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cache alternate URLs in UrlPreviewService

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This commit is contained in:
Hazelnoot 2025-05-28 13:32:21 -04:00
parent 865b198ab3
commit a91c0de9b5
1 changed files with 17 additions and 1 deletions
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18
packages/backend/src/server/web/UrlPreviewService.ts
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@ -185,7 +185,7 @@ export class UrlPreviewService {
return;
}
const cacheKey = `${url}@${lang}@${cacheFormatVersion}`;
const cacheKey = getCacheKey(url, lang);
if (await this.sendCachedPreview(cacheKey, reply, fetch)) {
return;
}
@ -236,6 +236,18 @@ export class UrlPreviewService {
// Await this to avoid hammering redis when a bunch of URLs are fetched at once
await this.previewCache.set(cacheKey, summary);
// Also cache the response URL in case of redirects
if (summary.url !== url) {
const responseCacheKey = getCacheKey(summary.url, lang);
await this.previewCache.set(responseCacheKey, summary);
}
// Also cache the ActivityPub URL, if different from the others
if (summary.activityPub && summary.activityPub !== summary.url) {
const apCacheKey = getCacheKey(summary.activityPub, lang);
await this.previewCache.set(apCacheKey, summary);
}
// Cache 1 day (matching redis), but only once we finalize the result
if (!summary.activityPub || summary.haveNoteLocally) {
reply.header('Cache-Control', 'public, max-age=86400');
@ -552,3 +564,7 @@ export class UrlPreviewService {
return true;
}
}
function getCacheKey(url: string, lang = 'none') {
return `${url}@${lang}@${cacheFormatVersion}`;
}