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89 lines
2.5 KiB
89 lines
2.5 KiB
# Copyright 2014 Donald Stufft
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import, division, print_function
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import functools
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import bleach
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import bleach.callbacks
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import bleach.linkifier
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import bleach.sanitizer
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ALLOWED_TAGS = [
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# Bleach Defaults
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"a", "abbr", "acronym", "b", "blockquote", "code", "em", "i", "li", "ol",
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"strong", "ul",
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# Custom Additions
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"br", "caption", "cite", "col", "colgroup", "dd", "del", "details", "div",
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"dl", "dt", "h1", "h2", "h3", "h4", "h5", "h6", "hr", "img", "p", "pre",
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"span", "sub", "summary", "sup", "table", "tbody", "td", "th", "thead",
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"tr", "tt", "kbd", "var",
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]
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ALLOWED_ATTRIBUTES = {
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# Bleach Defaults
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"a": ["href", "title"],
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"abbr": ["title"],
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"acronym": ["title"],
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# Custom Additions
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"*": ["id"],
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"hr": ["class"],
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"img": ["src", "width", "height", "alt", "align", "class"],
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"span": ["class"],
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"th": ["align"],
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"td": ["align"],
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"code": ["class"],
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"p": ["align"],
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}
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ALLOWED_STYLES = [
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]
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def clean(html, tags=None, attributes=None, styles=None):
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if tags is None:
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tags = ALLOWED_TAGS
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if attributes is None:
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attributes = ALLOWED_ATTRIBUTES
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if styles is None:
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styles = ALLOWED_STYLES
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# Clean the output using Bleach
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cleaner = bleach.sanitizer.Cleaner(
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tags=tags,
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attributes=attributes,
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styles=styles,
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filters=[
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# Bleach Linkify makes it easy to modify links, however, we will
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# not be using it to create additional links.
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functools.partial(
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bleach.linkifier.LinkifyFilter,
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callbacks=[
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lambda attrs, new: attrs if not new else None,
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bleach.callbacks.nofollow,
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],
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skip_tags=["pre"],
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parse_email=False,
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),
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],
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)
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try:
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cleaned = cleaner.clean(html)
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return cleaned
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except ValueError:
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return None
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