src/routes/login/+page.server.ts

import { redirect } from "@sveltejs/kit";
import { getOIDCAuthorizationUrl, getRedirectURI } from "$lib/server/auth";

export const actions = {
	default: async function ({ url, locals }) {
		// TODO: Handle errors if provider is not responding
		const authorizationUrl = await getOIDCAuthorizationUrl(
			{ redirectURI: getRedirectURI(url) },
			{ sessionId: locals.sessionId }
		);

		throw redirect(303, authorizationUrl);
	},
};