chore: migrate to payload / nextjs

src/app/(frontend)/(sitemaps)/pages-sitemap.xml/route.ts

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+import { getServerSideSitemap } from 'next-sitemap'
+import { getPayload } from 'payload'
+import config from '@payload-config'
+import { unstable_cache } from 'next/cache'
+
+const getPagesSitemap = unstable_cache(
+  async () => {
+    const payload = await getPayload({ config })
+    const SITE_URL =
+      process.env.NEXT_PUBLIC_SERVER_URL ||
+      process.env.VERCEL_PROJECT_PRODUCTION_URL ||
+      'https://example.com'
+
+    const results = await payload.find({
+      collection: 'pages',
+      overrideAccess: false,
+      draft: false,
+      depth: 0,
+      limit: 1000,
+      pagination: false,
+      where: {
+        _status: {
+          equals: 'published',
+        },
+      },
+      select: {
+        slug: true,
+        updatedAt: true,
+      },
+    })
+
+    const dateFallback = new Date().toISOString()
+
+    const defaultSitemap = [
+      {
+        loc: `${SITE_URL}/search`,
+        lastmod: dateFallback,
+      },
+      {
+        loc: `${SITE_URL}/posts`,
+        lastmod: dateFallback,
+      },
+    ]
+
+    const sitemap = results.docs
+      ? results.docs
+          .filter((page) => Boolean(page?.slug))
+          .map((page) => {
+            return {
+              loc: page?.slug === 'home' ? `${SITE_URL}/` : `${SITE_URL}/${page?.slug}`,
+              lastmod: page.updatedAt || dateFallback,
+            }
+          })
+      : []
+
+    return [...defaultSitemap, ...sitemap]
+  },
+  ['pages-sitemap'],
+  {
+    tags: ['pages-sitemap'],
+  },
+)
+
+export async function GET() {
+  const sitemap = await getPagesSitemap()
+
+  return getServerSideSitemap(sitemap)
+}

src/app/(frontend)/(sitemaps)/posts-sitemap.xml/route.ts

@@ -0,0 +1,55 @@
+import { getServerSideSitemap } from 'next-sitemap'
+import { getPayload } from 'payload'
+import config from '@payload-config'
+import { unstable_cache } from 'next/cache'
+
+const getPostsSitemap = unstable_cache(
+  async () => {
+    const payload = await getPayload({ config })
+    const SITE_URL =
+      process.env.NEXT_PUBLIC_SERVER_URL ||
+      process.env.VERCEL_PROJECT_PRODUCTION_URL ||
+      'https://example.com'
+
+    const results = await payload.find({
+      collection: 'posts',
+      overrideAccess: false,
+      draft: false,
+      depth: 0,
+      limit: 1000,
+      pagination: false,
+      where: {
+        _status: {
+          equals: 'published',
+        },
+      },
+      select: {
+        slug: true,
+        updatedAt: true,
+      },
+    })
+
+    const dateFallback = new Date().toISOString()
+
+    const sitemap = results.docs
+      ? results.docs
+          .filter((post) => Boolean(post?.slug))
+          .map((post) => ({
+            loc: `${SITE_URL}/posts/${post?.slug}`,
+            lastmod: post.updatedAt || dateFallback,
+          }))
+      : []
+
+    return sitemap
+  },
+  ['posts-sitemap'],
+  {
+    tags: ['posts-sitemap'],
+  },
+)
+
+export async function GET() {
+  const sitemap = await getPostsSitemap()
+
+  return getServerSideSitemap(sitemap)
+}

src/app/(frontend)/[[...slug]]/page.tsx

@@ -0,0 +1,12 @@
+import NextApp from '@/spa/NextApp'
+
+type Args = {
+  params: Promise<{ slug?: string[] }>
+}
+
+export default async function Page({ params }: Args) {
+  const { slug = [] } = await params
+  const pathname = `/${slug.join('/')}`.replace(/\/$/, '') || '/'
+
+  return <NextApp pathname={pathname} />
+}

