feat: add pwa.cache.* option to precisely control caching (#1501)

assets/js/data/swcache.js

@@ -1,49 +0,0 @@
----
-layout: compress
-# The list to be cached by PWA
----
-
-const resource = [
-  /* --- CSS --- */
-  '{{ "/assets/css/:THEME.css" | replace: ':THEME', site.theme | relative_url }}',
-
-  /* --- PWA --- */
-  '{{ "/app.js" | relative_url }}',
-  '{{ "/sw.js" | relative_url }}',
-
-  /* --- HTML --- */
-  '{{ "/index.html" | relative_url }}',
-  '{{ "/404.html" | relative_url }}',
-
-  {% for tab in site.tabs %}
-    '{{ tab.url | relative_url }}',
-  {% endfor %}
-
-  /* --- Favicons & compressed JS --- */
-  {% assign cache_list = site.static_files | where: 'swcache', true  %}
-  {% for file in cache_list %}
-    '{{ file.path | relative_url }}'{%- unless forloop.last -%},{%- endunless -%}
-  {% endfor %}
-];
-
-/* The request url with below domain will be cached */
-const allowedDomains = [
-  {% if site.google_analytics.id != empty and site.google_analytics.id %}
-    'www.googletagmanager.com',
-    'www.google-analytics.com',
-  {% endif %}
-
-  '{{ site.url | split: "//" | last }}',
-
-  {% if site.img_cdn contains '//' and site.img_cdn %}
-    '{{ site.img_cdn | split: '//' | last | split: '/' | first }}',
-  {% endif %}
-
-  'fonts.gstatic.com',
-  'fonts.googleapis.com',
-  'cdn.jsdelivr.net',
-  'polyfill.io'
-];
-
-/* Requests that include the following path will be banned */
-const denyUrls = [];

assets/js/data/swconf.js

@@ -0,0 +1,51 @@
+---
+layout: compress
+permalink: '/:path/swconf.js'
+# Note that this file will be fetched by the ServiceWorker, so it will not be cached.
+---
+
+const swconf = {
+  {% if site.pwa.cache.enabled %}
+    cacheName: 'chirpy-{{ "now" | date: "%s" }}',
+
+    {%- comment -%} Resources added to the cache during PWA installation. {%- endcomment -%}
+    resources: [
+      '{{ "/assets/css/:THEME.css" | replace: ':THEME', site.theme | relative_url }}',
+      '{{ "/" | relative_url }}',
+      {% for tab in site.tabs %}
+        '{{- tab.url | relative_url -}}',
+      {% endfor %}
+
+      {% assign cache_list = site.static_files | where: 'swcache', true %}
+      {% for file in cache_list %}
+        '{{ file.path | relative_url }}'{%- unless forloop.last -%},{%- endunless -%}
+      {% endfor %}
+    ],
+
+    {%- comment -%} The request url with below domain will be cached. {%- endcomment -%}
+    allowHosts: [
+      {% if site.img_cdn and site.img_cdn contains '//' %}
+        '{{ site.img_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 %}
+        {% unless path == empty %}
+          '{{ path | relative_url }}'{%- unless forloop.last -%},{%- endunless -%}
+        {% endunless  %}
+      {% endfor %}
+    ],
+    purge: false
+  {% else %}
+    purge: true
+  {% endif %}
+};