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python
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bbs
opengraph: cache og images
+15
-14
+15
-14
opengraph/index.ts
+15
-14
opengraph/index.ts
···
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const url = new URL(request.url);
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const path = url.pathname;
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// Dynamic og:image at /og/bbs/...
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// Dynamic og:image at /og/bbs/... — cached at the edge for 1 hour.
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if (path.startsWith("/og/bbs/")) {
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const cache = caches.default;
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const cachedResponse = await cache.match(request);
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if (cachedResponse) return cachedResponse;
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const route = parseRoute(path);
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if (!route) {
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return renderOgImage(DEFAULT_TITLE, "", DEFAULT_DESCRIPTION);
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}
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let imageResponse: Response;
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try {
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const metadata = await fetchMetadata(route);
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if (metadata) {
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return renderOgImage(
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metadata.title,
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metadata.subtitle,
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metadata.description,
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);
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}
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const metadata = route ? await fetchMetadata(route) : null;
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imageResponse = metadata
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? await renderOgImage(metadata.title, metadata.subtitle, metadata.description)
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: await renderOgImage(DEFAULT_TITLE, "", DEFAULT_DESCRIPTION);
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} catch {
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// Fall through to default image.
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imageResponse = await renderOgImage(DEFAULT_TITLE, "", DEFAULT_DESCRIPTION);
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}
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return renderOgImage(DEFAULT_TITLE, "", DEFAULT_DESCRIPTION);
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const cachedCopy = new Response(imageResponse.body, imageResponse);
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cachedCopy.headers.set("Cache-Control", "public, max-age=3600");
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await cache.put(request, cachedCopy.clone());
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return cachedCopy;
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}
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// Inject metadata into HTML for /bbs/... routes.