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Current File : /lib/python3.6/site-packages/html5lib/filters/sanitizer.py
from __future__ import absolute_import, division, unicode_literals

import re
from xml.sax.saxutils import escape, unescape

from six.moves import urllib_parse as urlparse

from . import base
from ..constants import namespaces, prefixes

__all__ = ["Filter"]


allowed_elements = frozenset((
    (namespaces['html'], 'a'),
    (namespaces['html'], 'abbr'),
    (namespaces['html'], 'acronym'),
    (namespaces['html'], 'address'),
    (namespaces['html'], 'area'),
    (namespaces['html'], 'article'),
    (namespaces['html'], 'aside'),
    (namespaces['html'], 'audio'),
    (namespaces['html'], 'b'),
    (namespaces['html'], 'big'),
    (namespaces['html'], 'blockquote'),
    (namespaces['html'], 'br'),
    (namespaces['html'], 'button'),
    (namespaces['html'], 'canvas'),
    (namespaces['html'], 'caption'),
    (namespaces['html'], 'center'),
    (namespaces['html'], 'cite'),
    (namespaces['html'], 'code'),
    (namespaces['html'], 'col'),
    (namespaces['html'], 'colgroup'),
    (namespaces['html'], 'command'),
    (namespaces['html'], 'datagrid'),
    (namespaces['html'], 'datalist'),
    (namespaces['html'], 'dd'),
    (namespaces['html'], 'del'),
    (namespaces['html'], 'details'),
    (namespaces['html'], 'dfn'),
    (namespaces['html'], 'dialog'),
    (namespaces['html'], 'dir'),
    (namespaces['html'], 'div'),
    (namespaces['html'], 'dl'),
    (namespaces['html'], 'dt'),
    (namespaces['html'], 'em'),
    (namespaces['html'], 'event-source'),
    (namespaces['html'], 'fieldset'),
    (namespaces['html'], 'figcaption'),
    (namespaces['html'], 'figure'),
    (namespaces['html'], 'footer'),
    (namespaces['html'], 'font'),
    (namespaces['html'], 'form'),
    (namespaces['html'], 'header'),
    (namespaces['html'], 'h1'),
    (namespaces['html'], 'h2'),
    (namespaces['html'], 'h3'),
    (namespaces['html'], 'h4'),
    (namespaces['html'], 'h5'),
    (namespaces['html'], 'h6'),
    (namespaces['html'], 'hr'),
    (namespaces['html'], 'i'),
    (namespaces['html'], 'img'),
    (namespaces['html'], 'input'),
    (namespaces['html'], 'ins'),
    (namespaces['html'], 'keygen'),
    (namespaces['html'], 'kbd'),
    (namespaces['html'], 'label'),
    (namespaces['html'], 'legend'),
    (namespaces['html'], 'li'),
    (namespaces['html'], 'm'),
    (namespaces['html'], 'map'),
    (namespaces['html'], 'menu'),
    (namespaces['html'], 'meter'),
    (namespaces['html'], 'multicol'),
    (namespaces['html'], 'nav'),
    (namespaces['html'], 'nextid'),
    (namespaces['html'], 'ol'),
    (namespaces['html'], 'output'),
    (namespaces['html'], 'optgroup'),
    (namespaces['html'], 'option'),
    (namespaces['html'], 'p'),
    (namespaces['html'], 'pre'),
    (namespaces['html'], 'progress'),
    (namespaces['html'], 'q'),
    (namespaces['html'], 's'),
    (namespaces['html'], 'samp'),
    (namespaces['html'], 'section'),
    (namespaces['html'], 'select'),
