CWE-ou-minkata/Sources/Plasma/FeatureLib/pfSecurePreloader/pfSecurePreloader.cpp

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
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*==LICENSE==*/

#include "pfSecurePreloader.h"

#include "hsStream.h"
#include "plgDispatch.h"
#include "plCompression/plZlibStream.h"
#include "pnEncryption/plChecksum.h"
#include "plFile/plFileUtils.h"
#include "plFile/plSecureStream.h"
#include "plFile/plStreamSource.h"
#include "plMessage/plNetCommMsgs.h"
#include "plMessage/plPreloaderMsg.h"
#include "plProgressMgr/plProgressMgr.h"

extern bool gDataServerLocal;
pfSecurePreloader* pfSecurePreloader::fInstance = nil;

/////////////////////////////////////////////////////////////////////

typedef std::pair<const wchar_t*, const wchar_t*> WcharPair;

struct AuthRequestParams
{
    pfSecurePreloader* fThis;
    std::queue<WcharPair> fFileGroups;

    AuthRequestParams(pfSecurePreloader* parent)
        : fThis(parent) { }
};

/////////////////////////////////////////////////////////////////////

void ProcAuthDownloadParams(AuthRequestParams* params);

void GotAuthSrvManifest(
    ENetError                   result,
    void*                       param,
    const NetCliAuthFileInfo    infoArr[],
    uint32_t                      infoCount
) {
    AuthRequestParams* arp = (AuthRequestParams*)param;
    if (IS_NET_ERROR(result))
    {
        FATAL("Failed to get AuthSrv manifest!");
        arp->fThis->Terminate();
        delete arp;
    } else {
        arp->fThis->PreloadManifest(infoArr, infoCount);
        ProcAuthDownloadParams(arp);
    }
}

void GotFileSrvManifest(
    ENetError                     result, 
    void*                         param, 
    const wchar_t                 group[], 
    const NetCliFileManifestEntry manifest[], 
    uint32_t                        entryCount
) {
    pfSecurePreloader* sp = (pfSecurePreloader*)param;
    if (result == kNetErrFileNotFound)
    {
        AuthRequestParams* params = new AuthRequestParams(sp);
        params->fFileGroups.push(WcharPair(L"Python", L"pak"));
        params->fFileGroups.push(WcharPair(L"SDL", L"sdl"));
        ProcAuthDownloadParams(params);
        return;
    } else if (!entryCount) {
        FATAL("SecurePreloader manifest empty!");
        sp->Terminate();
        return;
    }

    sp->PreloadManifest(manifest, entryCount);
}

void FileDownloaded(
    ENetError       result,
    void*           param,
    const wchar_t   filename[],
    hsStream*       writer
) {
    pfSecurePreloader* sp = (pfSecurePreloader*)param;
    if (IS_NET_ERROR(result))
    {
        FATAL("SecurePreloader download failed");
        sp->Terminate();
    } else {
        sp->FilePreloaded(filename, writer);
    }
}

void ProcAuthDownloadParams(AuthRequestParams* params)
{
    // Request the "manifests" until there are none left, then download the files
    if (params->fFileGroups.empty())
    {
        params->fThis->PreloadNextFile();
        delete params;
    } else {
        WcharPair wp = params->fFileGroups.front();
        params->fFileGroups.pop();
        NetCliAuthFileListRequest(wp.first, wp.second, GotAuthSrvManifest, params);
    }
}

/////////////////////////////////////////////////////////////////////

class pfSecurePreloaderStream : public plZlibStream
{
    plOperationProgress* fProgress;
    bool                 fIsZipped;

public:

    pfSecurePreloaderStream(plOperationProgress* prog, bool zipped)
        : fProgress(prog), fIsZipped(zipped), plZlibStream()
    { 
        fOutput = new hsRAMStream;
    }

