90CNServer/client-patch/90CN_web_redirect.cpp

// ============================================================================
//  90CN_web_redirect.cpp  --  把客户端内嵌网页窗口跳到本地 GM 页面
//
//  背景：DNF 客户端里那个「小井盖 / 小助手」窗口是 IE 内核（窗口类链为
//        Browser Example -> Shell DocObject View -> Internet Explorer_Server），
//        地址在运行时拼接，客户端二进制与 PVF 里都没有明文域名，硬改字符串
//        不可行。所以这里不碰原地址，而是等控件创建出来后，直接把文档导航
//        到我们自己的页面。
//
//  做法：起一个后台线程轮询本进程内的 Internet Explorer_Server 窗口；一旦
//        发现新窗口，等原生导航落定，再用 WM_HTML_GETOBJECT + ObjectFromLresult
//        取到 IHTMLDocument2，经 IHTMLWindow2::execScript 执行
//        location.replace(...) 完成跳转。同一窗口只跳一次（force=1 时若发现
//        文档又跑到别的域名，会再次拉回）。
//
//  配置：DLL 同目录的 90CN_web.ini
//        [web]
//        enabled=1
//        url=http://127.0.0.1:18112/
//        force=0
//        delay=1200
//        没有配置文件时用上面的默认值（enabled=1）。
//
//  失败不影响游戏：任何一步取不到对象都只写日志，不会终止进程。
// ============================================================================

#include <windows.h>
#include <ole2.h>
#include <oleacc.h>
#include <mshtml.h>
#include <string>

// 90CN.cpp 里的 LogLine 在匿名 namespace 内（内部链接），所以走它导出的
// C 链接转发口，保证本模块的日志和安装流程写进同一个 90CN_trace.log。
extern "C" void __cdecl CnmLogLine(const char* format, ...);
#define LogLine CnmLogLine

namespace {

const wchar_t kIniName[] = L"90CN_web.ini";
const wchar_t kIeServerClass[] = L"Internet Explorer_Server";

struct WebConfig {
    bool enabled;
    bool force;
    int delayMs;
    std::wstring url;
};

WebConfig g_cfg = { true, false, 1200, L"http://127.0.0.1:18112/" };

DWORD g_threadId = 0;
volatile LONG g_stop = 0;

std::wstring WideFromAnsi(const char* s)
{
    if (!s || !*s) return std::wstring();
    int need = MultiByteToWideChar(CP_UTF8, 0, s, -1, nullptr, 0);
    if (need <= 1) {
        need = MultiByteToWideChar(CP_ACP, 0, s, -1, nullptr, 0);
        if (need <= 1) return std::wstring();
        std::wstring out(static_cast<size_t>(need - 1), L'\0');
        MultiByteToWideChar(CP_ACP, 0, s, -1, &out[0], need);
        return out;
    }
    std::wstring out(static_cast<size_t>(need - 1), L'\0');
    MultiByteToWideChar(CP_UTF8, 0, s, -1, &out[0], need);
    return out;
}

std::wstring ModuleDirectory()
{
    wchar_t path[MAX_PATH] = {};
    HMODULE self = nullptr;
    // 用数据地址反查自身模块：函数地址在某些加载方式下解析不到。
    if (!GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
                                GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
            reinterpret_cast<LPCWSTR>(&g_cfg), &self) ||
        !self) {
        return std::wstring();
    }
    if (!GetModuleFileNameW(self, path, MAX_PATH)) return std::wstring();
    std::wstring full(path);
    const size_t slash = full.find_last_of(L"\\/");
    return slash == std::wstring::npos ? std::wstring() : full.substr(0, slash + 1);
}

void LoadConfig()
{
    const std::wstring dir = ModuleDirectory();
    if (dir.empty()) {
        LogLine("web redirect: module dir unresolved, using built-in defaults");
        return;
    }
    const std::wstring ini = dir + kIniName;
    if (GetFileAttributesW(ini.c_str()) == INVALID_FILE_ATTRIBUTES) {
        LogLine("web redirect: %ls not found, defaults enabled=1 url=%ls", ini.c_str(), g_cfg.url.c_str());
        return;
    }

