@lucia-auth/sveltekit/client/index.js

SvelteKit integration for Lucia

import { get, derived } from "svelte/store";
import { onDestroy, setContext } from "svelte";
import { getContext } from "svelte";
export const getUser = () => {
    const luciaContext = getContext("__lucia__");
    if (!luciaContext)
        throw new UndefinedError("__lucia__");
    return luciaContext;
};
const generateId = () => {
    const generateRandomNumber = () => {
        const randomNumber = Math.random();
        if (randomNumber !== 0)
            return randomNumber;
        return generateRandomNumber();
    };
    return generateRandomNumber().toString(36).slice(2, 7);
};
export class UndefinedError extends Error {
    constructor(type) {
        const errorMsg = {
            "pageData._lucia": "page data property _lucia is undefined  - Make sure handleServerSession(auth) is set up inside the root +layout.server.ts",
            __lucia__: "context __lucia__ does not exist in your app - Make sure handleSession() is set inside the root +layout.svelte file"
        };
        super(errorMsg[type]);
    }
}
export const handleSession = (pageStore, onSessionUpdate = () => { }) => {
    const luciaStore = derived(pageStore, (val) => {
        const luciaPageData = val.data._lucia;
        if (luciaPageData === undefined)
            throw new UndefinedError("pageData._lucia");
        return luciaPageData;
    });
    const userStore = derived(luciaStore, (val) => val.user);
    setContext("__lucia__", userStore);
    if (typeof document === "undefined")
        return;
    const broadcastChannel = new BroadcastChannel("__lucia__");
    const tabId = generateId();
    let initialLuciaStoreSubscription = true;
    const luciaStoreUnsubscribe = luciaStore.subscribe((newVal) => {
        /*
        prevent postMessage on store initialization
        */
        if (initialLuciaStoreSubscription)
            return (initialLuciaStoreSubscription = false);
        broadcastChannel.postMessage({
            tabId: tabId,
            sessionChecksum: newVal.sessionChecksum
        });
    });
    broadcastChannel.addEventListener("message", ({ data }) => {
        const messageData = data;
        /*
        check if message is coming from the same tab
        */
        if (messageData.tabId === tabId)
            return;
        const currentLuciaContext = get(luciaStore);
        /*
        check if session has changed from the previous page data
        */
        if (messageData.sessionChecksum === currentLuciaContext.sessionChecksum)
            return;
        onSessionUpdate(!!messageData.sessionChecksum);
    });
    onDestroy(() => {
        broadcastChannel.close();
        luciaStoreUnsubscribe();
    });
};