Fix generation counters (#3391)

backend/internal/adapters/fs/files/files.go

@@ -674,6 +674,9 @@ func DeleteFiles(source, boundIndexPath, indexPath string, isDir bool) error {
 		return err
 	}
 
+	if isDir {
+		indexing.ClearRealPathCaches()
+	}
 	index.InvalidateRealPathCache(deleteIndexPath, boundIndexPath)
 	if parent := utils.GetParentDirectoryPath(deleteIndexPath); parent != "" && parent != "/" {
 		index.InvalidateRealPathCache(parent, boundIndexPath)
@@ -807,6 +810,9 @@ func moveResourceImpl(isSrcDir bool, sourceIndex, destIndex, realsrc, realdst st
 	if err != nil {
 		return err
 	}
+	if isSrcDir {
+		indexing.ClearRealPathCaches()
+	}
 
 	// Handle SOURCE cleanup (treat as deletion)
 	// Run async to avoid blocking the HTTP response

backend/internal/database/access/resolved.go

@@ -2,6 +2,8 @@ package access
 
 import (
 	"os"
+	"path/filepath"
+	"strings"
 
 	"github.com/gtsteffaniak/filebrowser/backend/internal/utils"
 	"github.com/gtsteffaniak/filebrowser/backend/pkg/indexing"
@@ -13,7 +15,22 @@ func (s *Storage) PermittedAtRealPath(index *indexing.Index, username, realPath
 	if s == nil || index == nil || username == "" || realPath == "" {
 		return false
 	}
-	indexPath := index.MakeIndexPath(realPath, isDir).String()
+	lexical := realPath
+	if !strings.HasPrefix(realPath, index.Path) {
+		root, err := filepath.EvalSymlinks(index.Path)
+		if err != nil {
+			return false
+		}
+		rel, err := filepath.Rel(root, realPath)
+		if err != nil || rel == ".." || strings.HasPrefix(rel, ".."+string(filepath.Separator)) {
+			return false
+		}
+		lexical = index.Path
+		if rel != "." {
+			lexical = filepath.Join(index.Path, rel)
+		}
+	}
+	indexPath := index.MakeIndexPath(lexical, isDir).String()
 	return s.Permitted(index.Path, utils.IndexPathFromNormalized(indexPath, true), username)
 }
 

backend/internal/database/access/resolved_test.go

@@ -88,6 +88,37 @@ func TestPermittedAtRealPath_DeniesCopySourceResolved(t *testing.T) {
 	}
 }
 
+func TestPermittedAtRealPath_SymlinkedSourceRoot(t *testing.T) {
+	sourceRoot, _, _, user := setupSymlinkDenyFixture(t)
+	linkRoot := filepath.Join(filepath.Dir(sourceRoot), "root-link")
+	if err := os.Symlink(sourceRoot, linkRoot); err != nil {
+		t.Skipf("symlinks required: %v", err)
+	}
+	if _, err := filepath.EvalSymlinks(linkRoot); err != nil {
+		t.Fatal(err)
+	}
+	settings.Config.Server.SourceMap = map[string]*settings.Source{
+		linkRoot: {Path: linkRoot, Config: settings.SourceConfig{DenyByDefault: false}},
+	}
+	store := NewStorage(nil)
+	if err := store.DenyUser(linkRoot, utils.IndexPathFromNormalized("/bob", true), user); err != nil {
+		t.Fatal(err)
+	}
+	idx := &indexing.Index{Source: settings.Source{Path: linkRoot}}
+
+	realPath, _, err := idx.GetRealPathScoped("/", "/alice/link.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	realPath, err = filepath.EvalSymlinks(realPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if store.PermittedAtRealPath(idx, user, realPath, false) {
+		t.Fatal("resolved target under denied /bob must not be permitted with symlinked source root")
+	}
+}
+
 func TestIsDirAtRealPath(t *testing.T) {
 	dir := t.TempDir()
 	if err := os.MkdirAll(filepath.Join(dir, "nested"), 0o755); err != nil {

backend/internal/preview/image.go

@@ -465,6 +465,9 @@ func getEmbeddedThumbnail(in io.Reader) ([]byte, io.Reader, error) {
 	}
 
 	if orientStr != "" && orientStr != "1" {
+		if !embeddedPreviewWithinLimits(thm) {
+			return nil, wrappedReader, fmt.Errorf("embedded thumbnail exceeds decode limits")
+		}
 		thm = applyOrientationToPreviewBytes(thm, orientStr)
 	}
 

