feat: enhance internationalization support with dynamic routing

src/pages/[lang]/rss.xml.ts

@@ -0,0 +1,86 @@
+import type { APIContext } from 'astro'
+import type { CollectionEntry } from 'astro:content'
+import themeConfig from '@/config'
+import rss from '@astrojs/rss'
+import { getCollection } from 'astro:content'
+import MarkdownIt from 'markdown-it'
+import sanitizeHtml from 'sanitize-html'
+
+const parser = new MarkdownIt()
+const { title, description, url } = themeConfig.site
+const { locale: defaultLocale, moreLocale } = themeConfig.global
+const followConfig = themeConfig.seo?.follow
+
+// Extract first 100 chars from content as description
+function getExcerpt(content: string): string {
+  const plainText = sanitizeHtml(
+    parser.render(content),
+    {
+      allowedTags: [],
+      allowedAttributes: {},
+    },
+  )
+
+  return `${plainText.slice(0, 100).trim()}...`
+}
+
+// Return 404 response for invalid language routes
+function return404() {
+  return new Response(null, {
+    status: 404,
+    statusText: 'Not found',
+  })
+}
+
+// Add getStaticPaths for dynamic routes
+export function getStaticPaths() {
+  return moreLocale.map(lang => ({ params: { lang } }))
+}
+
+// Generate RSS feed for non-default languages
+export async function GET({ params }: APIContext) {
+  const lang = params.lang as string
+
+  // Only generate RSS for valid non-default languages
+  if (!moreLocale.includes(lang)) {
+    return return404()
+  }
+
+  // Get posts for specific language (include universal posts)
+  const posts = await getCollection(
+    'posts',
+    ({ data }: { data: CollectionEntry<'posts'>['data'] }) =>
+      (!data.draft && (data.lang === lang || data.lang === '')),
+  )
+
+  return rss({
+    title: `${title} (${lang})`,
+    description,
+    site: url,
+    stylesheet: '/rss/styles.xsl',
+    // Map posts to RSS items with language-specific URLs
+    items: posts.map(post => ({
+      title: post.data.title,
+      pubDate: post.data.published,
+      description: post.data.description || getExcerpt(post.body),
+      link: `/${lang}/posts/${post.slug}/`,
+      content: sanitizeHtml(
+        parser.render(post.body),
+        {
+          allowedTags: sanitizeHtml.defaults.allowedTags.concat(['img']),
+        },
+      ),
+    })),
+    // Add language and follow challenge info
+    customData: `
+      <language>${lang}</language>
+      ${followConfig?.feedID && followConfig?.userID
+          ? `<follow_challenge>
+          <feedId>${followConfig.feedID}</feedId>
+          <userId>${followConfig.userID}</userId>
+        </follow_challenge>`
+          : ''
+      }
+    `.trim(),
+  })
+}