From c048011b07fe531a23eb70c09342cd011fe059f4 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Thu, 12 Aug 2021 22:42:08 -0400
Subject: [PATCH] Cache compiled assets in service worker

---
 src/sw.js | 43 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/src/sw.js b/src/sw.js
index cc419f74..23a63c38 100644
--- a/src/sw.js
+++ b/src/sw.js
@@ -49,6 +49,35 @@ const maybeShowNotification = async (event) => {
   }
 }
 
+const shouldCache = process.env.NODE_ENV === 'production'
+const cacheKey = 'pleroma-fe'
+const cacheFiles = self.serviceWorkerOption.assets
+
+self.addEventListener('install', async (event) => {
+  if (shouldCache) {
+    event.waitUntil((async () => {
+      const cache = await caches.open(cacheKey)
+      await cache.addAll(cacheFiles)
+    })())
+  }
+})
+
+self.addEventListener('activate', async (event) => {
+  if (shouldCache) {
+    event.waitUntil((async () => {
+      const cache = await caches.open(cacheKey)
+      const keys = await cache.keys()
+      await Promise.all(
+        keys.filter(request => {
+          const url = new URL(request.url)
+          const shouldKeep = cacheFiles.includes(url.pathname)
+          return !shouldKeep
+        }).map(k => cache.delete(k))
+      )
+    })())
+  }
+})
+
 self.addEventListener('push', async (event) => {
   if (event.data) {
     event.waitUntil(maybeShowNotification(event))
@@ -68,4 +97,16 @@ self.addEventListener('notificationclick', (event) => {
   }))
 })
 
-self.addEventListener('fetch', _ => _)
+self.addEventListener('fetch', async (event) => {
+  if (shouldCache) {
+    event.respondWith((async () => {
+      const r = await caches.match(event.request)
+      console.log(`[Service Worker] Fetching resource: ${event.request.url}`)
+      if (r) {
+        return r
+      }
+      const response = await fetch(event.request)
+      return response
+    })())
+  }
+})