Function serveRawFsMiddleware

packages/vite/src/node/server/middlewares/static.ts:201–243

(
  server: ViteDevServer,
)

}

export function serveRawFsMiddleware(
  server: ViteDevServer,
): Connect.NextHandleFunction {
  const serveFromRoot = sirv(
    '/',
    sirvOptions({
      config: server.config,
      getHeaders: () => server.config.server.headers,
    }),
  )

  // Keep the named function. The name is visible in debug logs via `DEBUG=connect:dispatcher ...`
  return function viteServeRawFsMiddleware(req, res, next) {
    // In some cases (e.g. linked monorepos) files outside of root will
    // reference assets that are also out of served root. In such cases
    // the paths are rewritten to `/@fs/` prefixed paths and must be served by
    // searching based from fs root.
    if (req.url!.startsWith(FS_PREFIX)) {
      const url = new URL(req.url!, 'http://example.com')
      const pathname = decodeURIIfPossible(url.pathname)
      if (pathname === undefined) {
        return next()
      }

      let newPathname = pathname.slice(FS_PREFIX.length)
      if (isWindows) newPathname = newPathname.replace(/^[A-Z]:/i, '')
      url.pathname = encodeURI(newPathname)
      req.url = url.href.slice(url.origin.length)

      try {
        serveFromRoot(req, res, next)
      } catch (e) {
        if (e && 'code' in e && e.code === ERR_DENIED_FILE) {
          respondWithAccessDenied(e.path, server, res)
          return
        }
        throw e
      }
    } else {
      next()
    }
  }
}

/**
 * Check if the url is allowed to be served, via the `server.fs` config.