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