src/app/(frontend)/globals.css

@@ -0,0 +1,124 @@
+@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;1,100;1,200;1,300;1,400;1,500;1,600;1,700&family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swap');
+@import 'tailwindcss';
+
+@theme {
+  --font-display: "IBM Plex Sans", sans-serif;
+  --font-body: "Inter", sans-serif;
+
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --color-card: var(--card);
+  --color-card-foreground: var(--card-foreground);
+  --color-popover: var(--popover);
+  --color-popover-foreground: var(--popover-foreground);
+  --color-primary: var(--primary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-secondary: var(--secondary);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-muted: var(--muted);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-accent: var(--accent);
+  --color-accent-foreground: var(--accent-foreground);
+  --color-destructive: var(--destructive);
+  --color-border: var(--border);
+  --color-input: var(--input);
+  --color-ring: var(--ring);
+
+  --radius-lg: 0.5rem;
+  --radius-md: calc(0.5rem - 2px);
+  --radius-sm: calc(0.5rem - 4px);
+}
+
+:root {
+  --background: #E4E2E3;
+  --foreground: #020617;
+  --card: #ffffff;
+  --card-foreground: #020617;
+  --popover: #ffffff;
+  --popover-foreground: #020617;
+  --primary: #03093A;
+  --primary-foreground: #ffffff;
+  --secondary: #f8fafc;
+  --secondary-foreground: #03093A;
+  --muted: #f1f5f9;
+  --muted-foreground: #64748b;
+  --accent: #EFBF04;
+  --accent-foreground: #ffffff;
+  --destructive: #ef4444;
+  --border: #e2e8f0;
+  --input: #e2e8f0;
+  --ring: #03093A;
+}
+
+.dark {
+  --background: #020617;
+  --foreground: #f8fafc;
+  --card: #1e293b;
+  --card-foreground: #f8fafc;
+  --popover: #020617;
+  --popover-foreground: #f8fafc;
+  --primary: #03093A;
+  --primary-foreground: #ffffff;
+  --secondary: #1e293b;
+  --secondary-foreground: #f8fafc;
+  --muted: #1e293b;
+  --muted-foreground: #94a3b8;
+  --accent: #EFBF04;
+  --accent-foreground: #ffffff;
+  --destructive: #7f1d1d;
+  --border: rgba(255, 255, 255, 0.1);
+  --input: rgba(255, 255, 255, 0.15);
+  --ring: #94a3b8;
+}
+
+@layer base {
+  * {
+    @apply border-border outline-ring/50;
+  }
+  body {
+    @apply bg-background text-foreground font-body;
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+    margin: 0;
+  }
+
+  ::selection {
+    background: #EFBF04;
+    color: #03093A;
+  }
+  h1, h2, h3, h4, h5, h6 {
+    @apply font-display font-bold;
+  }
+
+  blockquote, q,
+  .quote, [class*="italic"] {
+    font-family: "Inter", sans-serif;
+    font-style: italic;
+  }
+
+  label,
+  .label {
+    font-family: "IBM Plex Sans", sans-serif;
+  }
+
+  input, textarea, select, button {
+    font-family: "Inter", sans-serif;
+  }
+}
+
+@keyframes fade-in {
+  from {
+    opacity: 0;
+    transform: translateY(20px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+@layer utilities {
+  .animate-fade-in {
+    animation: fade-in 0.6s ease-out;
+  }
+}

src/app/(frontend)/layout.tsx

@@ -0,0 +1,21 @@
+import type { Metadata } from 'next'
+import React from 'react'
+
+import './globals.css'
+
+export default function RootLayout({ children }: { children: React.ReactNode }) {
+  return (
+    <html lang="de">
+      <head>
+        <link href="/favicon.ico" rel="icon" sizes="32x32" />
+        <link href="/favicon.svg" rel="icon" type="image/svg+xml" />
+      </head>
+      <body>{children}</body>
+    </html>
+  )
+}
+
+export const metadata: Metadata = {
+  title: 'Bayerischer Mittelstandspreis 2026',
+  description: 'Der Preis des Bayerischen Mittelstands',
+}

