| 1 | const SCOPE="/fonts/"
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| 2 | self.addEventListener("message", function({data:{familyName, src, scope}}){
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| 3 | if(familyName && src){
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| 4 | self.caches.open("v1").then(cache=>{
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| 5 | return fetch(src).then(response=>{
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| 6 | cache.put(SCOPE+familyName,response.clone())
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| 7 | })
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| 8 | })
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| 9 | }
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| 10 | })
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| 11 |
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| 12 | self.addEventListener("fetch", function(e){
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| 13 | const path=new URL(e.request.url).pathname
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| 14 | if(!(path+"/").startsWith(SCOPE)){
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| 15 | return
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| 16 | }
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| 17 |
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| 18 | return e.respondWith(self.caches.match(e.request.url).then(function(cached){
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| 19 | if((path+"/")==SCOPE){
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| 20 | return fetch(e.request).then(function(response){
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| 21 | if(!response.ok){
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| 22 | if(cached){
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| 23 | return cached.clone().text()
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| 24 | }else{
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| 25 | return Promise.resolve("")
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| 26 | }
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| 27 | }
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| 28 | return response.text()
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| 29 | })
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| 30 | .then(fonts=>{
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| 31 | fonts=new Set(fonts.split(",").filter(a=>!!a))
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| 32 | return self.caches.open("v1")
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| 33 | .then(cache=>cache.keys())
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| 34 | .then(cached=>{
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| 35 | cached.forEach(a=>{
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| 36 | const path=new URL(a.url).pathname
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| 37 | if(path.startsWith(SCOPE)){
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| 38 | const name=path.split("/").pop()
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| 39 | if(name && name!="index.html"){
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| 40 | fonts.add(name)
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| 41 | }
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| 42 | }
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| 43 | })
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| 44 | return Array.from(fonts)
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| 45 | })
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| 46 | })
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| 47 | .then(fonts=>new Response(fonts.join(",")))
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| 48 | }
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| 49 |
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| 50 | return cached||fetch(e.request)
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| 51 | }))
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| 52 | })
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