docs: add example of next auth v5

docs/pages/examples/index.mdx

@@ -35,6 +35,13 @@ import Example from 'components/Example';
   sourceLink="https://github.com/amannn/next-intl/tree/main/examples/example-app-router-next-auth"
 />
 
+<Example
+  name="App Router Auth.js Beta"
+  hash="app-router-next-auth-v5"
+  description="An example that showcases the usage of next-intl together with Auth.js v5 and the App Router."
+  sourceLink="https://github.com/amannn/next-intl/tree/main/examples/example-app-router-next-auth-v5"
+/>
+
 <Example
   name="App Router Playground"
   hash="app-router-playground"

examples/example-app-router-next-auth-v5/.env.local.example

@@ -0,0 +1 @@
+AUTH_SECRET= # Linux: `openssl rand -hex 32` or go to https://generate-secret.vercel.app/32

examples/example-app-router-next-auth-v5/.gitignore

@@ -0,0 +1,20 @@
+.DS_Store
+
+node_modules/
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.yarn-integrity
+.npm
+
+.eslintcache
+
+*.tsbuildinfo
+next-env.d.ts
+
+.next
+.vercel
+.env*.local

examples/example-app-router-next-auth-v5/next.config.mjs

@@ -0,0 +1,10 @@
+import createNextIntlPlugin from "next-intl/plugin";
+
+const withNextIntl = createNextIntlPlugin("src/i18n.ts");
+
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  reactStrictMode: true,
+};
+
+export default withNextIntl(nextConfig);

examples/example-app-router-next-auth-v5/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "example-app-router-next-auth-v5",
+  "private": true,
+  "scripts": {
+    "dev": "next",
+    "build": "next build",
+    "start": "next start"
+  },
+  "dependencies": {
+    "next": "latest",
+    "next-auth": "beta",
+    "next-intl": "3.9.1",
+    "react": "18.2.0",
+    "react-dom": "18.2.0"
+  },
+  "devDependencies": {
+    "@types/node": "20.11.21",
+    "@types/react": "18.2.60",
+    "@types/react-dom": "18.2.19",
+    "typescript": "5.3.3"
+  }
+}

examples/example-app-router-next-auth-v5/src/app/[locale]/components/auth-components.tsx

@@ -0,0 +1,19 @@
+"use client";
+
+import { signIn, signOut } from "next-auth/react";
+import { useTranslations } from "next-intl";
+import { FC } from "react";
+
+type SignInProps = {
+  provider?: string;
+};
+
+export const SignIn: FC<SignInProps> = ({ provider }) => {
+  const t = useTranslations("SignIn");
+  return <button onClick={() => signIn(provider)}>{t("label")}</button>;
+};
+
+export const SignOut: FC = () => {
+  const t = useTranslations("SignOut");
+  return <button onClick={() => signOut()}>{t("label")}</button>;
+};

examples/example-app-router-next-auth-v5/src/app/[locale]/components/locale-switch.tsx

@@ -0,0 +1,18 @@
+"use client";
+
+import { locales } from "@/i18n";
+import { Link, usePathname } from "@/navigation";
+import { FC } from "react";
+
+export const LocaleSwitch: FC = () => {
+  const pathname = usePathname();
+  return (
+    <div style={{ display: "flex", gap: 5 }}>
+      {locales.map((locale) => (
+        <Link key={locale} href={pathname} locale={locale}>
+          {locale}
+        </Link>
+      ))}
+    </div>
+  );
+};

examples/example-app-router-next-auth-v5/src/app/[locale]/components/main-navigation.tsx

@@ -0,0 +1,22 @@
+import { useTranslations } from "next-intl";
+import { Link } from "@/navigation";
+import { FC } from "react";
+
+const pages = {
+  "/": "home",
+  "/profile": "profile",
+} as const;
+
+export const MainNavigation: FC = () => {
+  const t = useTranslations("Navigation");
+
+  return (
+    <div style={{ display: "flex", gap: 5 }}>
+      {Object.entries(pages).map(([path, key]) => (
+        <Link key={path} href={path}>
+          {t(key)}
+        </Link>
+      ))}
+    </div>
+  );
+};

