backend: split layout code into own subpackage

internal/backend/layout/layout_rest.go

@@ -0,0 +1,54 @@
+package layout
+
+import "github.com/restic/restic/internal/restic"
+
+// RESTLayout implements the default layout for the REST protocol.
+type RESTLayout struct {
+	URL  string
+	Path string
+	Join func(...string) string
+}
+
+var restLayoutPaths = defaultLayoutPaths
+
+func (l *RESTLayout) String() string {
+	return "<RESTLayout>"
+}
+
+// Name returns the name for this layout.
+func (l *RESTLayout) Name() string {
+	return "rest"
+}
+
+// Dirname returns the directory path for a given file type and name.
+func (l *RESTLayout) Dirname(h restic.Handle) string {
+	if h.Type == restic.ConfigFile {
+		return l.URL + l.Join(l.Path, "/")
+	}
+
+	return l.URL + l.Join(l.Path, "/", restLayoutPaths[h.Type]) + "/"
+}
+
+// Filename returns a path to a file, including its name.
+func (l *RESTLayout) Filename(h restic.Handle) string {
+	name := h.Name
+
+	if h.Type == restic.ConfigFile {
+		name = "config"
+	}
+
+	return l.URL + l.Join(l.Path, "/", restLayoutPaths[h.Type], name)
+}
+
+// Paths returns all directory names
+func (l *RESTLayout) Paths() (dirs []string) {
+	for _, p := range restLayoutPaths {
+		dirs = append(dirs, l.URL+l.Join(l.Path, p))
+	}
+	return dirs
+}
+
+// Basedir returns the base dir name for files of type t.
+func (l *RESTLayout) Basedir(t restic.FileType) (dirname string, subdirs bool) {
+	return l.URL + l.Join(l.Path, restLayoutPaths[t]), false
+}