90 lines
3 KiB
JavaScript
90 lines
3 KiB
JavaScript
// Cannot use Set-Cookie header for security reasons, use IndexedDB instead
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self.addEventListener("fetch", event =>{
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//TODO: make an endpoint to set the localStorage up then set the form to go to there and have it HTTP 302 or 307 with handle_html for html responses and handle_redirect for the other case
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event.respondWith((async ()=>{
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const resp = await fetch(event.request);
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const body = await resp.text();
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const url = new URL(event.request.url);
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if(url.pathname.endsWith("light-dark-toggle")){
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return await handle_redirect(req);
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}
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else {
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return await handle_html(req,resp);
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}
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})());
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})
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async function handle_redirect(req){
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const go_back_to = req.referrer;
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const db_req = self.indexedDB.open("light-dark-store");
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const up_promise = new Promise((res)=>{
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db_req.onupgradeneeded = (event) => {
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const db = event.target.result;
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IDB_cond_create(db, "light-dark-store", {}).then(res);
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}
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});
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const suc_promise = new Promise((res)=>{
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db_req.onsuccess = (event) => {
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const db = event.target.result;
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const transaction = db.transaction("light-dark-store");
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transaction.oncomplete = res;
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transaction.objectStore("light-dark-store", "readwrite");
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toggleLightDark(transaction);
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transaction.commit();
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};
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};
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await Promise.all([up_promise, suc_promise]);
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const referrer = request.headers.get('Referer') || '/';
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return new Response("You should be getting redirected back to the page you came from shortly",{
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status: 302,
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headers: {
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'Location': referrer
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}
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})
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}
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function IDB_cond_create(db, objectStoreName, opts={}){
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return new Promise((res)=>{
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if(!db.objectStoreNames.contains(objectStoreName)){
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db.createObjectStore(objectStoreName, opts);
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res();
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});
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}
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function toggleLightDark(transaction){
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return new Promise((res)=>{
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const obj_store = transaction.objectStore("light-dark-store");
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const grab = obj_store.get(1);
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grab.onsuccess = (event)=>{
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const val = event.result;
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if(val){
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const yeet = obj_store.delete(1);
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yeet.onsuccess = res;
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}
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else {
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const plonk = obj_store.add({id:1});
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plonk.onsuccess = res;
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}
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}
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});
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}
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async function handle_html(req, resp){
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// TODO: read from indexDB to figure out if we fiddle with the body classes or not
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const obj_store = transaction.objectStore("light-dark-store");
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const grab = obj_store.get(1);
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const toggled = await (new Promise((res)=>{
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grab.onsuccess = (event)=>{
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const val = event.result;
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const toggled = !!val;
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res(toggled);
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}
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}));
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if(!toggled) return resp;
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return new Response(body.replace("<body>", '<body class="toggled">'), {
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headers:resp.headers,
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status: resp.status
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});
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}
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