Handle incoming power level events and add EnsureInvited()

intent.go

@@ -231,3 +231,13 @@ func (intent *IntentAPI) SetAvatarURL(avatarURL string) error {
 	}
 	return intent.Client.SetAvatarURL(avatarURL)
 }
+
+func (intent *IntentAPI) EnsureInvited(roomID, userID string) error {
+	if !intent.as.StateStore.IsInvited(roomID, userID) {
+		_, err := intent.Client.InviteUser(roomID, &gomatrix.ReqInviteUser{
+			UserID: userID,
+		})
+		return err
+	}
+	return nil
+}

statestore.go

@@ -30,6 +30,8 @@ func (as *AppService) UpdateState(evt *gomatrix.Event) {
 	switch evt.Type {
 	case gomatrix.StateMember:
 		as.StateStore.SetMembership(evt.RoomID, evt.GetStateKey(), evt.Content.Membership)
+	case gomatrix.StatePowerLevels:
+		as.StateStore.SetPowerLevels(evt.RoomID, &evt.Content.PowerLevels)
 	}
 }