X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/d1d6ea8ed2889f871b6d89d4fae6021f286f921a..528a34731579d8b81df43879f2b63c2754005a86:/src/wolnelektury/utils.py

diff --git a/src/wolnelektury/utils.py b/src/wolnelektury/utils.py
index 142d33fe3..33bf42cc0 100644
--- a/src/wolnelektury/utils.py
+++ b/src/wolnelektury/utils.py
@@ -1,32 +1,25 @@
-# -*- coding: utf-8 -*-
 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
 import codecs
 import csv
-import cStringIO
-import json
-import os
 from functools import wraps
-
-import pytz
 from inspect import getargspec
-
+from io import BytesIO
+import json
+import os
 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):
@@ -40,7 +33,7 @@ def makedirs(path):
 
 def stringify_keys(dictionary):
     return dict((keyword.encode('ascii'), value)
-                for keyword, value in dictionary.iteritems())
+                for keyword, value in dictionary.items())
 
 
 def json_encode(obj, sort_keys=True, ensure_ascii=False):
@@ -87,11 +80,11 @@ def ajax(login_required=False, method=None, template=None, permission_required=N
                 if request_params:
                     request_params = dict(
                         (key, json_decode_fallback(value))
-                        for key, value in request_params.iteritems()
+                        for key, value in request_params.items()
                         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)):
@@ -115,8 +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)
 
 
@@ -129,7 +122,7 @@ class UnicodeCSVWriter(object):
 
     def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
         # Redirect output to a queue
-        self.queue = cStringIO.StringIO()
+        self.queue = BytesIO()
         self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
         self.stream = f
         self.encoder = codecs.getincrementalencoder(encoding)()
@@ -156,12 +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'