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

import { DataMessage } from '../DataMessage';
import { SignalService } from '../../../../../../protobuf';
import { TextEncoder } from 'util';
import { MessageParams } from '../../../Message';

interface ClosedGroupMessageParams extends MessageParams {
  groupId: string;
}

export abstract class ClosedGroupMessage extends DataMessage {
  protected readonly groupId: string;

  constructor(params: ClosedGroupMessageParams) {
    super({
      timestamp: params.timestamp,
      identifier: params.identifier,
    });
    this.groupId = params.groupId;
  }

  protected abstract groupContextType(): SignalService.GroupContext.Type;

  protected groupContext(): SignalService.GroupContext {
    const id = new TextEncoder().encode(this.groupId);
    const type = this.groupContextType();

    return new SignalService.GroupContext({ id, type });
  }

  protected dataProto(): SignalService.DataMessage {
    const dataMessage = new SignalService.DataMessage();
    dataMessage.group = this.groupContext();

    return dataMessage;
  }
}