Restored support to oldest Django versions

pwa/app_settings.py

@@ -3,8 +3,9 @@ from django.conf import settings
 import os
 
 # Path to the service worker implementation.  Default implementation is empty.
-PWA_SERVICE_WORKER_PATH = getattr(settings, 'PWA_SERVICE_WORKER_PATH', 'serviceworker.js')
-
+PWA_SERVICE_WORKER_PATH = getattr(settings, 'PWA_SERVICE_WORKER_PATH',
+                                  os.path.join(os.path.abspath(os.path.dirname(__file__)), 'templates',
+                                               'serviceworker.js'))
 # App parameters to include in manifest.json and appropriate meta tags
 PWA_APP_NAME = getattr(settings, 'PWA_APP_NAME', 'MyApp')
 PWA_APP_DESCRIPTION = getattr(settings, 'PWA_APP_DESCRIPTION', 'My Progressive Web App')

pwa/urls.py

@@ -1,10 +1,10 @@
-from django.urls import path
+from django.conf.urls import url
 
-from .views import Manifest, ServiceWorker, OfflineView
+from .views import manifest, service_worker, offline
 
 # Serve up serviceworker.js and manifest.json at the root
 urlpatterns = [
-    path('serviceworker.js', ServiceWorker.as_view(), name='serviceworker'),
-    path('manifest.json', Manifest.as_view(), name='manifest'),
-    path('offline', OfflineView.as_view(), name='offline')
+    url('^serviceworker.js$', service_worker, name='serviceworker'),
+    url('^manifest.json$', manifest, name='manifest'),
+    url('^offline/$', offline, name='offline')
 ]

pwa/views.py

@@ -1,27 +1,21 @@
-from django.views.generic.base import TemplateView
+from django.http import HttpResponse
+from django.shortcuts import render
 
 from . import app_settings
 
 
-class ServiceWorker(TemplateView):
-    content_type = 'application/javascript'
-    template_name = app_settings.PWA_SERVICE_WORKER_PATH
-    
-    def get_context_data(self, **kwargs):
-        kwargs['PWA_APP_FETCH_URL'] = app_settings.PWA_APP_FETCH_URL
-        return super().get_context_data(**kwargs)
+def service_worker(request):
+    response = HttpResponse(open(app_settings.PWA_SERVICE_WORKER_PATH).read(), content_type='application/javascript')
+    return response
 
 
-class Manifest(TemplateView):
-    content_type = 'application/json'
-    template_name = 'manifest.json'
-    
-    def get_context_data(self, **kwargs):
-        for setting_name in dir(app_settings):
-            if setting_name.startswith('PWA_'):
-                kwargs[setting_name] = getattr(app_settings, setting_name)
-        return super().get_context_data(**kwargs)
+def manifest(request):
+    return render(request, 'manifest.json', {
+        setting_name: getattr(app_settings, setting_name)
+        for setting_name in dir(app_settings)
+        if setting_name.startswith('PWA_')
+    })
 
 
-class OfflineView(TemplateView):
-    template_name = "offline.html"
+def offline(request):
+    return render(request, "offline.html")