Add cache control headers with respect to Snippet expire time.

dpaste/apps.py

@@ -30,7 +30,7 @@ class dpasteAppConfig(AppConfig):
     EXTRA_POST_ABOUT = ""
 
     # HTML content injeted after the "New snippet" form
-    EXTRA_POST_NEW =""
+    EXTRA_POST_NEW = ""
 
     # HTML content injected at the end of every form
     EXTRA_POST_FORM = ""
@@ -613,6 +613,14 @@ class dpasteAppConfig(AppConfig):
             # ('zephir', 'Zephir')
         ]
 
+    # Whether to send out cache headers (Max-Age, Never-Cache, etc.).
+    CACHE_HEADER = True
+
+    # Defines how long pages are cached by upstream Proxies (Max-Age Header).
+    # This does not affect caching of snippets, their max-age limit is set
+    # to the expire date.
+    CACHE_TIMEOUT = 60 * 10
+
     @staticmethod
     def get_base_url(request=None):
         """

dpaste/management/commands/cleanup_snippets.py

@@ -1,9 +1,8 @@
 from datetime import timedelta
 
+from django.apps import apps
 from django.core.management.base import BaseCommand
 from django.utils import timezone
-from django.apps import apps
-
 
 from dpaste.models import Snippet
 

dpaste/settings/base.py

@@ -30,7 +30,7 @@ ALLOWED_HOSTS = env("ALLOWED_HOSTS", "*").split(",")
 TIME_ZONE = "UTC"
 USE_I18N = True
 USE_L10N = True
-USE_TZ = True
+USE_TZ = False
 
 LANGUAGE_CODE = "en"
 LANGUAGES = (("en", "English"),)

dpaste/settings/tests.py

@@ -2,6 +2,7 @@
 Settings for the testsuite runs.
 """
 import django
+
 from .base import *  # noqa
 
 SECRET_KEY = "test-key"

dpaste/urls/dpaste.py

@@ -1,6 +1,7 @@
 from django.apps import apps
 from django.conf import settings
 from django.conf.urls import url
+from django.views.decorators.cache import cache_control
 from django.views.decorators.clickjacking import xframe_options_exempt
 from django.views.generic import TemplateView
 
@@ -13,9 +14,11 @@ urlpatterns = [
     url(r"^$", views.SnippetView.as_view(), name="snippet_new"),
     url(
         r"^about/$",
-        TemplateView.as_view(
-            template_name="dpaste/about.html",
-            extra_context=config.extra_template_context,
+        cache_control(max_age=config.CACHE_TIMEOUT)(
+            TemplateView.as_view(
+                template_name="dpaste/about.html",
+                extra_context=config.extra_template_context,
+            )
         ),
         name="dpaste_about",
     ),

dpaste/views.py

@@ -1,6 +1,7 @@
 import datetime
 import difflib
 import json
+import time
 
 from django.apps import apps
 from django.http import (
@@ -10,12 +11,12 @@ from django.http import (
     HttpResponseForbidden,
     HttpResponseRedirect,
 )
-from django.shortcuts import get_object_or_404
+from django.shortcuts import get_object_or_404, render
 from django.urls import reverse
 from django.utils import timezone
+from django.utils.cache import add_never_cache_headers, patch_cache_control
+from django.utils.http import http_date
 from django.utils.translation import ugettext
-from django.views.defaults import page_not_found as django_page_not_found
-from django.views.defaults import server_error as django_server_error
 from django.views.generic import FormView
 from django.views.generic.base import TemplateView, View
 from django.views.generic.detail import DetailView
@@ -43,6 +44,12 @@ class SnippetView(FormView):
     form_class = SnippetForm
     template_name = "dpaste/new.html"
 
+    def get(self, request, *args, **kwargs):
+        response = super().get(request, *args, **kwargs)
+        if config.CACHE_HEADER:
+            patch_cache_control(response, max_age=config.CACHE_TIMEOUT)
+        return response
+
     def get_form_kwargs(self):
         kwargs = super(SnippetView, self).get_form_kwargs()
         kwargs.update({"request": self.request})
@@ -58,12 +65,13 @@ class SnippetView(FormView):
         return ctx
 
 
-class SnippetDetailView(SnippetView, DetailView):
+class SnippetDetailView(DetailView):
     """
     Details list view of a snippet. Handles the actual view, reply and
     tree/diff view.
     """
 
+    form_class = SnippetForm
     queryset = Snippet.objects.all()
     template_name = "dpaste/details.html"
     slug_url_kwarg = "snippet_id"
@@ -106,7 +114,18 @@ class SnippetDetailView(SnippetView, DetailView):
         snippet.view_count += 1
         snippet.save(update_fields=["view_count"])
 
-        return super(SnippetDetailView, self).get(request, *args, **kwargs)
+        response = super(SnippetDetailView, self).get(request, *args, **kwargs)
+
+        # Set the Max-Age header up until the snippet would expire
+        if config.CACHE_HEADER:
+            if snippet.expire_type == Snippet.EXPIRE_KEEP:
+                patch_cache_control(response, max_age=config.CACHE_TIMEOUT)
+            if snippet.expire_type == Snippet.EXPIRE_ONETIME:
+                add_never_cache_headers(response)
+            if snippet.expire_type == Snippet.EXPIRE_TIME and snippet.expires:
+                response["Expires"] = http_date(snippet.expires.timestamp())
+
+        return response
 
     def get_initial(self):
         snippet = self.get_object()
@@ -116,6 +135,11 @@ class SnippetDetailView(SnippetView, DetailView):
             "rtl": snippet.rtl,
         }
 
+    def get_form_kwargs(self):
+        kwargs = super().get_form_kwargs()
+        kwargs.update({"request": self.request})
+        return kwargs
+
     def form_valid(self, form):
         snippet = form.save(parent=self.get_object())
         return HttpResponseRedirect(snippet.get_absolute_url())
@@ -203,6 +227,11 @@ class SnippetHistory(TemplateView):
         snippet_id_list = self.request.session.get("snippet_list", [])
         return Snippet.objects.filter(pk__in=snippet_id_list)
 
+    def get(self, request, *args, **kwargs):
+        response = super().get(request, *args, **kwargs)
+        add_never_cache_headers(response)
+        return response
+
     def post(self, request, *args, **kwargs):
         """
         Delete all user snippets at once.
@@ -332,12 +361,17 @@ class APIView(View):
 
 
 def page_not_found(request, exception=None, template_name="dpaste/404.html"):
-    return django_page_not_found(
-        request, exception, template_name=template_name
-    )
+    context = {}
+    context.update(config.extra_template_context)
+    response = render(request, template_name, context, status=404)
+    if config.CACHE_HEADER:
+        patch_cache_control(response, max_age=config.CACHE_TIMEOUT)
+    return response
 
 
 def server_error(request, template_name="dpaste/500.html"):
-    return django_server_error(
-        request, template_name=template_name
-    )  # pragma: no cover
+    context = {}
+    context.update(config.extra_template_context)
+    response = render(request, template_name, context, status=500)
+    add_never_cache_headers(response)
+    return response