Function downloadHandler

src/dashboard/routes.ts:145–186

(client: DocumentEngineClient, req: Request, res: Response)

 * File download handler
 */
export async function downloadHandler(client: DocumentEngineClient, req: Request, res: Response) {
  try {
    const paramId = req.params.id;
    const documentId = Array.isArray(paramId) ? paramId[0] : paramId;

    if (!documentId) {
      return res.status(400).send(errorTemplate('Document ID is required'));
    }

    // Get document info to get the title for the filename
    const documentInfo = await client['fetch-document-info']({ documentId });

    // Check if document info exists and has title
    const documentData = documentInfo.data.data;
    if (!documentData) {
      throw new Error(`No document data returned for document ID: ${documentId}`);
    }

    const documentTitle = documentData.title || 'document';
    const safeFilename = documentTitle.replace(/[^a-z0-9]/gi, '_').toLowerCase() + '.pdf';

    // Download the document as PDF with proper binary response handling
    const response = await client['download-document-pdf']({ documentId }, undefined, {
      responseType: 'arraybuffer',
    });

    // Set headers for file download
    res.setHeader('Content-Type', 'application/pdf');
    res.setHeader('Content-Disposition', `attachment; filename="${safeFilename}"`);

    res.send(Buffer.from(response.data));
  } catch (error) {
    logger.error(null, 'Document download error', { error });
    res
      .status(500)
      .send(
        errorTemplate(
          `An error occurred while downloading the document: ${error instanceof Error ? error.message : 'Unknown error'}`
        )
      );
  }
}

/**
 * File delete handler