src: use CP_UTF8 for wide file names on win32

`src/node_modules.cc` needs to be consistent with `src/node_file.cc` in
how it translates the utf8 strings to `std::wstring` otherwise we might
end up in situation where we can read the source code of imported
package from disk, but fail to recognize that it is an ESM (or CJS) and
cause runtime errors. This type of error is possible on Windows when the
path contains unicode characters and "Language for non-Unicode programs"
is set to "Chinese (Traditional, Taiwan)".

See: #58768
PR-URL: #60575
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Stefan Stojanovic <stefan.stojanovic@janeasystems.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>

Author: indutny

src/compile_cache.cc

@@ -232,10 +232,8 @@ static std::string GetRelativePath(std::string_view path,
 // the paths to wide strings before using std::filesystem::path.
 // On other platforms, std::filesystem::path can handle UTF-8 directly.
 #ifdef _WIN32
-  std::filesystem::path module_path(
-      ConvertToWideString(std::string(path), CP_UTF8));
-  std::filesystem::path base_path(
-      ConvertToWideString(std::string(base), CP_UTF8));
+  std::filesystem::path module_path(ConvertUTF8ToWideString(std::string(path)));
+  std::filesystem::path base_path(ConvertUTF8ToWideString(std::string(base)));
 #else
   std::filesystem::path module_path(path);
   std::filesystem::path base_path(base);

src/node_file.cc

@@ -3184,42 +3184,6 @@ static void GetFormatOfExtensionlessFile(
   return args.GetReturnValue().Set(EXTENSIONLESS_FORMAT_JAVASCRIPT);
 }
 
-#ifdef _WIN32
-#define BufferValueToPath(str)                                                 \
-  std::filesystem::path(ConvertToWideString(str.ToString(), CP_UTF8))
-
-std::string ConvertWideToUTF8(const std::wstring& wstr) {
-  if (wstr.empty()) return std::string();
-
-  int size_needed = WideCharToMultiByte(CP_UTF8,
-                                        0,
-                                        &wstr[0],
-                                        static_cast<int>(wstr.size()),
-                                        nullptr,
-                                        0,
-                                        nullptr,
-                                        nullptr);
-  std::string strTo(size_needed, 0);
-  WideCharToMultiByte(CP_UTF8,
-                      0,
-                      &wstr[0],
-                      static_cast<int>(wstr.size()),
-                      &strTo[0],
-                      size_needed,
-                      nullptr,
-                      nullptr);
-  return strTo;
-}
-
-#define PathToString(path) ConvertWideToUTF8(path.wstring());
-
-#else  // _WIN32
-
-#define BufferValueToPath(str) std::filesystem::path(str.ToStringView());
-#define PathToString(path) path.native();
-
-#endif  // _WIN32
-
 static void CpSyncCheckPaths(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
   Isolate* isolate = env->isolate();
@@ -3232,15 +3196,15 @@ static void CpSyncCheckPaths(const FunctionCallbackInfo<Value>& args) {
   THROW_IF_INSUFFICIENT_PERMISSIONS(
       env, permission::PermissionScope::kFileSystemRead, src.ToStringView());
 
-  auto src_path = BufferValueToPath(src);
+  auto src_path = src.ToPath();
 
   BufferValue dest(isolate, args[1]);
   CHECK_NOT_NULL(*dest);
   ToNamespacedPath(env, &dest);
   THROW_IF_INSUFFICIENT_PERMISSIONS(
       env, permission::PermissionScope::kFileSystemWrite, dest.ToStringView());
 
-  auto dest_path = BufferValueToPath(dest);
+  auto dest_path = dest.ToPath();
   bool dereference = args[2]->IsTrue();
   bool recursive = args[3]->IsTrue();
 
@@ -3269,8 +3233,8 @@ static void CpSyncCheckPaths(const FunctionCallbackInfo<Value>& args) {
       (src_status.type() == std::filesystem::file_type::directory) ||
       (dereference && src_status.type() == std::filesystem::file_type::symlink);
 