backend/internal/web/archive.go

@@ -288,6 +288,9 @@ func archiveCreateHandler(w http.ResponseWriter, r *http.Request, d *Context) (i
 	if err != nil {
 		return http.StatusBadRequest, fmt.Errorf("destination path invalid: %v", err)
 	}
+	if !state.AccessPermittedAtRealPath(idxTo, d.User.Username, destFileReal, false) {
+		return http.StatusForbidden, fmt.Errorf("access denied to destination %s", req.Destination)
+	}
 	if err = os.MkdirAll(filepath.Dir(destFileReal), fileutils.EffectiveDirPerm()); err != nil {
 		return http.StatusInternalServerError, fmt.Errorf("cannot create destination parent directory: %v", err)
 	}
@@ -1269,6 +1272,7 @@ func extractArchivedSymlink(destRoot, destPath, target string, modTime time.Time
 		logger.Debugf("unarchive: symlink: %v", err)
 		return fmt.Errorf("failed to create symlink from archive entry")
 	}
+	indexing.ClearRealPathCaches()
 	return applyArchivedTimesAndPerm(destPath, fs.ModeSymlink, modTime)
 }
 

backend/internal/web/archive_create_access_test.go

@@ -0,0 +1,86 @@
+package web
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/gtsteffaniak/filebrowser/backend/internal/state"
+	"github.com/gtsteffaniak/filebrowser/backend/internal/utils"
+	"github.com/gtsteffaniak/filebrowser/backend/pkg/settings"
+)
+
+func TestArchiveCreate_DeniesResolvedSymlinkDestination(t *testing.T) {
+	_, sourceRoot, sourceName, username := setupExtractAccessPolicyTest(t)
+	if err := state.DenyUser(sourceRoot, utils.IndexPathFromNormalized("/denied", true), username); err != nil {
+		t.Fatal(err)
+	}
+	allowedDir := filepath.Join(sourceRoot, "allowed")
+	deniedDir := filepath.Join(sourceRoot, "denied")
+	for _, dir := range []string{allowedDir, deniedDir} {
+		if err := os.MkdirAll(dir, 0o755); err != nil {
+			t.Fatal(err)
+		}
+	}
+	victim := filepath.Join(deniedDir, "victim")
+	if err := os.WriteFile(victim, []byte("keep"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(sourceRoot, "a.txt"), []byte("payload"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	link := filepath.Join(allowedDir, "report.zip")
+	if err := os.Symlink(filepath.Join("..", "denied", "victim"), link); err != nil {
+		t.Fatal(err)
+	}
+
+	user, err := state.GetUserByUsername(username)
+	if err != nil {
+		t.Fatal(err)
+	}
+	settings.Config.Server.SourceMap[sourceRoot].Config.DenyByDefault = false
+
+	body := `{"fromSource":"` + sourceName + `","paths":["/a.txt"],"destination":"/allowed/report.zip","format":"zip"}`
+	req := httptest.NewRequest(http.MethodPost, "/api/resources/archive", strings.NewReader(body))
+	rec := httptest.NewRecorder()
+	status, handlerErr := archiveCreateHandler(rec, req, &Context{User: &user})
+	if status != http.StatusForbidden || handlerErr == nil {
+		t.Fatalf("status=%d err=%v", status, handlerErr)
+	}
+	got, err := os.ReadFile(victim)
+	if err != nil || string(got) != "keep" {
+		t.Fatalf("victim content=%q err=%v", got, err)
+	}
+}
+
+func TestArchiveCreate_AllowsNonSymlinkDestination(t *testing.T) {
+	_, sourceRoot, sourceName, username := setupExtractAccessPolicyTest(t)
+	dest := filepath.Join(sourceRoot, "out.zip")
+	if err := os.WriteFile(filepath.Join(sourceRoot, "a.txt"), []byte("payload"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	user, err := state.GetUserByUsername(username)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	body := `{"fromSource":"` + sourceName + `","paths":["/a.txt"],"destination":"/out.zip","format":"zip"}`
+	req := httptest.NewRequest(http.MethodPost, "/api/resources/archive", strings.NewReader(body))
+	rec := httptest.NewRecorder()
+	status, handlerErr := archiveCreateHandler(rec, req, &Context{User: &user})
+	if status != http.StatusOK || handlerErr != nil {
+		t.Fatalf("status=%d err=%v body=%s", status, handlerErr, rec.Body.String())
+	}
+	var resp map[string]string
+	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := os.Stat(dest); err != nil {
+		t.Fatalf("expected archive at %s: %v", dest, err)
+	}
+}

