Day 27：群組事件與檔案訊息接收

// 略
const webhookEventHandlerMap = {
  message: (event) => this.handleMessageEvent(event),
  follow: (event) => this.handleFollowEvent(event),
  unfollow: (event) => this.handleUnfollowEvent(event),
  join: (event) => this.handleJoinEvent(event),
  leave: (event) => this.handleLeaveEvent(event),
  memberJoined: (event) => this.handleMemberJoinedEvent(event),
  memberLeft: (event) => this.handleMemberLeftEvent(event),
} satisfies Partial<WebhookEventHandlerMap>;

private async handleJoinEvent(event: JoinEvent): Promise<void> {
  const replyMessage = this.lineMessageService.createTextMessage({
    text: '機器人已加入群組或聊天室，請多指教！',
  });

  await this.lineClient.replyMessage({
    replyToken: event.replyToken,
    messages: [replyMessage],
  });
}

private async handleLeaveEvent(event: LeaveEvent): Promise<void> {
  const { source } = event;
  console.log(`機器人已離開群組或聊天室 ${JSON.stringify(source)}`);
}

private async handleMemberJoinedEvent(event: MemberJoinEvent): Promise<void> {
  const replyMessage = this.lineMessageService.createTextMessage({
    text: '歡迎新成員加入！',
  });

  await this.lineClient.replyMessage({
    replyToken: event.replyToken,
    messages: [replyMessage],
  });
}

private async handleMemberLeftEvent(event: MemberLeaveEvent): Promise<void> {
  const { left } = event;
  console.log(`成員已離開：${JSON.stringify(left)}`);
}

{
  // 略
  "source": {
    "type": "group",
    "groupId": "C00da164ef4a4b88e3e6419af6b4b981c"
  }
}

  private async handleMessageEvent(event: MessageEvent): Promise<void> {
    const messageEventHandlerMap = {
      file: () =>
        this.lineMessageService.createTextMessage({
          text: '收到檔案囉，但目前還不支援喔～',
      }),
    } satisfies MessageEventHandlerMap;

{
  "event": {
    "type": "message",
    "message": {
      "type": "file",
      "id": "582616131509420205",
      "fileName": "2025 鐵人賽.pdf",
      "fileSize": 2106585,
      "contentProvider": {
        "type": "line"
      }
    }
    // 略
  }
}