my-links/pages/api/auth/[...nextauth].ts

import { PrismaClient } from "@prisma/client";
import NextAuth from "next-auth";
import GoogleProvider from "next-auth/providers/google";
const prisma = new PrismaClient();

export default NextAuth({
	providers: [
		GoogleProvider({
			clientId: process.env.GOOGLE_CLIENT_ID,
			clientSecret: process.env.GOOGLE_CLIENT_SECRET,
			authorization: {
				params: {
					prompt: "consent",
					access_type: "offline",
					response_type: "code",
				},
			},
		}),
	],
	callbacks: {
		async signIn({ account: accountParam, profile }) {
			// TODO: Auth
			console.log(
				"Connexion via",
				accountParam.provider,
				accountParam.providerAccountId,
				profile.email,
				profile.name
			);
			if (accountParam.provider !== "google") {
				return (
					"/signin?error=" +
					encodeURI("Authentitifcation via Google requise")
				);
			}
			const email = profile?.email;
			if (email === "") {
				return (
					"/signin?error=" +
					encodeURI(
						"Impossible de récupérer l'email associé à ce compte Google"
					)
				);
			}
			const googleId = profile?.sub;
			if (googleId === "") {
				return (
					"/signin?error=" +
					encodeURI(
						"Impossible de récupérer l'identifiant associé à ce compte Google"
					)
				);
			}
			try {
				const account = await prisma.user.findFirst({
					where: {
						google_id: googleId,
						email,
					},
				});
				const accountCount = await prisma.user.count();
				if (!account) {
					if (accountCount === 0) {
						await prisma.user.create({
							data: {
								email,
								google_id: googleId,
							},
						});
						return true;
					}
					return (
						"/signin?error=" +
						encodeURI(
							"Vous n'êtes pas autorisé à vous connecter avec ce compte Google"
						)
					);
				} else {
					return true;
				}
			} catch (error) {
				console.error(error);
				return (
					"/signin?error=" +
					encodeURI(
						"Une erreur est survenue lors de l'authentification"
					)
				);
			}
		},
	},
	pages: {
		signIn: "/signin",
		error: "/signin",
	},
	session: {
		maxAge: 60 * 60 * 6, // Session de 6 heures
	},
});