backend/internal/web/media.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/gtsteffaniak/filebrowser/backend/internal/adapters/fs/files"
 	"github.com/gtsteffaniak/filebrowser/backend/internal/ffmpeg"
+	"github.com/gtsteffaniak/filebrowser/backend/internal/state"
 	"github.com/gtsteffaniak/filebrowser/backend/internal/utils"
 	"github.com/gtsteffaniak/filebrowser/backend/pkg/indexing"
 	"github.com/gtsteffaniak/filebrowser/backend/pkg/settings"
@@ -125,6 +126,9 @@ func subtitlesHandler(w http.ResponseWriter, r *http.Request, d *Context) (int,
 			if err != nil {
 				return realPathErrStatus(err), err
 			}
+			if !state.AccessPermittedAtRealPath(idx, d.ShareUser.Username, subtitlePath, false) {
+				return http.StatusForbidden, fmt.Errorf("access denied")
+			}
 		} else {
 			subtitlePath = filepath.Join(filepath.Dir(fileInfo.RealPath), filepath.Base(track.Name))
 		}

backend/internal/web/media_subtitles_test.go

@@ -242,6 +242,54 @@ func TestSubtitlesHandler_ShareSingleFileLoadsSidecar(t *testing.T) {
 	}
 }
 
+func TestSubtitlesHandler_ShareDeniesSidecarSymlinkToDeniedTarget(t *testing.T) {
+	sourceRoot, adminUser := setupSubtitlesHTTPTest(t)
+	sharedDir := filepath.Join(sourceRoot, "shared")
+	privateDir := filepath.Join(sourceRoot, "private")
+	for _, dir := range []string{sharedDir, privateDir} {
+		if err := os.MkdirAll(dir, 0755); err != nil {
+			t.Fatal(err)
+		}
+	}
+	secret := filepath.Join(privateDir, "clip.srt")
+	if err := os.WriteFile(secret, []byte("SECRET_DENIED_SUBTITLE"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	videoPath := filepath.Join(sharedDir, "clip.mov")
+	if err := os.WriteFile(videoPath, []byte("video"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.Symlink(filepath.Join("..", "private", "clip.srt"), filepath.Join(sharedDir, "clip.srt")); err != nil {
+		t.Fatal(err)
+	}
+	if err := state.DenyUser(sourceRoot, utils.IndexPathFromNormalized("/private", true), "admin"); err != nil {
+		t.Fatal(err)
+	}
+	mockVideoWithExternalSubtitle(t, "clip.srt", videoPath)
+
+	adminUser.BackendScopes = []users.BackendScope{{Path: sourceRoot, Scope: "/"}}
+	req := httptest.NewRequest(http.MethodGet, "/public/api/media/subtitles?hash=h&path=clip.mov&name=clip.srt&embedded=false", nil)
+	rec := httptest.NewRecorder()
+	status, handlerErr := subtitlesHandler(rec, req, &Context{
+		User:      adminUser,
+		ShareUser: adminUser,
+		IndexPath: "/shared/clip.mov/",
+		Share: share.Share{
+			ShareColumns: share.ShareColumns{
+				Hash: "h",
+				Path: "/shared",
+			},
+			SourcePath: sourceRoot,
+		},
+	})
+	if status != http.StatusForbidden {
+		t.Fatalf("status=%d err=%v body=%q", status, handlerErr, rec.Body.String())
+	}
+	if strings.Contains(rec.Body.String(), "SECRET_DENIED_SUBTITLE") {
+		t.Fatalf("response leaked denied subtitle")
+	}
+}
+
 func TestSubtitlesHandler_ShareRejectsSidecarPastEscapingDirSymlink(t *testing.T) {
 	sourceRoot, adminUser := setupSubtitlesHTTPTest(t)
 	videoIndexPath := "/shared/link/clip.mov/"

