forked from feincms/feincms
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathchangedate.py
More file actions
69 lines (51 loc) · 2.2 KB
/
changedate.py
File metadata and controls
69 lines (51 loc) · 2.2 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
# ------------------------------------------------------------------------
# ------------------------------------------------------------------------
"""
Track the modification date for objects.
"""
from email.utils import mktime_tz, parsedate_tz
from time import mktime
from django.db import models
from django.db.models.signals import pre_save
from django.utils import timezone
from django.utils.http import http_date
from django.utils.translation import gettext_lazy as _
from feincms import extensions
# ------------------------------------------------------------------------
def pre_save_handler(sender, instance, **kwargs):
"""
Intercept attempts to save and insert the current date and time into
creation and modification date fields.
"""
now = timezone.now()
if instance.id is None:
instance.creation_date = now
instance.modification_date = now
# ------------------------------------------------------------------------
def dt_to_utc_timestamp(dt):
return int(mktime(dt.timetuple()))
class Extension(extensions.Extension):
def handle_model(self):
self.model.add_to_class(
"creation_date",
models.DateTimeField(_("creation date"), null=True, editable=False),
)
self.model.add_to_class(
"modification_date",
models.DateTimeField(_("modification date"), null=True, editable=False),
)
self.model.last_modified = lambda p: p.modification_date
pre_save.connect(pre_save_handler, sender=self.model)
# ------------------------------------------------------------------------
def last_modified_response_processor(page, request, response):
# Don't include Last-Modified if we don't want to be cached
if "no-cache" in response.get("Cache-Control", ""):
return
# If we already have a Last-Modified, take the later one
last_modified = dt_to_utc_timestamp(page.last_modified())
if response.has_header("Last-Modified"):
last_modified = max(
last_modified, mktime_tz(parsedate_tz(response["Last-Modified"]))
)
response["Last-Modified"] = http_date(last_modified)
# ------------------------------------------------------------------------