feat(PWA): add Service Worker update notification

_data/locales/en.yml

@@ -45,6 +45,10 @@ meta: Powered by :PLATFORM with :THEME theme.
 not_found:
   statment: Sorry, we've misplaced that URL or it's pointing to something that doesn't exist.
 
+notification:
+  update_found: A new version of content is available.
+  update: Update
+
 # ----- Posts related labels -----
 
 post:

_data/locales/es-ES.yml

@@ -45,6 +45,10 @@ meta: Hecho con :PLATFORM usando el tema :THEME.
 not_found:
   statment: Lo sentimos, hemos perdido esa URL o apunta a algo que no existe.
 
+notification:
+  update_found: Hay una nueva versión de contenido disponible.
+  update: Actualizar
+
 # ----- Posts related labels -----
 
 post:

_data/locales/fr-FR.yml

@@ -45,6 +45,10 @@ meta: Propulsé par :PLATFORM avec le thème :THEME
 not_found:
   statment: Désolé, nous avons égaré cette URL ou elle pointe vers quelque chose qui n'existe pas.
 
+notification:
+  update_found: Une nouvelle version du contenu est disponible.
+  update: Mise à jour
+
 # ----- Posts related labels -----
 
 post:

_data/locales/id-ID.yml

@@ -45,6 +45,10 @@ meta: Didukung oleh :PLATFORM dengan tema :THEME.
 not_found:
   statment: Maaf, kami gagal menemukan URL itu atau memang mengarah ke sesuatu yang tidak ada.
 
+notification:
+  update_found: Versi konten baru tersedia.
+  update: Perbarui
+
 # ----- Posts related labels -----
 
 post:

_data/locales/ko-KR.yml

@@ -45,6 +45,10 @@ meta: Powered by :PLATFORM with :THEME theme.
 not_found:
   statment: 해당 URL은 존재하지 않습니다.
 
+notification:
+  update_found: 새 버전의 콘텐츠를 사용할 수 있습니다.
+  update: 업데이트
+
 # ----- Posts related labels -----
 
 post:

_data/locales/my-MM.yml

@@ -45,6 +45,10 @@ meta: Powered by :PLATFORM with :THEME theme.
 not_found:
   statment: ဝမ်းနည်းပါသည်၊ ကျွန်ုပ်တို့သည် အဆိုပါ URL ကို မှားယွင်းစွာ နေရာချထားခြင်း သို့မဟုတ် ၎င်းသည် မရှိသောအရာကို ညွှန်ပြနေပါသည်။
 
+notification:
+  update_found: အကြောင်းအရာဗားရှင်းအသစ်ကို ရနိုင်ပါပြီ။
+  update: အပ်ဒိတ်
+
 # ----- Posts related labels -----
 
 post:

_data/locales/pt-BR.yml

@@ -45,6 +45,10 @@ meta: Feito com :PLATFORM usando o tema :THEME.
 not_found:
   statment: Desculpe, a página não foi encontrada.
 
+notification:
+  update_found: Uma nova versão do conteúdo está disponível.
+  update: atualização
+
 # ----- Posts related labels -----
 
 post:

_data/locales/ru-RU.yml

@@ -45,6 +45,10 @@ meta: Powered by :PLATFORM with :THEME theme.
 not_found:
   statment: Извините, эта ссылка указывает на ресурс который не существует.
 
+notification:
+  update_found: Доступна новая версия контента.
+  update: Обновлять
+
 # ----- Posts related labels -----
 
 post:

_data/locales/uk-UA.yml

@@ -45,6 +45,10 @@ meta: Powered by :PLATFORM with :THEME theme.
 not_found:
   statment: Вибачте, це посилання вказує на ресурс, що не існує.
 
+notification:
+  update_found: Доступна нова версія вмісту.
+  update: Оновлення
+
 # ----- Posts related labels -----
 
 post:

_data/locales/vi-VN.yml

@@ -43,6 +43,10 @@ meta: Trang web này được tạo bởi :PLATFORM với chủ đề :THEME.
 not_found:
   statment: Xin lỗi, chúng tôi đã đặt nhầm URL hoặc đường dẫn trỏ đến một trang nào đó không tồn tại.
 
