Add UI master key setup and change flows

appstate/state.go

@@ -32,6 +32,11 @@ type LockableSession interface {
 	Unlock(vault.MasterKey) error
 }
 
+type MasterKeyChangeableSession interface {
+	CurrentSession
+	ChangeMasterKey(vault.MasterKey) error
+}
+
 type SaveableSession interface {
 	CurrentSession
 	Save() error
@@ -419,6 +424,20 @@ func (s *State) Unlock(key vault.MasterKey) error {
 	return session.Unlock(key)
 }
 
+func (s *State) ChangeMasterKey(key vault.MasterKey) error {
+	session, ok := s.Session.(MasterKeyChangeableSession)
+	if !ok {
+		return fmt.Errorf("session does not support master key changes")
+	}
+
+	if err := session.ChangeMasterKey(key); err != nil {
+		return err
+	}
+
+	s.Dirty = true
+	return nil
+}
+
 func (s *State) EnterGroup(name string) {
 	s.CurrentPath = append(append([]string(nil), s.CurrentPath...), name)
 	s.SelectedEntryID = ""