@animelist/auth-next

Implementation of the @animelist/auth for SvelteKit.

You can checkout this Example.

Table of Contents

1. Setup
2. Get Current User
3. Load user from server
4. License

Setup

In your Sveltekit project install the packages:

npm

npm install @animelist/auth-sveltekit @animelist/client

yarn

yarn add @animelist/auth-sveltekit @animelist/client

pnpm

pnpm install @animelist/auth-sveltekit @animelist/client

1. This package reads environment variables from process.env, which is not available for some targets, for that you need to define them in your vite.config.ts.

You can define them directly, dotenv or any other plugin that do the job.

This is an example on how can be done:

  import { sveltekit } from "@sveltejs/kit/vite";
  import { defineConfig } from "vite";
  import dotenv from "dotenv"; // npm install -D dotenv
  dotenv.config();

  const defineProcessEnv = () => {
    const definedEnvs = Object.fromEntries(
      Object.entries(process.env || {}).map(([key, value]) => [
        `process.env.${key}`,
        JSON.stringify(value),
      ])
    );

    return definedEnvs;
  };

  export default defineConfig({
    plugins: [sveltekit()],
    define: defineProcessEnv(),
  });

You may need to mark @animelist/auth as external to allow vite to replace the values correctly.

   export default defineConfig({
     ssr: {
       noExternal: ["@animelist/auth"]
     },
     // ...
 });

2. You need to provide the following environment variables:

   MAL_CLIENT_ID = <client_id>
   MAL_CLIENT_SECRET = <client_secret>
   MAL_REQUEST_DEBUG = true # optional

   To get the client id and client secret you need to log into your https://myanimelist.net/:

   • Go to Preferences > API and create a new client.
   • On the App Redirect URL use <url>/api/myanimelist/auth/callback.
     • For example http://localhost:3000/api/myanimelist/auth/callback if your app is running on localhost:3000.

   If you used the example vite.config.ts you can just create a .env file and the dotenv will load the variables.

3. Create a hooks.server.ts with the contents:

import type { Handle } from "@sveltejs/kit";
import {
  createMyAnimeListFetchHandler,
  getUser,
} from "@animelist/auth-sveltekit/server";

const handler = createMyAnimeListFetchHandler();

export const handle: Handle = async ({ event, resolve }) => {
  event.locals.session = await getUser(event.cookies);

  if (event.url.pathname.startsWith("/api/myanimelist")) {
    return handler(event.request);
  }

  return resolve(event);
};

Also may need to modify your app.d.ts

import type { Session } from "@animelist/auth-sveltekit/client";

declare global {
  namespace App {
    interface Locals {
      session?: Session | null;
    }
  }
}

4. In your src/routes/+layout.svelte initializes the session

<script lang="ts">
  import { session } from "@animelist/auth-sveltekit/client";
  session.initialize().catch(console.error);
</script>

<slot />

5. You are ready! in a src/routes/+page.svelte you can add this:

<script lang="ts">
  import { signIn, signOut, session } from "@animelist/auth-sveltekit/client";
</script>

{#if $session.loading}
  <p>Loading...</p>
{:else if $session.user == null}
  <button on:click="{signIn}">Sign In</button>
{:else if $session.user}
  <p>Hello {$session.user.name}</p>
  <button on:click="{signOut}">Sign Out</button>
{/if}

6. $session also returns an accessToken that can be used to make requests.

<script lang="ts">
  import { signIn, signOut, session } from "@animelist/auth-sveltekit/client";
  import { MALClient } from "@animelist/client";

$: (async function(){
    if (!$session.accessToken) {
      return;
    }

    // We need the 'proxyUrl' because we are running on the client
    const client = new MALClient({
      proxyUrl: "/api/myanimelist",
      accessToken: $session.accessToken,
    });

    const result = await client.getSuggestedAnime();
    console.log(result);
})()
</script>

Get Current User

After the user is logged you can get the current user information using getServerSession.

Which returns null if the user is not logged or UserSession:

type UserSession = {
  userId: number;
  refreshToken: string;
  accessToken: string;
};

import { getServerSession } from "@animelist/auth-next/server";

const session = await getServerSession(cookies);

if (session) {
  console.log("User is logged in");
}

You can also use getRequiredServerSession(cookies) which throws an error if the user is not logged in.

If you want to get the user information you can use the getUser, keep in mind this fetches the user, instead of just retrieve the information from the cookie.

import { getUser } from "@animelist/auth-next/server";

const user = await getUser(cookies);

if (user) {
  console.log("User is logged in");
}

Load user from server

Each time we load a page session.initialize will fetch the user from the client side, so you may need to show a spinner while the user is loading. To prevent this we can fetch the user from the server side.

Following our setup example, we can add a +layout.server.ts to load the user to all our pages.

import type { LayoutServerLoad } from './$types';

// `hooks.server.ts` already set the session
export const load: LayoutServerLoad = async ({ locals }) => {
  return { session: locals.session };
};

<script lang="ts">
  import { session } from "@animelist/auth-sveltekit/client";
  import type { LayoutServerData } from './$types';

  export let data: LayoutServerData;

  session.initialize(data.session).catch(console.error);
</script>

<slot />

Alternatively you can drop the usage of $session and just access the $page.data.session.

<script lang="ts">
import { page } from '$app/stores';
</script>

<div>{$page.data.session?.user.name}</div>

Remember to also update your app.d.ts for type safety.

// app.d.ts
import type { Session } from '@animelist/auth-sveltekit/client';

declare global {
  namespace App {
    interface Locals {
      session?: Session | null;
    }

    interface PageData {
      session?: Session | null;
    }
    
    // interface Error {}
    // interface Platform {}
  }
}

Good to know

You may also notice you are receiving this warning:

⚠️ 'process.env.MAL_SECRET_KEY' was not set, using a default secret key

To fix that add other environment variable MAL_SECRET_KEY, to generate a secret key you can use:

openssl rand --base64 32

Or this beauty:

echo "console.log(require('crypto').randomBytes(32).toString('base64'))" | node

License

This project is licensed under the MIT License - see the LICENSE file for details.