backend/internal/web/preview.go

@@ -16,6 +16,7 @@ import (
 	"github.com/gtsteffaniak/filebrowser/backend/internal/adapters/fs/files"
 	"github.com/gtsteffaniak/filebrowser/backend/internal/preview"
 	"github.com/gtsteffaniak/filebrowser/backend/internal/utils"
+	"github.com/gtsteffaniak/filebrowser/backend/pkg/indexing"
 	"github.com/gtsteffaniak/filebrowser/backend/pkg/indexing/iteminfo"
 	"github.com/gtsteffaniak/filebrowser/backend/pkg/settings"
 	"github.com/gtsteffaniak/go-logger/logger"
@@ -226,6 +227,27 @@ func getDirectoryPreview(ctx context.Context, r *http.Request, d *Context, frame
 	if err != nil {
 		return nil, err
 	}
+	if d.Share.Hash != "" {
+		idx := indexing.GetIndex(source)
+		if idx == nil {
+			return nil, fmt.Errorf("source not available")
+		}
+		userScope, scopeErr := d.ShareUser.GetScopeForSourceName(source)
+		if scopeErr != nil {
+			return nil, scopeErr
+		}
+		shareRel := strings.TrimPrefix(d.Share.Path, userScope)
+		bound := utils.JoinScopedIndexPath(userScope, shareRel)
+		childIndexPath := utils.JoinScopedIndexPath(userScope, path)
+		realPath, _, rerr := idx.GetRealPathScoped(bound, childIndexPath)
+		if rerr != nil {
+			if index != 0 {
+				return getDirectoryPreview(ctx, r, d, 0)
+			}
+			return nil, rerr
+		}
+		fileInfo.RealPath = realPath
+	}
 	tempCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
 	_, previewErr := preview.GetPreviewForFile(tempCtx, *fileInfo, "small", "", 0)
 	cancel()

backend/internal/web/preview_share_directory_test.go

@@ -0,0 +1,70 @@
+package web
+
+import (
+	"context"
+	"errors"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/gtsteffaniak/filebrowser/backend/internal/database/share"
+	"github.com/gtsteffaniak/filebrowser/backend/internal/database/users"
+	commonerrors "github.com/gtsteffaniak/filebrowser/backend/internal/errors"
+	"github.com/gtsteffaniak/filebrowser/backend/pkg/indexing"
+	"github.com/gtsteffaniak/filebrowser/backend/pkg/indexing/iteminfo"
+)
+
+func TestGetDirectoryPreview_ShareRejectsSymlinkChildOutsideShare(t *testing.T) {
+	sourceRoot, adminUser := setupSubtitlesHTTPTest(t)
+	sharedDir := filepath.Join(sourceRoot, "shared")
+	privateDir := filepath.Join(sourceRoot, "private")
+	for _, dir := range []string{sharedDir, privateDir} {
+		if err := os.MkdirAll(dir, 0o755); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := os.WriteFile(filepath.Join(privateDir, "secret.jpg"), []byte{0xff, 0xd8, 0xff, 0xd9}, 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.Symlink(filepath.Join("..", "private", "secret.jpg"), filepath.Join(sharedDir, "link.jpg")); err != nil {
+		t.Fatal(err)
+	}
+
+	ctx := context.Background()
+	req := httptest.NewRequest("GET", "/", nil)
+	adminUser.BackendScopes = []users.BackendScope{{Path: sourceRoot, Scope: "/"}}
+	d := &Context{
+		User:      adminUser,
+		ShareUser: adminUser,
+		IndexPath: "/shared/",
+		Share: share.Share{
+			ShareColumns: share.ShareColumns{Hash: "h", Path: "/shared"},
+			SourcePath:   sourceRoot,
+		},
+		FileInfo: iteminfo.ExtendedFileInfo{
+			Source: "Downloads",
+			FileInfo: iteminfo.FileInfo{
+				Path: "/shared/",
+				ItemInfo: iteminfo.ItemInfo{
+					Type: "directory",
+				},
+				Files: []iteminfo.ExtendedItemInfo{
+					{ItemInfo: iteminfo.ItemInfo{Name: "link.jpg", Type: "image/jpeg", HasPreview: true}},
+				},
+			},
+		},
+	}
+	idx := indexing.GetIndex("Downloads")
+	if idx == nil {
+		t.Fatal("missing index")
+	}
+
+	_, err := getDirectoryPreview(ctx, req, d, 0)
+	if err == nil {
+		t.Fatal("expected scope error for share child symlink outside share root")
+	}
+	if !errors.Is(err, commonerrors.ErrPathEscapesScope) {
+		t.Fatalf("error=%v want ErrPathEscapesScope", err)
+	}
+}