    const UINT enabled = GetPrivateProfileIntW(L"web", L"enabled", 1, ini.c_str());
    const UINT force = GetPrivateProfileIntW(L"web", L"force", 0, ini.c_str());
    const UINT delay = GetPrivateProfileIntW(L"web", L"delay", 1200, ini.c_str());

    wchar_t buf[1024] = {};
    GetPrivateProfileStringW(L"web", L"url", L"http://127.0.0.1:18112/", buf,
        static_cast<DWORD>(sizeof(buf) / sizeof(buf[0])), ini.c_str());

    g_cfg.enabled = enabled != 0;
    g_cfg.force = force != 0;
    g_cfg.delayMs = delay > 200 ? static_cast<int>(delay) : 200;
    if (buf[0]) g_cfg.url = buf;

    LogLine("web redirect: config enabled=%d force=%d delay=%d url=%ls",
        g_cfg.enabled ? 1 : 0, g_cfg.force ? 1 : 0, g_cfg.delayMs, g_cfg.url.c_str());
}

bool IsLocalUrl(const std::wstring& url)
{
    // 只认 "http://127.0.0.1:<port>/" 前缀，用来判断当前文档是否已经在我们的页面上。
    if (g_cfg.url.empty() || url.size() < g_cfg.url.size()) return false;
    return _wcsnicmp(url.c_str(), g_cfg.url.c_str(), g_cfg.url.size()) == 0;
}

struct FindContext {
    DWORD pid;
    HWND found;
};

BOOL CALLBACK OnChildWindow(HWND hwnd, LPARAM param)
{
    FindContext* ctx = reinterpret_cast<FindContext*>(param);
    wchar_t cls[128] = {};
    if (GetClassNameW(hwnd, cls, 128) && _wcsicmp(cls, kIeServerClass) == 0) {
        DWORD pid = 0;
        GetWindowThreadProcessId(hwnd, &pid);
        if (pid == ctx->pid) {
            ctx->found = hwnd;
            return FALSE;
        }
    }
    return TRUE;
}

BOOL CALLBACK OnTopWindow(HWND hwnd, LPARAM param)
{
    FindContext* ctx = reinterpret_cast<FindContext*>(param);
    DWORD pid = 0;
    GetWindowThreadProcessId(hwnd, &pid);
    if (pid != ctx->pid) return TRUE;
    EnumChildWindows(hwnd, OnChildWindow, param);
    return ctx->found ? FALSE : TRUE;
}

HWND FindIeServerWindow()
{
    FindContext ctx = { GetCurrentProcessId(), nullptr };
    EnumWindows(OnTopWindow, reinterpret_cast<LPARAM>(&ctx));
    return ctx.found;
}

// 取文档对象。WM_HTML_GETOBJECT 的返回值经 ObjectFromLresult 还原成接口指针。
IHTMLDocument2* GetDocument(HWND hwnd)
{
    static const UINT msg = RegisterWindowMessageW(L"WM_HTML_GETOBJECT");
    if (!msg) return nullptr;

    DWORD_PTR result = 0;
    const LRESULT ok = SendMessageTimeoutW(hwnd, msg, 0, 0,
        SMTO_ABORTIFHUNG | SMTO_BLOCK, 4000, &result);
    if (!ok || !result) return nullptr;

    IHTMLDocument2* doc = nullptr;
    if (FAILED(ObjectFromLresult(static_cast<LRESULT>(result), IID_IHTMLDocument2, 0,
            reinterpret_cast<void**>(&doc)))) {
        return nullptr;
    }
    return doc;
}

std::wstring DocumentUrl(IHTMLDocument2* doc)
{
    BSTR url = nullptr;
    std::wstring out;
    if (doc && SUCCEEDED(doc->get_URL(&url)) && url) {
        out.assign(url, SysStringLen(url));
    }
    if (url) SysFreeString(url);
    return out;
}

bool NavigateDocument(IHTMLDocument2* doc)
{
    IHTMLWindow2* win = nullptr;
    if (FAILED(doc->get_parentWindow(&win)) || !win) return false;

