fix: technical debts left by the Sites, Authors and SEO slices, plus backend support for the new Sites and Authors pagination

web/src/composables/useArticleSites.ts

@@ -0,0 +1,35 @@
+import { computed, ref } from 'vue'
+import { useSites, type Site } from '@/composables/useSites'
+import type { ArticleListQuery } from '@/lib/articleListQuery'
+
+export function useArticleSites(shownSite: () => string) {
+	const { listSites } = useSites()
+	const sites = ref<Site[]>([])
+	const sitesSettled = ref(false)
+
+	const severalSites = computed(() => sites.value.length > 1)
+	const siteName = computed(
+		() => sites.value.find((site) => site.key === shownSite())?.name ?? shownSite(),
+	)
+
+	async function fetchSites() {
+		try {
+			sites.value = await listSites()
+		} catch {
+			sites.value = []
+		}
+	}
+
+	function loadSites() {
+		return fetchSites().finally(() => {
+			sitesSettled.value = true
+		})
+	}
+
+	function usableSite(query: ArticleListQuery): ArticleListQuery {
+		const known = severalSites.value && sites.value.some((site) => site.key === query.site)
+		return query.site && !known ? { ...query, site: '' } : query
+	}
+
+	return { sites, sitesSettled, severalSites, siteName, loadSites, usableSite }
+}