markdown.py
f1661f7efbfemaster

markdown.py
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			"""Bleached Markdown functionality.

			This is for user-generated stuff, like comments.
			"""

			from __future__ import absolute_import

			import bleach
			import CommonMark

			ALLOWED_TAGS = [
			'a',
			'abbr',
			'acronym',
			'b', 'strong',
			'i', 'em',
			'del', 'kbd',
			'dl', 'dt', 'dd',
			'blockquote',
			'code',
			'li', 'ol', 'ul',
			'h1', 'h2', 'h3', 'h4', 'h5', 'h6',
			'p', 'br', 'hr',
			'sup', 'sub', 'strike',
			'img',
			'iframe',
			]

			ALLOWED_ATTRIBUTES = {
			'a': ['href', 'title', 'target'],
			'abbr': ['title'],
			'acronym': ['title'],
			'img': ['src', 'alt', 'width', 'height', 'title'],
			'iframe': ['src', 'width', 'height', 'frameborder', 'allowfullscreen'],
			'*': ['style'],
			}

			ALLOWED_STYLES = [
			'color', 'font-weight', 'background-color',
			]


			def markdown(s):
			tainted_html = CommonMark.commonmark(s)
			safe_html = bleach.clean(tainted_html,
			tags=ALLOWED_TAGS,
			attributes=ALLOWED_ATTRIBUTES,
			styles=ALLOWED_STYLES)
			return safe_html