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backend/node_modules/hono/dist/middleware/cache/index.js

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+// src/middleware/cache/index.ts
+var defaultCacheableStatusCodes = [200];
+var shouldSkipCache = (res) => {
+  const vary = res.headers.get("Vary");
+  return vary && vary.includes("*");
+};
+var cache = (options) => {
+  if (!globalThis.caches) {
+    console.log("Cache Middleware is not enabled because caches is not defined.");
+    return async (_c, next) => await next();
+  }
+  if (options.wait === void 0) {
+    options.wait = false;
+  }
+  const cacheControlDirectives = options.cacheControl?.split(",").map((directive) => directive.toLowerCase());
+  const varyDirectives = Array.isArray(options.vary) ? options.vary : options.vary?.split(",").map((directive) => directive.trim());
+  if (options.vary?.includes("*")) {
+    throw new Error(
+      'Middleware vary configuration cannot include "*", as it disallows effective caching.'
+    );
+  }
+  const cacheableStatusCodes = new Set(
+    options.cacheableStatusCodes ?? defaultCacheableStatusCodes
+  );
+  const addHeader = (c) => {
+    if (cacheControlDirectives) {
+      const existingDirectives = c.res.headers.get("Cache-Control")?.split(",").map((d) => d.trim().split("=", 1)[0]) ?? [];
+      for (const directive of cacheControlDirectives) {
+        let [name, value] = directive.trim().split("=", 2);
+        name = name.toLowerCase();
+        if (!existingDirectives.includes(name)) {
+          c.header("Cache-Control", `${name}${value ? `=${value}` : ""}`, { append: true });
+        }
+      }
+    }
+    if (varyDirectives) {
+      const existingDirectives = c.res.headers.get("Vary")?.split(",").map((d) => d.trim()) ?? [];
+      const vary = Array.from(
+        new Set(
+          [...existingDirectives, ...varyDirectives].map((directive) => directive.toLowerCase())
+        )
+      ).sort();
+      if (vary.includes("*")) {
+        c.header("Vary", "*");
+      } else {
+        c.header("Vary", vary.join(", "));
+      }
+    }
+  };
+  return async function cache2(c, next) {
+    let key = c.req.url;
+    if (options.keyGenerator) {
+      key = await options.keyGenerator(c);
+    }
+    const cacheName = typeof options.cacheName === "function" ? await options.cacheName(c) : options.cacheName;
+    const cache3 = await caches.open(cacheName);
+    const response = await cache3.match(key);
+    if (response) {
+      return new Response(response.body, response);
+    }
+    await next();
+    if (!cacheableStatusCodes.has(c.res.status)) {
+      return;
+    }
+    addHeader(c);
+    if (shouldSkipCache(c.res)) {
+      return;
+    }
+    const res = c.res.clone();
+    if (options.wait) {
+      await cache3.put(key, res);
+    } else {
+      c.executionCtx.waitUntil(cache3.put(key, res));
+    }
+  };
+};
+export {
+  cache
+};