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import re
import time
import datetime
from django import forms
from django.forms.util import ErrorDict
from django.conf import settings
from django.http import Http404
from django.contrib.contenttypes.models import ContentType
from models import Comment
from django.utils.encoding import force_unicode
from django.utils.hashcompat import sha_constructor
from django.utils.text import get_text_list
from django.utils.translation import ungettext, ugettext_lazy as _
COMMENT_MAX_LENGTH = getattr(settings,'COMMENT_MAX_LENGTH', 3000)
class CommentForm(forms.Form):
name = forms.CharField(label=_("Name"), max_length=50)
email = forms.EmailField(label=_("Email address"))
url = forms.URLField(label=_("URL"), required=False)
comment = forms.CharField(label=_('Comment'), widget=forms.Textarea,
max_length=COMMENT_MAX_LENGTH)
honeypot = forms.CharField(required=False,
label=_('If you enter anything in this field '\
'your comment will be treated as spam'))
content_type = forms.CharField(widget=forms.HiddenInput)
object_pk = forms.CharField(widget=forms.HiddenInput)
timestamp = forms.IntegerField(widget=forms.HiddenInput)
security_hash = forms.CharField(min_length=40, max_length=40, widget=forms.HiddenInput)
def __init__(self, target_object, data=None, initial=None):
self.target_object = target_object
if initial is None:
initial = {}
initial.update(self.generate_security_data())
super(CommentForm, self).__init__(data=data, initial=initial)
def get_comment_object(self):
"""
Return a new (unsaved) comment object based on the information in this
form. Assumes that the form is already validated and will throw a
ValueError if not.
Does not set any of the fields that would come from a Request object
(i.e. ``user`` or ``ip_address``).
"""
if not self.is_valid():
raise ValueError("get_comment_object may only be called on valid forms")
new = Comment(
content_type = ContentType.objects.get_for_model(self.target_object),
object_pk = force_unicode(self.target_object._get_pk_val()),
user_name = self.cleaned_data["name"],
user_email = self.cleaned_data["email"],
user_url = self.cleaned_data["url"],
comment = self.cleaned_data["comment"],
submit_date = datetime.datetime.now(),
site_id = settings.SITE_ID,
is_public = True,
is_removed = False,
)
# Check that this comment isn't duplicate. (Sometimes people post comments
# twice by mistake.) If it is, fail silently by returning the old comment.
possible_duplicates = Comment.objects.filter(
content_type = new.content_type,
object_pk = new.object_pk,
user_name = new.user_name,
user_email = new.user_email,
user_url = new.user_url,
)
for old in possible_duplicates:
if old.submit_date.date() == new.submit_date.date() and old.comment == new.comment:
return old
return new
def security_errors(self):
"""Return just those errors associated with security"""
errors = ErrorDict()
for f in ["honeypot", "timestamp", "security_hash"]:
if f in self.errors:
errors[f] = self.errors[f]
return errors
def clean_honeypot(self):
"""Check that nothing's been entered into the honeypot."""
value = self.cleaned_data["honeypot"]
if value:
raise forms.ValidationError(self.fields["honeypot"].label)
return value
def clean_security_hash(self):
"""Check the security hash."""
security_hash_dict = {
'content_type' : self.data.get("content_type", ""),
'object_pk' : self.data.get("object_pk", ""),
'timestamp' : self.data.get("timestamp", ""),
}
expected_hash = self.generate_security_hash(**security_hash_dict)
actual_hash = self.cleaned_data["security_hash"]
if expected_hash != actual_hash:
raise forms.ValidationError("Security hash check failed.")
return actual_hash
def clean_timestamp(self):
"""Make sure the timestamp isn't too far (> 2 hours) in the past."""
ts = self.cleaned_data["timestamp"]
if time.time() - ts > (2 * 60 * 60):
raise forms.ValidationError("Timestamp check failed")
return ts
def clean_comment(self):
"""
If COMMENTS_ALLOW_PROFANITIES is False, check that the comment doesn't
contain anything in PROFANITIES_LIST.
"""
comment = self.cleaned_data["comment"]
if settings.COMMENTS_ALLOW_PROFANITIES == False:
bad_words = [w for w in settings.PROFANITIES_LIST if w in comment.lower()]
if bad_words:
plural = len(bad_words) > 1
raise forms.ValidationError(ungettext(
"Watch your mouth! The word %s is not allowed here.",
"Watch your mouth! The words %s are not allowed here.", plural) % \
get_text_list(['"%s%s%s"' % (i[0], '-'*(len(i)-2), i[-1]) for i in bad_words], 'and'))
return comment
def generate_security_data(self):
"""Generate a dict of security data for "initial" data."""
timestamp = int(time.time())
security_dict = {
'content_type' : str(self.target_object._meta),
'object_pk' : str(self.target_object._get_pk_val()),
'timestamp' : str(timestamp),
'security_hash' : self.initial_security_hash(timestamp),
}
return security_dict
def initial_security_hash(self, timestamp):
"""
Generate the initial security hash from self.content_object
and a (unix) timestamp.
"""
initial_security_dict = {
'content_type' : str(self.target_object._meta),
'object_pk' : str(self.target_object._get_pk_val()),
'timestamp' : str(timestamp),
}
return self.generate_security_hash(**initial_security_dict)
def generate_security_hash(self, content_type, object_pk, timestamp):
"""Generate a (SHA1) security hash from the provided info."""
info = (content_type, object_pk, timestamp, settings.SECRET_KEY)
return sha_constructor("".join(info)).hexdigest()
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