    (namespaces['html'], 'small'),
    (namespaces['html'], 'sound'),
    (namespaces['html'], 'source'),
    (namespaces['html'], 'spacer'),
    (namespaces['html'], 'span'),
    (namespaces['html'], 'strike'),
    (namespaces['html'], 'strong'),
    (namespaces['html'], 'sub'),
    (namespaces['html'], 'sup'),
    (namespaces['html'], 'table'),
    (namespaces['html'], 'tbody'),
    (namespaces['html'], 'td'),
    (namespaces['html'], 'textarea'),
    (namespaces['html'], 'time'),
    (namespaces['html'], 'tfoot'),
    (namespaces['html'], 'th'),
    (namespaces['html'], 'thead'),
    (namespaces['html'], 'tr'),
    (namespaces['html'], 'tt'),
    (namespaces['html'], 'u'),
    (namespaces['html'], 'ul'),
    (namespaces['html'], 'var'),
    (namespaces['html'], 'video'),
    (namespaces['mathml'], 'maction'),
    (namespaces['mathml'], 'math'),
    (namespaces['mathml'], 'merror'),
    (namespaces['mathml'], 'mfrac'),
    (namespaces['mathml'], 'mi'),
    (namespaces['mathml'], 'mmultiscripts'),
    (namespaces['mathml'], 'mn'),
    (namespaces['mathml'], 'mo'),
    (namespaces['mathml'], 'mover'),
    (namespaces['mathml'], 'mpadded'),
    (namespaces['mathml'], 'mphantom'),
    (namespaces['mathml'], 'mprescripts'),
    (namespaces['mathml'], 'mroot'),
    (namespaces['mathml'], 'mrow'),
    (namespaces['mathml'], 'mspace'),
    (namespaces['mathml'], 'msqrt'),
    (namespaces['mathml'], 'mstyle'),
    (namespaces['mathml'], 'msub'),
    (namespaces['mathml'], 'msubsup'),
    (namespaces['mathml'], 'msup'),
    (namespaces['mathml'], 'mtable'),
    (namespaces['mathml'], 'mtd'),
    (namespaces['mathml'], 'mtext'),
    (namespaces['mathml'], 'mtr'),
    (namespaces['mathml'], 'munder'),
    (namespaces['mathml'], 'munderover'),
    (namespaces['mathml'], 'none'),
    (namespaces['svg'], 'a'),
    (namespaces['svg'], 'animate'),
    (namespaces['svg'], 'animateColor'),
    (namespaces['svg'], 'animateMotion'),
    (namespaces['svg'], 'animateTransform'),
    (namespaces['svg'], 'clipPath'),
    (namespaces['svg'], 'circle'),
    (namespaces['svg'], 'defs'),
    (namespaces['svg'], 'desc'),
    (namespaces['svg'], 'ellipse'),
    (namespaces['svg'], 'font-face'),
    (namespaces['svg'], 'font-face-name'),
    (namespaces['svg'], 'font-face-src'),
    (namespaces['svg'], 'g'),
    (namespaces['svg'], 'glyph'),
    (namespaces['svg'], 'hkern'),
    (namespaces['svg'], 'linearGradient'),
    (namespaces['svg'], 'line'),
    (namespaces['svg'], 'marker'),
    (namespaces['svg'], 'metadata'),
    (namespaces['svg'], 'missing-glyph'),
    (namespaces['svg'], 'mpath'),
    (namespaces['svg'], 'path'),
    (namespaces['svg'], 'polygon'),
    (namespaces['svg'], 'polyline'),
    (namespaces['svg'], 'radialGradient'),
    (namespaces['svg'], 'rect'),
    (namespaces['svg'], 'set'),
    (namespaces['svg'], 'stop'),
    (namespaces['svg'], 'svg'),
    (namespaces['svg'], 'switch'),
    (namespaces['svg'], 'text'),
    (namespaces['svg'], 'title'),
    (namespaces['svg'], 'tspan'),
    (namespaces['svg'], 'use'),
))

