Included the default serviceworker, updated the manifest, Add the default offline page, updated the unit test, Redme

pwa/views.py

@@ -1,17 +1,27 @@
-from django.http import HttpResponse
-from django.shortcuts import render
+from django.views.generic.base import TemplateView
 
 from . import app_settings
 
 
-def service_worker(request):
-    response = HttpResponse(open(app_settings.PWA_SERVICE_WORKER_PATH).read(), content_type='application/javascript')
-    return response
+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 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 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)
+
+
+class OfflineView(TemplateView):
+    template_name = "offline.html"