218 lines
9.2 KiB
Python
218 lines
9.2 KiB
Python
from __future__ import unicode_literals
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import frappe
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import json
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import re
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import bleach
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import bleach_whitelist.bleach_whitelist as bleach_whitelist
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from six import string_types
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from bs4 import BeautifulSoup
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def clean_html(html):
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if not isinstance(html, string_types):
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return html
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return bleach.clean(clean_script_and_style(html),
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tags=['div', 'p', 'br', 'ul', 'ol', 'li', 'strong', 'b', 'em', 'i', 'u',
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'table', 'thead', 'tbody', 'td', 'tr'],
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attributes=[],
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styles=['color', 'border', 'border-color'],
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strip=True, strip_comments=True)
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def clean_email_html(html):
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if not isinstance(html, string_types):
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return html
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return bleach.clean(clean_script_and_style(html),
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tags=['div', 'p', 'br', 'ul', 'ol', 'li', 'strong', 'b', 'em', 'i', 'u', 'a',
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'table', 'thead', 'tbody', 'td', 'tr', 'th', 'pre', 'code',
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'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'button', 'img'],
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attributes=['border', 'colspan', 'rowspan',
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'src', 'href', 'style', 'id'],
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styles=['color', 'border-color', 'width', 'height', 'max-width',
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'background-color', 'border-collapse', 'border-radius',
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'border', 'border-top', 'border-bottom', 'border-left', 'border-right',
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'margin', 'margin-top', 'margin-bottom', 'margin-left', 'margin-right',
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'padding', 'padding-top', 'padding-bottom', 'padding-left', 'padding-right',
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'font-size', 'font-weight', 'font-family', 'text-decoration',
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'line-height', 'text-align', 'vertical-align'
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],
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protocols=['cid', 'http', 'https', 'mailto', 'data'],
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strip=True, strip_comments=True)
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def clean_script_and_style(html):
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# remove script and style
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soup = BeautifulSoup(html, 'html5lib')
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for s in soup(['script', 'style']):
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s.decompose()
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return frappe.as_unicode(soup)
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def sanitize_html(html, linkify=False):
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"""
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Sanitize HTML tags, attributes and style to prevent XSS attacks
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Based on bleach clean, bleach whitelist and html5lib's Sanitizer defaults
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Does not sanitize JSON, as it could lead to future problems
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"""
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if not isinstance(html, string_types):
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return html
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elif is_json(html):
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return html
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if not bool(BeautifulSoup(html, 'html.parser').find()):
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return html
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tags = (acceptable_elements + svg_elements + mathml_elements
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+ ["html", "head", "meta", "link", "body", "style", "o:p"])
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attributes = {"*": acceptable_attributes, 'svg': svg_attributes}
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styles = bleach_whitelist.all_styles
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strip_comments = False
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# returns html with escaped tags, escaped orphan >, <, etc.
