session-desktop/ts/session/messages/outgoing/content/data/group/ClosedGroupRemovedMembersMessage.ts

import { Constants } from '../../../../..';
import { SignalService } from '../../../../../../protobuf';
import { fromHexToArray } from '../../../../../utils/String';
import {
  ClosedGroupMessage,
  ClosedGroupMessageParams,
} from './ClosedGroupMessage';

interface ClosedGroupRemovedMembersMessageParams
  extends ClosedGroupMessageParams {
  removedMembers: Array<string>;
}

export class ClosedGroupRemovedMembersMessage extends ClosedGroupMessage {
  private readonly removedMembers: Array<string>;

  constructor(params: ClosedGroupRemovedMembersMessageParams) {
    super({
      timestamp: params.timestamp,
      identifier: params.identifier,
      groupId: params.groupId,
      expireTimer: params.expireTimer,
    });
    this.removedMembers = params.removedMembers;
    if (!this.removedMembers?.length) {
      throw new Error('removedMembers cannot be empty');
    }
  }

  public dataProto(): SignalService.DataMessage {
    const dataMessage = super.dataProto();

    // tslint:disable: no-non-null-assertion
    dataMessage.closedGroupControlMessage!.type =
      SignalService.DataMessage.ClosedGroupControlMessage.Type.MEMBERS_REMOVED;
    dataMessage.closedGroupControlMessage!.members = this.removedMembers.map(
      fromHexToArray
    );

    return dataMessage;
  }

  public ttl(): number {
    return Constants.TTL_DEFAULT.REGULAR_MESSAGE;
  }
}