    // 用 location.replace 而不是 href：不往历史里塞记录，避免用户按返回键回到原页。
    std::wstring script = L"location.replace('";
    script += g_cfg.url;
    script += L"')";

    BSTR code = SysAllocString(script.c_str());
    BSTR lang = SysAllocString(L"JavaScript");
    VARIANT ret;
    VariantInit(&ret);
    HRESULT hr = win->execScript(code, lang, &ret);
    VariantClear(&ret);
    SysFreeString(code);
    SysFreeString(lang);
    win->Release();
    return SUCCEEDED(hr);
}

DWORD WINAPI WorkerThread(void*)
{
    CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);

    HWND lastHandled = nullptr;
    for (;;) {
        if (InterlockedCompareExchange(&g_stop, 0, 0) != 0) break;

        HWND hwnd = FindIeServerWindow();
        if (hwnd && hwnd != lastHandled) {
            LogLine("web redirect: IE_Server window found hwnd=%p, waiting %dms", (void*)hwnd, g_cfg.delayMs);
            // 等原生导航把文档对象建好，太早拿会拿到 about:blank。
            for (int waited = 0; waited < g_cfg.delayMs && !g_stop; waited += 100) {
                Sleep(100);
            }

            IHTMLDocument2* doc = GetDocument(hwnd);
            if (!doc) {
                LogLine("web redirect: document object unavailable hwnd=%p", (void*)hwnd);
                lastHandled = hwnd;  // 失败也不无限重试同一窗口
            } else {
                const std::wstring current = DocumentUrl(doc);
                LogLine("web redirect: current url=%ls", current.c_str());
                if (IsLocalUrl(current)) {
                    LogLine("web redirect: already on local page, skip");
                    lastHandled = hwnd;
                } else if (NavigateDocument(doc)) {
                    LogLine("web redirect: navigated to %ls", g_cfg.url.c_str());
                    lastHandled = hwnd;
                } else {
                    LogLine("web redirect: execScript failed hwnd=%p", (void*)hwnd);
                    lastHandled = hwnd;
                }
                doc->Release();
            }
        } else if (hwnd && hwnd == lastHandled && g_cfg.force) {
            // force 模式下防止用户点原生标签页跳走。
            IHTMLDocument2* doc = GetDocument(hwnd);
            if (doc) {
                if (!IsLocalUrl(DocumentUrl(doc))) {
                    if (NavigateDocument(doc)) LogLine("web redirect: pulled back to %ls", g_cfg.url.c_str());
                }
                doc->Release();
            }
        }

        if (!hwnd) lastHandled = nullptr;  // 窗口被销毁后允许下次重新接管
        for (int waited = 0; waited < 700 && !g_stop; waited += 100) {
            Sleep(100);
        }
    }

    CoUninitialize();
    return 0;
}

}  // namespace

extern "C" void InstallWebRedirect()
{
    LoadConfig();
    if (!g_cfg.enabled) {
        LogLine("web redirect: disabled by config");
        return;
    }
    if (g_cfg.url.find(L'\'') != std::wstring::npos) {
        LogLine("web redirect: url contains a quote, refused");
        return;
    }

    InterlockedExchange(&g_stop, 0);
    HANDLE thread = CreateThread(nullptr, 0, WorkerThread, nullptr, 0, &g_threadId);
    if (!thread) {
        LogLine("web redirect: CreateThread failed err=%u", GetLastError());
        return;
    }
    CloseHandle(thread);
    LogLine("web redirect: worker started tid=%u target=%ls", g_threadId, g_cfg.url.c_str());
}