1 files changed, 63 insertions, 0 deletions
diff --git a/src/assets/sw.mjs b/src/assets/sw.mjs
new file mode 100644
index 0000000..432e630
--- /dev/null
+++ b/src/assets/sw.mjs
@@ -0,0 +1,63 @@
+const cache_name = "v3"
+
+const install_sw = async event => {
+    const precache = async() => {
+        const cache = await caches.open(cache_name);
+        return cache.addAll([
+            '/index.css',
+            '/prism.css',
+            '/index.js',
+            '/sw.js',
+            '/favicon.svg',
+            '/offline.html',
+            '/'
+        ])
+    }
+    event.waitUntil(precache())
+}
+
+const activate_sw = async event => {
+    const cachepreserve = ['v3'];
+
+    const invalidatecache = async() => {
+        const keys = await caches.keys()
+        Promise.all(
+            keys.map((key) => {
+                if (cachepreserve.indexOf(key) === -1) {
+                    return caches.delete(key)
+                }
+            }))
+    }
+    event.waitUntil(invalidatecache())
+}
+
+const fetch_sw = async event => {
+    const cache_fetch = async() => {
+        if (event.request.method != 'GET') {
+            return
+        }
+        const cacheres = await caches.match(event.request)
+        if (cacheres !== undefined) {
+            return cacheres
+        }
+        try {
+            const response = await fetch(event.request)
+            const cache = await caches.open(cache_name)
+            cache.put(event.request, response.clone())
+            return response
+        } catch {
+            return caches.match('/offline.html')
+        }
+    }
+
+    event.respondWith(cache_fetch())
+}
+
+const main = async() => {
+    self.addEventListener('install', install_sw)
+    self.addEventListener('activate', activate_sw)
+    self.addEventListener('fetch', fetch_sw)
+
+}
+
+main()
+\ No newline at end of file