New feature flag with ability to migrate GV1 groups

ts/state/smart/GroupV1MigrationDialog.tsx

@@ -0,0 +1,59 @@
+// Copyright 2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { connect } from 'react-redux';
+import { mapDispatchToProps } from '../actions';
+import {
+  GroupV1MigrationDialog,
+  PropsType as GroupV1MigrationDialogPropsType,
+} from '../../components/GroupV1MigrationDialog';
+import { ConversationType } from '../ducks/conversations';
+import { StateType } from '../reducer';
+import { getConversationSelector } from '../selectors/conversations';
+
+import { getIntl } from '../selectors/user';
+
+export type PropsType = {
+  readonly droppedMemberIds: Array<string>;
+  readonly invitedMemberIds: Array<string>;
+} & Omit<
+  GroupV1MigrationDialogPropsType,
+  'i18n' | 'droppedMembers' | 'invitedMembers'
+>;
+
+const mapStateToProps = (
+  state: StateType,
+  props: PropsType
+): GroupV1MigrationDialogPropsType => {
+  const getConversation = getConversationSelector(state);
+  const { droppedMemberIds, invitedMemberIds } = props;
+
+  const droppedMembers = droppedMemberIds
+    .map(getConversation)
+    .filter(Boolean) as Array<ConversationType>;
+  if (droppedMembers.length !== droppedMemberIds.length) {
+    window.log.warn(
+      'smart/GroupV1MigrationDialog: droppedMembers length changed'
+    );
+  }
+
+  const invitedMembers = invitedMemberIds
+    .map(getConversation)
+    .filter(Boolean) as Array<ConversationType>;
+  if (invitedMembers.length !== invitedMemberIds.length) {
+    window.log.warn(
+      'smart/GroupV1MigrationDialog: invitedMembers length changed'
+    );
+  }
+
+  return {
+    ...props,
+    droppedMembers,
+    invitedMembers,
+    i18n: getIntl(state),
+  };
+};
+
+const smart = connect(mapStateToProps, mapDispatchToProps);
+
+export const SmartGroupV1MigrationDialog = smart(GroupV1MigrationDialog);