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[wolnelektury.git] / src / wolnelektury / utils.py

diff --git a/src/wolnelektury/utils.py b/src/wolnelektury/utils.py
index c65a172..33bf42c 100644 (file)
--- a/src/wolnelektury/utils.py
+++ b/src/wolnelektury/utils.py
@@ -8,24 +8,18 @@ from inspect import getargspec
 from io import BytesIO
 import json
 import os
-import pytz
 import re
 
+from django.conf import settings
+from django.contrib import admin
+from django.core.cache import cache
 from django.core.mail import send_mail
 from django.http import HttpResponse
 from django.template.loader import render_to_string
-from django.utils import timezone
+from django.utils.translation import get_language
 from django.conf import settings
-from django.utils.translation import ugettext
-
-
-tz = pytz.timezone(settings.TIME_ZONE)
-
-
-def localtime_to_utc(localtime):
-    return timezone.utc.normalize(
-        tz.localize(localtime)
-    )
+from django.utils.safestring import mark_safe
+from django.utils.translation import gettext as _
 
 
 def utc_for_js(dt):
@@ -90,7 +84,7 @@ def ajax(login_required=False, method=None, template=None, permission_required=N
                         if fun_kwargs or key in fun_params)
                     kwargs.update(stringify_keys(request_params))
                 res = None
-                if login_required and not request.user.is_authenticated():
+                if login_required and not request.user.is_authenticated:
                     res = {'result': 'logout'}
                 if (permission_required and
                         not request.user.has_perm(permission_required)):
@@ -114,8 +108,8 @@ def ajax(login_required=False, method=None, template=None, permission_required=N
 
 def send_noreply_mail(subject, message, recipient_list, **kwargs):
     send_mail(
-        u'[WolneLektury] ' + subject,
-        message + u"\n\n-- \n" + ugettext(u'Message sent automatically. Please do not reply.'),
+        '[WolneLektury] ' + subject,
+        message + "\n\n-- \n" + _('Message sent automatically. Please do not reply.'),
         'no-reply@wolnelektury.pl', recipient_list, **kwargs)
 
 
@@ -155,12 +149,58 @@ def re_escape(s):
     return re.sub(r"[(){}\[\].*?|^$\\+-]", r"\\\g<0>", s)
 
 
-BOT_BITS = ['bot', 'slurp', 'spider', 'facebook', 'crawler', 'parser', 'http']
+def get_cached_render_key(instance, property_name, language=None):
+    if language is None:
+        language = get_language()
+    return 'cached_render:%s.%s:%s:%s' % (
+            type(instance).__name__,
+            property_name,
+            instance.pk,
+            language
+        )
+
+
+def cached_render(template_name, timeout=24 * 60 * 60):
+    def decorator(method):
+        @wraps(method)
+        def wrapper(self):
+            key = get_cached_render_key(self, method.__name__)
+            content = cache.get(key)
+            if content is None:
+                context = method(self)
+                content = render_to_string(template_name, context)
+                cache.set(key, str(content), timeout=timeout)
+            else:
+                content = mark_safe(content)
+            return content
+        return wrapper
+    return decorator
+
+
+def clear_cached_renders(bound_method):
+    for lc, ln in settings.LANGUAGES:
+        cache.delete(
+            get_cached_render_key(
+                bound_method.__self__,
+                bound_method.__name__,
+                lc
+            )
+        )
+
+
+class YesNoFilter(admin.SimpleListFilter):
+    def lookups(self, request, model_admin):
+        return (
+            ('yes', _('Yes')),
+            ('no', _('No')),
+        )
+
+    def queryset(self, request, queryset):
+        if self.value() == 'yes':
+            return queryset.filter(self.q)
+        elif self.value() == 'no':
+            return queryset.exclude(self.q)
 
 
-def is_crawler(request):
-    user_agent = request.META.get('HTTP_USER_AGENT')
-    if not user_agent:
-        return True
-    user_agent = user_agent.lower()
-    return any(bot_bit in user_agent for bot_bit in BOT_BITS)
+def is_ajax(request):
+    return request.headers.get('x-requested-with') == 'XMLHttpRequest'