feat(blog): add /blog/rss.xml feed (fixes 404)

app/blog/page.tsx

@@ -7,6 +7,11 @@ export const revalidate = 60
 export const metadata: Metadata = {
   title: 'Blog',
   description: 'Articles, guides, and insights about software and productivity',
+  alternates: {
+    types: {
+      'application/rss+xml': '/blog/rss.xml',
+    },
+  },
 }
 
 export default async function Page() {

app/blog/rss.xml/route.ts

@@ -0,0 +1,72 @@
+import { getBlogList } from '@/lib/api'
+
+// Regenerate at most hourly so new posts show up without a full rebuild.
+export const revalidate = 3600
+
+const SITE = (process.env.NEXT_PUBLIC_SITE_URL || 'https://www.saasrow.com').replace(
+  /\/+$/,
+  '',
+)
+
+function escapeXml(value: string): string {
+  return value
+    .replace(/&/g, '&')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;')
+    .replace(/'/g, '&apos;')
+}
+
+export async function GET() {
+  const posts = await getBlogList()
+
+  const lastBuildDate = new Date().toUTCString()
+  const latest = posts[0]
+  const pubDate = latest
+    ? new Date(latest.published_at || latest.created_at).toUTCString()
+    : lastBuildDate
+
+  const items = posts
+    .map((post) => {
+      const link = `${SITE}/blog/${post.slug}`
+      const date = new Date(post.published_at || post.created_at).toUTCString()
+      const parts = [
+        `      <title>${escapeXml(post.title)}</title>`,
+        `      <link>${escapeXml(link)}</link>`,
+        `      <guid isPermaLink="true">${escapeXml(link)}</guid>`,
+        `      <pubDate>${date}</pubDate>`,
+      ]
+      if (post.excerpt) {
+        parts.push(`      <description>${escapeXml(post.excerpt)}</description>`)
+      }
+      if (post.author_name) {
+        parts.push(`      <dc:creator>${escapeXml(post.author_name)}</dc:creator>`)
+      }
+      for (const tag of post.tags ?? []) {
+        parts.push(`      <category>${escapeXml(tag)}</category>`)
+      }
+      return `    <item>\n${parts.join('\n')}\n    </item>`
+    })
+    .join('\n')
+
+  const xml = `<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/">
+  <channel>
+    <title>SaaSRow Blog</title>
+    <link>${SITE}/blog</link>
+    <description>Articles, guides, and insights about software and productivity</description>
+    <language>en</language>
+    <lastBuildDate>${lastBuildDate}</lastBuildDate>
+    <pubDate>${pubDate}</pubDate>
+    <atom:link href="${SITE}/blog/rss.xml" rel="self" type="application/rss+xml" />
+${items}
+  </channel>
+</rss>`
+
+  return new Response(xml, {
+    headers: {
+      'Content-Type': 'application/rss+xml; charset=utf-8',
+      'Cache-Control': 'public, max-age=0, s-maxage=3600, stale-while-revalidate=86400',
+    },
+  })
+}