allowed_attributes = frozenset((
    # HTML attributes
    (None, 'abbr'),
    (None, 'accept'),
    (None, 'accept-charset'),
    (None, 'accesskey'),
    (None, 'action'),
    (None, 'align'),
    (None, 'alt'),
    (None, 'autocomplete'),
    (None, 'autofocus'),
    (None, 'axis'),
    (None, 'background'),
    (None, 'balance'),
    (None, 'bgcolor'),
    (None, 'bgproperties'),
    (None, 'border'),
    (None, 'bordercolor'),
    (None, 'bordercolordark'),
    (None, 'bordercolorlight'),
    (None, 'bottompadding'),
    (None, 'cellpadding'),
    (None, 'cellspacing'),
    (None, 'ch'),
    (None, 'challenge'),
    (None, 'char'),
    (None, 'charoff'),
    (None, 'choff'),
    (None, 'charset'),
    (None, 'checked'),
    (None, 'cite'),
    (None, 'class'),
    (None, 'clear'),
    (None, 'color'),
    (None, 'cols'),
    (None, 'colspan'),
    (None, 'compact'),
    (None, 'contenteditable'),
    (None, 'controls'),
    (None, 'coords'),
    (None, 'data'),
    (None, 'datafld'),
    (None, 'datapagesize'),
    (None, 'datasrc'),
    (None, 'datetime'),
    (None, 'default'),
    (None, 'delay'),
    (None, 'dir'),
    (None, 'disabled'),
    (None, 'draggable'),
    (None, 'dynsrc'),
    (None, 'enctype'),
    (None, 'end'),
    (None, 'face'),
    (None, 'for'),
    (None, 'form'),
    (None, 'frame'),
    (None, 'galleryimg'),
    (None, 'gutter'),
    (None, 'headers'),
    (None, 'height'),
    (None, 'hidefocus'),
    (None, 'hidden'),
    (None, 'high'),
    (None, 'href'),
    (None, 'hreflang'),
    (None, 'hspace'),
    (None, 'icon'),
    (None, 'id'),
    (None, 'inputmode'),
    (None, 'ismap'),
    (None, 'keytype'),
    (None, 'label'),
    (None, 'leftspacing'),
    (None, 'lang'),
    (None, 'list'),
    (None, 'longdesc'),
    (None, 'loop'),
    (None, 'loopcount'),
    (None, 'loopend'),
    (None, 'loopstart'),
    (None, 'low'),
    (None, 'lowsrc'),
    (None, 'max'),
    (None, 'maxlength'),
    (None, 'media'),
    (None, 'method'),
    (None, 'min'),
    (None, 'multiple'),
    (None, 'name'),
    (None, 'nohref'),
    (None, 'noshade'),
    (None, 'nowrap'),
    (None, 'open'),
    (None, 'optimum'),
    (None, 'pattern'),
    (None, 'ping'),
    (None, 'point-size'),
    (None, 'poster'),
    (None, 'pqg'),
    (None, 'preload'),
    (None, 'prompt'),
    (None, 'radiogroup'),
    (None, 'readonly'),
    (None, 'rel'),
    (None, 'repeat-max'),
    (None, 'repeat-min'),
    (None, 'replace'),
    (None, 'required'),
    (None, 'rev'),
    (None, 'rightspacing'),
    (None, 'rows'),
    (None, 'rowspan'),
    (None, 'rules'),
    (None, 'scope'),
    (None, 'selected'),
    (None, 'shape'),
    (None, 'size'),
    (None, 'span'),
    (None, 'src'),
    (None, 'start'),
    (None, 'step'),
    (None, 'style'),
    (None, 'summary'),
    (None, 'suppress'),
    (None, 'tabindex'),
    (None, 'target'),
    (None, 'template'),
    (None, 'title'),
    (None, 'toppadding'),
    (None, 'type'),
    (None, 'unselectable'),
    (None, 'usemap'),
    (None, 'urn'),
    (None, 'valign'),
    (None, 'value'),
    (None, 'variable'),
    (None, 'volume'),
    (None, 'vspace'),
    (None, 'vrml'),
    (None, 'width'),
    (None, 'wrap'),
    (namespaces['xml'], 'lang'),
    # MathML attributes
    (None, 'actiontype'),
    (None, 'align'),
    (None, 'columnalign'),
    (None, 'columnalign'),
    (None, 'columnalign'),
    (None, 'columnlines'),
    (None, 'columnspacing'),
    (None, 'columnspan'),
    (None, 'depth'),
    (None, 'display'),
    (None, 'displaystyle'),
    (None, 'equalcolumns'),
    (None, 'equalrows'),
    (None, 'fence'),
    (None, 'fontstyle'),
    (None, 'fontweight'),
    (None, 'frame'),
    (None, 'height'),
    (None, 'linethickness'),
    (None, 'lspace'),
    (None, 'mathbackground'),
    (None, 'mathcolor'),
    (None, 'mathvariant'),
    (None, 'mathvariant'),
    (None, 'maxsize'),
    (None, 'minsize'),
