| 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(); | |
| } | |