+notification:
+  update_found: Đã có phiên bản mới của nội dung.
+  update: Cập nhật
+
 # ----- Posts related labels -----
 
 post:

_data/locales/zh-CN.yml

@@ -44,6 +44,10 @@ meta: 本站由 :PLATFORM 生成，采用 :THEME 主题。
 not_found:
   statment: 抱歉，我们放错了该 URL，或者它指向了不存在的内容。
 
+notification:
+  update_found: 发现新版本的内容。
+  update: 更新
+
 # ----- Posts related labels -----
 
 post:

_layouts/default.html

@@ -48,6 +48,21 @@ layout: compress
       <i class="fas fa-angle-up"></i>
     </a>
 
+    <div id="notification" class="toast" role="alert" aria-live="assertive" aria-atomic="true"
+      data-animation="true" data-autohide="false">
+      <div class="toast-header">
+        <button type="button" class="ml-2 ml-auto close" data-dismiss="toast" aria-label="Close">
+          <span aria-hidden="true">&times;</span>
+        </button>
+      </div>
+      <div class="toast-body text-center pt-0">
+        <p class="pl-2 pr-2 mb-3">{{ site.data.locales[lang].notification.update_found }}</p>
+        <button type="button" class="btn btn-primary" aria-label="Update">
+          {{ site.data.locales[lang].notification.update }}
+        </button>
+      </div>
+    </div>
+
     {% include search-loader.html %}
 
     {% include js-selector.html %}

_sass/addon/commons.scss

@@ -1150,6 +1150,51 @@ $sidebar-display: "sidebar-display";
   -webkit-transform: translate3d(0, -5px, 0);
 }
 
+#notification {
+  @keyframes popup {
+    from {
+      opacity: 0;
+      bottom: 0;
+    }
+  }
+
+  .toast-header {
+    background: none;
+    border-bottom: none;
+    color: inherit;
+  }
+
+  .toast-body {
+    font-family: 'Lato';
+    line-height: 1.25rem;
+
+    button {
+      font-size: 90%;
+      min-width: 4rem;
+    }
+  }
+
+  &.toast {
+    display: none;
+
+    &.show {
+      display: block;
+      min-width: 20rem;
+      border-radius: 0.5rem;
+      -webkit-backdrop-filter: blur(10px);
+      backdrop-filter: blur(10px);
+      background-color: rgba(255, 255, 255, 0.5);
+      color: #1b1b1eba;
+      position: fixed;
+      left: 50%;
+      bottom: 20%;
+      transform: translateX(-50%);
+      animation: popup 0.8s;
+    }
+  }
+
+}
+
 /*
   Responsive Design:
 

assets/js/pwa/app.js

@@ -3,7 +3,56 @@ layout: compress
 permalink: '/app.js'
 ---
 
-/* Registering Service Worker */
-if('serviceWorker' in navigator) {
-  navigator.serviceWorker.register('{{ "/sw.js" | relative_url }}');
-};
+const keyWaiting = 'sw-waiting';
+const $notification = $('#notification');
+const $btnRefresh = $('#notification .toast-body>button');
+
+function skipWating(registration) {
+  registration.waiting.postMessage('SKIP_WAITING');
+  localStorage.removeItem(keyWaiting);
+}
+
+if ('serviceWorker' in navigator) {
+  /* Registering Service Worker */
+  navigator.serviceWorker.register('{{ "/sw.js" | relative_url }}')
+    .then(registration => {
+      if (registration) {
+        registration.addEventListener('updatefound', () => {
+          /* console.log('updatefound'); */
+          let serviceWorker = registration.installing;
+
+          serviceWorker.addEventListener('statechange', () => {
+            /* console.log(`statechange -> ${serviceWorker.state}`); */
+            if (serviceWorker.state === 'installed') {
+              /* console.log('installed'); */
+              if (navigator.serviceWorker.controller) {
+                $notification.toast('show');
+                /* in case the user ignores the notification */
+                localStorage.setItem(keyWaiting, true);
+              }
+            }
+          });
+        });
+
+        $btnRefresh.click(() => {
+          skipWating(registration);
+          $notification.toast('hide');
+        });
+
+        /* there's a new Service Worker waiting to be activated */
+        if (localStorage.getItem(keyWaiting)) {
+          $notification.toast('show');
+        }
+      }
+    });
+
+  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

@@ -6,7 +6,7 @@ permalink: '/sw.js'
 
 self.importScripts('{{ "/assets/js/data/swcache.js" | relative_url }}');
 
-const cacheName = 'chirpy-{{ "now" | date: "%Y%m%d.%H%M" }}';
+const cacheName = 'chirpy-{{ "now" | date: "%Y%m%d.%H%M%S" }}';
 
 function verifyDomain(url) {
   for (const domain of allowedDomains) {
@@ -28,60 +28,62 @@ function isExcluded(url) {
   return false;
 }
 
-self.addEventListener('install', e => {
-  self.skipWaiting();
-  e.waitUntil(
+self.addEventListener('install', event => {
+  event.waitUntil(
     caches.open(cacheName).then(cache => {
       return cache.addAll(resource);
     })
   );
 });
 
-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;
-          });
-      })
-    );
-});
-
-self.addEventListener('activate', e => {
-  e.waitUntil(
+self.addEventListener('activate', event => {
+  event.waitUntil(
     caches.keys().then(keyList => {
-          return Promise.all(
-            keyList.map(key => {
-              if(key !== cacheName) {
-                return caches.delete(key);
-              }
-            })
-          );
+      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;
+      });
     })
   );
 });