    (None, 'other'),
    (None, 'rowalign'),
    (None, 'rowalign'),
    (None, 'rowalign'),
    (None, 'rowlines'),
    (None, 'rowspacing'),
    (None, 'rowspan'),
    (None, 'rspace'),
    (None, 'scriptlevel'),
    (None, 'selection'),
    (None, 'separator'),
    (None, 'stretchy'),
    (None, 'width'),
    (None, 'width'),
    (namespaces['xlink'], 'href'),
    (namespaces['xlink'], 'show'),
    (namespaces['xlink'], 'type'),
    # SVG attributes
    (None, 'accent-height'),
    (None, 'accumulate'),
    (None, 'additive'),
    (None, 'alphabetic'),
    (None, 'arabic-form'),
    (None, 'ascent'),
    (None, 'attributeName'),
    (None, 'attributeType'),
    (None, 'baseProfile'),
    (None, 'bbox'),
    (None, 'begin'),
    (None, 'by'),
    (None, 'calcMode'),
    (None, 'cap-height'),
    (None, 'class'),
    (None, 'clip-path'),
    (None, 'color'),
    (None, 'color-rendering'),
    (None, 'content'),
    (None, 'cx'),
    (None, 'cy'),
    (None, 'd'),
    (None, 'dx'),
    (None, 'dy'),
    (None, 'descent'),
    (None, 'display'),
    (None, 'dur'),
    (None, 'end'),
    (None, 'fill'),
    (None, 'fill-opacity'),
    (None, 'fill-rule'),
    (None, 'font-family'),
    (None, 'font-size'),
    (None, 'font-stretch'),
    (None, 'font-style'),
    (None, 'font-variant'),
    (None, 'font-weight'),
    (None, 'from'),
    (None, 'fx'),
    (None, 'fy'),
    (None, 'g1'),
    (None, 'g2'),
    (None, 'glyph-name'),
    (None, 'gradientUnits'),
    (None, 'hanging'),
    (None, 'height'),
    (None, 'horiz-adv-x'),
    (None, 'horiz-origin-x'),
    (None, 'id'),
    (None, 'ideographic'),
    (None, 'k'),
    (None, 'keyPoints'),
    (None, 'keySplines'),
    (None, 'keyTimes'),
    (None, 'lang'),
    (None, 'marker-end'),
    (None, 'marker-mid'),
    (None, 'marker-start'),
    (None, 'markerHeight'),
    (None, 'markerUnits'),
    (None, 'markerWidth'),
    (None, 'mathematical'),
    (None, 'max'),
    (None, 'min'),
    (None, 'name'),
    (None, 'offset'),
    (None, 'opacity'),
    (None, 'orient'),
    (None, 'origin'),
    (None, 'overline-position'),
    (None, 'overline-thickness'),
    (None, 'panose-1'),
    (None, 'path'),
    (None, 'pathLength'),
    (None, 'points'),
    (None, 'preserveAspectRatio'),
    (None, 'r'),
    (None, 'refX'),
    (None, 'refY'),
    (None, 'repeatCount'),
    (None, 'repeatDur'),
    (None, 'requiredExtensions'),
    (None, 'requiredFeatures'),
    (None, 'restart'),
    (None, 'rotate'),
    (None, 'rx'),
    (None, 'ry'),
    (None, 'slope'),
    (None, 'stemh'),
    (None, 'stemv'),
    (None, 'stop-color'),
    (None, 'stop-opacity'),
    (None, 'strikethrough-position'),
    (None, 'strikethrough-thickness'),
    (None, 'stroke'),
    (None, 'stroke-dasharray'),
    (None, 'stroke-dashoffset'),
    (None, 'stroke-linecap'),
    (None, 'stroke-linejoin'),
    (None, 'stroke-miterlimit'),
    (None, 'stroke-opacity'),
    (None, 'stroke-width'),
    (None, 'systemLanguage'),
    (None, 'target'),
    (None, 'text-anchor'),
    (None, 'to'),
    (None, 'transform'),
    (None, 'type'),
    (None, 'u1'),
    (None, 'u2'),
    (None, 'underline-position'),
    (None, 'underline-thickness'),
    (None, 'unicode'),
    (None, 'unicode-range'),
    (None, 'units-per-em'),
    (None, 'values'),
    (None, 'version'),
    (None, 'viewBox'),
    (None, 'visibility'),
    (None, 'width'),
    (None, 'widths'),
    (None, 'x'),
    (None, 'x-height'),
    (None, 'x1'),
    (None, 'x2'),
    (namespaces['xlink'], 'actuate'),
    (namespaces['xlink'], 'arcrole'),
    (namespaces['xlink'], 'href'),
    (namespaces['xlink'], 'role'),
    (namespaces['xlink'], 'show'),
    (namespaces['xlink'], 'title'),
    (namespaces['xlink'], 'type'),
    (namespaces['xml'], 'base'),
    (namespaces['xml'], 'lang'),
    (namespaces['xml'], 'space'),
    (None, 'y'),
    (None, 'y1'),
    (None, 'y2'),
    (None, 'zoomAndPan'),
))

