added webdav

pkg/fs/webdav.go

@@ -0,0 +1,53 @@
+package fs
+
+import (
+	"context"
+	"os"
+
+	"golang.org/x/net/webdav"
+)
+
+type WebDavFile struct {
+	*File
+}
+
+func (*WebDavFile) Write(_ []byte) (int, error) {
+	return 0, os.ErrPermission
+}
+
+type WebDavFS struct {
+	fs *FS
+}
+
+func NewWebDavFS(fs *FS) *WebDavFS {
+	return &WebDavFS{fs}
+}
+
+func (*WebDavFS) Mkdir(_ context.Context, _ string, _ os.FileMode) error {
+	return os.ErrPermission
+}
+func (*WebDavFS) RemoveAll(_ context.Context, _ string) error {
+	return os.ErrPermission
+}
+func (*WebDavFS) Rename(_ context.Context, _, _ string) error {
+	return os.ErrPermission
+}
+
+func (w *WebDavFS) OpenFile(_ context.Context, name string, flags int, _ os.FileMode) (webdav.File, error) {
+	//O_WRONLY int = syscall.O_WRONLY // open the file write-only.
+	//O_RDWR   int = syscall.O_RDWR   // open the file read-write.
+	//O_APPEND int = syscall.O_APPEND // append data to the file when writing.
+	//O_CREATE int = syscall.O_CREAT  // create a new file if none exists.
+	//O_EXCL   int = syscall.O_EXCL   // used with O_CREATE, file must not exist.
+	if flags&os.O_RDWR == os.O_RDWR ||
+		flags&os.O_CREATE == os.O_CREATE ||
+		flags&os.O_TRUNC == os.O_TRUNC {
+		return nil, os.ErrPermission
+	}
+	f, err := w.fs.OpenFile(name)
+	return &WebDavFile{f}, err
+}
+
+func (w *WebDavFS) Stat(_ context.Context, name string) (os.FileInfo, error) {
+	return w.fs.Stat(name)
+}