doccano/frontend/middleware/check-admin.js

import _ from 'lodash'

export default _.debounce(async function({ app, store, route, redirect }) {
  try {
    await store.dispatch('projects/setCurrentProject', route.params.id)
  } catch(e) {
    redirect('/projects')
  }
  const userId = store.getters['auth/getUserId']
  const isProjectAdmin = await app.$services.member.isProjectAdmin(route.params.id, userId)
  const projectRoot = app.localePath('/projects/' + route.params.id)
  const path = route.fullPath.replace(/\/$/g, '')

  if (isProjectAdmin || path === projectRoot || path.startsWith(projectRoot + '/dataset')) {
    return
  }

  return redirect(projectRoot)
}, 1000)