", size);

        size = std::min(size, entries.size() - next_read_index);
        ctx.WriteBuffer(entries.data() + next_read_index, size * sizeof(DirectoryName));
        next_read_index += size;

        IPC::ResponseBuilder rb{ctx, 3};
        rb.Push(RESULT_SUCCESS);
        rb.Push<u32>(size);
    }

    FileSys::VirtualDir root;
    std::vector<DirectoryName> entries;
    u64 next_read_index = 0;
};

void Module::Interface::CreateDeliveryCacheStorageService(Kernel::HLERequestContext& ctx) {
    LOG_DEBUG(Service_BCAT, "called");

    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
    rb.Push(RESULT_SUCCESS);
    rb.PushIpcInterface<IDeliveryCacheStorageService>(
        Service::FileSystem::GetBCATDirectory(Core::CurrentProcess()->GetTitleID()));
}

void Module::Interface::CreateDeliveryCacheStorageServiceWithApplicationId(
    Kernel::HLERequestContext& ctx) {
    IPC::RequestParser rp{ctx};
    const auto title_id = rp.PopRaw<u64>();

    LOG_DEBUG(Service_BCAT, "called, title_id={:016X}", title_id);

    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
    rb.Push(RESULT_SUCCESS);
    rb.PushIpcInterface<IDeliveryCacheStorageService>(
        Service::FileSystem::GetBCATDirectory(title_id));
}

namespace {
std::unique_ptr<Backend> CreateBackendFromSettings(DirectoryGetter getter) {
    const auto backend = Settings::values.bcat_backend;

#ifdef YUZU_ENABLE_BOXCAT
    if (backend == "boxcat")
        return std::make_unique<Boxcat>(std::move(getter));
#endif

    return std::make_unique<NullBackend>(std::move(getter));
}
} // Anonymous namespace

Module::Interface::Interface(std::shared_ptr<Module> module, const char* name)
    : ServiceFramework(name), module(std::move(module)),
      backend(CreateBackendFromSettings(&Service::FileSystem::GetBCATDirectory)) {}

Module::Interface::~Interface() = default;

void InstallInterfaces(SM::ServiceManager& service_manager) {
    auto module = std::make_shared<Module>();
    std::make_shared<BCAT>(module, "bcat:a")->InstallAsService(service_manager);
    std::make_shared<BCAT>(module, "bcat:m")->InstallAsService(service_manager);
    std::make_shared<BCAT>(module, "bcat:u")->InstallAsService(service_manager);
    std::make_shared<BCAT>(module, "bcat:s")->InstallAsService(service_manager);
}

} // namespace Service::BCAT