From d97a1be9722fb356d374b860555e710897e627b8 Mon Sep 17 00:00:00 2001
From: Whindmar Saksit <whindsaks@proton.me>
Date: Tue, 25 Jun 2024 03:33:45 +0200
Subject: [PATCH] [SHLWAPI][EXPLORER] Implement OS_SERVERADMINUI

---
 base/shell/explorer/explorer.cpp | 37 ++++++++++++++++++++++++++++++++
 dll/win32/shlwapi/ordinal.c      | 13 +++++++++++
 2 files changed, 50 insertions(+)

diff --git a/base/shell/explorer/explorer.cpp b/base/shell/explorer/explorer.cpp
index 140a1e93ffa..9576f995d5b 100644
--- a/base/shell/explorer/explorer.cpp
+++ b/base/shell/explorer/explorer.cpp
@@ -49,6 +49,41 @@ static VOID InitializeAtlModule(HINSTANCE hInstance, BOOL bInitialize)
     }
 }
 
+static BOOL
+GetServerAdminUIDefault()
+{
+    BOOL server;
+    DWORD value = 0, size = sizeof(value);
+    LPCWSTR rosregpath = L"SYSTEM\\CurrentControlSet\\Control\\ReactOS\\Settings\\Version";
+    if (SHGetValueW(HKEY_LOCAL_MACHINE, rosregpath, L"ReportAsWorkstation", NULL, &value, &size) == NO_ERROR)
+        server = value == 0;
+    else
+        server = IsOS(OS_ANYSERVER);
+    return server && IsUserAnAdmin();
+}
+
+static void
+InitializeServerAdminUI()
+{
+    HKEY hKey = SHGetShellKey(SHKEY_Root_HKCU | SHKEY_Key_Explorer, L"Advanced", TRUE);
+    if (hKey)
+    {
+        DWORD value, size = sizeof(value), type;
+        DWORD error = SHGetValueW(hKey, NULL, L"ServerAdminUI", &type, &value, &size);
+        if (error || type != REG_DWORD || size != sizeof(value))
+        {
+            value = GetServerAdminUIDefault();
+            if (value)
+            {
+                // TODO: Apply registry tweaks with RegInstallW; RegServerAdmin in the REGINST resource in shell32.
+                SystemParametersInfo(SPI_SETKEYBOARDCUES, 0, IntToPtr(TRUE), SPIF_SENDCHANGE | SPIF_UPDATEINIFILE);
+            }
+            SHSetValueW(hKey, NULL, L"ServerAdminUI", REG_DWORD, &value, sizeof(value));
+        }
+        RegCloseKey(hKey);
+    }
+}
+
 #if !WIN7_DEBUG_MODE
 static BOOL
 SetShellReadyEvent(IN LPCWSTR lpEventName)
@@ -199,6 +234,8 @@ StartWithDesktop(IN HINSTANCE hInstance)
     if (!SetShellReadyEvent(L"msgina: ShellReadyEvent"))
         SetShellReadyEvent(L"Global\\msgina: ShellReadyEvent");
 
+    InitializeServerAdminUI();
+
     if (DoStartStartupItems(Tray))
     {
         ProcessStartupItems();
diff --git a/dll/win32/shlwapi/ordinal.c b/dll/win32/shlwapi/ordinal.c
index 3646c54153c..1aa73bc16c2 100644
--- a/dll/win32/shlwapi/ordinal.c
+++ b/dll/win32/shlwapi/ordinal.c
@@ -4225,8 +4225,21 @@ BOOL WINAPI IsOS(DWORD feature)
         FIXME("(OS_TABLETPC) What should we return here?\n");
         return FALSE;
     case OS_SERVERADMINUI:
+#ifdef __REACTOS__
+        {
+            DWORD value = FALSE, size = sizeof(value);
+            HKEY hKey = SHGetShellKey(SHKEY_Root_HKCU | SHKEY_Key_Explorer, L"Advanced", FALSE);
+            if (hKey)
+            {
+                SHQueryValueExW(hKey, L"ServerAdminUI", NULL, NULL, &value, &size);
+                RegCloseKey(hKey);
+            }
+            ISOS_RETURN(value);
+        }
+#else
         FIXME("(OS_SERVERADMINUI) What should we return here?\n");
         return FALSE;
+#endif
     case OS_MEDIACENTER:
         FIXME("(OS_MEDIACENTER) What should we return here?\n");
         return FALSE;