src/app/(frontend)/next/exit-preview/route.ts

@@ -0,0 +1,7 @@
+import { draftMode } from 'next/headers'
+
+export async function GET(): Promise<Response> {
+  const draft = await draftMode()
+  draft.disable()
+  return new Response('Draft mode is disabled')
+}

src/app/(frontend)/next/preview/route.ts

@@ -0,0 +1,59 @@
+import type { PayloadRequest } from 'payload'
+import { getPayload } from 'payload'
+
+import { draftMode } from 'next/headers'
+import { redirect } from 'next/navigation'
+import { NextRequest } from 'next/server'
+
+import configPromise from '@payload-config'
+
+export type PreviewSearchParams = {
+  path: string
+  previewSecret: string
+}
+
+export async function GET(req: NextRequest): Promise<Response> {
+  const payload = await getPayload({ config: configPromise })
+
+  const { searchParams } = new URL(req.url)
+
+  const path = searchParams.get('path')
+  const previewSecret = searchParams.get('previewSecret')
+
+  if (previewSecret !== process.env.PREVIEW_SECRET) {
+    return new Response('You are not allowed to preview this page', { status: 403 })
+  }
+
+  if (!path) {
+    return new Response('Insufficient search params', { status: 404 })
+  }
+
+  if (!path.startsWith('/')) {
+    return new Response('This endpoint can only be used for relative previews', { status: 500 })
+  }
+
+  let user
+
+  try {
+    user = await payload.auth({
+      req: req as unknown as PayloadRequest,
+      headers: req.headers,
+    })
+  } catch (error) {
+    payload.logger.error({ err: error }, 'Error verifying token for live preview')
+    return new Response('You are not allowed to preview this page', { status: 403 })
+  }
+
+  const draft = await draftMode()
+
+  if (!user) {
+    draft.disable()
+    return new Response('You are not allowed to preview this page', { status: 403 })
+  }
+
+  // You can add additional checks here to see if the user is allowed to preview this page
+
+  draft.enable()
+
+  redirect(path)
+}

src/app/(frontend)/next/seed/route.ts

@@ -0,0 +1,31 @@
+import { createLocalReq, getPayload } from 'payload'
+import { seed } from '@/endpoints/seed'
+import config from '@payload-config'
+import { headers } from 'next/headers'
+
+export const maxDuration = 60 // This function can run for a maximum of 60 seconds
+
+export async function POST(): Promise<Response> {
+  const payload = await getPayload({ config })
+  const requestHeaders = await headers()
+
+  // Authenticate by passing request headers
+  const { user } = await payload.auth({ headers: requestHeaders })
+
+  if (!user) {
+    return new Response('Action forbidden.', { status: 403 })
+  }
+
+  try {
+    // Create a Payload request object to pass to the Local API for transactions
+    // At this point you should pass in a user, locale, and any other context you need for the Local API
+    const payloadReq = await createLocalReq({ user }, payload)
+
+    await seed({ payload, req: payloadReq })
+
+    return Response.json({ success: true })
+  } catch (e) {
+    payload.logger.error({ err: e, message: 'Error seeding data' })
+    return new Response('Error seeding data.', { status: 500 })
+  }
+}

src/app/(frontend)/not-found.tsx

@@ -0,0 +1,18 @@
+import Link from 'next/link'
+import React from 'react'
+
+import { Button } from '@/components/ui/button'
+
+export default function NotFound() {
+  return (
+    <div className="container py-28">
+      <div className="prose max-w-none">
+        <h1 style={{ marginBottom: 0 }}>404</h1>
+        <p className="mb-4">This page could not be found.</p>
+      </div>
+      <Button asChild variant="default">
+        <Link href="/">Go home</Link>
+      </Button>
+    </div>
+  )
+}