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

.gitignore

@@ -18,4 +18,6 @@ package-lock.json
 .idea
 
 # Misc
+*.map
+sw.min.js
 assets/js/dist

_config.yml

@@ -111,7 +111,14 @@ assets:
     env: # [development | production]
 
 pwa:
-  enabled: true # the option for PWA feature
+  enabled: true # the option for PWA feature (installable)
+  cache:
+    enabled: true # the option for PWA offline cache
+    # Paths defined here will be excluded from the PWA cache.
+    # Usually its value is the `baseurl` of another website that
+    # shares the same domain name as the current website.
+    deny_paths:
+      # - "/example"  # URLs match `<SITE_URL>/example/*` will not be cached by the PWA
 
 paginate: 10
 
@@ -157,10 +164,6 @@ defaults:
     values:
       layout: page
       permalink: /:title/
-  - scope:
-      path: assets/img/favicons
-    values:
-      swcache: true
   - scope:
       path: assets/js/dist
     values:

_data/origin/cors.yml

@@ -8,6 +8,8 @@ cdns:
   - url: https://fonts.googleapis.com
   # jsDelivr CDN
   - url: https://cdn.jsdelivr.net
+  # polyfill.io for math
+  - url: https://polyfill.io
 
 # fonts
 

_includes/favicons.html

@@ -8,7 +8,9 @@
 <link rel="apple-touch-icon" sizes="180x180" href="{{ favicon_path }}/apple-touch-icon.png">
 <link rel="icon" type="image/png" sizes="32x32" href="{{ favicon_path }}/favicon-32x32.png">
 <link rel="icon" type="image/png" sizes="16x16" href="{{ favicon_path }}/favicon-16x16.png">
+{% if site.pwa.enabled %}
   <link rel="manifest" href="{{ favicon_path }}/site.webmanifest">
+{% endif %}
 <link rel="shortcut icon" href="{{ favicon_path }}/favicon.ico">
 <meta name="apple-mobile-web-app-title" content="{{ site.title }}">
 <meta name="application-name" content="{{ site.title }}">

_includes/head.html

@@ -45,6 +45,15 @@
 
   {{ seo_tags }}
 
+  <!-- PWA cache settings -->
+  <meta
+    name="pwa-cache"
+    content="{{ site.pwa.cache.enabled | default: 'false' }}"
+    {%- if site.baseurl and site.baseurl != empty -%}
+      data-baseurl="{{ site.baseurl }}"
+    {%- endif -%}
+  >
+
   <title>
     {%- unless page.layout == 'home' -%}
       {{ page.title | append: ' | ' }}

_includes/js-selector.html

@@ -11,6 +11,8 @@
 
 <!-- layout specified -->
 
+{% assign js_dist = '/assets/js/dist/' %}
+
 {% if page.layout == 'post' or page.layout == 'page' or page.layout == 'home' %}
   {% assign urls = urls | append: ',' | append: site.data.origin[type]['lazy-polyfill'].js %}
 
@@ -65,7 +67,7 @@
     {% assign js = 'commons' %}
 {% endcase %}
 
-{% capture script %}/assets/js/dist/{{ js }}.min.js{% endcapture %}
+{% capture script %}{{ js_dist }}{{ js }}.min.js{% endcapture %}
 <script defer src="{{ script | relative_url }}"></script>
 
 {% if page.math %}
@@ -94,9 +96,7 @@
 {% if jekyll.environment == 'production' %}
   <!-- PWA -->
   {% if site.pwa.enabled %}
-    <script defer src="{{ '/app.js' | relative_url }}"></script>
-  {% else %}
-    <script defer src="{{ '/unregister.js' | relative_url }}"></script>
+    <script defer src="{{ 'app.min.js' | prepend: js_dist | relative_url }}"></script>
   {% endif %}
 