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escaped_html = bleach.clean(html, tags=tags, attributes=attributes, styles=styles,
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strip_comments=strip_comments, protocols=['cid', 'http', 'https', 'mailto'])
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return escaped_html
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def is_json(text):
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try:
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json.loads(text)
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except ValueError:
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return False
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else:
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return True
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def get_icon_html(icon, small=False):
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from frappe.utils import is_image
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emoji_pattern = re.compile(
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u"(\ud83d[\ude00-\ude4f])|"
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u"(\ud83c[\udf00-\uffff])|"
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u"(\ud83d[\u0000-\uddff])|"
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u"(\ud83d[\ude80-\udeff])|"
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u"(\ud83c[\udde0-\uddff])"
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"+", flags=re.UNICODE)
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icon = icon or ""
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if icon and emoji_pattern.match(icon):
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return '<span class="text-muted">' + icon + '</span>'
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if is_image(icon):
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return \
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'<img style="width: 16px; height: 16px;" src="{icon}">'.format(icon=icon) \
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if small else \
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'<img src="{icon}">'.format(icon=icon)
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else:
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return "<i class='{icon}'></i>".format(icon=icon)
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def unescape_html(value):
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from six.moves.html_parser import HTMLParser
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h = HTMLParser()
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return h.unescape(value)
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# adapted from https://raw.githubusercontent.com/html5lib/html5lib-python/4aa79f113e7486c7ec5d15a6e1777bfe546d3259/html5lib/sanitizer.py
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acceptable_elements = [
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'a', 'abbr', 'acronym', 'address', 'area',
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'article', 'aside', 'audio', 'b', 'big', 'blockquote', 'br', 'button',
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'canvas', 'caption', 'center', 'cite', 'code', 'col', 'colgroup',
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'command', 'datagrid', 'datalist', 'dd', 'del', 'details', 'dfn',
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'dialog', 'dir', 'div', 'dl', 'dt', 'em', 'event-source', 'fieldset',
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'figcaption', 'figure', 'footer', 'font', 'form', 'header', 'h1',
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'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'img', 'input', 'ins',
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'keygen', 'kbd', 'label', 'legend', 'li', 'm', 'map', 'menu', 'meter',
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'multicol', 'nav', 'nextid', 'ol', 'output', 'optgroup', 'option',
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'p', 'pre', 'progress', 'q', 's', 'samp', 'section', 'select',
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'small', 'sound', 'source', 'spacer', 'span', 'strike', 'strong',
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'sub', 'sup', 'table', 'tbody', 'td', 'textarea', 'time', 'tfoot',
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'th', 'thead', 'tr', 'tt', 'u', 'ul', 'var', 'video'
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]
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mathml_elements = [
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'maction', 'math', 'merror', 'mfrac', 'mi',
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'mmultiscripts', 'mn', 'mo', 'mover', 'mpadded', 'mphantom',
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'mprescripts', 'mroot', 'mrow', 'mspace', 'msqrt', 'mstyle', 'msub',
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'msubsup', 'msup', 'mtable', 'mtd', 'mtext', 'mtr', 'munder',
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'munderover', 'none'
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]
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svg_elements = [
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'a', 'animate', 'animateColor', 'animateMotion',
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'animateTransform', 'clipPath', 'circle', 'defs', 'desc', 'ellipse',
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'font-face', 'font-face-name', 'font-face-src', 'g', 'glyph', 'hkern',
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'linearGradient', 'line', 'marker', 'metadata', 'missing-glyph',
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'mpath', 'path', 'polygon', 'polyline', 'radialGradient', 'rect',
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'set', 'stop', 'svg', 'switch', 'text', 'title', 'tspan', 'use'
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]
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acceptable_attributes = [
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'abbr', 'accept', 'accept-charset', 'accesskey',
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'action', 'align', 'alt', 'autocomplete', 'autofocus', 'axis',
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'background', 'balance', 'bgcolor', 'bgproperties', 'border',
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'bordercolor', 'bordercolordark', 'bordercolorlight', 'bottompadding',
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'cellpadding', 'cellspacing', 'ch', 'challenge', 'char', 'charoff',
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'choff', 'charset', 'checked', 'cite', 'class', 'clear', 'color',
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'cols', 'colspan', 'compact', 'contenteditable', 'controls', 'coords',