    ~pfSecurePreloaderStream()
    {
        delete fOutput;
        fOutput = nil;
        plZlibStream::Close();
    }

    bool AtEnd() { return fOutput->AtEnd(); }
    uint32_t GetEOF() { return fOutput->GetEOF(); }
    uint32_t GetPosition() const { return fOutput->GetPosition(); }
    uint32_t GetSizeLeft() const { return fOutput->GetSizeLeft(); }
    uint32_t Read(uint32_t count, void* buf) { return fOutput->Read(count, buf); }
    void Rewind() { fOutput->Rewind(); }
    void SetPosition(uint32_t pos) { fOutput->SetPosition(pos); }
    void Skip(uint32_t deltaByteCount) { fOutput->Skip(deltaByteCount); }

    uint32_t Write(uint32_t count, const void* buf)
    {
        if (fProgress)
            fProgress->Increment((float)count);
        if (fIsZipped)
            return plZlibStream::Write(count, buf);
        else
            return fOutput->Write(count, buf);
    }
};

/////////////////////////////////////////////////////////////////////

hsRAMStream* pfSecurePreloader::LoadToMemory(const plFileName& file) const
{
    if (!plFileInfo(file).Exists())
        return nil;

    hsUNIXStream s;
    hsRAMStream* ram = new hsRAMStream;
    s.Open(file);
    
    uint32_t loadLen = 1024 * 1024;
    uint8_t* buf = new uint8_t[loadLen];
    while (uint32_t read = s.Read(loadLen, buf))
        ram->Write(read, buf);
    delete[] buf;

    s.Close();
    ram->Rewind();
    return ram;
}

void pfSecurePreloader::SaveFile(hsStream* file, const plFileName& name) const
{
    hsUNIXStream s;
    s.Open(name, "wb");
    uint32_t pos = file->GetPosition();
    file->Rewind();

    uint32_t loadLen = 1024 * 1024;
    uint8_t* buf = new uint8_t[loadLen];
    while (uint32_t read = file->Read(loadLen, buf))
        s.Write(read, buf);
    file->SetPosition(pos);
    s.Close();
    delete[] buf;
}

bool pfSecurePreloader::IsZipped(const plFileName& filename) const
{
    return filename.GetFileExt().CompareI("gz") == 0;
}

void pfSecurePreloader::PreloadNextFile()
{
    if (fManifestEntries.empty())
    {
        Finish();
        return;
    }

    plFileName filename = fDownloadEntries.front();
    hsStream* s = new pfSecurePreloaderStream(fProgress, IsZipped(filename));
    
    // Thankfully, both callbacks have the same arguments
    if (fLegacyMode)
        NetCliAuthFileRequest(filename.AsString().ToWchar(), s, FileDownloaded, this);
    else
        NetCliFileDownloadRequest(filename.AsString().ToWchar(), s, FileDownloaded, this);
}

void pfSecurePreloader::Init()
{
    if (!fInstance)
        fInstance = new pfSecurePreloader;

    fInstance->RegisterAs(kSecurePreloader_KEY);
    // TODO: If we're going to support reconnects, then let's do it right.
    // Later...
    //plgDispatch::Dispatch()->RegisterForExactType(plNetCommAuthConnectedMsg::Index(), fInstance->GetKey());
}

void pfSecurePreloader::Start()
{
#ifndef PLASMA_EXTERNAL_RELEASE
    // Using local data? Move along, move along...
    if (gDataServerLocal)
    {
        Finish();
        return;
    }
#endif

    NetCliAuthGetEncryptionKey(fEncryptionKey, 4);
    
    // TODO: Localize
    fProgress = plProgressMgr::GetInstance()->RegisterOperation(0.0f, "Checking for Updates", plProgressMgr::kUpdateText, false, true);

