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| import cssutils | |
| from xml.sax import saxutils | |
| from lxml.html import tostring, fromstring, clean | |
| from lxml import etree | |
| import logging | |
| class Cleaner(clean.Cleaner): | |
| def clean_html(self, html): | |
| if not isinstance(html, unicode): | |
| raise ValueError('We only support cleaning unicode HTML fragments') | |
| #We wrap the content up in an extra div tag (otherwise lxml does wierd things to it - like adding in <p> tags and stuff) | |
| divnode = fromstring(u'<div>' + html + u'</div>') | |
| self(divnode) | |
| # Strip all class attributes | |
| etree.strip_attributes(divnode, 'class') | |
| for style in divnode.xpath("//@style"): | |
| parent = style.getparent() | |
| try: | |
| cssStyle = cssutils.parseStyle(style) | |
| except Exception, e: | |
| logging.info("Style %s failed to parse with error %s." % (style, e)) | |
| parent.attrib.pop('style', None) | |
| continue | |
| # Set the line separator so that the style gets serialized | |
| cssutils.ser.prefs.lineSeparator = '' | |
| # Only allow valid style properties | |
| cssutils.ser.prefs.validOnly = True | |
| new_style = cssStyle.cssText | |
| if not new_style.strip(): | |
| parent.attrib.pop('style', None) | |
| else: | |
| parent.attrib['style'] = new_style | |
| # Drop all empty span tags | |
| for span_tag in divnode.xpath("//span"): | |
| if not span_tag.keys(): | |
| span_tag.drop_tag() | |
| #Now unwrap the divnode (i.e. just serialize the children of our extra div node) | |
| cleaned = saxutils.escape(divnode.text) if divnode.text else '' | |
| for n in divnode: | |
| cleaned += tostring(n, encoding = unicode, method = 'xml') | |
| return cleaned | |
| # We need safe_attrs_only set to False, otherwise it strips out style attributes completely | |
| cleaner = Cleaner(safe_attrs_only=False) | |
| clean_html = cleaner.clean_html |
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