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76 lines
2.2 KiB
76 lines
2.2 KiB
# -*- encoding: utf-8 -*-
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from __future__ import unicode_literals
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import pkg_resources
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from distutils.version import LooseVersion as Version
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import bleach
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import misaka
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class Sanitizer(object):
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def __init__(self, elements, attributes):
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# attributes found in Sundown's HTML serializer [1]
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# except for <img> tag,
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# because images are not generated anyways.
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#
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# [1] https://github.com/vmg/sundown/blob/master/html/html.c
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self.elements = ["a", "p", "hr", "br", "ol", "ul", "li",
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"pre", "code", "blockquote",
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"del", "ins", "strong", "em",
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"h1", "h2", "h3", "h4", "h5", "h6",
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"table", "thead", "tbody", "th", "td"] + elements
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# href for <a> and align for <table>
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self.attributes = ["align", "href"] + attributes
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def sanitize(self, text):
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return bleach.clean(text, tags=self.elements,
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attributes=self.attributes, strip=True)
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def Markdown(extensions=("strikethrough", "superscript", "autolink",
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"fenced-code")):
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renderer = Unofficial()
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md = misaka.Markdown(renderer, extensions=extensions)
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def inner(text):
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rv = md(text).rstrip("\n")
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if rv.startswith("<p>") or rv.endswith("</p>"):
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return rv
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return "<p>" + rv + "</p>"
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return inner
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class Unofficial(misaka.HtmlRenderer):
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"""A few modifications to process "common" Markdown.
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For instance, fenced code blocks (~~~ or ```) are just wrapped in <code>
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which does not preserve line breaks. If a language is given, it is added
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to <code class="$lang">, compatible with Highlight.js.
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"""
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def blockcode(self, text, lang):
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lang = ' class="{0}"'.format(lang) if lang else ''
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return "<pre><code{1}>{0}</code></pre>\n".format(text, lang)
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class Markup(object):
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def __init__(self, conf):
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parser = Markdown(conf.getlist("options"))
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sanitizer = Sanitizer(
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conf.getlist("allowed-elements"),
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conf.getlist("allowed-attributes"))
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self._render = lambda text: sanitizer.sanitize(parser(text))
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def render(self, text):
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return self._render(text)
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