session-desktop/ts/session/messages/outgoing/controlMessage/group/ClosedGroupMessage.ts

import { SignalService } from '../../../../../protobuf';
import { PubKey } from '../../../../types';
import { DataMessage } from '../../DataMessage';
import { ExpirableMessageParams } from '../../ExpirableMessage';

export interface ClosedGroupMessageParams extends ExpirableMessageParams {
  groupId: string | PubKey;
}

export abstract class ClosedGroupMessage extends DataMessage {
  public readonly groupId: PubKey;

  constructor(params: ClosedGroupMessageParams) {
    super({
      createAtNetworkTimestamp: params.createAtNetworkTimestamp,
      identifier: params.identifier,
      expirationType: params.expirationType,
      expireTimer: params.expireTimer,
    });

    this.groupId = PubKey.cast(params.groupId);
    if (!this.groupId || this.groupId.key.length === 0) {
      throw new Error('groupId must be set');
    }
  }

  public static areAdminsMembers(admins: Array<string>, members: Array<string>) {
    return admins.every(a => members.includes(a));
  }

  public contentProto(): SignalService.Content {
    const content = super.contentProto();
    content.dataMessage = this.dataProto();
    // TODO legacy messages support will be removed in a future release
    // Closed Groups only support 'deleteAfterSend' and 'legacy'
    content.expirationType =
      this.expirationType === 'deleteAfterSend'
        ? SignalService.Content.ExpirationType.DELETE_AFTER_SEND
        : SignalService.Content.ExpirationType.UNKNOWN;

    return content;
  }

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

    dataMessage.closedGroupControlMessage =
      new SignalService.DataMessage.ClosedGroupControlMessage();

    return dataMessage;
  }
}