attr_val_is_uri = frozenset((
    (None, 'href'),
    (None, 'src'),
    (None, 'cite'),
    (None, 'action'),
    (None, 'longdesc'),
    (None, 'poster'),
    (None, 'background'),
    (None, 'datasrc'),
    (None, 'dynsrc'),
    (None, 'lowsrc'),
    (None, 'ping'),
    (namespaces['xlink'], 'href'),
    (namespaces['xml'], 'base'),
))

svg_attr_val_allows_ref = frozenset((
    (None, 'clip-path'),
    (None, 'color-profile'),
    (None, 'cursor'),
    (None, 'fill'),
    (None, 'filter'),
    (None, 'marker'),
    (None, 'marker-start'),
    (None, 'marker-mid'),
    (None, 'marker-end'),
    (None, 'mask'),
    (None, 'stroke'),
))

svg_allow_local_href = frozenset((
    (None, 'altGlyph'),
    (None, 'animate'),
    (None, 'animateColor'),
    (None, 'animateMotion'),
    (None, 'animateTransform'),
    (None, 'cursor'),
    (None, 'feImage'),
    (None, 'filter'),
    (None, 'linearGradient'),
    (None, 'pattern'),
    (None, 'radialGradient'),
    (None, 'textpath'),
    (None, 'tref'),
    (None, 'set'),
    (None, 'use')
))

allowed_css_properties = frozenset((
    'azimuth',
    'background-color',
    'border-bottom-color',
    'border-collapse',
    'border-color',
    'border-left-color',
    'border-right-color',
    'border-top-color',
    'clear',
    'color',
    'cursor',
    'direction',
    'display',
    'elevation',
    'float',
    'font',
    'font-family',
    'font-size',
    'font-style',
    'font-variant',
    'font-weight',
    'height',
    'letter-spacing',
    'line-height',
    'overflow',
    'pause',
    'pause-after',
    'pause-before',
    'pitch',
    'pitch-range',
    'richness',
    'speak',
    'speak-header',
    'speak-numeral',
    'speak-punctuation',
    'speech-rate',
    'stress',
    'text-align',
    'text-decoration',
    'text-indent',
    'unicode-bidi',
    'vertical-align',
    'voice-family',
    'volume',
    'white-space',
    'width',
))

allowed_css_keywords = frozenset((
    'auto',
    'aqua',
    'black',
    'block',
    'blue',
    'bold',
    'both',
    'bottom',
    'brown',
    'center',
    'collapse',
    'dashed',
    'dotted',
    'fuchsia',
    'gray',
    'green',
    '!important',
    'italic',
    'left',
    'lime',
    'maroon',
    'medium',
    'none',
    'navy',
    'normal',
    'nowrap',
    'olive',
    'pointer',
    'purple',
    'red',
    'right',
    'solid',
    'silver',
    'teal',
    'top',
    'transparent',
    'underline',
    'white',
    'yellow',
))

