Function linksHandler

lib/header.mjs:41–81

(req, res, next)

}

export async function linksHandler (req, res, next) {
  const ldp = req.app.locals.ldp
  let filename
  try {
    // Hack: createIfNotExists is set to true for PUT or PATCH requests
    // because the file might not exist yet at this point.
    // But it will be created afterwards.
    // This should be improved with the new server architecture.
    ({ path: filename } = await ldp.resourceMapper
      .mapUrlToFile({ url: req, createIfNotExists: req.method === 'PUT' || req.method === 'PATCH' }))
  } catch (e) {
    // Silently ignore errors here
    // Later handlers will error as well, but they will be able to given a more concrete error message (like 400 or 404)
    return next()
  }

  if (path.extname(filename) === ldp.suffixMeta) {
    debug.metadata('Trying to access metadata file as regular file.')

    return next(HTTPError(404, 'Trying to access metadata file as regular file'))
  }
  const fileMetadata = new metadata.Metadata()
  if (req.path.endsWith('/')) {
    // do not add storage header in serverUri
    if (req.path === '/') fileMetadata.isStorage = true
    fileMetadata.isContainer = true
    fileMetadata.isBasicContainer = true
  } else {
    fileMetadata.isResource = true
  }
  // Add LDP-required Accept-Post header for OPTIONS request to containers
  if (fileMetadata.isContainer && req.method === 'OPTIONS') {
    res.header('Accept-Post', '*/*')
  }
  // Add ACL and Meta Link in header
  addLink(res, pathBasename(req.path) + ldp.suffixAcl, 'acl')
  addLink(res, pathBasename(req.path) + ldp.suffixMeta, 'describedBy')
  // Add other Link headers
  addLinks(res, fileMetadata)
  next()
}

export function parseMetadataFromHeader (linkHeader) {
  const fileMetadata = new metadata.Metadata()