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# -*- coding: utf-8 -*-
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# Copyright (C) 2011-2019 RhodeCode GmbH
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License, version 3
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# (only), as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This program is dual-licensed. If you wish to learn more about the
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# RhodeCode Enterprise Edition, including its added features, Support services,
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# and proprietary license terms, please see https://rhodecode.com/licenses/
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"""
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Renderer for markup languages with ability to parse using rst or markdown
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"""
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import re
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import os
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import lxml
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import logging
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import urlparse
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import bleach
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from mako.lookup import TemplateLookup
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from mako.template import Template as MakoTemplate
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from docutils.core import publish_parts
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from docutils.parsers.rst import directives
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from docutils import writers
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from docutils.writers import html4css1
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import markdown
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from rhodecode.lib.markdown_ext import GithubFlavoredMarkdownExtension
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from rhodecode.lib.utils2 import (safe_unicode, md5_safe, MENTIONS_REGEX)
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log = logging.getLogger(__name__)
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# default renderer used to generate automated comments
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DEFAULT_COMMENTS_RENDERER = 'rst'
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class CustomHTMLTranslator(writers.html4css1.HTMLTranslator):
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"""
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Custom HTML Translator used for sandboxing potential
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JS injections in ref links
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"""
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def visit_reference(self, node):
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if 'refuri' in node.attributes:
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refuri = node['refuri']
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if ':' in refuri:
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prefix, link = refuri.lstrip().split(':', 1)
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prefix = prefix or ''
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if prefix.lower() == 'javascript':
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# we don't allow javascript type of refs...
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node['refuri'] = 'javascript:alert("SandBoxedJavascript")'
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# old style class requires this...
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return html4css1.HTMLTranslator.visit_reference(self, node)
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class RhodeCodeWriter(writers.html4css1.Writer):
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def __init__(self):
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writers.Writer.__init__(self)
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self.translator_class = CustomHTMLTranslator
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def relative_links(html_source, server_paths):
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if not html_source:
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return html_source
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try:
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from lxml.html import fromstring
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from lxml.html import tostring
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except ImportError:
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log.exception('Failed to import lxml')
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return html_source
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try:
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doc = lxml.html.fromstring(html_source)
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except Exception:
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return html_source
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for el in doc.cssselect('img, video'):
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src = el.attrib.get('src')
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if src:
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el.attrib['src'] = relative_path(src, server_paths['raw'])
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for el in doc.cssselect('a:not(.gfm)'):
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src = el.attrib.get('href')
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if src:
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raw_mode = el.attrib['href'].endswith('?raw=1')
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if raw_mode:
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el.attrib['href'] = relative_path(src, server_paths['raw'])
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else:
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el.attrib['href'] = relative_path(src, server_paths['standard'])
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return lxml.html.tostring(doc)
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def relative_path(path, request_path, is_repo_file=None):
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"""
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relative link support, path is a rel path, and request_path is current
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server path (not absolute)
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e.g.
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path = '../logo.png'
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request_path= '/repo/files/path/file.md'
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produces: '/repo/files/logo.png'
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"""
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# TODO(marcink): unicode/str support ?