   <!-- GA -->

_javascript/pwa/app.js

@@ -0,0 +1,58 @@
+/* PWA loader */
+
+if ('serviceWorker' in navigator) {
+  const meta = document.querySelector('meta[name="pwa-cache"]');
+  const isEnabled = meta.content === 'true';
+
+  if (isEnabled) {
+    let swUrl = '/sw.min.js';
+    const baseUrl = meta.getAttribute('data-baseurl');
+
+    if (baseUrl !== null) {
+      swUrl = `${baseUrl}${swUrl}?baseurl=${encodeURIComponent(baseUrl)}`;
+    }
+
+    const $notification = $('#notification');
+    const $btnRefresh = $('#notification .toast-body>button');
+
+    navigator.serviceWorker.register(swUrl).then((registration) => {
+      // In case the user ignores the notification
+      if (registration.waiting) {
+        $notification.toast('show');
+      }
+
+      registration.addEventListener('updatefound', () => {
+        registration.installing.addEventListener('statechange', () => {
+          if (registration.waiting) {
+            if (navigator.serviceWorker.controller) {
+              $notification.toast('show');
+            }
+          }
+        });
+      });
+
+      $btnRefresh.on('click', () => {
+        if (registration.waiting) {
+          registration.waiting.postMessage('SKIP_WAITING');
+        }
+        $notification.toast('hide');
+      });
+    });
+
+    let refreshing = false;
+
+    // Detect controller change and refresh all the opened tabs
+    navigator.serviceWorker.addEventListener('controllerchange', () => {
+      if (!refreshing) {
+        window.location.reload();
+        refreshing = true;
+      }
+    });
+  } else {
+    navigator.serviceWorker.getRegistrations().then(function (registrations) {
+      for (let registration of registrations) {
+        registration.unregister();
+      }
+    });
+  }
+}

_javascript/pwa/sw.js

@@ -0,0 +1,101 @@
+/* PWA service worker */
+
+const swconfPath = '/assets/js/data/swconf.js';
+const params = new URL(location).searchParams;
+const swconfUrl = params.has('baseurl')
+  ? `${params.get('baseurl')}${swconfPath}`
+  : swconfPath;
+
+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) {
+    if (requestPath.startsWith(path)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+if (!purge) {
+  swconf.allowHosts.push(location.host);
+}
+
+self.addEventListener('install', (event) => {
+  if (purge) {
+    return;
+  }
+
+  event.waitUntil(
+    caches.open(swconf.cacheName).then((cache) => {
+      return cache.addAll(swconf.resources);
+    })
+  );
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((keyList) => {
+      return Promise.all(
+        keyList.map((key) => {
+          if (purge) {
+            return caches.delete(key);
+          } else {
+            if (key !== swconf.cacheName) {
+              return caches.delete(key);
+            }
+          }
+        })
+      );
+    })
+  );
+});
+
+self.addEventListener('message', (event) => {
+  if (event.data === 'SKIP_WAITING') {
+    self.skipWaiting();
+  }
+});
+
+self.addEventListener('fetch', (event) => {
+  event.respondWith(
+    caches.match(event.request).then((response) => {
+      if (response) {
+        return response;
+      }
+
+      return fetch(event.request).then((response) => {
+        const url = event.request.url;
+
+        if (purge || event.request.method !== 'GET' || !verifyUrl(url)) {
+          return response;
+        }
+
+        // See : <https://developers.google.com/web/fundamentals/primers/service-workers#cache_and_return_requests>
+        let responseToCache = response.clone();
+
+        caches.open(swconf.cacheName).then((cache) => {
+          cache.put(event.request, responseToCache);
+        });
+        return response;
+      });
+    })
+  );
+});

