AstroPress

// src/pages/api/revalidate.ts
import type { APIRoute } from 'astro';

export const POST: APIRoute = async ({ request, locals }) => {
  const payload = await request.clone().json().catch(() => ({}));
  const { slug, type, action, urls, secret } = payload;

  // 1. Verify shared secret token
  const expectedSecret = (locals as any)?.runtime?.env?.REVALIDATE_SECRET || process.env.REVALIDATE_SECRET;
  if (expectedSecret && secret !== expectedSecret) {
    return new Response(JSON.stringify({ error: 'Unauthorized handshake' }), { status: 401 });
  }

  // 2. Instant handshake probe for AstroPress admin dashboard
  if (type === 'test' || action === 'ping' || slug === 'test-connection') {
    return new Response(JSON.stringify({
      success: true,
      status: 'connected',
      framework: 'Astro SSR on Cloudflare Edge',
      timestamp: Date.now()
    }), { status: 200 });
  }

  // 3. Resolve affected route paths
  const affected: string[] = Array.isArray(urls) && urls.length > 0 
    ? urls 
    : (slug ? ['/' + slug.replace(/^\//, '')] : ['/']);

  if (!affected.includes('/')) affected.push('/');

  // 4. Invalidate Cloudflare Worker caches.default in-memory store
  try {
    const cache = (globalThis as any).caches?.default;
    if (cache) {
      for (const u of affected) {
        const targetUrl = new URL(u, request.url).href;
        await cache.delete(new Request(targetUrl));
      }
    }
  } catch (err) {
    console.error('Worker cache delete error:', err);
  }

  // 5. Trigger Cloudflare Zone Cache API purge (<150ms)
  const cfZoneId = (locals as any)?.runtime?.env?.CF_ZONE_ID || process.env.CF_ZONE_ID;
  const cfApiToken = (locals as any)?.runtime?.env?.CF_API_TOKEN || process.env.CF_API_TOKEN;
  const frontendUrl = (locals as any)?.runtime?.env?.FRONTEND_URL || process.env.FRONTEND_URL;

  let cfPurged = false;
  if (cfZoneId && cfApiToken && frontendUrl) {
    try {
      const purgeUrls = affected.map(u => new URL(u, frontendUrl).href);
      const cfRes = await fetch(`https://api.cloudflare.com/client/v4/zones/${cfZoneId}/purge_cache`, {
        method: 'POST',
        headers: {
          'Authorization': `Bearer ${cfApiToken}`,
          'Content-Type': 'application/json'
        },
        body: JSON.stringify({ files: purgeUrls })
      });
      cfPurged = cfRes.ok;
    } catch (e) {
      console.error('CF Zone Purge error:', e);
    }
  }

  // 6. Pre-warm canonical routes to eliminate visitor cold boots
  if (frontendUrl) {
    for (const u of affected) {
      fetch(new URL(u, frontendUrl).href, {
        headers: { 'User-Agent': 'AstroPress-EdgeWarmer/2.5' }
      }).catch(() => {});
    }
  }

  return new Response(JSON.stringify({
    success: true,
    revalidated: true,
    purged: affected,
    cfPurged
  }), {
    status: 200,
    headers: { 'Content-Type': 'application/json' }
  });
};