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'data', 'datafld', 'datapagesize', 'datasrc', 'datetime', 'default',
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'delay', 'dir', 'disabled', 'draggable', 'dynsrc', 'enctype', 'end',
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'face', 'for', 'form', 'frame', 'galleryimg', 'gutter', 'headers',
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'height', 'hidefocus', 'hidden', 'high', 'href', 'hreflang', 'hspace',
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'icon', 'id', 'inputmode', 'ismap', 'keytype', 'label', 'leftspacing',
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'lang', 'list', 'longdesc', 'loop', 'loopcount', 'loopend',
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'loopstart', 'low', 'lowsrc', 'max', 'maxlength', 'media', 'method',
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'min', 'multiple', 'name', 'nohref', 'noshade', 'nowrap', 'open',
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'optimum', 'pattern', 'ping', 'point-size', 'poster', 'pqg', 'preload',
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'prompt', 'radiogroup', 'readonly', 'rel', 'repeat-max', 'repeat-min',
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'replace', 'required', 'rev', 'rightspacing', 'rows', 'rowspan',
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'rules', 'scope', 'selected', 'shape', 'size', 'span', 'src', 'start',
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'step', 'style', 'summary', 'suppress', 'tabindex', 'target',
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'template', 'title', 'toppadding', 'type', 'unselectable', 'usemap',
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'urn', 'valign', 'value', 'variable', 'volume', 'vspace', 'vrml',
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'width', 'wrap', 'xml:lang', 'data-row', 'data-list', 'data-language',
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'data-value', 'role', 'frameborder', 'allowfullscreen', 'spellcheck',
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'data-mode', 'data-gramm', 'data-placeholder', 'data-comment',
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'data-id', 'data-denotation-char', 'itemprop', 'itemscope',
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'itemtype', 'itemid', 'itemref', 'datetime'
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]
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mathml_attributes = [
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'actiontype', 'align', 'columnalign', 'columnalign',
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'columnalign', 'columnlines', 'columnspacing', 'columnspan', 'depth',
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'display', 'displaystyle', 'equalcolumns', 'equalrows', 'fence',
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'fontstyle', 'fontweight', 'frame', 'height', 'linethickness', 'lspace',
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'mathbackground', 'mathcolor', 'mathvariant', 'mathvariant', 'maxsize',
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'minsize', 'other', 'rowalign', 'rowalign', 'rowalign', 'rowlines',
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'rowspacing', 'rowspan', 'rspace', 'scriptlevel', 'selection',
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'separator', 'stretchy', 'width', 'width', 'xlink:href', 'xlink:show',
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'xlink:type', 'xmlns', 'xmlns:xlink'
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]
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svg_attributes = [
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'accent-height', 'accumulate', 'additive', 'alphabetic',
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'arabic-form', 'ascent', 'attributeName', 'attributeType',
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'baseProfile', 'bbox', 'begin', 'by', 'calcMode', 'cap-height',
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'class', 'clip-path', 'color', 'color-rendering', 'content', 'cx',
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'cy', 'd', 'dx', 'dy', 'descent', 'display', 'dur', 'end', 'fill',
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'fill-opacity', 'fill-rule', 'font-family', 'font-size',
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'font-stretch', 'font-style', 'font-variant', 'font-weight', 'from',
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'fx', 'fy', 'g1', 'g2', 'glyph-name', 'gradientUnits', 'hanging',
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'height', 'horiz-adv-x', 'horiz-origin-x', 'id', 'ideographic', 'k',
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'keyPoints', 'keySplines', 'keyTimes', 'lang', 'marker-end',
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'marker-mid', 'marker-start', 'markerHeight', 'markerUnits',
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'markerWidth', 'mathematical', 'max', 'min', 'name', 'offset',
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'opacity', 'orient', 'origin', 'overline-position',
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'overline-thickness', 'panose-1', 'path', 'pathLength', 'points',
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'preserveAspectRatio', 'r', 'refX', 'refY', 'repeatCount',
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'repeatDur', 'requiredExtensions', 'requiredFeatures', 'restart',
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'rotate', 'rx', 'ry', 'slope', 'stemh', 'stemv', 'stop-color',
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'stop-opacity', 'strikethrough-position', 'strikethrough-thickness',
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'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap',
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'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity',
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'stroke-width', 'systemLanguage', 'target', 'text-anchor', 'to',
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'transform', 'type', 'u1', 'u2', 'underline-position',
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'underline-thickness', 'unicode', 'unicode-range', 'units-per-em',
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'values', 'version', 'viewBox', 'visibility', 'width', 'widths', 'x',
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'x-height', 'x1', 'x2', 'xlink:actuate', 'xlink:arcrole',
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'xlink:href', 'xlink:role', 'xlink:show', 'xlink:title', 'xlink:type',
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'xml:base', 'xml:lang', 'xml:space', 'xmlns', 'xmlns:xlink', 'y',
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'y1', 'y2', 'zoomAndPan'
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]
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