examples/example-app-router-next-auth-v5/src/app/[locale]/layout.tsx

@@ -0,0 +1,35 @@
+import { auth } from "@/auth";
+import { PropsWithLocale, getMessages, timeZone } from "@/i18n";
+import { SessionProvider } from "next-auth/react";
+import { NextIntlClientProvider, useMessages } from "next-intl";
+import { LocaleSwitch } from "./components/locale-switch";
+import { MainNavigation } from "./components/main-navigation";
+import { FC, PropsWithChildren } from "react";
+
+type LocaleLayoutProps = PropsWithChildren<PropsWithLocale>;
+
+const LocaleLayout: FC<LocaleLayoutProps> = async ({
+  children,
+  params: { locale },
+}) => {
+  const session = await auth();
+  const messages = await getMessages(locale);
+
+  return (
+    <html lang={locale}>
+      <body>
+        <NextIntlClientProvider messages={messages}>
+          <SessionProvider session={session}>
+            <main>
+              <MainNavigation />
+              <LocaleSwitch />
+              {children}
+            </main>
+          </SessionProvider>
+        </NextIntlClientProvider>
+      </body>
+    </html>
+  );
+};
+
+export default LocaleLayout;

examples/example-app-router-next-auth-v5/src/app/[locale]/login/page.tsx

@@ -0,0 +1,54 @@
+"use client";
+
+import { signIn } from "next-auth/react";
+import { useTranslations } from "next-intl";
+import { useSearchParams } from "next/navigation";
+import { FormEvent, useState } from "react";
+
+export default function Login() {
+  const t = useTranslations("Login");
+  const searchParams = useSearchParams();
+  const [error, setError] = useState<string>();
+
+  const onSubmit = async (event: FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+    if (error) setError(undefined);
+
+    const formData = new FormData(event.currentTarget);
+
+    const result = await signIn("credentials", {
+      username: formData.get("username"),
+      password: formData.get("password"),
+      callbackUrl: searchParams.get("callbackUrl") ?? undefined,
+    });
+
+    if (result?.error) setError(result.error);
+  };
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      style={{
+        display: "flex",
+        flexDirection: "column",
+        gap: 10,
+        width: 300,
+      }}
+    >
+      <label style={{ display: "flex" }}>
+        <span style={{ display: "inline-block", flexGrow: 1, minWidth: 100 }}>
+          {t("username")}
+        </span>
+        <input name="username" type="text" />
+      </label>
+      <label style={{ display: "flex" }}>
+        <span style={{ display: "inline-block", flexGrow: 1, minWidth: 100 }}>
+          {t("password")}
+        </span>
+        <input name="password" type="password" />
+      </label>
+      {error && <p>{t("error", { error })}</p>}
+      <button type="submit">{t("submit")}</button>
+    </form>
+  );
+}

examples/example-app-router-next-auth-v5/src/app/[locale]/page.tsx

@@ -0,0 +1,11 @@
+import { auth } from "@/auth";
+import { SignIn, SignOut } from "./components/auth-components";
+import { FC } from "react";
+
+const IndexPage: FC = async () => {
+  const session = await auth();
+
+  return <div>{session ? <SignOut /> : <SignIn />}</div>;
+};
+
+export default IndexPage;

examples/example-app-router-next-auth-v5/src/app/[locale]/profile/page.tsx

@@ -0,0 +1,10 @@
+import { auth } from "@/auth";
+import { FC } from "react";
+
+const ProfilePage: FC = async () => {
+  const session = await auth();
+
+  return <pre>{JSON.stringify(session, null, 2)}</pre>;
+};
+
+export default ProfilePage;

examples/example-app-router-next-auth-v5/src/app/api/auth/[...nextauth]/route.ts

@@ -0,0 +1,3 @@
+export { GET, POST } from "@/auth";
+
+export const runtime = "edge";

examples/example-app-router-next-auth-v5/src/app/layout.tsx

@@ -0,0 +1,7 @@
+import { FC, PropsWithChildren } from "react";
+
+type RootLayoutProps = PropsWithChildren;
+
+const RootLayout: FC<RootLayoutProps> = ({ children }) => <>{children}</>;
+
+export default RootLayout;

