Rename all middleware to thingMiddleware

src/middleware/cacheMiddleware.ts

@@ -0,0 +1,28 @@
+import Debug from '@soapbox/stickynotes/debug';
+import { type MiddlewareHandler } from 'hono';
+
+import ExpiringCache from '@/utils/expiring-cache.ts';
+
+const debug = Debug('ditto:middleware:cache');
+
+export const cacheMiddleware = (options: {
+  cacheName: string;
+  expires?: number;
+}): MiddlewareHandler => {
+  return async (c, next) => {
+    const key = c.req.url.replace('http://', 'https://');
+    const cache = new ExpiringCache(await caches.open(options.cacheName));
+    const response = await cache.match(key);
+    if (!response) {
+      debug('Building cache for page', c.req.url);
+      await next();
+      const response = c.res.clone();
+      if (response.status < 500) {
+        await cache.putExpiring(key, response, options.expires ?? 0);
+      }
+    } else {
+      debug('Serving page from cache', c.req.url);
+      return response;
+    }
+  };
+};