N
Nuxt•2d ago
Solid

Way to pass data between route middleware and page

I am trying to make a authentication middleware and because I am looking for something very specific I cannot resort to already made tools. The basic gist of it, like many auth middlewares, is to route to a 'login' page if the user has no permission and route to the right page if the user does have permission. I managed to get this far, but the issue now comes when I want to add content to this page that also varies depending on the user (some users have permission to see certain things). My thought was that I could pass this 'session' to the page from the middleware. I have tried things like setting context, meta and also useState. None of them seem to work. It is required that the user MUST NOT get to edit and SHOULD NOT see the data that is passed from the middleware to the page At this point I don't even know if it is possible. The documentation on middleware isn't incredibly extensive and not many people have made tutorials on it. My own attempts have not yet gotten me any further. I am asking as a last resort before rethinking my website architecture
2 Replies
kapa.ai
kapa.ai•2d ago
Hi @Solid. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- Based on the knowledge sources provided, there isn't a direct method to securely pass data from route middleware to a page in Nuxt 3 in the way you're describing. However, I can suggest some alternative approaches that might help you achieve your goal: 1. Use a store: Instead of trying to pass data directly from middleware to a page, you could use a store (like Pinia) to manage your authentication state and user permissions. The middleware can update the store, and the page can read from it. 2. Server-side data fetching: You could perform the permission check and data fetching on the server side. This way, you ensure that the client only receives the data they're allowed to see. 3. API route protection: Instead of relying solely on client-side middleware, you can protect your API routes on the server side. This ensures that even if a user somehow bypasses the client-side checks, they still can't access unauthorized data. Here's an example of how you might structure your middleware and page: 
// middleware/auth.ts
export default defineNuxtRouteMiddleware(async (to, from) => {
  const userStore = useUserStore();

  if (!userStore.authenticated) {
    return navigateTo('/login');
  }

  // Instead of trying to pass data to the page, update the store
  await userStore.fetchUserPermissions();
})

// pages/protected.vue
<script setup>
definePageMeta({ middleware: ["auth"] });

const userStore = useUserStore();
const { data } = await useFetch('/api/protected-data');
</script>

<template>
  <div>
    <h1>Protected Page</h1>
    <div v-if="userStore.hasPermission('view-sensitive-data')">
      {{ data }}
    </div>
  </div>
</template>
// middleware/auth.ts
export default defineNuxtRouteMiddleware(async (to, from) => {
  const userStore = useUserStore();

  if (!userStore.authenticated) {
    return navigateTo('/login');
  }

  // Instead of trying to pass data to the page, update the store
  await userStore.fetchUserPermissions();
})

// pages/protected.vue
<script setup>
definePageMeta({ middleware: ["auth"] });

const userStore = useUserStore();
const { data } = await useFetch('/api/protected-data');
</script>

<template>
  <div>
    <h1>Protected Page</h1>
    <div v-if="userStore.hasPermission('view-sensitive-data')">
      {{ data }}
    </div>
  </div>
</template>
In this setup, the middleware checks authentication and updates a store with user permissions. The page then uses this store to determine what to display, and fetches data from an API route that can implement its own server-side checks. For more information on middleware in Nuxt 3, you can refer to the Nuxt 3 Middleware documentation. Remember, for truly sensitive data, always implement server-side checks and don't rely solely on client-side logic for security. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------
kapa.ai
kapa.ai•2d ago
<@251792143608184832> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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