-  auto src_path_str = PathToString(src_path);
-  auto dest_path_str = PathToString(dest_path);
+  auto src_path_str = ConvertPathToUTF8(src_path);
+  auto dest_path_str = ConvertPathToUTF8(dest_path);
 
   if (!error_code) {
     // Check if src and dest are identical.
@@ -3365,7 +3329,7 @@ static bool CopyUtimes(const std::filesystem::path& src,
   uv_fs_t req;
   auto cleanup = OnScopeLeave([&req]() { uv_fs_req_cleanup(&req); });
 
-  auto src_path_str = PathToString(src);
+  auto src_path_str = ConvertPathToUTF8(src);
   int result = uv_fs_stat(nullptr, &req, src_path_str.c_str(), nullptr);
   if (is_uv_error(result)) {
     env->ThrowUVException(result, "stat", nullptr, src_path_str.c_str());
@@ -3376,7 +3340,7 @@ static bool CopyUtimes(const std::filesystem::path& src,
   const double source_atime = s->st_atim.tv_sec + s->st_atim.tv_nsec / 1e9;
   const double source_mtime = s->st_mtim.tv_sec + s->st_mtim.tv_nsec / 1e9;
 
-  auto dest_file_path_str = PathToString(dest);
+  auto dest_file_path_str = ConvertPathToUTF8(dest);
   int utime_result = uv_fs_utime(nullptr,
                                  &req,
                                  dest_file_path_str.c_str(),
@@ -3511,7 +3475,7 @@ static void CpSyncCopyDir(const FunctionCallbackInfo<Value>& args) {
     std::error_code error;
     for (auto dir_entry : std::filesystem::directory_iterator(src)) {
       auto dest_file_path = dest / dir_entry.path().filename();
-      auto dest_str = PathToString(dest);
+      auto dest_str = ConvertPathToUTF8(dest);
 
       if (dir_entry.is_symlink()) {
         if (verbatim_symlinks) {
@@ -3570,7 +3534,7 @@ static void CpSyncCopyDir(const FunctionCallbackInfo<Value>& args) {
               }
             } else if (std::filesystem::is_regular_file(dest_file_path)) {
               if (!dereference || (!force && error_on_exist)) {
-                auto dest_file_path_str = PathToString(dest_file_path);
+                auto dest_file_path_str = ConvertPathToUTF8(dest_file_path);
                 env->ThrowStdErrException(
                     std::make_error_code(std::errc::file_exists),
                     "cp",

src/node_modules.cc

@@ -296,22 +296,24 @@ const BindingData::PackageConfig* BindingData::TraverseParent(
 
     // Stop the search when the process doesn't have permissions
     // to walk upwards
-    if (is_permissions_enabled &&
-        !env->permission()->is_granted(
-            env,
-            permission::PermissionScope::kFileSystemRead,
-            current_path.generic_string())) [[unlikely]] {
-      return nullptr;
+    if (is_permissions_enabled) {
+      if (!env->permission()->is_granted(
+              env,
+              permission::PermissionScope::kFileSystemRead,
+              ConvertGenericPathToUTF8(current_path))) [[unlikely]] {
+        return nullptr;
+      }
     }
 
     // Check if the path ends with `/node_modules`
-    if (current_path.generic_string().ends_with("/node_modules")) {
+    if (current_path.filename() == "node_modules") {
       return nullptr;
     }
 
     auto package_json_path = current_path / "package.json";
+
     auto package_json =
-        GetPackageJSON(realm, package_json_path.string(), nullptr);
+        GetPackageJSON(realm, ConvertPathToUTF8(package_json_path), nullptr);
     if (package_json != nullptr) {
       return package_json;
     }
@@ -333,20 +335,12 @@ void BindingData::GetNearestParentPackageJSONType(
 
   ToNamespacedPath(realm->env(), &path_value);
 
-  std::string path_value_str = path_value.ToString();
+  auto path = path_value.ToPath();
+
   if (slashCheck) {
-    path_value_str.push_back(kPathSeparator);
+    path /= "";
   }
 
-  std::filesystem::path path;
-
-#ifdef _WIN32
-  std::wstring wide_path = ConvertToWideString(path_value_str, GetACP());
-  path = std::filesystem::path(wide_path);
-#else
-  path = std::filesystem::path(path_value_str);
-#endif
-
   auto package_json = TraverseParent(realm, path);
 
   if (package_json == nullptr) {

src/util-inl.h

@@ -718,19 +718,71 @@ inline bool IsWindowsBatchFile(const char* filename) {
   return !extension.empty() && (extension == "cmd" || extension == "bat");
 }
 