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 %}
+};

assets/js/pwa/app.js

@@ -1,47 +0,0 @@
----
-layout: compress
-permalink: '/app.js'
----
-
-const $notification = $('#notification');
-const $btnRefresh = $('#notification .toast-body>button');
-
-if ('serviceWorker' in navigator) {
-    /* Registering Service Worker */
-    navigator.serviceWorker.register('{{ "/sw.js" | relative_url }}')
-        .then(registration => {
-
-            /* in case the user ignores the notification */
-            if (registration.waiting) {
-                $notification.toast('show');
-            }
-
-            registration.addEventListener('updatefound', () => {
-                registration.installing.addEventListener('statechange', () => {
-                    if (registration.waiting) {
-                        if (navigator.serviceWorker.controller) {
-                            $notification.toast('show');
-                        }
-                    }
-                });
-            });
-
-            $btnRefresh.click(() => {
-                if (registration.waiting) {
-                    registration.waiting.postMessage('SKIP_WAITING');
-                }
-                $notification.toast('hide');
-            });
-        });
-
-    let refreshing = false;
-
-    /* Detect controller change and refresh all the opened tabs */
-    navigator.serviceWorker.addEventListener('controllerchange', () => {
-        if (!refreshing) {
-            window.location.reload();
-            refreshing = true;
-        }
-    });
-}
-

assets/js/pwa/sw.js

@@ -1,89 +0,0 @@
----
-layout: compress
-permalink: '/sw.js'
-# PWA service worker
----
-
-self.importScripts('{{ "/assets/js/data/swcache.js" | relative_url }}');
-
-const cacheName = 'chirpy-{{ "now" | date: "%s" }}';
-
-function verifyDomain(url) {
-  for (const domain of allowedDomains) {
-    const regex = RegExp(`^http(s)?:\/\/${domain}\/`);
-    if (regex.test(url)) {
-      return true;
-    }
-  }
-
-  return false;
-}
-
-function isExcluded(url) {
-  for (const item of denyUrls) {
-    if (url === item) {
-      return true;
-    }
-  }
-  return false;
-}
-
-self.addEventListener('install', (event) => {
-  event.waitUntil(
-    caches.open(cacheName).then((cache) => {
-      return cache.addAll(resource);
-    })
-  );
-});
-
-self.addEventListener('activate', (event) => {
-  event.waitUntil(
-    caches.keys().then((keyList) => {
-      return Promise.all(
-        keyList.map((key) => {
-          if (key !== cacheName) {
-            return caches.delete(key);
-          }
-        })
-      );
-    })
-  );
-});
-
-self.addEventListener('message', (event) => {
-  if (event.data === 'SKIP_WAITING') {
-    self.skipWaiting();
-  }
-});
-
-self.addEventListener('fetch', (event) => {
-  event.respondWith(
-    caches.match(event.request).then((response) => {
-      if (response) {
-        return response;
-      }
-
-      return fetch(event.request).then((response) => {
-        const url = event.request.url;
-
-        if (
-          event.request.method !== 'GET' ||
-          !verifyDomain(url) ||
-          isExcluded(url)
-        ) {
-          return response;
-        }
-
-        /* see: <https://developers.google.com/web/fundamentals/primers/service-workers#cache_and_return_requests> */
-        let responseToCache = response.clone();
-
-        caches.open(cacheName).then((cache) => {
-          /* console.log('[sw] Caching new resource: ' + event.request.url); */
-          cache.put(event.request, responseToCache);
-        });
-
-        return response;
-      });
-    })
-  );
-});

assets/js/pwa/unregister.js

@@ -1,12 +0,0 @@
----
-layout: compress
-permalink: '/unregister.js'
----
-
-if ('serviceWorker' in navigator) {
-    navigator.serviceWorker.getRegistrations().then((registrations) => {
-        for (let reg of registrations) {
-            reg.unregister();
-        }
-    });
-}

jekyll-theme-chirpy.gemspec

@@ -11,7 +11,7 @@ Gem::Specification.new do |spec|
   spec.license       = "MIT"
 
   spec.files         = `git ls-files -z`.split("\x0").select { |f|
-    f.match(%r!^((_(includes|layouts|sass|(data\/(locales|origin)))|assets)\/|README|LICENSE)!i)
+    f.match(%r!^((_(includes|layouts|sass|(data\/(locales|origin)))|assets)\/|sw|README|LICENSE)!i)
   }
 
