feat(auth): permite bloquear novos cadastros

.env.example

@@ -17,6 +17,8 @@ POSTGRES_DB=openmonetis_db
 # Gere com: openssl rand -base64 32
 BETTER_AUTH_SECRET=your-secret-key-here-change-this
 BETTER_AUTH_URL=http://localhost:3000
+# Defina como true para bloquear novos cadastros
+DISABLE_SIGNUP=false
 
 # === Portas ===
 APP_PORT=3000

src/app/(auth)/login/page.tsx

@@ -1,5 +1,6 @@
 import { LoginForm } from "@/features/auth/components/login-form";
+import { isSignupDisabled } from "@/shared/lib/auth/signup";
 
 export default function LoginPage() {
-	return <LoginForm />;
+	return <LoginForm signupDisabled={isSignupDisabled()} />;
 }

src/app/(auth)/signup/page.tsx

@@ -1,5 +1,11 @@
+import { redirect } from "next/navigation";
 import { SignupForm } from "@/features/auth/components/signup-form";
+import { isSignupDisabled } from "@/shared/lib/auth/signup";
 
 export default function SignupPage() {
+	if (isSignupDisabled()) {
+		redirect("/login");
+	}
+
 	return <SignupForm />;
 }

src/app/(landing-page)/page.tsx

@@ -30,6 +30,7 @@ import { Badge } from "@/shared/components/ui/badge";
 import { Button } from "@/shared/components/ui/button";
 import { Card, CardContent } from "@/shared/components/ui/card";
 import { getOptionalUserSession } from "@/shared/lib/auth/server";
+import { isSignupDisabled } from "@/shared/lib/auth/signup";
 
 export default async function Page() {
 	const [session, headersList, githubStats] = await Promise.all([
@@ -43,6 +44,7 @@ export default async function Page() {
 		"",
 	).replace(/:\d+$/, "");
 	const isPublicDomain = !!(publicDomain && hostname === publicDomain);
+	const signupDisabled = isSignupDisabled();
 	const metricsItems = getMetricsItems(githubStats.stars, githubStats.forks);
 
 	return (
@@ -86,6 +88,7 @@ export default async function Page() {
 										Entrar
 									</Button>
 								</Link>
+								{!signupDisabled && (
 									<Link href="/signup">
 										<Button
 											variant="ghost"
@@ -95,11 +98,13 @@ export default async function Page() {
 											Começar
 										</Button>
 									</Link>
+								)}
 							</div>
 						))}
 					<MobileNav
 						isPublicDomain={isPublicDomain}
 						isLoggedIn={!!session?.user}
+						signupDisabled={signupDisabled}
 					/>
 				</nav>
 			</NavbarShell>

src/features/auth/components/login-form.tsx

@@ -21,10 +21,18 @@ import { GoogleAuthButton } from "./google-auth-button";
 
 type DivProps = React.ComponentProps<"div">;
 
+interface LoginFormProps extends DivProps {
+	signupDisabled?: boolean;
+}
+
 const authLinkClassName =
 	"font-medium text-foreground/88 underline decoration-border underline-offset-4 transition-colors hover:text-foreground hover:decoration-foreground/30 focus-visible:rounded-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring/40";
 
-export function LoginForm({ className, ...props }: DivProps) {
+export function LoginForm({
+	className,
+	signupDisabled = false,
+	...props
+}: LoginFormProps) {
 	const router = useRouter();
 	const isGoogleAvailable = googleSignInAvailable;
 
@@ -233,12 +241,14 @@ export function LoginForm({ className, ...props }: DivProps) {
 							</div>
 						</Field>
 
+						{!signupDisabled && (
 							<FieldDescription className="pt-1 text-center">
 								Não tem uma conta?{" "}
 								<a href="/signup" className={authLinkClassName}>
 									Inscreva-se
 								</a>
 							</FieldDescription>
+						)}
 
 						<FieldDescription className="text-center text-sm text-muted-foreground">
 							<a href="/" className={authLinkClassName}>

src/features/landing/components/mobile-nav.tsx

@@ -23,9 +23,14 @@ const navLinks = [
 interface MobileNavProps {
 	isPublicDomain: boolean;
 	isLoggedIn: boolean;
+	signupDisabled: boolean;
 }
 
-export function MobileNav({ isPublicDomain, isLoggedIn }: MobileNavProps) {
+export function MobileNav({
+	isPublicDomain,
+	isLoggedIn,
+	signupDisabled,
+}: MobileNavProps) {
 	const [open, setOpen] = useState(false);
 
 	return (
@@ -75,12 +80,14 @@ export function MobileNav({ isPublicDomain, isLoggedIn }: MobileNavProps) {
 											Entrar
 										</Button>
 									</Link>
+									{!signupDisabled && (
 										<Link href="/signup" onClick={() => setOpen(false)}>
 											<Button className="w-full gap-2">
 												Começar
 												<RiArrowRightSLine size={16} />
 											</Button>
 										</Link>
+									)}
 								</>
 							)}
 						</div>

src/proxy.ts

@@ -1,5 +1,6 @@
 import { type NextRequest, NextResponse } from "next/server";
 import { auth } from "@/shared/lib/auth/config";
+import { isSignupDisabled } from "@/shared/lib/auth/signup";
 
 // Rotas protegidas que requerem autenticação
 const PROTECTED_ROUTES = [
@@ -85,6 +86,22 @@ export default async function proxy(request: NextRequest) {
 	});
 
 	const isAuthenticated = !!session?.user;
+	const signupDisabled = isSignupDisabled();
+
+	if (signupDisabled) {
+		if (pathname === "/signup" || pathname.startsWith("/signup/")) {
+			return NextResponse.redirect(
+				new URL(isAuthenticated ? "/dashboard" : "/login", request.url),
+			);
+		}
+
+		if (pathname.startsWith("/api/auth/sign-up")) {
+			return NextResponse.json(
+				{ error: "Novos cadastros estão desativados." },
+				{ status: 403 },
+			);
+		}
+	}
 
 	// Redirect authenticated users away from login/signup pages
 	if (isAuthenticated && PUBLIC_AUTH_ROUTES.includes(pathname)) {

src/shared/lib/auth/config.ts

@@ -1,7 +1,8 @@
 import { passkey } from "@better-auth/passkey";
-import { betterAuth } from "better-auth";
+import { APIError, betterAuth } from "better-auth";
 import { drizzleAdapter } from "better-auth/adapters/drizzle";
 import type { GoogleProfile } from "better-auth/social-providers";
+import { isSignupDisabled } from "@/shared/lib/auth/signup";
 import { seedDefaultCategoriesForUser } from "@/shared/lib/categories/defaults";
 import { db, schema } from "@/shared/lib/db";
 import { ensureDefaultPayerForUser } from "@/shared/lib/payers/defaults";
@@ -122,6 +123,13 @@ export const auth = betterAuth({
 	databaseHooks: {
 		user: {
 			create: {
+				before: async () => {
+					if (!isSignupDisabled()) return;
+
+					throw new APIError("FORBIDDEN", {
+						message: "Novos cadastros estão desativados.",
+					});
+				},
 				/**
 				 * Após criar novo usuário, inicializa:
 				 * 1. Categorias padrão (Receitas/Despesas)

src/shared/lib/auth/signup.ts

@@ -0,0 +1,4 @@
+export function isSignupDisabled(): boolean {
+	const value = process.env.DISABLE_SIGNUP?.trim().toLowerCase();
+	return value === "true";
+}