OpenSlides/openslides/utils/forms.py
Emanuel Schuetze 648d5a6ad7 Fixed CKEditor stuff:
- Added missing insertpre plugin and allow <pre> tag with class
  attribute. Added font style to base.css.
- Removed unused link to old ckeditor.css (now managed by
  django-ckeditor).
2014-07-14 22:54:53 +02:00

114 lines
3.5 KiB
Python

# -*- coding: utf-8 -*-
import bleach
from django import forms
from django.utils.translation import ugettext as _
from django.utils.translation import ugettext_lazy
# Allowed tags, attributes and styles allowed in textareas edited with a JS
# editor. Everything not in these whitelists is stripped.
HTML_TAG_WHITELIST = ('a',
'i',
'em',
'b',
'strong',
'ul',
'ol',
'li',
'p',
'br',
'span',
'strike',
'u',
'pre',
'h1',
'h2',
'h3',
'img')
HTML_ATTRIBUTES_WHITELIST = {
'a': ['href'],
'*': ['style'],
'pre': ['class'],
'img': ['src', 'width', 'height'],
}
HTML_STYLES_WHITELIST = ('color', 'background-color', 'list-style', 'width', 'height')
class CssClassMixin(object):
error_css_class = 'error'
required_css_class = 'required'
class LocalizedModelChoiceField(forms.ModelChoiceField):
"""
Subclass of Django's ModelChoiceField to translate the labels of the
model's objects.
"""
def label_from_instance(self, *args, **kwargs):
"""
Translates the output from Django's label_from_instance method.
"""
return _(super(LocalizedModelChoiceField, self).label_from_instance(*args, **kwargs))
class LocalizedModelMultipleChoiceField(forms.ModelMultipleChoiceField):
def __init__(self, *args, **kwargs):
self.to_field_name = kwargs.get('to_field_name', None)
super(LocalizedModelMultipleChoiceField, self).__init__(*args, **kwargs)
def _localized_get_choices(self):
if hasattr(self, '_choices'):
return self._choices
c = []
for (id, text) in super(LocalizedModelMultipleChoiceField, self)._get_choices():
text = text.split(' | ')[-1]
c.append((id, ugettext_lazy(text)))
return c
choices = property(_localized_get_choices, forms.ChoiceField._set_choices)
class CleanHtmlFormMixin(object):
"""
A form mixin that pre-processes the form, cleaning up the HTML code found
in the fields in clean_html. All HTML tags, attributes and styles not in the
whitelists are stripped from the output, leaving only the text content:
<table><tr><td>foo</td></tr></table> simply becomes 'foo'
"""
clean_html_fields = ()
def get_clean_html_fields(self):
"""
The list of elements to strip of potential malicious HTML.
"""
return self.clean_html_fields
def clean(self):
cleaned_data = super(CleanHtmlFormMixin, self).clean()
for field in self.get_clean_html_fields():
try:
cleaned_data[field] = bleach.clean(
cleaned_data[field],
tags=HTML_TAG_WHITELIST,
attributes=HTML_ATTRIBUTES_WHITELIST,
styles=HTML_STYLES_WHITELIST,
strip=True)
except KeyError:
# The field 'field' is not pressent. Do not change cleaned_data
pass
return cleaned_data
class CSVImportForm(CssClassMixin, forms.Form):
"""
Form for the CSVImportView.
"""
csvfile = forms.FileField(
widget=forms.FileInput(attrs={'size': '50'}),
label=ugettext_lazy('CSV File'),
help_text=ugettext_lazy('The file has to be encoded in UTF-8.'))