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import { NextApiRequest, NextApiResponse } from "next";
import { getPostBySlug } from "../../lib/api";
export default async function preview(
req: NextApiRequest,
res: NextApiResponse,
) {
// Check the secret and next parameters
// This secret should only be known to this API route and the CMS
if (
req.query.secret !== process.env.KONTENT_PREVIEW_SECRET ||
!req.query.slug
) {
return res
.status(401)
.json({ message: "Invalid token or slug not specified" });
}
// Fetch the headless CMS to check if the provided `slug` exists
const post = await getPostBySlug(req.query.slug as string, true);
// If the slug doesn't exist prevent preview mode from being enabled
if (!post) {
return res.status(401).json({ message: "Invalid slug" });
}
// Enable Preview Mode by setting the cookie
res.setDraftMode({ enable: true });
// Redirect to the path from the fetched post
// We don't redirect to req.query.slug as that might lead to open redirect vulnerabilities
res.writeHead(307, { Location: `/posts/${post.slug}` });
res.end();
}
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