localPackages.winjob: implement read owner of file on Windows

local/pkgs/winjob/CMakeLists.txt

@@ -16,7 +16,7 @@ find_package(Boost REQUIRED COMPONENTS headers filesystem)
 find_package(nlohmann_json REQUIRED)
 find_package(range-v3 REQUIRED)
 
-add_executable(winjob src/winjob.cpp)
+add_executable(winjob src/winjob.cpp src/windows.cpp)
 # target_compile_features(winjob PRIVATE cxx_std_26)
 target_compile_options(winjob PRIVATE "-std=c++26")
 target_include_directories(winjob PRIVATE ${PROJECT_SOURCE_DIR}/include)

local/pkgs/winjob/include/winjob/windows.hpp

@@ -0,0 +1,8 @@
+# include <optional>
+# include <string>
+# include <utility>
+
+namespace winjob
+{
+  std::optional<std::pair<std::string, std::string>> get_owner(const std::string& file_name);
+}

local/pkgs/winjob/src/windows.cpp

@@ -0,0 +1,58 @@
+# include <winjob/windows.hpp>
+# include <windows.h>
+# include <tchar.h>
+# include <accctrl.h>
+# include <aclapi.h>
+
+namespace winjob
+{
+  std::optional<std::pair<std::string, std::string>> get_owner(const std::string& file_name)
+  {
+    DWORD dwRtnCode = 0;
+    PSID pSidOwner = NULL;
+    BOOL bRtnBool = TRUE;
+    LPTSTR AcctName = NULL;
+    LPTSTR DomainName = NULL;
+    DWORD dwAcctName = 1, dwDomainName = 1;
+    SID_NAME_USE eUse = SidTypeUnknown;
+    HANDLE hFile;
+    PSECURITY_DESCRIPTOR pSD = NULL;
+
+    // Get the handle of the file object.
+    hFile = CreateFile
+      (file_name.c_str(), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+
+    // Check GetLastError for CreateFile error code.
+    if (hFile == INVALID_HANDLE_VALUE) return {};
+
+    // Get the owner SID of the file.
+    dwRtnCode = GetSecurityInfo(hFile, SE_FILE_OBJECT, OWNER_SECURITY_INFORMATION, &pSidOwner, NULL, NULL, NULL, &pSD);
+
+    // Check GetLastError for GetSecurityInfo error condition.
+    if (dwRtnCode != ERROR_SUCCESS) return {};
+
+    // First call to LookupAccountSid to get the buffer sizes.
+    bRtnBool = LookupAccountSid
+      (NULL, pSidOwner, AcctName, (LPDWORD)&dwAcctName, DomainName, (LPDWORD)&dwDomainName, &eUse);
+
+    // Reallocate memory for the buffers.
+    AcctName = (LPTSTR)GlobalAlloc(GMEM_FIXED, dwAcctName * sizeof(wchar_t));
+
+    // Check GetLastError for GlobalAlloc error condition.
+    if (AcctName == NULL) return {};
+
+    DomainName = (LPTSTR)GlobalAlloc(GMEM_FIXED, dwDomainName * sizeof(wchar_t));
+
+    // Check GetLastError for GlobalAlloc error condition.
+    if (DomainName == NULL) return {};
+
+    // Second call to LookupAccountSid to get the account name.
+    bRtnBool = LookupAccountSid
+      (NULL, pSidOwner, AcctName, (LPDWORD)&dwAcctName, DomainName, (LPDWORD)&dwDomainName, &eUse);
+
+    // Check GetLastError for LookupAccountSid error condition.
+    if (bRtnBool == FALSE) return {};
+
+    return std::make_pair(std::string(DomainName), std::string(AcctName));
+  }
+}