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added basic service worker

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This commit is contained in:
vabene1111
2021-01-10 12:00:16 +01:00
parent db6fe4256f
commit e50239f067
5 changed files with 140 additions and 1 deletions
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15
cookbook/templates/base.html
View File

@ -49,7 +49,8 @@
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-{% nav_color request %}" id="id_main_nav" style="{% sticky_nav request %}">
<nav class="navbar navbar-expand-lg navbar-dark bg-{% nav_color request %}" id="id_main_nav"
style="{% sticky_nav request %}">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarText"
aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
@ -211,5 +212,17 @@
{% block script %}
{% endblock script %}
<script type="application/javascript">
window.addEventListener("load", () => {
if ("serviceWorker" in navigator) {
navigator.serviceWorker.register("{% url 'service_worker' %}", { scope: '/' }).then(function (reg) {
console.log('Successfully registered service worker', reg);
}).catch(function (err) {
console.warn('Error whilst registering service worker', err);
});
}
});
</script>
</body>
</html>

31
cookbook/templates/offline.html Normal file
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@ -0,0 +1,31 @@
{% extends "base.html" %}
{% load static %}
{% load i18n %}
{% block title %}{% trans "Offline" %}{% endblock %}
{% block extra_head %}
{% endblock %}
{% block content %}
<div style="text-align: center">
<h1 class="">Offline</h1>
<br/>
<span>{% trans 'You are currently offline!' %}</span>
<span>{% trans 'This app does not (yet) support offline functionality. Please make sure to re-establish a network connection.' %}</span>
<br/>
<br/>
<i class="fas fa-search fa-8x"></i>
<br/>
<br/>
<br/>
<br/>
</div>
{% endblock %}

88
cookbook/templates/service-worker.js Normal file
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@ -0,0 +1,88 @@
/*
Copyright 2015, 2019, 2020 Google LLC. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Incrementing OFFLINE_VERSION will kick off the install event and force
// previously cached resources to be updated from the network.
const OFFLINE_VERSION = 1;
const CACHE_NAME = "offline";
// Customize this with a different URL if needed.
const OFFLINE_URL = "/offline/";
self.addEventListener("install", (event) => {
event.waitUntil(
(async () => {
const cache = await caches.open(CACHE_NAME);
// Setting {cache: 'reload'} in the new request will ensure that the
// response isn't fulfilled from the HTTP cache; i.e., it will be from
// the network.
await cache.add(new Request(OFFLINE_URL, {cache: "reload"}));
})()
);
// Force the waiting service worker to become the active service worker.
self.skipWaiting();
});
self.addEventListener("activate", (event) => {
event.waitUntil(
(async () => {
// Enable navigation preload if it's supported.
// See https://developers.google.com/web/updates/2017/02/navigation-preload
if ("navigationPreload" in self.registration) {
await self.registration.navigationPreload.enable();
}
})()
);
// Tell the active service worker to take control of the page immediately.
self.clients.claim();
});
self.addEventListener("fetch", (event) => {
// We only want to call event.respondWith() if this is a navigation request
// for an HTML page.
console.log("fetch event called");
if (event.request.mode === "navigate") {
event.respondWith(
(async () => {
try {
// First, try to use the navigation preload response if it's supported.
const preloadResponse = await event.preloadResponse;
if (preloadResponse) {
return preloadResponse;
}
// Always try the network first.
console.log("Served from network");
const networkResponse = await fetch(event.request);
return networkResponse;
} catch (error) {
// catch is only triggered if an exception is thrown, which is likely
// due to a network error.
// If fetch() returns a valid HTTP response with a response code in
// the 4xx or 5xx range, the catch() will NOT be called.
console.log("Fetch failed; returning offline page instead.", error);
const cache = await caches.open(CACHE_NAME);
const cachedResponse = await cache.match(OFFLINE_URL);
return cachedResponse;
}
})()
);
}
// If our if() condition is false, then this fetch handler won't intercept the
// request. If there are any other fetch handlers registered, they will get a
// chance to call event.respondWith(). If no fetch handlers call
// event.respondWith(), the request will be handled by the browser as if there
// were no service worker involvement.
});

3
cookbook/urls.py
View File

@ -1,6 +1,7 @@
from pydoc import locate
from django.urls import path, include
from django.views.generic import TemplateView
from rest_framework import routers
from rest_framework.schemas import get_schema_view
@ -41,6 +42,8 @@ urlpatterns = [
path('shopping/<int:pk>', views.shopping_list, name='view_shopping'),
path('settings/', views.user_settings, name='view_settings'),
path('history/', views.history, name='view_history'),
path('offline/', views.offline, name='view_offline'),
path('service-worker.js', (TemplateView.as_view(template_name="service-worker.js", content_type='application/javascript', )), name='service_worker'),
path('test/', views.test, name='view_test'),
path('import/', import_export.import_recipe, name='view_import'),

4
cookbook/views/views.py
View File

@ -359,6 +359,10 @@ def api_info(request):
return render(request, 'api_info.html', {})
def offline(request):
return render(request, 'offline.html', {})
def test(request):
if not settings.DEBUG:
return HttpResponseRedirect(reverse('index'))