views: A view to dismiss notifications

Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/urls.py

@@ -17,12 +17,12 @@
 """
 Django URLconf file containing all urls
 """
-from django.conf.urls import url
-
 from captcha import views as cviews
-from plinth.modules.sso.views import CaptchaLoginView
+from django.conf.urls import url
 from stronghold.decorators import public
 
+from plinth.modules.sso.views import CaptchaLoginView
+
 from . import views
 
 urlpatterns = [
@@ -45,4 +45,8 @@ urlpatterns = [
 
     # locked url from django-axes
     url(r'locked/$', public(CaptchaLoginView.as_view()), name='locked_out'),
+
+    # Notifications
+    url(r'^notification/(?P<id>[a-z0-9-]+)/dismiss/$',
+        views.notification_dismiss, name='notification_dismiss')
 ]

plinth/views.py

@@ -22,6 +22,7 @@ import time
 
 from django.contrib import messages
 from django.core.exceptions import ImproperlyConfigured
+from django.http import Http404, HttpResponseRedirect
 from django.template.response import TemplateResponse
 from django.urls import reverse
 from django.utils.http import is_safe_url
@@ -41,6 +42,16 @@ from . import forms, frontpage
 REDIRECT_FIELD_NAME = 'next'
 
 
+def _get_redirect_url_from_param(request):
+    """Return the redirect URL from 'next' GET/POST param."""
+    redirect_to = request.GET.get(REDIRECT_FIELD_NAME, '')
+    redirect_to = request.POST.get(REDIRECT_FIELD_NAME, redirect_to)
+    if is_safe_url(url=redirect_to, allowed_hosts={request.get_host()}):
+        return redirect_to
+
+    return reverse('index')
+
+
 @public
 def index(request):
     """Serve the main index page."""
@@ -100,13 +111,7 @@ class LanguageSelectionView(FormView):
 
     def get_success_url(self):
         """Return the URL in the next parameter or home page."""
-        redirect_to = self.request.GET.get(REDIRECT_FIELD_NAME, '')
-        redirect_to = self.request.POST.get(REDIRECT_FIELD_NAME, redirect_to)
-        if is_safe_url(url=redirect_to,
-                       allowed_hosts={self.request.get_host()}):
-            return redirect_to
-
-        return reverse('index')
+        return _get_redirect_url_from_param(self.request)
 
 
 class AppView(FormView):
@@ -254,3 +259,15 @@ class SetupView(TemplateView):
                 return self.render_to_response(self.get_context_data())
 
         return super(SetupView, self).dispatch(request, *args, **kwargs)
+
+
+def notification_dismiss(request, id):
+    """Dismiss a notification."""
+    from .notification import Notification
+    notes = Notification.list(key=id, user=request.user)
+    if not notes:
+        raise Http404
+
+    notes[0].dismiss()
+
+    return HttpResponseRedirect(_get_redirect_url_from_param(request))