/src/lbforum/templatetags/helper.py

#!/usr/bin/env python

# -*- coding: UTF-8 -*-

from BeautifulSoup import BeautifulSoup, NavigableString

from django.conf import settings



acceptable_elements = ['a', 'abbr', 'acronym', 'address', 'area', 'b', 'big',

      'blockquote', 'br', 'button', 'caption', 'center', 'cite', 'code', 'col',

      'colgroup', 'dd', 'del', 'dfn', 'dir', 'div', 'dl', 'dt', 'em',

      'font', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'img', 

      'ins', 'kbd', 'label', 'legend', 'li', 'map', 'menu', 'ol', 

      'p', 'pre', 'q', 's', 'samp', 'small', 'span', 'strike',

      'strong', 'sub', 'sup', 'table', 'tbody', 'td', 'tfoot', 'th',

      'thead', 'tr', 'tt', 'u', 'ul', 'var']



acceptable_attributes = ['abbr', 'accept', 'accept-charset', 'accesskey',

  'action', 'align', 'alt', 'axis', 'border', 'cellpadding', 'cellspacing',

  'char', 'charoff', 'charset', 'checked', 'cite', 'clear', 'cols',

  'colspan', 'color', 'compact', 'coords', 'datetime', 'dir', 

  'enctype', 'for', 'headers', 'height', 'href', 'hreflang', 'hspace',

  'id', 'ismap', 'label', 'lang', 'longdesc', 'maxlength', 'method',

  'multiple', 'name', 'nohref', 'noshade', 'nowrap', 'prompt', 

  'rel', 'rev', 'rows', 'rowspan', 'rules', 'scope', 'shape', 'size',

  'span', 'src', 'start', 'summary', 'tabindex', 'target', 'title', 'type',

  'usemap', 'valign', 'value', 'vspace', 'width', 'style']



acceptable_elements.extend(getattr(settings, 'HTML_SAFE_TAGS', []))

acceptable_attributes.extend(getattr(settings, 'HTML_SAFE_ATTRS', []))

acceptable_elements = set(acceptable_elements) - set(getattr(settings, 'HTML_UNSAFE_TAGS', []))

acceptable_attributes = set(acceptable_attributes) - set(getattr(settings, 'HTML_UNSAFE_ATTRS', []))



def clean_html( fragment ):

    soup = BeautifulSoup( fragment.strip() )

    def cleanup( soup ):

        for tag in soup:

            if not isinstance( tag, NavigableString):

                if tag.name not in acceptable_elements:

                    tag.extract()

                else:

                    for attr in tag._getAttrMap().keys():

                        if attr not in acceptable_attributes:

                            del tag[attr]

                    cleanup( tag )

    cleanup( soup )

    return unicode( soup )