Add webdav using the fuse implementation

internal/webdav/dir.go

@@ -0,0 +1,103 @@
+package webdav
+
+import (
+	"context"
+	"io"
+	"os"
+
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+	"github.com/restic/restic/internal/debug"
+	"golang.org/x/net/webdav"
+)
+
+type fuseDir interface {
+	fs.Node
+	fs.HandleReadDirAller
+	fs.NodeStringLookuper
+}
+
+// RepoDir implements a read-only directory
+type RepoDir struct {
+	name string
+	dir  fuseDir
+	ctx  context.Context
+}
+
+// statically ensure that RepoDir implements webdav.File
+var _ webdav.File = &RepoDir{}
+
+func (f *RepoDir) Write(p []byte) (int, error) {
+	return 0, webdav.ErrForbidden
+}
+
+// Close closes the repo file.
+func (f *RepoDir) Close() error {
+	debug.Log("Close %v", f.name)
+	return nil
+}
+
+// Read reads up to len(p) byte from the file.
+func (f *RepoDir) Read(p []byte) (int, error) {
+	debug.Log("")
+	return 0, io.EOF
+}
+
+// Seek sets the offset for the next Read or Write to offset, interpreted
+// according to whence: SeekStart means relative to the start of the file,
+// SeekCurrent means relative to the current offset, and SeekEnd means relative
+// to the end. Seek returns the new offset relative to the start of the file
+// and an error, if any.
+func (f *RepoDir) Seek(offset int64, whence int) (int64, error) {
+	debug.Log("Seek %v", f.name)
+	return 0, webdav.ErrForbidden
+}
+
+// Readdir reads the contents of the directory associated with file and returns
+// a slice of up to n FileInfo values, as would be returned by Lstat, in
+// directory order. Subsequent calls on the same file will yield further
+// FileInfos.
+//
+// If n > 0, Readdir returns at most n FileInfo structures. In this case, if
+// Readdir returns an empty slice, it will return a non-nil error explaining
+// why. At the end of a directory, the error is io.EOF.
+//
+// If n <= 0, Readdir returns all the FileInfo from the directory in a single
+// slice. In this case, if Readdir succeeds (reads all the way to the end of
+// the directory), it returns the slice and a nil error. If it encounters an
+// error before the end of the directory, Readdir returns the FileInfo read
+// until that point and a non-nil error.
+func (f *RepoDir) Readdir(count int) (entries []os.FileInfo, err error) {
+	debug.Log("Readdir %v, count %d", f.name, count)
+
+	dirent, err := f.dir.ReadDirAll(f.ctx)
+	entries = make([]os.FileInfo, 0, len(dirent))
+	for _, node := range dirent {
+		if node.Name == "." || node.Name == ".." {
+			continue
+		}
+
+		fsNode, err := f.dir.Lookup(f.ctx, node.Name)
+		if err != nil {
+			return nil, err
+		}
+
+		var attr fuse.Attr
+		err = fsNode.Attr(f.ctx, &attr)
+		if err != nil {
+			return nil, err
+		}
+
+		entries = append(entries, fileInfoFromAttr(node.Name, attr))
+	}
+	return entries, nil
+}
+
+// Stat returns a FileInfo describing the named file.
+func (f *RepoDir) Stat() (os.FileInfo, error) {
+	debug.Log("Stat %v", f.name)
+	var attr fuse.Attr
+	f.dir.Attr(f.ctx, &attr)
+
+	return fileInfoFromAttr(f.name, attr), nil
+}