backend/internal/web/resource.go

@@ -1595,6 +1595,15 @@ func ResourcePatchHandler(w http.ResponseWriter, r *http.Request, d *Context) (i
 		// Auto-rename if requested
 		if req.Rename {
 			realDest = addVersionSuffix(realDest)
+			if !state.AccessPermittedAtRealPath(dstIdx, d.User.Username, realDest, isSrcDir) {
+				item.Message = "access denied to destination path"
+				if d.Share.Hash != "" {
+					response.Failed = append(response.Failed, MoveCopyItem{Message: item.Message})
+					continue
+				}
+				response.Failed = append(response.Failed, moveCopyWithClientPaths(item, clientFromPath, clientToPath))
+				continue
+			}
 		}
 
 		// Validate move/rename operation to prevent circular references

backend/internal/web/resource_patch_rename_access_test.go

@@ -0,0 +1,60 @@
+package web
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/gtsteffaniak/filebrowser/backend/internal/state"
+	"github.com/gtsteffaniak/filebrowser/backend/internal/utils"
+)
+
+func TestResourcePatchHandler_CopyRename_DeniesDeniedVersionSuffix(t *testing.T) {
+	_, sourceRoot, sourceName, username := setupExtractAccessPolicyTest(t)
+	destDir := filepath.Join(sourceRoot, "dest")
+	if err := os.MkdirAll(destDir, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	src := filepath.Join(sourceRoot, "src.txt")
+	if err := os.WriteFile(src, []byte("src"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	existing := filepath.Join(destDir, "report.txt")
+	if err := os.WriteFile(existing, []byte("existing"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	denied := filepath.Join(destDir, "report(1).txt")
+	if err := state.DenyUser(sourceRoot, utils.IndexPathFromNormalized("/dest/report(1).txt", false), username); err != nil {
+		t.Fatal(err)
+	}
+
+	user, err := state.GetUserByUsername(username)
+	if err != nil {
+		t.Fatal(err)
+	}
+	body := `{"action":"copy","rename":true,"items":[{"fromSource":"` + sourceName +
+		`","fromPath":"/src.txt","toSource":"` + sourceName + `","toPath":"/dest/report.txt"}]}`
+	req := httptest.NewRequest(http.MethodPatch, "/api/resources", strings.NewReader(body))
+	rec := httptest.NewRecorder()
+	status, handlerErr := ResourcePatchHandler(rec, req, &Context{User: &user})
+	if handlerErr != nil {
+		t.Fatalf("err=%v", handlerErr)
+	}
+	if status != http.StatusInternalServerError && status != http.StatusOK {
+		t.Fatalf("status=%d body=%s", status, rec.Body.String())
+	}
+	var resp MoveCopyResponse
+	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
+		t.Fatal(err)
+	}
+	if len(resp.Failed) != 1 || !strings.Contains(resp.Failed[0].Message, "access denied") {
+		t.Fatalf("failed=%+v", resp.Failed)
+	}
+	if _, err := os.Stat(denied); err == nil {
+		t.Fatal("denied destination file should not exist")
+	}
+}

backend/pkg/indexing/indexingFiles.go

@@ -8,6 +8,7 @@ import (
 	"runtime"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/gtsteffaniak/filebrowser/backend/internal/adapters/fs/fileutils"
@@ -23,8 +24,9 @@ import (
 )
 
 var (
-	RealPathCache = cache.NewCache[string](48*time.Hour, 72*time.Hour)
-	IsDirCache    = cache.NewCache[bool](48*time.Hour, 72*time.Hour)
+	RealPathCache      = cache.NewCache[string](48*time.Hour, 72*time.Hour)
+	IsDirCache         = cache.NewCache[bool](48*time.Hour, 72*time.Hour)
+	realPathGeneration atomic.Uint64
 )
 
 // getDiskUsage returns the actual disk space used by a file in bytes
@@ -1221,6 +1223,7 @@ func (idx *Index) getRealPathInternal(boundIndexPath string, enforceScope bool,
 	if ok && cached != "" {
 		return cached, isDir, nil
 	}
+	generation := realPathGeneration.Load()
 	absolutePath, err := filepath.Abs(joinedPath)
 	if err != nil {
 		return absolutePath, false, fmt.Errorf("could not get real path: %v, %s", joinedPath, err)
@@ -1238,6 +1241,10 @@ func (idx *Index) getRealPathInternal(boundIndexPath string, enforceScope bool,
 	}
 	RealPathCache.Set(cacheKey, realPath)
 	IsDirCache.Set(cacheKey+":isdir", isDir)
+	if realPathGeneration.Load() != generation {
+		RealPathCache.Delete(cacheKey)
+		IsDirCache.Delete(cacheKey + ":isdir")
+	}
 	return realPath, isDir, nil
 }
 