allowed_svg_properties = frozenset((
    'fill',
    'fill-opacity',
    'fill-rule',
    'stroke',
    'stroke-width',
    'stroke-linecap',
    'stroke-linejoin',
    'stroke-opacity',
))

allowed_protocols = frozenset((
    'ed2k',
    'ftp',
    'http',
    'https',
    'irc',
    'mailto',
    'news',
    'gopher',
    'nntp',
    'telnet',
    'webcal',
    'xmpp',
    'callto',
    'feed',
    'urn',
    'aim',
    'rsync',
    'tag',
    'ssh',
    'sftp',
    'rtsp',
    'afs',
    'data',
))

allowed_content_types = frozenset((
    'image/png',
    'image/jpeg',
    'image/gif',
    'image/webp',
    'image/bmp',
    'text/plain',
))


data_content_type = re.compile(r'''
                                ^
                                # Match a content type <application>/<type>
                                (?P<content_type>[-a-zA-Z0-9.]+/[-a-zA-Z0-9.]+)
                                # Match any character set and encoding
                                (?:(?:;charset=(?:[-a-zA-Z0-9]+)(?:;(?:base64))?)
                                  |(?:;(?:base64))?(?:;charset=(?:[-a-zA-Z0-9]+))?)
                                # Assume the rest is data
                                ,.*
                                $
                                ''',
                               re.VERBOSE)


class Filter(base.Filter):
    """ sanitization of XHTML+MathML+SVG and of inline style attributes."""
    def __init__(self,
                 source,
                 allowed_elements=allowed_elements,
                 allowed_attributes=allowed_attributes,
                 allowed_css_properties=allowed_css_properties,
                 allowed_css_keywords=allowed_css_keywords,
                 allowed_svg_properties=allowed_svg_properties,
                 allowed_protocols=allowed_protocols,
                 allowed_content_types=allowed_content_types,
                 attr_val_is_uri=attr_val_is_uri,
                 svg_attr_val_allows_ref=svg_attr_val_allows_ref,
                 svg_allow_local_href=svg_allow_local_href):
        super(Filter, self).__init__(source)
        self.allowed_elements = allowed_elements
        self.allowed_attributes = allowed_attributes
        self.allowed_css_properties = allowed_css_properties
        self.allowed_css_keywords = allowed_css_keywords
        self.allowed_svg_properties = allowed_svg_properties
        self.allowed_protocols = allowed_protocols
        self.allowed_content_types = allowed_content_types
        self.attr_val_is_uri = attr_val_is_uri
        self.svg_attr_val_allows_ref = svg_attr_val_allows_ref
        self.svg_allow_local_href = svg_allow_local_href

    def __iter__(self):
        for token in base.Filter.__iter__(self):
            token = self.sanitize_token(token)
            if token:
                yield token

    # Sanitize the +html+, escaping all elements not in ALLOWED_ELEMENTS, and
    # stripping out all # attributes not in ALLOWED_ATTRIBUTES. Style
    # attributes are parsed, and a restricted set, # specified by
    # ALLOWED_CSS_PROPERTIES and ALLOWED_CSS_KEYWORDS, are allowed through.
    # attributes in ATTR_VAL_IS_URI are scanned, and only URI schemes specified
    # in ALLOWED_PROTOCOLS are allowed.
    #
    #   sanitize_html('<script> do_nasty_stuff() </script>')
    #    => &lt;script> do_nasty_stuff() &lt;/script>
    #   sanitize_html('<a href="javascript: sucker();">Click here for $100</a>')
    #    => <a>Click here for $100</a>
    def sanitize_token(self, token):

        # accommodate filters which use token_type differently
        token_type = token["type"]
        if token_type in ("StartTag", "EndTag", "EmptyTag"):
            name = token["name"]
            namespace = token["namespace"]
            if ((namespace, name) in self.allowed_elements or
                (namespace is None and
                 (namespaces["html"], name) in self.allowed_elements)):
                return self.allowed_token(token)
            else:
                return self.disallowed_token(token)
        elif token_type == "Comment":
            pass
        else:
            return token

    def allowed_token(self, token):
        if "data" in token:
            attrs = token["data"]
            attr_names = set(attrs.keys())