   spec.metadata = {

package.json

@@ -13,9 +13,9 @@
   },
   "homepage": "https://github.com/cotes2020/jekyll-theme-chirpy/",
   "scripts": {
-    "prebuild": "npx rimraf assets/js/dist",
+    "prebuild": "npx rimraf assets/js/dist sw.min.js*",
     "build": "NODE_ENV=production npx rollup -c --bundleConfigAsCjs",
-    "prewatch": "npx rimraf assets/js/dist",
+    "prewatch": "npx rimraf assets/js/dist sw.min.js*",
     "watch": "npx rollup -c --bundleConfigAsCjs -w",
     "test": "npx stylelint _sass/**/*.scss",
     "fixlint": "npm run test -- --fix"

rollup.config.js

@@ -3,21 +3,29 @@ import terser from '@rollup/plugin-terser';
 import license from 'rollup-plugin-license';
 import path from 'path';
 
-const JS_SRC = '_javascript';
-const JS_DIST = 'assets/js/dist';
+const SRC_DEFAULT = '_javascript';
+const DIST_DEFAULT = 'assets/js/dist';
 const isProd = process.env.NODE_ENV === 'production';
 
-function build(filename) {
+function build(filename, opts) {
+  let src = SRC_DEFAULT;
+  let dist = DIST_DEFAULT;
+
+  if (typeof opts !== 'undefined') {
+    src = opts.src || src;
+    dist = opts.dist || dist;
+  }
+
   return {
-    input: [`${JS_SRC}/${filename}.js`],
+    input: [`${src}/${filename}.js`],
     output: {
-      file: `${JS_DIST}/${filename}.min.js`,
+      file: `${dist}/${filename}.min.js`,
       format: 'iife',
       name: 'Chirpy',
       sourcemap: !isProd
     },
     watch: {
-      include: `${JS_SRC}/**`
+      include: `${src}/**`
     },
     plugins: [
       babel({
@@ -28,7 +36,7 @@ function build(filename) {
       license({
         banner: {
           commentStyle: 'ignored',
-          content: { file: path.join(__dirname, JS_SRC, '_copyright') }
+          content: { file: path.join(__dirname, SRC_DEFAULT, '_copyright') }
         }
       }),
       isProd && terser()
@@ -42,5 +50,7 @@ export default [
   build('categories'),
   build('page'),
   build('post'),
-  build('misc')
+  build('misc'),
+  build('app', { src: `${SRC_DEFAULT}/pwa` }),
+  build('sw', { src: `${SRC_DEFAULT}/pwa`, dist: '.' })
 ];

tools/init

@@ -103,7 +103,7 @@ init_files() {
   npm i && npm run build
 
   # track the js output
-  _sedi "/^assets.*\/dist/d" .gitignore
+  _sedi "/^assets.*\/dist/d;/^sw.*\.js/d" .gitignore
 }
 
 commit() {

tools/release

@@ -27,6 +27,7 @@ NODE_CONFIG="package.json"
 CHANGE_LOG="docs/CHANGELOG.md"
 
 JS_DIST="assets/js/dist"
+PWA_SW="sw.min.js"
 BACKUP_PATH="$(mktemp -d)"
 
 FILES=(
@@ -70,12 +71,14 @@ _check_git() {
     exit 1
   fi
 
+  $opt_pre || (
     if [[ $working_branch != "$DEFAULT_BRANCH" &&
       $working_branch != hotfix/* &&
       $working_branch != "$PROD_BRANCH" ]]; then
       echo "> Abort: Please run on the default, release or patch branch."
       exit 1
     fi
+  )
 }
 
 _check_src() {
@@ -156,7 +159,7 @@ build_gem() {
   rm -f ./*.gem
 
   npm run build
-  git add "$JS_DIST" -f # add JS dist to gem
+  git add "$JS_DIST" "$PWA_SW" -f # add JS distribution files to gem
   gem build "$GEM_SPEC"
   cp "$JS_DIST"/* "$BACKUP_PATH"