feat(cache): add duration option

runtime_tests/deno/cache.test.ts

@@ -3,7 +3,7 @@ import { cache } from '../../src/middleware/cache/index.ts'
 import { expect } from '@std/expect'
 import { FakeTime } from '@std/testing/time'
 
-Deno.test('Get cached text', async () => {
+Deno.test('Should return cached response', async () => {
   const c = await caches.open('my-app')
   await c.delete('http://localhost')
 
@@ -26,13 +26,14 @@ Deno.test('Get cached text', async () => {
   await app.request('http://localhost')
   const res = await app.request('http://localhost')
   expect(await res.text()).toBe('Hello Hono')
+  expect(res.headers.get('Hono-Cached-Time')).toBeNull()
   expect(res).not.toBeNull()
   expect(res.status).toBe(200)
 })
 
 Deno.test(
   {
-    name: 'Do not get cached text over duration',
+    name: 'Should not return cached response over duration',
     sanitizeResources: false,
   },
   async () => {
@@ -58,9 +59,10 @@ Deno.test(
     })
 
     await app.request('http://localhost')
-    await time.tickAsync(600_100) // 10min
+    await time.tickAsync(60000)
     const res = await app.request('http://localhost')
     expect(await res.text()).toBe('Not Found')
+    expect(res.headers.get('Hono-Cached-Time')).toBeNull()
     expect(res).not.toBeNull()
     expect(res.status).toBe(200)
   }

src/middleware/cache/index.ts

@@ -102,7 +102,7 @@
     }
   }
 
-  const durationHeader = 'Hono-Cache-Duration'
+  const cachedTime = 'Hono-Cached-Time'
 
   return async function cache(c, next) {
     let key = c.req.url
@@ -116,12 +116,10 @@
     const response = await cache.match(key)
     if (response) {
       if (options.duration) {
-        const duration = Number(response.headers.get(durationHeader))
+        const duration = Number(response.headers.get(cachedTime)) + options.duration * 1000
         if (duration && duration > Date.now()) {
-          const newResponse = new Response(response.body, response)
-          newResponse.headers.delete(durationHeader)
-          return newResponse
+          return new Response(response.body, response).headers.delete(cachedTime)
         }
       } else {
         return new Response(response.body, response)
       }
@@ -134,8 +132,7 @@
     addHeader(c)
     const res = c.res.clone()
     if (options.duration) {
-      const duration = String(Date.now() + options.duration * 1000)
-      res.headers.set(durationHeader, duration)
+      res.headers.set(cachedTime, String(Date.now()))
     }
     if (options.wait) {
       await cache.put(key, res)