All files / app/api/preview route.ts

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import { draftMode } from 'next/headers'
import { redirect } from 'next/navigation'
 
function getPreviewPath(contentType: string | undefined, slug: string | null, locale: string | null, status: string | null): string {
  const basePath = (() => {
    if (!contentType) return '/';
 
    if (contentType === 'post' || contentType.includes('posts')) {
      return slug ? '/blog/' + slug : '/blog';
    }
 
    Eif (contentType === 'page' || contentType.includes('pages')) {
      return slug ? '/' + slug : '/';
    }
 
    return '/' + contentType;
  })();
 
  const localePath = locale && locale !== 'en' ? '/' + locale + basePath : basePath;
  const statusParam = status ? '?status=' + status : '';
  return localePath + statusParam;
}
 
export const GET = async (request: Request) => {
  // Parse query string parameters
  const { searchParams } = new URL(request.url);
  const secret = searchParams.get('secret');
  const slug = searchParams.get('slug');
  const locale = searchParams.get('locale');
  const uid = searchParams.get('uid');
  const status = searchParams.get('status');
 
  // Check the secret and next parameters
  if (secret !== process.env.PREVIEW_SECRET) {
    return new Response('Invalid token', { status: 401 });
  }
 
  const contentType = uid?.split(".").pop();
  const finalPath = getPreviewPath(contentType, slug, locale, status);
 
  // Enable Draft Mode by setting the cookie
  const draft = await draftMode();
   if (status === 'draft') {
    draft.enable();
  } else {
    draft.disable();
  }
 
  // Redirect to the path from the fetched post
  redirect(finalPath);
};