Cloudflare Turnstile en login y registro (Next.js)

- lib/turnstile.ts: verifyTurnstile(token, ip) contra siteverify (fail-closed).
- components/Turnstile.tsx: widget cliente (carga el script de Cloudflare, callback
  con el token). Site key por NEXT_PUBLIC_TURNSTILE_SITE_KEY; secreto server-only.
- LoginForm/RegisterForm: widget + token en el POST; submit deshabilitado hasta
  resolver el captcha (si hay site key).
- Routes login/register: verifican el token antes de continuar (error captchaFailed).
- Catálogos: captchaFailed.

Verificado: POST sin token -> captchaFailed en login y registro (enforcement server).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-next/app/[locale]/login/LoginForm.tsx

@@ -3,8 +3,10 @@
 import { useState } from 'react'
 import { useTranslations } from 'next-intl'
 import { useRouter } from '@/i18n/navigation'
+import { Turnstile } from '@/components/Turnstile'
 
-const ERROR_KEYS = ['invalidCredentials', 'missingFields', 'invalidRequest'] as const
+const ERROR_KEYS = ['invalidCredentials', 'missingFields', 'invalidRequest', 'captchaFailed'] as const
+const SITE_KEY = process.env.NEXT_PUBLIC_TURNSTILE_SITE_KEY
 
 export function LoginForm() {
   const t = useTranslations('Login')
@@ -13,6 +15,7 @@ export function LoginForm() {
   const [password, setPassword] = useState('')
   const [showPw, setShowPw] = useState(false)
   const [busy, setBusy] = useState(false)
+  const [captcha, setCaptcha] = useState('')
   const [message, setMessage] = useState<{ ok: boolean; text: string } | null>(null)
 
   async function handleSubmit(e: React.FormEvent) {
@@ -29,7 +32,7 @@ export function LoginForm() {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         credentials: 'same-origin',
-        body: JSON.stringify({ email: email.trim(), password }),
+        body: JSON.stringify({ email: email.trim(), password, turnstileToken: captcha }),
       })
       const data: { success?: boolean; needsSelection?: boolean; error?: string } = await res.json()
       if (data.success) {
@@ -77,9 +80,10 @@ export function LoginForm() {
             {showPw ? '🙈' : '👁'}
           </button>
         </div>
+        <Turnstile onVerify={setCaptcha} />
         <button
           type="submit"
-          disabled={busy}
+          disabled={busy || (!!SITE_KEY && !captcha)}
           className="w-full rounded bg-amber-600 px-4 py-2 font-semibold text-[#1b120b] disabled:opacity-60"
         >
           {busy ? t('connecting') : t('submit')}

web-next/app/[locale]/register/RegisterForm.tsx

@@ -2,6 +2,7 @@
 
 import { useState } from 'react'
 import { useTranslations } from 'next-intl'
+import { Turnstile } from '@/components/Turnstile'
 
 const ERROR_KEYS = [
   'missingFields',
@@ -10,13 +11,16 @@ const ERROR_KEYS = [
   'invalidEmail',
   'emailExists',
   'recruiterNotFound',
+  'captchaFailed',
 ] as const
+const SITE_KEY = process.env.NEXT_PUBLIC_TURNSTILE_SITE_KEY
 
 export function RegisterForm() {
   const t = useTranslations('Register')
   const [form, setForm] = useState({ password: '', confPassword: '', email: '', confEmail: '', recruiter: '' })
   const [accepted, setAccepted] = useState(false)
   const [busy, setBusy] = useState(false)
+  const [captcha, setCaptcha] = useState('')
   const [message, setMessage] = useState<{ ok: boolean; text: string } | null>(null)
 
   function upd(k: string, v: string) {
@@ -33,7 +37,7 @@ export function RegisterForm() {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         credentials: 'same-origin',
-        body: JSON.stringify(form),
+        body: JSON.stringify({ ...form, turnstileToken: captcha }),
       })
       const data: { success?: boolean; error?: string } = await res.json()
       if (data.success) {
@@ -64,7 +68,8 @@ export function RegisterForm() {
           <input type="checkbox" checked={accepted} onChange={(e) => setAccepted(e.target.checked)} className="mt-1" />
           <span>{t('terms')}</span>
         </label>
-        <button type="submit" disabled={busy || !accepted} className="w-full rounded bg-amber-600 px-4 py-2 font-semibold text-[#1b120b] disabled:opacity-60">
+        <Turnstile onVerify={setCaptcha} />
+        <button type="submit" disabled={busy || !accepted || (!!SITE_KEY && !captcha)} className="w-full rounded bg-amber-600 px-4 py-2 font-semibold text-[#1b120b] disabled:opacity-60">
           {busy ? t('creating') : t('submit')}
         </button>
       </form>

web-next/app/api/auth/login/route.ts

@@ -1,18 +1,26 @@
 import { authenticate, getGameAccounts } from '@/lib/auth'
 import { getSession } from '@/lib/session'
 import { setGameAccountSession } from '@/lib/account-session'
+import { verifyTurnstile } from '@/lib/turnstile'
 
 export async function POST(request: Request) {
   let email = ''
   let password = ''
+  let turnstileToken = ''
   try {
     const body = await request.json()
     email = String(body.email ?? '').trim()
     password = String(body.password ?? '')
+    turnstileToken = String(body.turnstileToken ?? '')
   } catch {
     return Response.json({ success: false, error: 'invalidRequest' }, { status: 400 })
   }
 
+  const ip = (request.headers.get('x-forwarded-for') || '').split(',')[0].trim()
+  if (!(await verifyTurnstile(turnstileToken, ip))) {
+    return Response.json({ success: false, error: 'captchaFailed' })
+  }
+
   if (!email || !password) {
     return Response.json({ success: false, error: 'missingFields' })
   }

web-next/app/api/auth/register/route.ts

@@ -1,4 +1,5 @@
 import { registerAccount } from '@/lib/register'
+import { verifyTurnstile } from '@/lib/turnstile'
 
 export async function POST(request: Request) {
   let body: Record<string, string>
@@ -7,6 +8,12 @@ export async function POST(request: Request) {
   } catch {
     return Response.json({ success: false, error: 'invalidRequest' }, { status: 400 })
   }
+
+  const ip = (request.headers.get('x-forwarded-for') || '').split(',')[0].trim()
+  if (!(await verifyTurnstile(body.turnstileToken ?? '', ip))) {
+    return Response.json({ success: false, error: 'captchaFailed' })
+  }
+
   const result = await registerAccount({
     password: body.password ?? '',
     confPassword: body.confPassword ?? '',