-inline std::wstring ConvertToWideString(const std::string& str,
-                                        UINT code_page) {
+inline std::wstring ConvertUTF8ToWideString(const std::string& str) {
   int size_needed = MultiByteToWideChar(
-      code_page, 0, &str[0], static_cast<int>(str.size()), nullptr, 0);
+      CP_UTF8, 0, &str[0], static_cast<int>(str.size()), nullptr, 0);
   std::wstring wstrTo(size_needed, 0);
-  MultiByteToWideChar(code_page,
+  MultiByteToWideChar(CP_UTF8,
                       0,
                       &str[0],
                       static_cast<int>(str.size()),
                       &wstrTo[0],
                       size_needed);
   return wstrTo;
 }
+
+std::string ConvertWideStringToUTF8(const std::wstring& wstr) {
+  if (wstr.empty()) return std::string();
+
+  int size_needed = WideCharToMultiByte(CP_UTF8,
+                                        0,
+                                        &wstr[0],
+                                        static_cast<int>(wstr.size()),
+                                        nullptr,
+                                        0,
+                                        nullptr,
+                                        nullptr);
+  std::string strTo(size_needed, 0);
+  WideCharToMultiByte(CP_UTF8,
+                      0,
+                      &wstr[0],
+                      static_cast<int>(wstr.size()),
+                      &strTo[0],
+                      size_needed,
+                      nullptr,
+                      nullptr);
+  return strTo;
+}
+
+template <typename T, size_t kStackStorageSize>
+std::filesystem::path MaybeStackBuffer<T, kStackStorageSize>::ToPath() const {
+  std::wstring wide_path = ConvertUTF8ToWideString(ToString());
+  return std::filesystem::path(wide_path);
+}
+
+std::string ConvertPathToUTF8(const std::filesystem::path& path) {
+  return ConvertWideStringToUTF8(path.wstring());
+}
+
+std::string ConvertGenericPathToUTF8(const std::filesystem::path& path) {
+  return ConvertWideStringToUTF8(path.generic_wstring());
+}
+
+#else  // _WIN32
+
+template <typename T, size_t kStackStorageSize>
+std::filesystem::path MaybeStackBuffer<T, kStackStorageSize>::ToPath() const {
+  return std::filesystem::path(ToStringView());
+}
+
+std::string ConvertPathToUTF8(const std::filesystem::path& path) {
+  return path.native();
+}
+
+std::string ConvertGenericPathToUTF8(const std::filesystem::path& path) {
+  return path.generic_string();
+}
+
 #endif  // _WIN32
 
 inline v8::MaybeLocal<v8::Object> NewDictionaryInstance(

src/util.h

@@ -507,6 +507,8 @@ class MaybeStackBuffer {
   inline std::basic_string_view<T> ToStringView() const {
     return {out(), length()};
   }
+  // This can only be used if the buffer contains path data in UTF8
+  inline std::filesystem::path ToPath() const;
 
  private:
   size_t length_;
@@ -1038,9 +1040,15 @@ class JSONOutputStream final : public v8::OutputStream {
 // Returns true if OS==Windows and filename ends in .bat or .cmd,
 // case insensitive.
 inline bool IsWindowsBatchFile(const char* filename);
-inline std::wstring ConvertToWideString(const std::string& str, UINT code_page);
+inline std::wstring ConvertUTF8ToWideString(const std::string& str);
+inline std::string ConvertWideStringToUTF8(const std::wstring& wstr);
+
 #endif  // _WIN32
 
+inline std::filesystem::path ConvertUTF8ToPath(const std::string& str);
+inline std::string ConvertPathToUTF8(const std::filesystem::path& path);
+inline std::string ConvertGenericPathToUTF8(const std::filesystem::path& path);
+
 // A helper to create a new instance of the dictionary template.
 // Unlike v8::DictionaryTemplate::NewInstance, this method will
 // check that all properties have been set (are not empty MaybeLocals)