refactor!: optimize the resource hints (#1717)

Improved the data structure for defining resource hints to the browser.

assets/js/data/swconf.js

@@ -22,20 +22,6 @@ const swconf = {
       {% endfor %}
     ],
 
-    {%- comment -%} The request url with below domain will be cached. {%- endcomment -%}
-    allowHosts: [
-      {% if site.cdn and site.cdn contains '//' %}
-        '{{ site.cdn | split: '//' | last | split: '/' | first }}',
-      {% endif %}
-
-      {%- unless site.assets.self_host.enabled -%}
-       {% for cdn in site.data.origin["cors"].cdns %}
-          '{{ cdn.url | split: "//" | last }}'
-          {%- unless forloop.last -%},{%- endunless -%}
-        {% endfor %}
-      {% endunless %}
-    ],
-
     {%- comment -%} The request url with below path will not be cached. {%- endcomment -%}
     denyPaths: [
       {% for path in site.pwa.cache.deny_paths %}

assets/js/pwa/sw.js

@@ -9,21 +9,7 @@ const swconfUrl = '{{ '/assets/js/data/swconf.js' | relative_url }}';
 importScripts(swconfUrl);
 const purge = swconf.purge;
 
-function verifyHost(url) {
-  for (const host of swconf.allowHosts) {
-    const regex = RegExp(`^http(s)?://${host}/`);
-    if (regex.test(url)) {
-      return true;
-    }
-  }
-  return false;
-}
-
 function verifyUrl(url) {
-  if (!verifyHost(url)) {
-    return false;
-  }
-
   const requestPath = new URL(url).pathname;
 
   for (const path of swconf.denyPaths) {
@@ -34,10 +20,6 @@ function verifyUrl(url) {
   return true;
 }
 
-if (!purge) {
-  swconf.allowHosts.push(location.host);
-}
-
 self.addEventListener('install', (event) => {
   if (purge) {
     return;