src/middleware/cache.ts


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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();
  };
}