examples/example-app-router-next-auth-v5/src/auth.ts

@@ -0,0 +1,73 @@
+import NextAuth from "next-auth";
+import CredentialsProvider from "next-auth/providers/credentials";
+import { NextResponse } from "next/server";
+import { locales } from "./i18n";
+
+const publicPagesPathnameRegex = RegExp(
+  `^(/(${locales.join("|")}))?(${["/", "/login"]
+    .flatMap((p) => (p === "/" ? ["", "/"] : p))
+    .join("|")})/?$`,
+  "i"
+);
+
+const authPagesPathnameRegex = RegExp(
+  `^(/(${locales.join("|")}))?(${["/login"]
+    .flatMap((p) => (p === "/" ? ["", "/"] : p))
+    .join("|")})/?$`,
+  "i"
+);
+
+export const {
+  handlers: { GET, POST },
+  auth,
+  signIn,
+  signOut,
+} = NextAuth({
+  providers: [
+    CredentialsProvider({
+      name: "Credentials",
+      credentials: {
+        username: { type: "text" },
+        password: { type: "password" },
+      },
+      authorize(credentials) {
+        if (
+          credentials?.username === "admin" &&
+          credentials?.password === "admin"
+        ) {
+          return { id: "1", name: "admin" };
+        }
+
+        return null;
+      },
+    }),
+  ],
+  callbacks: {
+    authorized: ({
+      auth,
+      request: {
+        nextUrl: { pathname, origin, basePath, searchParams, href },
+      },
+    }) => {
+      const signInUrl = new URL("/login", origin);
+      signInUrl.searchParams.append("callbackUrl", href);
+
+      const isAuthenticated = !!auth;
+      const isPublicPage = publicPagesPathnameRegex.test(pathname);
+      const isAuthPage = authPagesPathnameRegex.test(pathname);
+
+      if (!(isAuthenticated || isPublicPage))
+        return NextResponse.redirect(signInUrl);
+
+      if (isAuthenticated && isAuthPage)
+        return NextResponse.redirect(
+          new URL(searchParams.get("callbackUrl") ?? new URL(origin), origin)
+        );
+
+      return isAuthenticated || isPublicPage;
+    },
+  },
+  pages: {
+    signIn: "/login",
+  },
+});

examples/example-app-router-next-auth-v5/src/i18n.ts

@@ -0,0 +1,20 @@
+import messages from "@/messages/fr.json";
+import { getRequestConfig } from "next-intl/server";
+
+export const locales = ["fr", "en"] as const;
+export const defaultLocale = locales[0];
+export const timeZone = "Europe/Paris";
+
+export type PropsWithLocale<T = unknown> = T & { params: { locale: string } };
+export type Messages = typeof messages;
+declare global {
+  interface IntlMessages extends Messages {}
+}
+
+export const getMessages = async (locale: string): Promise<Messages> =>
+  (await import(`@/messages/${locale}.json`)).default;
+
+export default getRequestConfig(async ({ locale }) => ({
+  timeZone,
+  messages: await getMessages(locale),
+}));

examples/example-app-router-next-auth-v5/src/messages/en.json

@@ -0,0 +1,19 @@
+{
+  "Navigation": {
+    "home": "Home",
+    "profile": "Profile"
+  },
+  "SignIn": {
+    "label": "Sign In"
+  },
+  "SignOut": {
+    "label": "Sign Out"
+  },
+  "Login": {
+    "title": "Login",
+    "username": "Username",
+    "password": "Password",
+    "submit": "Login",
+    "error": "{error, select, CredentialsSignin {Invalid username or password} other {Unknown error}}"
+  }
+}

examples/example-app-router-next-auth-v5/src/messages/fr.json

@@ -0,0 +1,19 @@
+{
+  "Navigation": {
+    "home": "Acceuil",
+    "profile": "Profile"
+  },
+  "SignIn": {
+    "label": "Se connecter"
+  },
+  "SignOut": {
+    "label": "Se déconnecter"
+  },
+  "Login": {
+    "title": "Connexion",
+    "username": "Nom d'utilisateur",
+    "password": "Mot de passe",
+    "submit": "Connexion",
+    "error": "{error, select, CredentialsSignin {Nom d'utilisateur ou mot de passe incorrect} other {Erreur inconnue}}"
+  }
+}