1 files changed, 61 insertions, 0 deletions
diff --git a/assets/sw.js b/assets/sw.js
new file mode 100644
index 0000000..e6b6538
--- /dev/null
+++ b/assets/sw.js
@@ -0,0 +1,61 @@
+import metadata from "/assets/metadata.js"
+
+const data = metadata()
+
+const sw_cache = {
+    offline: "/offline.html",
+    default: [
+        "/assets/index.css",
+        "/vendor/prism.css",
+        "/assets/index.js",
+        "/favicon/icon.svg",
+        "/offline.html",
+    ],
+    store: data.version,
+};
+
+(function() {
+    self.addEventListener("install", event => {
+        self.skipWaiting();
+        event.waitUntil((async() => {
+            const cache = await self.caches.open(sw_cache.store);
+            return cache.addAll(sw_cache.default);
+        })());
+    });
+
+    self.addEventListener("activate", event => {
+        event.waitUntil((async() => {
+            const keys = await self.caches.keys();
+            return Promise.all(keys.map(key => {
+                if (key !== sw_cache.store) {
+                    return self.caches.delete(key);
+                }
+            }));
+        })());
+    });
+
+    self.addEventListener("fetch", event => {
+        event.respondWith((async() => {
+            if (event.request.method != "GET") {
+                return fetch(event.request);
+            }
+
+            const req_url = new URL(event.request.url);
+            if (req_url.origin != self.location.origin) {
+                return fetch(event.request);
+            }
+
+            const cacheres = await self.caches.match(event.request);
+            return cacheres || (async() => {
+                try {
+                    const response = await self.fetch(event.request);
+                    const cache = await self.caches.open(sw_cache.store);
+                    cache.put(event.request, response.clone());
+                    return response;
+                } catch {
+                    return self.caches.match(sw_cache.offline);
+                }
+            })();
+        })());
+    });
+})();
+\ No newline at end of file