Try adding subdomain support

app.js

@@ -160,11 +160,35 @@ router.get('/', async ctx => {
 router.get('/ipfs/:cid/:path(.+)', serveFile);
 router.get('/ipfs/:cid', serveFile);
 
+const handleSubdomain = async (ctx, next) => {
+    const hostname = ctx.hostname;
+    const parts = hostname.split('.');
+    if (parts.length > 2) {
+        const subdomain = parts[0];
+        try {
+            // Check if the subdomain is a valid CID
+            const cid = multibase.decode(subdomain);
+            // Set the params to be used by serveFile
+            ctx.params = ctx.params || {};
+            ctx.params.cid = subdomain;
+            ctx.params.path = ctx.path.slice(1); // Remove leading slash
+            await serveFile(ctx);
+        } catch (error) {
+            // If it's not a valid CID, continue to the next middleware
+            console.error('Invalid CID in subdomain:', error);
+            await next();
+        }
+    } else {
+        await next();
+    }
+};
+
 app
     .use(async (ctx, next) => {
         console.log(ctx.method, ctx.path);
         await next();
     })
+    .use(handleSubdomain)
     .use(cors({ credentials: true }))
     .use(router.routes())
     .use(router.allowedMethods());

test/app.test.js

@@ -16,6 +16,37 @@ test('/', async t => {
     t.match(text, /vgrichina\/nearfs/);
 });
 
+test('handleSubdomain middleware serves content for valid CID subdomains', async t => {
+    await loadCar('test/data/hello.car');
+
+    const { status, text } = await request
+        .get('/')
+        .set('Host', 'bafybeicit72w2sl3agal2jftpkrzwd773fjgdk4dym7pq2pbojyif72v5e.example.com');
+
+    t.isEqual(status, 200);
+    t.isEqual(text, 'Hello, World\n');
+});
+
+test('handleSubdomain middleware ignores invalid CID subdomains', async t => {
+    const { status, text } = await request
+        .get('/')
+        .set('Host', 'invalid-cid.example.com');
+
+    t.isEqual(status, 200);
+    t.match(text, /vgrichina\/nearfs/);
+});
+
+test('handleSubdomain middleware serves content for valid CID subdomains with path', async t => {
+    await loadCar('test/data/littlelink.car');
+
+    const { status, headers } = await request
+        .get('/css/normalize.css')
+        .set('Host', 'bafybeiepywlzwr2yzyin2bo7k2v5oi37lsgleyvfrf6erjvlze2qec6wkm.example.com');
+
+    t.isEqual(status, 200);
+    t.isEqual(headers['content-type'], 'text/css; charset=utf-8');
+});
+
 test('/ipfs/:cid not found', async t => {
     const { status } = await request.get('/ipfs/bafkreib3mbbrhmal34xx7loxzxc4ue36y5rg7wvc24xwryg2j2ozek3p4y');
     t.isEqual(status, 404);