Method downloadTelegramFile

src/runtime/adapters/telegram.ts:396–417

* Download a file from Telegram and save it locally.

(
    fileId: string,
    channelId: string,
    filename: string,
    mimeType?: string,
  )

   * Download a file from Telegram and save it locally.
   */
  private async downloadTelegramFile(
    fileId: string,
    channelId: string,
    filename: string,
    mimeType?: string,
  ): Promise<ChannelAttachment | null> {
    if (!this.bot) return null;

    try {
      const fileLink = await this.bot.getFileLink(fileId);
      return await downloadAndSaveAttachment(
        this.rootDir,
        channelId,
        fileLink,
        filename,
        mimeType,
      );
    } catch (err) {
      console.error(`[Telegram] Failed to download file ${fileId}:`, err);
      return null;
    }
  }

  /**
   * Send a file to the Telegram chat.