            # Remove forbidden attributes
            for to_remove in (attr_names - self.allowed_attributes):
                del token["data"][to_remove]
                attr_names.remove(to_remove)

            # Remove attributes with disallowed URL values
            for attr in (attr_names & self.attr_val_is_uri):
                assert attr in attrs
                # I don't have a clue where this regexp comes from or why it matches those
                # characters, nor why we call unescape. I just know it's always been here.
                # Should you be worried by this comment in a sanitizer? Yes. On the other hand, all
                # this will do is remove *more* than it otherwise would.
                val_unescaped = re.sub("[`\x00-\x20\x7f-\xa0\s]+", '',
                                       unescape(attrs[attr])).lower()
                # remove replacement characters from unescaped characters
                val_unescaped = val_unescaped.replace("\ufffd", "")
                try:
                    uri = urlparse.urlparse(val_unescaped)
                except ValueError:
                    uri = None
                    del attrs[attr]
                if uri and uri.scheme:
                    if uri.scheme not in self.allowed_protocols:
                        del attrs[attr]
                    if uri.scheme == 'data':
                        m = data_content_type.match(uri.path)
                        if not m:
                            del attrs[attr]
                        elif m.group('content_type') not in self.allowed_content_types:
                            del attrs[attr]

            for attr in self.svg_attr_val_allows_ref:
                if attr in attrs:
                    attrs[attr] = re.sub(r'url\s*\(\s*[^#\s][^)]+?\)',
                                         ' ',
                                         unescape(attrs[attr]))
            if (token["name"] in self.svg_allow_local_href and
                (namespaces['xlink'], 'href') in attrs and re.search('^\s*[^#\s].*',
                                                                     attrs[(namespaces['xlink'], 'href')])):
                del attrs[(namespaces['xlink'], 'href')]
            if (None, 'style') in attrs:
                attrs[(None, 'style')] = self.sanitize_css(attrs[(None, 'style')])
            token["data"] = attrs
        return token

    def disallowed_token(self, token):
        token_type = token["type"]
        if token_type == "EndTag":
            token["data"] = "</%s>" % token["name"]
        elif token["data"]:
            assert token_type in ("StartTag", "EmptyTag")
            attrs = []
            for (ns, name), v in token["data"].items():
                attrs.append(' %s="%s"' % (name if ns is None else "%s:%s" % (prefixes[ns], name), escape(v)))
            token["data"] = "<%s%s>" % (token["name"], ''.join(attrs))
        else:
            token["data"] = "<%s>" % token["name"]
        if token.get("selfClosing"):
            token["data"] = token["data"][:-1] + "/>"

        token["type"] = "Characters"

        del token["name"]
        return token

    def sanitize_css(self, style):
        # disallow urls
        style = re.compile('url\s*\(\s*[^\s)]+?\s*\)\s*').sub(' ', style)

        # gauntlet
        if not re.match("""^([:,;#%.\sa-zA-Z0-9!]|\w-\w|'[\s\w]+'|"[\s\w]+"|\([\d,\s]+\))*$""", style):
            return ''
        if not re.match("^\s*([-\w]+\s*:[^:;]*(;\s*|$))*$", style):
            return ''

        clean = []
        for prop, value in re.findall("([-\w]+)\s*:\s*([^:;]*)", style):
            if not value:
                continue
            if prop.lower() in self.allowed_css_properties:
                clean.append(prop + ': ' + value + ';')
            elif prop.split('-')[0].lower() in ['background', 'border', 'margin',
                                                'padding']:
                for keyword in value.split():
                    if keyword not in self.allowed_css_keywords and \
                            not re.match("^(#[0-9a-f]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)$", keyword):  # noqa
                        break
                else:
                    clean.append(prop + ': ' + value + ';')
            elif prop.lower() in self.allowed_svg_properties:
                clean.append(prop + ': ' + value + ';')

        return ' '.join(clean)

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