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fix(api): detect crawlers and redirect browsers to SPA

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Browsers get 302 redirect to / where the SPA handles routing client-side with the original /a/{naddr} URL preserved. Crawlers/bots get the full HTML with OG meta tags.
This commit is contained in:
Gigi
2025-10-16 14:43:29 +02:00
parent 99bfe209a5
commit 4cc32c27de
1 changed files with 20 additions and 2 deletions
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22
api/article-og.ts
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@@ -159,7 +159,6 @@ function generateHtml(naddr: string, meta: ArticleMetadata | null): string {
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="refresh" content="0; url=/" />
<link rel="icon" type="image/x-icon" href="/favicon.ico" />
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png" />
@@ -196,6 +195,16 @@ function generateHtml(naddr: string, meta: ArticleMetadata | null): string {
</html>`
}
function isCrawler(userAgent: string | undefined): boolean {
if (!userAgent) return false
const crawlers = [
'bot', 'crawl', 'spider', 'slurp', 'facebook', 'twitter', 'linkedin',
'whatsapp', 'telegram', 'slack', 'discord', 'preview'
]
const ua = userAgent.toLowerCase()
return crawlers.some(crawler => ua.includes(crawler))
}
export default async function handler(req: VercelRequest, res: VercelResponse) {
const naddr = (req.query.naddr as string | undefined)?.trim()
@@ -203,7 +212,16 @@ export default async function handler(req: VercelRequest, res: VercelResponse) {
return res.status(400).json({ error: 'Missing naddr parameter' })
}
// Check cache
const userAgent = req.headers['user-agent'] as string | undefined
// If it's a regular browser (not a bot), redirect to index.html
// and let the SPA handle routing client-side
if (!isCrawler(userAgent)) {
res.setHeader('Location', '/')
return res.status(302).send('')
}
// Check cache for bots/crawlers
const now = Date.now()
const cached = memoryCache.get(naddr)
if (cached && cached.expires > now) {