@@ -1263,10 +1270,19 @@ func realPathCacheIndexAncestors(indexPath string) []string {
 	return ancestors
 }
 
+// ClearRealPathCaches drops every cached symlink resolution. The cache library has no
+// prefix delete, so subtree invalidation uses a full clear; entries repopulate lazily.
+func ClearRealPathCaches() {
+	realPathGeneration.Add(1)
+	RealPathCache.ClearAll()
+	IsDirCache.ClearAll()
+}
+
 // InvalidateRealPathCache drops cached symlink resolutions for indexPath and its
 // ancestors. scopeBounds should include any caller scope prefixes used with
 // GetRealPathScoped (e.g. user or share path).
 func (idx *Index) InvalidateRealPathCache(indexPath string, scopeBounds ...string) {
+	realPathGeneration.Add(1)
 	boundSet := map[string]struct{}{"/": {}, "": {}}
 	for _, b := range scopeBounds {
 		b = strings.TrimRight(strings.TrimSpace(b), "/")

backend/pkg/indexing/symlink_containment_test.go

@@ -164,6 +164,42 @@ func TestGetRealPathScoped_CacheKeyDoesNotCollideWithUnscoped(t *testing.T) {
 	}
 }
 
+func TestRealPathCacheGeneration_BumpsOnInvalidateAndClear(t *testing.T) {
+	idx := symlinkTestIndex(t.TempDir())
+	gen := realPathGeneration.Load()
+	idx.InvalidateRealPathCache("/any")
+	if realPathGeneration.Load() != gen+1 {
+		t.Fatalf("InvalidateRealPathCache: gen=%d want %d", realPathGeneration.Load(), gen+1)
+	}
+	gen = realPathGeneration.Load()
+	ClearRealPathCaches()
+	if realPathGeneration.Load() != gen+1 {
+		t.Fatalf("ClearRealPathCaches: gen=%d want %d", realPathGeneration.Load(), gen+1)
+	}
+}
+
+func TestClearRealPathCaches_ClearsWarmEntries(t *testing.T) {
+	sourceRoot, userScope := setupSymlinkEscapeFixture(t)
+	idx := symlinkTestIndex(sourceRoot)
+
+	userDir := filepath.Join(sourceRoot, "user1")
+	if err := os.WriteFile(filepath.Join(userDir, "foo"), []byte("x"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if _, _, err := idx.GetRealPathScoped(userScope, "/user1/foo"); err != nil {
+		t.Fatalf("warm cache: %v", err)
+	}
+	joined := filepath.Join(sourceRoot, "user1", "foo")
+	key := fmt.Sprintf("realpath|scoped=%t|bound=%q|path=%q", true, userScope, joined)
+	if _, ok := RealPathCache.Get(key); !ok {
+		t.Fatalf("expected cache key %q", key)
+	}
+	ClearRealPathCaches()
+	if _, ok := RealPathCache.Get(key); ok {
+		t.Fatal("ClearRealPathCaches should drop warm entries")
+	}
+}
+
 func TestInvalidateRealPathCache_ClearsGetRealPathEntry(t *testing.T) {
 	sourceRoot, userScope := setupSymlinkEscapeFixture(t)
 	idx := symlinkTestIndex(sourceRoot)

frontend/scripts/sync-translations.js

@@ -2,7 +2,7 @@
 import path from 'node:path';
 import { globSync } from 'node:fs';
 import { fileURLToPath } from 'node:url';
-import { Translator } from 'deepl-node';
+import { DeepLClient } from 'deepl-node';
 import fs from 'fs-extra';
 
 // Parse command line arguments
@@ -27,7 +27,7 @@ if (requireApiKey && !DEEPL_API_KEY) {
   process.exit(1);
 }
 
-const translator = requireApiKey ? new Translator(DEEPL_API_KEY) : null;
+const translator = requireApiKey ? new DeepLClient(DEEPL_API_KEY) : null;
 
 const deeplLangMap = {
   'zh-cn': 'ZH-HANS',