Refactor sw.js to support custom headers in registerCache function

public/sw.js

@@ -11,11 +11,20 @@ self.addEventListener('fetch', (event) => {
                     break
                 }
                 case "img": {
-                    event.respondWith(getImg(url))
+                    event.respondWith(getSource(url))
                     break
                 }
                 case "register": {
-                    event.respondWith(registerCache(url, event.request.arrayBuffer()))
+                    let targerUrl = url
+                    const headers = event.request.headers
+                    const headerUrl = headers.get('x-register-url')
+                    if(headerUrl){
+                        targerUrl = new URL(headerUrl)
+                    }
+                    const noContentType = headers.get('x-no-content-type') === 'true'
+                    event.respondWith(
+                        registerCache(targerUrl, event.request.arrayBuffer(), noContentType)
+                    )
                     break
                 }
                 case "init":{
@@ -31,6 +40,17 @@ self.addEventListener('fetch', (event) => {
             event.respondWith(new Response(`${error}`))
         }
     }
+    if(path[1] === 'transformers'){
+        event.respondWith((async () => {
+            const cache = await caches.open('risuCache')
+            const res = await cache.match(url)
+            if(res){
+                return res
+            }else{
+                return await fetch(event.request)
+            }
+        })())
+    }
 })
 
 
@@ -42,7 +62,7 @@ async function checkCache(url){
     }))
 }
 
-async function getImg(url){
+async function getSource(url){
     const cache = await caches.open('risuCache')
     return await cache.match(url)
 }
@@ -51,18 +71,22 @@ async function check(){
 
 }
 
-async function registerCache(urlr, buffer){
+async function registerCache(urlr, buffer, noContentType = false){
     const cache = await caches.open('risuCache')
     const url = new URL(urlr)
     let path = url.pathname.split('/')
     path[2] = 'img'
     url.pathname = path.join('/')
     const buf = new Uint8Array(await buffer)
+    let headers = {
+        "cache-control": "max-age=604800",
+        "content-type": "image/png"
+    }
+    if(noContentType){
+        delete headers["content-type"]
+    }
     await cache.put(url, new Response(buf, {
-        headers: {
-            "cache-control": "max-age=604800",
-            "content-type": "image/png"
-        }
+        headers
     }))
     return new Response(JSON.stringify({
         "done": true