Serve the legacy extensionless article address as HTML

Author: SpriCoder

scripts/postbuild.mjs

@@ -5,10 +5,10 @@ const baseline = JSON.parse(fs.readFileSync('migration/baseline.json', 'utf8'));
 for (const post of baseline.filter(post => post.published)) {
   for (const legacyUrl of post.legacyUrls || []) {
     const destination = path.join('dist', decodeURI(legacyUrl).replace(/^\//, ''));
-    if (fs.existsSync(destination) && fs.statSync(destination).isDirectory()) continue;
-    fs.mkdirSync(path.dirname(destination), { recursive: true });
-    // Preserve the old extensionless document, including query-string links to it.
-    fs.copyFileSync(path.join('dist', post.url, 'index.html'), destination);
+    if (fs.existsSync(destination) && fs.statSync(destination).isFile()) fs.unlinkSync(destination);
+    fs.mkdirSync(destination, { recursive: true });
+    // A directory index gives the old extensionless address an HTML response.
+    fs.copyFileSync(path.join('dist', post.url, 'index.html'), path.join(destination, 'index.html'));
   }
 }
 console.log('Legacy URL compatibility files ready.');

scripts/verify-migration.py

@@ -43,7 +43,7 @@ def inner(node):
         check(len(body) == 1 and inner(body[0]) == inner(snapshot), f"Rendered body changed: {post['url']}")
         check(document.xpath('string(//h1)') == post['title'], f"Article title mismatch: {post['url']}")
     for url in item['legacyUrls']:
-        check((ROOT / 'dist' / url.lstrip('/')).is_file(), f"Legacy compatibility URL missing: {url}")
+        check((ROOT / 'dist' / url.lstrip('/') / 'index.html').is_file(), f"Legacy compatibility URL missing: {url}")
 
 assets = json.loads((ROOT / 'migration/assets.json').read_text())
 for asset in assets: