diff options
Diffstat (limited to 'jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/html5lib/sanitizer.py')
| -rw-r--r-- | jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/html5lib/sanitizer.py | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/html5lib/sanitizer.py b/jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/html5lib/sanitizer.py new file mode 100644 index 0000000..71dc521 --- /dev/null +++ b/jython-tosca-parser/src/main/resources/Lib/site-packages/pip/_vendor/html5lib/sanitizer.py @@ -0,0 +1,271 @@ +from __future__ import absolute_import, division, unicode_literals + +import re +from xml.sax.saxutils import escape, unescape + +from .tokenizer import HTMLTokenizer +from .constants import tokenTypes + + +class HTMLSanitizerMixin(object): + """ sanitization of XHTML+MathML+SVG and of inline style attributes.""" + + acceptable_elements = ['a', 'abbr', 'acronym', 'address', 'area', + 'article', 'aside', 'audio', 'b', 'big', 'blockquote', 'br', 'button', + 'canvas', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', + 'command', 'datagrid', 'datalist', 'dd', 'del', 'details', 'dfn', + 'dialog', 'dir', 'div', 'dl', 'dt', 'em', 'event-source', 'fieldset', + 'figcaption', 'figure', 'footer', 'font', 'form', 'header', 'h1', + 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'img', 'input', 'ins', + 'keygen', 'kbd', 'label', 'legend', 'li', 'm', 'map', 'menu', 'meter', + 'multicol', 'nav', 'nextid', 'ol', 'output', 'optgroup', 'option', + 'p', 'pre', 'progress', 'q', 's', 'samp', 'section', 'select', + 'small', 'sound', 'source', 'spacer', 'span', 'strike', 'strong', + 'sub', 'sup', 'table', 'tbody', 'td', 'textarea', 'time', 'tfoot', + 'th', 'thead', 'tr', 'tt', 'u', 'ul', 'var', 'video'] + + mathml_elements = ['maction', 'math', 'merror', 'mfrac', 'mi', + 'mmultiscripts', 'mn', 'mo', 'mover', 'mpadded', 'mphantom', + 'mprescripts', 'mroot', 'mrow', 'mspace', 'msqrt', 'mstyle', 'msub', + 'msubsup', 'msup', 'mtable', 'mtd', 'mtext', 'mtr', 'munder', + 'munderover', 'none'] + + svg_elements = ['a', 'animate', 'animateColor', 'animateMotion', + 'animateTransform', 'clipPath', 'circle', 'defs', 'desc', 'ellipse', + 'font-face', 'font-face-name', 'font-face-src', 'g', 'glyph', 'hkern', + 'linearGradient', 'line', 'marker', 'metadata', 'missing-glyph', + 'mpath', 'path', 'polygon', 'polyline', 'radialGradient', 'rect', + 'set', 'stop', 'svg', 'switch', 'text', 'title', 'tspan', 'use'] + + acceptable_attributes = ['abbr', 'accept', 'accept-charset', 'accesskey', + 'action', 'align', 'alt', 'autocomplete', 'autofocus', 'axis', + 'background', 'balance', 'bgcolor', 'bgproperties', 'border', + 'bordercolor', 'bordercolordark', 'bordercolorlight', 'bottompadding', + 'cellpadding', 'cellspacing', 'ch', 'challenge', 'char', 'charoff', + 'choff', 'charset', 'checked', 'cite', 'class', 'clear', 'color', + 'cols', 'colspan', 'compact', 'contenteditable', 'controls', 'coords', + 'data', 'datafld', 'datapagesize', 'datasrc', 'datetime', 'default', + 'delay', 'dir', 'disabled', 'draggable', 'dynsrc', 'enctype', 'end', + 'face', 'for', 'form', 'frame', 'galleryimg', 'gutter', 'headers', + 'height', 'hidefocus', 'hidden', 'high', 'href', 'hreflang', 'hspace', + 'icon', 'id', 'inputmode', 'ismap', 'keytype', 'label', 'leftspacing', + 'lang', 'list', 'longdesc', 'loop', 'loopcount', 'loopend', + 'loopstart', 'low', 'lowsrc', 'max', 'maxlength', 'media', 'method', + 'min', 'multiple', 'name', 'nohref', 'noshade', 'nowrap', 'open', + 'optimum', 'pattern', 'ping', 'point-size', 'poster', 'pqg', 'preload', + 'prompt', 'radiogroup', 'readonly', 'rel', 'repeat-max', 'repeat-min', + 'replace', 'required', 'rev', 'rightspacing', 'rows', 'rowspan', + 'rules', 'scope', 'selected', 'shape', 'size', 'span', 'src', 'start', + 'step', 'style', 'summary', 'suppress', 'tabindex', 'target', + 'template', 'title', 'toppadding', 'type', 'unselectable', 'usemap', + 'urn', 'valign', 'value', 'variable', 'volume', 'vspace', 'vrml', + 'width', 'wrap', 'xml:lang'] + + mathml_attributes = ['actiontype', 'align', 'columnalign', 'columnalign', + 'columnalign', 'columnlines', 'columnspacing', 'columnspan', 'depth', + 'display', 'displaystyle', 'equalcolumns', 'equalrows', 'fence', + 'fontstyle', 'fontweight', 'frame', 'height', 'linethickness', 'lspace', + 'mathbackground', 'mathcolor', 'mathvariant', 'mathvariant', 'maxsize', + 'minsize', 'other', 'rowalign', 'rowalign', 'rowalign', 'rowlines', + 'rowspacing', 'rowspan', 'rspace', 'scriptlevel', 'selection', + 'separator', 'stretchy', 'width', 'width', 'xlink:href', 'xlink:show', + 'xlink:type', 'xmlns', 'xmlns:xlink'] + + svg_attributes = ['accent-height', 'accumulate', 'additive', 'alphabetic', + 'arabic-form', 'ascent', 'attributeName', 'attributeType', + 'baseProfile', 'bbox', 'begin', 'by', 'calcMode', 'cap-height', + 'class', 'clip-path', 'color', 'color-rendering', 'content', 'cx', + 'cy', 'd', 'dx', 'dy', 'descent', 'display', 'dur', 'end', 'fill', + 'fill-opacity', 'fill-rule', 'font-family', 'font-size', + 'font-stretch', 'font-style', 'font-variant', 'font-weight', 'from', + 'fx', 'fy', 'g1', 'g2', 'glyph-name', 'gradientUnits', 'hanging', + 'height', 'horiz-adv-x', 'horiz-origin-x', 'id', 'ideographic', 'k', + 'keyPoints', 'keySplines', 'keyTimes', 'lang', 'marker-end', + 'marker-mid', 'marker-start', 'markerHeight', 'markerUnits', + 'markerWidth', 'mathematical', 'max', 'min', 'name', 'offset', + 'opacity', 'orient', 'origin', 'overline-position', + 'overline-thickness', 'panose-1', 'path', 'pathLength', 'points', + 'preserveAspectRatio', 'r', 'refX', 'refY', 'repeatCount', + 'repeatDur', 'requiredExtensions', 'requiredFeatures', 'restart', + 'rotate', 'rx', 'ry', 'slope', 'stemh', 'stemv', 'stop-color', + 'stop-opacity', 'strikethrough-position', 'strikethrough-thickness', + 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', + 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', + 'stroke-width', 'systemLanguage', 'target', 'text-anchor', 'to', + 'transform', 'type', 'u1', 'u2', 'underline-position', + 'underline-thickness', 'unicode', 'unicode-range', 'units-per-em', + 'values', 'version', 'viewBox', 'visibility', 'width', 'widths', 'x', + 'x-height', 'x1', 'x2', 'xlink:actuate', 'xlink:arcrole', + 'xlink:href', 'xlink:role', 'xlink:show', 'xlink:title', 'xlink:type', + 'xml:base', 'xml:lang', 'xml:space', 'xmlns', 'xmlns:xlink', 'y', + 'y1', 'y2', 'zoomAndPan'] + + attr_val_is_uri = ['href', 'src', 'cite', 'action', 'longdesc', 'poster', + 'xlink:href', 'xml:base'] + + svg_attr_val_allows_ref = ['clip-path', 'color-profile', 'cursor', 'fill', + 'filter', 'marker', 'marker-start', 'marker-mid', 'marker-end', + 'mask', 'stroke'] + + svg_allow_local_href = ['altGlyph', 'animate', 'animateColor', + 'animateMotion', 'animateTransform', 'cursor', 'feImage', 'filter', + 'linearGradient', 'pattern', 'radialGradient', 'textpath', 'tref', + 'set', 'use'] + + acceptable_css_properties = ['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'] + + acceptable_css_keywords = ['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'] + + acceptable_svg_properties = ['fill', 'fill-opacity', 'fill-rule', + 'stroke', 'stroke-width', 'stroke-linecap', 'stroke-linejoin', + 'stroke-opacity'] + + acceptable_protocols = ['ed2k', 'ftp', 'http', 'https', 'irc', + 'mailto', 'news', 'gopher', 'nntp', 'telnet', 'webcal', + 'xmpp', 'callto', 'feed', 'urn', 'aim', 'rsync', 'tag', + 'ssh', 'sftp', 'rtsp', 'afs'] + + # subclasses may define their own versions of these constants + allowed_elements = acceptable_elements + mathml_elements + svg_elements + allowed_attributes = acceptable_attributes + mathml_attributes + svg_attributes + allowed_css_properties = acceptable_css_properties + allowed_css_keywords = acceptable_css_keywords + allowed_svg_properties = acceptable_svg_properties + allowed_protocols = acceptable_protocols + + # 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>') + # => <script> do_nasty_stuff() </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 list(tokenTypes.keys()): + token_type = tokenTypes[token_type] + + if token_type in (tokenTypes["StartTag"], tokenTypes["EndTag"], + tokenTypes["EmptyTag"]): + if token["name"] in self.allowed_elements: + return self.allowed_token(token, token_type) + else: + return self.disallowed_token(token, token_type) + elif token_type == tokenTypes["Comment"]: + pass + else: + return token + + def allowed_token(self, token, token_type): + if "data" in token: + attrs = dict([(name, val) for name, val in + token["data"][::-1] + if name in self.allowed_attributes]) + for attr in self.attr_val_is_uri: + if attr not in attrs: + continue + val_unescaped = re.sub("[`\000-\040\177-\240\s]+", '', + unescape(attrs[attr])).lower() + # remove replacement characters from unescaped characters + val_unescaped = val_unescaped.replace("\ufffd", "") + if (re.match("^[a-z0-9][-+.a-z0-9]*:", val_unescaped) and + (val_unescaped.split(':')[0] not in + self.allowed_protocols)): + 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 + 'xlink:href' in attrs and re.search('^\s*[^#\s].*', + attrs['xlink:href'])): + del attrs['xlink:href'] + if 'style' in attrs: + attrs['style'] = self.sanitize_css(attrs['style']) + token["data"] = [[name, val] for name, val in list(attrs.items())] + return token + + def disallowed_token(self, token, token_type): + if token_type == tokenTypes["EndTag"]: + token["data"] = "</%s>" % token["name"] + elif token["data"]: + attrs = ''.join([' %s="%s"' % (k, escape(v)) for k, v in token["data"]]) + token["data"] = "<%s%s>" % (token["name"], attrs) + else: + token["data"] = "<%s>" % token["name"] + if token.get("selfClosing"): + token["data"] = token["data"][:-1] + "/>" + + if token["type"] in list(tokenTypes.keys()): + token["type"] = "Characters" + else: + token["type"] = tokenTypes["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 not keyword in self.acceptable_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): + break + else: + clean.append(prop + ': ' + value + ';') + elif prop.lower() in self.allowed_svg_properties: + clean.append(prop + ': ' + value + ';') + + return ' '.join(clean) + + +class HTMLSanitizer(HTMLTokenizer, HTMLSanitizerMixin): + def __init__(self, stream, encoding=None, parseMeta=True, useChardet=True, + lowercaseElementName=False, lowercaseAttrName=False, parser=None): + # Change case matching defaults as we only output lowercase html anyway + # This solution doesn't seem ideal... + HTMLTokenizer.__init__(self, stream, encoding, parseMeta, useChardet, + lowercaseElementName, lowercaseAttrName, parser=parser) + + def __iter__(self): + for token in HTMLTokenizer.__iter__(self): + token = self.sanitize_token(token) + if token: + yield token |