overleaf/services/clsi/app/js/OutputController.js

const logger = require('@overleaf/logger')
const OutputFileArchiveManager = require('./OutputFileArchiveManager')
const { expressify } = require('@overleaf/promise-utils')

function cleanFiles(files) {
  if (!Array.isArray(files)) {
    return []
  }
  return files.filter(file => /^output\./g.test(file))
}

async function createOutputZip(req, res) {
  const {
    project_id: projectId,
    user_id: userId,
    build_id: buildId,
  } = req.params
  const files = cleanFiles(req.query.files)
  logger.debug({ projectId, userId, buildId, files }, 'Will create zip file')

  const archive = await OutputFileArchiveManager.archiveFilesForBuild(
    projectId,
    userId,
    buildId,
    files
  )

  archive.on('error', err => {
    logger.warn({ err }, 'error emitted when creating output files archive')
  })

  res.attachment('output.zip')
  res.setHeader('X-Content-Type-Options', 'nosniff')
  archive.pipe(res)
}

module.exports = { createOutputZip: expressify(createOutputZip) }