Fully implemented the register flow

src/pages/api/register.ts

@@ -0,0 +1,48 @@
+import {NextApiRequest, NextApiResponse} from "next";
+import {createUserWithEmailAndPassword, getAuth} from "firebase/auth";
+import {app} from "@/firebase";
+import {sessionOptions} from "@/lib/session";
+import {withIronSessionApiRoute} from "iron-session/next";
+import {getFirestore, getDoc, doc, setDoc} from "firebase/firestore";
+
+const auth = getAuth(app);
+const db = getFirestore(app);
+
+export default withIronSessionApiRoute(login, sessionOptions);
+
+const DEFAULT_DESIRED_LEVELS = {
+	reading: 9,
+	listening: 9,
+	writing: 9,
+	speaking: 9,
+};
+
+const DEFAULT_LEVELS = {
+	reading: 0,
+	listening: 0,
+	writing: 0,
+	speaking: 0,
+};
+
+async function login(req: NextApiRequest, res: NextApiResponse) {
+	const {email, password} = req.body as {email: string; password: string};
+
+	createUserWithEmailAndPassword(auth, email, password)
+		.then(async (userCredentials) => {
+			const userId = userCredentials.user.uid;
+			delete req.body.password;
+
+			const user = {...req.body, desiredLevels: DEFAULT_DESIRED_LEVELS, levels: DEFAULT_LEVELS, bio: "", isFirstLogin: true};
+
+			await setDoc(doc(db, "users", userId), user);
+
+			req.session.user = {...user, id: userId};
+			await req.session.save();
+
+			res.status(200).json({user: {...user, id: userId}});
+		})
+		.catch((error) => {
+			console.log(error);
+			res.status(401).json({error});
+		});
+}