internal/ui: bug fix: dropping multiple files didn't work on Firefox and Safari

Closes #3045

internal/file/file_js.go

@@ -24,13 +24,24 @@ import (
 )
 
 type FileEntryFS struct {
-	rootEntry js.Value
+	rootEntries []js.Value
 }
 
-func NewFileEntryFS(root js.Value) *FileEntryFS {
-	return &FileEntryFS{
-		rootEntry: root,
+func NewFileEntryFS(rootEntries []js.Value) (*FileEntryFS, error) {
+	// Check all the full paths are the same.
+	var fullpath string
+	for _, ent := range rootEntries {
+		if fullpath == "" {
+			fullpath = ent.Get("fullPath").String()
+			continue
 		}
+		if fullpath != ent.Get("fullPath").String() {
+			return nil, errors.New("file: all the full paths must be the same")
+		}
+	}
+	return &FileEntryFS{
+		rootEntries: rootEntries,
+	}, nil
 }
 
 func (f *FileEntryFS) Open(name string) (fs.File, error) {
@@ -43,9 +54,27 @@ func (f *FileEntryFS) Open(name string) (fs.File, error) {
 	}
 
 	if name == "." {
-		return &dir{dirEntry: f.rootEntry}, nil
+		var dirName string
+		for _, ent := range f.rootEntries {
+			if dirName == "" {
+				dirName = ent.Get("name").String()
+				continue
+			}
+			if dirName != ent.Get("name").String() {
+				return nil, &fs.PathError{
+					Op:   "open",
+					Path: name,
+					Err:  errors.New("invalid directory"),
+				}
+			}
+		}
+		return &dir{
+			name:       dirName,
+			dirEntries: f.rootEntries,
+		}, nil
 	}
 
+	for _, ent := range f.rootEntries {
 		var chEntry chan js.Value
 		cbSuccess := js.FuncOf(func(this js.Value, args []js.Value) any {
 			chEntry <- args[0]
@@ -61,15 +90,19 @@ func (f *FileEntryFS) Open(name string) (fs.File, error) {
 		defer cbFailure.Release()
 
 		chEntry = make(chan js.Value)
-	f.rootEntry.Call("getFile", name, nil, cbSuccess, cbFailure)
+		ent.Call("getFile", name, nil, cbSuccess, cbFailure)
 		if entry := <-chEntry; entry.Truthy() {
 			return &file{entry: entry}, nil
 		}
 
 		chEntry = make(chan js.Value)
-	f.rootEntry.Call("getDirectory", name, nil, cbSuccess, cbFailure)
+		ent.Call("getDirectory", name, nil, cbSuccess, cbFailure)
 		if entry := <-chEntry; entry.Truthy() {
-		return &dir{dirEntry: entry}, nil
+			return &dir{
+				name:       entry.Get("name").String(),
+				dirEntries: []js.Value{entry},
+			}, nil
+		}
 	}
 
 	return nil, &fs.PathError{
@@ -163,21 +196,22 @@ func (f *file) Close() error {
 }
 
 type dir struct {
-	dirEntry    js.Value
+	name        string
+	dirEntries  []js.Value
 	fileEntries []js.Value
 	offset      int
 }
 
 func (d *dir) Stat() (fs.FileInfo, error) {
 	return &fileInfo{
-		name: d.dirEntry.Get("name").String(),
+		name: d.name,
 	}, nil
 }
 
 func (d *dir) Read(buf []byte) (int, error) {
 	return 0, &fs.PathError{
 		Op:   "read",
-		Path: d.dirEntry.Get("name").String(),
+		Path: d.name,
 		Err:  errors.New("is a directory"),
 	}
 }
@@ -188,6 +222,8 @@ func (d *dir) Close() error {
 
 func (d *dir) ReadDir(count int) ([]fs.DirEntry, error) {
 	if d.fileEntries == nil {
+		names := map[string]struct{}{}
+		for _, dirEntry := range d.dirEntries {
 			ch := make(chan struct{})
 			var rec js.Func
 			cb := js.FuncOf(func(this js.Value, args []js.Value) any {
@@ -198,21 +234,27 @@ func (d *dir) ReadDir(count int) ([]fs.DirEntry, error) {
 				}
 				for i := 0; i < entries.Length(); i++ {
 					ent := entries.Index(i)
+					name := ent.Get("name").String()
 					// A name can be empty when this directory is a root directory.
-				if ent.Get("name").String() == "" {
+					if name == "" {
+						continue
+					}
+					// Avoid entry duplications. Entry duplications happen when multiple files are dropped on Chrome.
+					if _, ok := names[name]; ok {
 						continue
 					}
 					if !ent.Get("isFile").Bool() && !ent.Get("isDirectory").Bool() {
 						continue
 					}
 					d.fileEntries = append(d.fileEntries, ent)
+					names[name] = struct{}{}
 				}
 				rec.Value.Call("call")
 				return nil
 			})
 			defer cb.Release()
 
-		reader := d.dirEntry.Call("createReader")
+			reader := dirEntry.Call("createReader")
 			rec = js.FuncOf(func(this js.Value, args []js.Value) any {
 				reader.Call("readEntries", cb)
 				return nil
@@ -222,6 +264,7 @@ func (d *dir) ReadDir(count int) ([]fs.DirEntry, error) {
 			rec.Value.Call("call")
 			<-ch
 		}
+	}
 
 	n := len(d.fileEntries) - d.offset
 

internal/ui/ui_js.go

@@ -707,14 +707,21 @@ func (u *UserInterface) appendDroppedFiles(data js.Value) {
 	defer u.dropFileM.Unlock()
 	items := data.Get("items")
 
+	var entries []js.Value
 	for i := 0; i < items.Length(); i++ {
 		kind := items.Index(i).Get("kind").String()
 		switch kind {
 		case "file":
-			fs := items.Index(i).Call("webkitGetAsEntry").Get("filesystem").Get("root")
-			u.inputState.DroppedFiles = file.NewFileEntryFS(fs)
+			entries = append(entries, items.Index(i).Call("webkitGetAsEntry").Get("filesystem").Get("root"))
+		}
+	}
+	if len(entries) > 0 {
+		fs, err := file.NewFileEntryFS(entries)
+		if err != nil {
+			u.setError(err)
 			return
 		}
+		u.inputState.DroppedFiles = fs
 	}
 }