    // Now, we need to fetch the "SecurePreloader" manifest from the file server, which will contain the python and SDL files.
    // We're basically reimplementing plResPatcher here, except preferring to keep everything in memory, then flush to disk 
    // when we're done. If this fails, then we shall download everything from the AuthSrv like in the old days.
    NetCliFileManifestRequest(GotFileSrvManifest, this, L"SecurePreloader");
}

void pfSecurePreloader::Terminate()
{
    FATAL("pfSecurePreloader failure");
    fProgress->SetAborting();

    plPreloaderMsg* msg = new plPreloaderMsg;
    msg->fSuccess = false;
    plgDispatch::Dispatch()->MsgSend(msg);
}

void pfSecurePreloader::Finish()
{
    plPreloaderMsg* msg = new plPreloaderMsg;
    msg->fSuccess = true;
    plgDispatch::Dispatch()->MsgSend(msg);
}

void pfSecurePreloader::Shutdown()
{
    SetInstance(nil);
    if (fProgress)
    {
        delete fProgress;
        fProgress = nil;
    }

    // Takes care of UnReffing us
    UnRegisterAs(kSecurePreloader_KEY);
}

void pfSecurePreloader::PreloadManifest(const NetCliAuthFileInfo manifestEntries[], uint32_t entryCount)
{
    uint32_t totalBytes = 0;
    if (fProgress)
        totalBytes = (uint32_t)fProgress->GetMax();
    fLegacyMode = true;

    for (uint32_t i = 0; i < entryCount; ++i)
    {
        const NetCliAuthFileInfo mfs = manifestEntries[i];
        plFileName filename = plString::FromWchar(mfs.filename);
        fDownloadEntries.push(filename);
        if (IsZipped(filename))
            fManifestEntries.push(filename.StripFileExt());
        else
            fManifestEntries.push(filename);

        totalBytes += mfs.filesize;
    }

    if (fProgress)
    {
        fProgress->SetLength((float)totalBytes);
        fProgress->SetTitle("Downloading...");
    }
}

void pfSecurePreloader::PreloadManifest(const NetCliFileManifestEntry manifestEntries[], uint32_t entryCount)
{
    uint32_t totalBytes = 0;
    for (uint32_t i = 0; i < entryCount; ++i)
    {
        const NetCliFileManifestEntry mfs = manifestEntries[i];
        bool fetchMe = true;
        hsRAMStream* s = nil;
        plFileName clientName = plString::FromWchar(mfs.clientName);
        plFileName downloadName = plString::FromWchar(mfs.downloadName);

        if (plFileInfo(clientName).Exists())
        {
            s = LoadToMemory(clientName);
            if (s)
            {
                // Damn this
                const char* md5 = hsWStringToString(mfs.md5);
                plMD5Checksum srvHash;
                srvHash.SetFromHexString(md5);
                delete[] md5;

                // Now actually copare the hashes
                plMD5Checksum lclHash;
                lclHash.CalcFromStream(s);
                fetchMe = (srvHash != lclHash);
            }
        }

        if (fetchMe)
        {
            fManifestEntries.push(clientName);
            fDownloadEntries.push(downloadName);
            if (IsZipped(downloadName))
                totalBytes += mfs.zipSize;
            else
                totalBytes += mfs.fileSize;
        } else {
            plSecureStream* ss = new plSecureStream(s, fEncryptionKey);
            plStreamSource::GetInstance()->InsertFile(clientName, ss);
        }

        if (s)
            delete s;
    }

    if (totalBytes && fProgress)
    {
        fProgress->SetLength((float)totalBytes);
        fProgress->SetTitle("Downloading...");
    }

    // This method uses only one manifest, so we're good to go now!
    PreloadNextFile();
}

void pfSecurePreloader::FilePreloaded(const wchar_t* file, hsStream* stream)
{
    // Clear out queue
    fDownloadEntries.pop();
    plFileName clientName = fManifestEntries.front();
    fManifestEntries.pop();

    if (!fLegacyMode) // AuthSrv data caching is useless
    {
        plFileSystem::CreateDir(clientName.StripFileName(), true);
        SaveFile(stream, clientName);
    }

    plSecureStream* ss = new plSecureStream(stream, fEncryptionKey);
    plStreamSource::GetInstance()->InsertFile(clientName, ss);
    delete stream;        // SecureStream holds its own decrypted buffer

    // Continue down the warpath
    PreloadNextFile();
}