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4 lines
1.8 KiB
JavaScript
4 lines
1.8 KiB
JavaScript
/* global self ReadableStream Response */
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// https://github.com/jimmywarting/StreamSaver.js/blob/master/sw.js
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// MIT License
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self.addEventListener("install",()=>{self.skipWaiting()}),self.addEventListener("activate",e=>{e.waitUntil(self.clients.claim())});const map=new Map;function createStream(e){return new ReadableStream({start(t){e.onmessage=(({data:e})=>{if("end"===e)return t.close();"abort"!==e?t.enqueue(e):t.error("Aborted the download")})},cancel(){console.log("user aborted")}})}self.onmessage=(e=>{if("ping"===e.data)return;const t=e.data,n=t.url||self.registration.scope+Math.random()+"/"+("string"==typeof t?t:t.filename),a=e.ports[0],s=new Array(3);s[1]=t,s[2]=a,e.data.readableStream?s[0]=e.data.readableStream:e.data.transferringReadable?a.onmessage=(e=>{a.onmessage=null,s[0]=e.data.readableStream}):s[0]=createStream(a),map.set(n,s),a.postMessage({download:n})}),self.onfetch=(e=>{const t=e.request.url;if(t.endsWith("/ping"))return e.respondWith(new Response("pong"));const n=map.get(t);if(!n)return null;const[a,s,o]=n;map.delete(t);const r=new Headers({"Content-Type":"application/octet-stream; charset=utf-8","Content-Security-Policy":"default-src 'none'","X-Content-Security-Policy":"default-src 'none'","X-WebKit-CSP":"default-src 'none'","X-XSS-Protection":"1; mode=block"});let i=new Headers(s.headers||{});i.has("Content-Length")&&r.set("Content-Length",i.get("Content-Length")),i.has("Content-Disposition")&&r.set("Content-Disposition",i.get("Content-Disposition")),s.size&&(console.warn("Depricated"),r.set("Content-Length",s.size));let l="string"==typeof s?s:s.filename;l&&(console.warn("Depricated"),l=encodeURIComponent(l).replace(/['()]/g,escape).replace(/\*/g,"%2A"),r.set("Content-Disposition","attachment; filename*=UTF-8''"+l)),e.respondWith(new Response(a,{headers:r})),o.postMessage({debug:"Download started"})}); |