Implemented a simple authentication scheme with Firebase and Iron Session

src/hooks/useUser.tsx

@@ -0,0 +1,29 @@
+import {useEffect} from "react";
+import Router from "next/router";
+import useSWR from "swr";
+import {User} from "@/interfaces/user";
+import axios from "axios";
+
+const fetcher = (url: string) => axios.get(url).then((res) => res.data);
+
+export default function useUser({redirectTo = "", redirectIfFound = false} = {}) {
+	const {data: user, mutate: mutateUser, isLoading} = useSWR<User>("/api/user", fetcher);
+
+	useEffect(() => {
+		// if no redirect needed, just return (example: already on /dashboard)
+		// if user data not yet there (fetch in progress, logged in or not) then don't do anything yet
+		console.log(redirectTo, user);
+		if (!redirectTo || !user) return;
+
+		if (
+			// If redirectTo is set, redirect if the user was not found.
+			(redirectTo && !redirectIfFound && !user) ||
+			// If redirectIfFound is also set, redirect if the user was found
+			(redirectIfFound && user)
+		) {
+			Router.push(redirectTo);
+		}
+	}, [user, redirectIfFound, redirectTo]);
+
+	return {user, mutateUser, isLoading};
+}