feat: implement Web Cache API (#15829)

cli/tests/unit/cache_api_test.ts

@@ -0,0 +1,96 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+import {
+  assert,
+  assertEquals,
+  assertFalse,
+  assertRejects,
+} from "./test_util.ts";
+
+Deno.test(async function cacheStorage() {
+  const cacheName = "cache-v1";
+  const _cache = await caches.open(cacheName);
+  assert(await caches.has(cacheName));
+  assert(await caches.delete(cacheName));
+  assertFalse(await caches.has(cacheName));
+});
+
+Deno.test(async function cacheApi() {
+  const cacheName = "cache-v1";
+  const cache = await caches.open(cacheName);
+  // Test cache.put() with url string as key.
+  {
+    const req = "https://deno.com";
+    await cache.put(req, new Response("deno.com - key is string"));
+    const res = await cache.match(req);
+    assertEquals(await res?.text(), "deno.com - key is string");
+    assert(await cache.delete(req));
+  }
+  // Test cache.put() with url instance as key.
+  {
+    const req = new URL("https://deno.com");
+    await cache.put(req, new Response("deno.com - key is URL"));
+    const res = await cache.match(req);
+    assertEquals(await res?.text(), "deno.com - key is URL");
+    assert(await cache.delete(req));
+  }
+  // Test cache.put() with request instance as key.
+  {
+    const req = new Request("https://deno.com");
+    await cache.put(req, new Response("deno.com - key is Request"));
+    const res = await cache.match(req);
+    assertEquals(await res?.text(), "deno.com - key is Request");
+    assert(await cache.delete(req));
+  }
+
+  // Test cache.put() throws with response Vary header set to *.
+  {
+    const req = new Request("https://deno.com");
+    assertRejects(
+      async () => {
+        await cache.put(
+          req,
+          new Response("deno.com - key is Request", {
+            headers: { Vary: "*" },
+          }),
+        );
+      },
+      TypeError,
+      "Vary header must not contain '*'",
+    );
+  }
+
+  // Test cache.match() with same url but different values for Vary header.
+  {
+    await cache.put(
+      new Request("https://example.com/", {
+        headers: {
+          "Accept": "application/json",
+        },
+      }),
+      Response.json({ msg: "hello world" }, {
+        headers: {
+          "Content-Type": "application/json",
+          "Vary": "Accept",
+        },
+      }),
+    );
+    const res = await cache.match("https://example.com/");
+    assertEquals(res, undefined);
+    const res2 = await cache.match(
+      new Request("https://example.com/", {
+        headers: { "Accept": "text/html" },
+      }),
+    );
+    assertEquals(res2, undefined);
+
+    const res3 = await cache.match(
+      new Request("https://example.com/", {
+        headers: { "Accept": "application/json" },
+      }),
+    );
+    assertEquals(await res3?.json(), { msg: "hello world" });
+  }
+
+  assert(await caches.delete(cacheName));
+  assertFalse(await caches.has(cacheName));
+});