Refactor Webmentions component to improve display of likes and reposts count

src/components/Webmentions.astro

@@ -42,7 +42,7 @@ const hasAny = facepile.length > 0 || replies.length > 0 || mentions.length > 0;
 					{likes.length > 0 && (
 						<div class="facepile">
 							<h3>
-								{likes.length} {t(locale, likes.length === 1 ? 'webmentions.like' : 'webmentions.likes')}
+								{`${likes.length} ${t(locale, likes.length === 1 ? 'webmentions.like' : 'webmentions.likes')}`}
 							</h3>
 							<ul>
 								{likes.map((m) => (
@@ -67,8 +67,7 @@ const hasAny = facepile.length > 0 || replies.length > 0 || mentions.length > 0;
 					{reposts.length > 0 && (
 						<div class="facepile">
 							<h3>
-								{reposts.length}{' '}
-								{t(locale, reposts.length === 1 ? 'webmentions.repost' : 'webmentions.reposts')}
+								{`${reposts.length} ${t(locale, reposts.length === 1 ? 'webmentions.repost' : 'webmentions.reposts')}`}
 							</h3>
 							<ul>
 								{reposts.map((m) => (

src/lib/webmentions.ts

@@ -1,8 +1,11 @@
 /**
  * Build-time Webmention fetcher via webmention.io API.
  *
- * Requires WEBMENTION_TOKEN in the environment (see .env.local / .env.production).
- * Token is read-only and is issued per registered webmention.io domain.
+ * Requires WEBMENTION_TOKEN in the environment. Token is read-only and
+ * issued per registered webmention.io domain.
+ *
+ * Fetches per target URL (not domain-wide) to avoid inconsistencies when
+ * a domain is registered more than once at webmention.io.
  */
 
 export type WMProperty = 'in-reply-to' | 'like-of' | 'repost-of' | 'bookmark-of' | 'mention-of';
@@ -37,59 +40,52 @@ interface WMResponse {
 
 const API = 'https://webmention.io/api/mentions.jf2';
 
-let cache: WMResponse | null = null;
+const perTargetCache = new Map<string, WMEntry[]>();
 
-async function fetchAll(): Promise<WMResponse> {
-	if (cache) return cache;
+async function fetchForTarget(target: string): Promise<WMEntry[]> {
 	const token = import.meta.env.WEBMENTION_TOKEN;
 	if (!token) {
 		console.warn('[webmentions] WEBMENTION_TOKEN is not set — skipping fetch.');
-		cache = { type: 'feed', children: [] };
-		return cache;
+		return [];
 	}
-	const entries: WMEntry[] = [];
-	let page = 0;
-	const perPage = 100;
-	while (true) {
-		const url = new URL(API);
-		url.searchParams.set('domain', 'adrian-altner.de');
-		url.searchParams.set('token', token);
-		url.searchParams.set('per-page', String(perPage));
-		url.searchParams.set('page', String(page));
-		const res = await fetch(url);
-		if (!res.ok) {
-			console.warn(`[webmentions] API ${res.status} ${res.statusText}`);
-			break;
-		}
-		const json = (await res.json()) as WMResponse;
-		entries.push(...(json.children ?? []));
-		if (!json.children || json.children.length < perPage) break;
-		page += 1;
+	const url = new URL(API);
+	url.searchParams.set('target', target);
+	url.searchParams.set('token', token);
+	url.searchParams.set('per-page', '100');
+	const res = await fetch(url);
+	if (!res.ok) {
+		console.warn(`[webmentions] API ${res.status} ${res.statusText} for ${target}`);
+		return [];
 	}
-	cache = { type: 'feed', children: entries };
-	return cache;
+	const json = (await res.json()) as WMResponse;
+	return json.children ?? [];
 }
 
 /**
- * Return all webmentions targeting a given absolute URL.
- * Matches both with and without trailing slash; ignores hash/query.
+ * Return all webmentions targeting a given absolute URL. Tries both the
+ * canonical URL and its trailing-slash variant, since webmention.io
+ * indexes targets verbatim.
  */
 export async function getMentionsFor(target: string | URL): Promise<WMEntry[]> {
-	const { children } = await fetchAll();
-	const wanted = normalize(target);
-	return children.filter((m) => {
-		const t = m['wm-target'];
-		if (!t) return false;
-		return normalize(t) === wanted;
-	});
-}
+	const canonical = typeof target === 'string' ? target : target.toString();
+	const withSlash = canonical.endsWith('/') ? canonical : `${canonical}/`;
+	const withoutSlash = canonical.replace(/\/+$/, '');
 
-function normalize(u: string | URL): string {
-	const url = typeof u === 'string' ? new URL(u) : new URL(u.toString());
-	url.hash = '';
-	url.search = '';
-	const path = url.pathname.replace(/\/+$/, '');
-	return `${url.origin}${path}`;
+	const cached = perTargetCache.get(canonical);
+	if (cached) return cached;
+
+	const [a, b] = await Promise.all([fetchForTarget(withSlash), fetchForTarget(withoutSlash)]);
+	const seen = new Set<number>();
+	const merged: WMEntry[] = [];
+	for (const m of [...a, ...b]) {
+		const id = m['wm-id'];
+		if (id == null || seen.has(id)) continue;
+		seen.add(id);
+		merged.push(m);
+	}
+
+	perTargetCache.set(canonical, merged);
+	return merged;
 }
 
 export function groupMentions(mentions: WMEntry[]): {