src/routes/api/oauth/refresh/+server.ts


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import { dev } from '$app/environment';
import { env } from '$env/dynamic/private';
import { env as env2 } from '$env/dynamic/public';

export const GET = async ({ url, cookies }) => {
	const formData = new FormData();

	formData.append('grant_type', 'refresh_token');
	formData.append('client_id', env2.PUBLIC_ANILIST_CLIENT_ID as string);
	formData.append('client_secret', env.ANILIST_CLIENT_SECRET as string);
	formData.append('refresh_token', url.searchParams.get('token') || '');

	const newUser = await (
		await fetch('https://anilist.co/api/v2/oauth/token', {
			method: 'POST',
			body: formData
		})
	).json();

	cookies.set('user', JSON.stringify(newUser), {
		path: '/',
		maxAge: 60 * 60 * 24 * 7,
		httpOnly: true,
		sameSite: 'lax',
		secure: !dev
	});

	return Response.json(newUser);
};