feat(cache): add cacheConfigSetter & cacheControlMiddleware by #90

src/middleware/cache.ts

@@ -0,0 +1,35 @@
+import { config } from "dotenv";
+import { AniwatchAPICache } from "../config/cache.js";
+import type { MiddlewareHandler } from "hono";
+
+config();
+
+// Define middleware to add Cache-Control header
+export const cacheControlMiddleware: MiddlewareHandler = async (c, next) => {
+  const sMaxAge = process.env.ANIWATCH_API_S_MAXAGE || "60";
+  const staleWhileRevalidate =
+    process.env.ANIWATCH_API_STALE_WHILE_REVALIDATE || "30";
+
+  c.header(
+    "Cache-Control",
+    `s-maxage=${sMaxAge}, stale-while-revalidate=${staleWhileRevalidate}`
+  );
+
+  await next();
+};
+
+export function cacheConfigSetter(keySliceIndex: number): MiddlewareHandler {
+  return async (c, next) => {
+    const { pathname, search } = new URL(c.req.url);
+
+    c.set("CACHE_CONFIG", {
+      key: `${pathname.slice(keySliceIndex) + search}`,
+      duration: Number(
+        c.req.header(AniwatchAPICache.CACHE_EXPIRY_HEADER_NAME) ||
+          AniwatchAPICache.DEFAULT_CACHE_EXPIRY_SECONDS
+      ),
+    });
+
+    await next();
+  };
+}