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# maybe=> safe_unicode(urllib.quote(safe_str(final_path), '/:'))
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def dummy_check(p):
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return True # assume default is a valid file path
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is_repo_file = is_repo_file or dummy_check
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if not path:
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return request_path
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path = safe_unicode(path)
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request_path = safe_unicode(request_path)
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if path.startswith((u'data:', u'javascript:', u'#', u':')):
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# skip data, anchor, invalid links
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return path
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is_absolute = bool(urlparse.urlparse(path).netloc)
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if is_absolute:
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return path
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if not request_path:
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return path
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if path.startswith(u'/'):
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path = path[1:]
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if path.startswith(u'./'):
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path = path[2:]
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parts = request_path.split('/')
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# compute how deep we need to traverse the request_path
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depth = 0
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if is_repo_file(request_path):
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# if request path is a VALID file, we use a relative path with
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# one level up
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depth += 1
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while path.startswith(u'../'):
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depth += 1
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path = path[3:]
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if depth > 0:
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parts = parts[:-depth]
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parts.append(path)
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final_path = u'/'.join(parts).lstrip(u'/')
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return u'/' + final_path
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_cached_markdown_renderer = None
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def get_markdown_renderer(extensions, output_format):
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global _cached_markdown_renderer
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if _cached_markdown_renderer is None:
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_cached_markdown_renderer = markdown.Markdown(
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extensions=extensions,
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enable_attributes=False, output_format=output_format)
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return _cached_markdown_renderer
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_cached_markdown_renderer_flavored = None
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def get_markdown_renderer_flavored(extensions, output_format):
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global _cached_markdown_renderer_flavored
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if _cached_markdown_renderer_flavored is None:
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_cached_markdown_renderer_flavored = markdown.Markdown(
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extensions=extensions + [GithubFlavoredMarkdownExtension()],
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enable_attributes=False, output_format=output_format)
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return _cached_markdown_renderer_flavored
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class MarkupRenderer(object):
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RESTRUCTUREDTEXT_DISALLOWED_DIRECTIVES = ['include', 'meta', 'raw']
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MARKDOWN_PAT = re.compile(r'\.(md|mkdn?|mdown|markdown)$', re.IGNORECASE)
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RST_PAT = re.compile(r'\.re?st$', re.IGNORECASE)
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JUPYTER_PAT = re.compile(r'\.(ipynb)$', re.IGNORECASE)
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PLAIN_PAT = re.compile(r'^readme$', re.IGNORECASE)
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URL_PAT = re.compile(r'(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]'
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r'|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)')
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extensions = ['markdown.extensions.codehilite', 'markdown.extensions.extra',
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'markdown.extensions.def_list', 'markdown.extensions.sane_lists']
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output_format = 'html4'
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# extension together with weights. Lower is first means we control how
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# extensions are attached to readme names with those.
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PLAIN_EXTS = [
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# prefer no extension
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('', 0), # special case that renders READMES names without extension
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('.text', 2), ('.TEXT', 2),
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('.txt', 3), ('.TXT', 3)
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]
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RST_EXTS = [
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('.rst', 1), ('.rest', 1),
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('.RST', 2), ('.REST', 2)
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]
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MARKDOWN_EXTS = [
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('.md', 1), ('.MD', 1),
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('.mkdn', 2), ('.MKDN', 2),
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('.mdown', 3), ('.MDOWN', 3),
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('.markdown', 4), ('.MARKDOWN', 4)
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]
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def _detect_renderer(self, source, filename=None):
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"""
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runs detection of what renderer should be used for generating html
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from a markup language
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filename can be also explicitly a renderer name
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:param source:
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:param filename:
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"""
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if MarkupRenderer.MARKDOWN_PAT.findall(filename):
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detected_renderer = 'markdown'
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elif MarkupRenderer.RST_PAT.findall(filename):
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detected_renderer = 'rst'
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elif MarkupRenderer.JUPYTER_PAT.findall(filename):
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detected_renderer = 'jupyter'
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elif MarkupRenderer.PLAIN_PAT.findall(filename):
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detected_renderer = 'plain'
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else:
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detected_renderer = 'plain'
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return getattr(MarkupRenderer, detected_renderer)
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@classmethod
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def bleach_clean(cls, text):
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from .bleach_whitelist import markdown_attrs, markdown_tags
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allowed_tags = markdown_tags
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allowed_attrs = markdown_attrs
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try:
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return bleach.clean(text, tags=allowed_tags, attributes=allowed_attrs)
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except Exception:
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return 'UNPARSEABLE TEXT'
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@classmethod
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def renderer_from_filename(cls, filename, exclude):
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"""
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Detect renderer markdown/rst from filename and optionally use exclude
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list to remove some options. This is mostly used in helpers.
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Returns None when no renderer can be detected.
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"""
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def _filter(elements):
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if isinstance(exclude, (list, tuple)):
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return [x for x in elements if x not in exclude]
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return elements
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if filename.endswith(
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tuple(_filter([x[0] for x in cls.MARKDOWN_EXTS if x[0]]))):
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return 'markdown'
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if filename.endswith(tuple(_filter([x[0] for x in cls.RST_EXTS if x[0]]))):
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return 'rst'
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return None
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def render(self, source, filename=None):
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"""
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Renders a given filename using detected renderer
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it detects renderers based on file extension or mimetype.
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At last it will just do a simple html replacing new lines with <br/>
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:param file_name:
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:param source:
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"""
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renderer = self._detect_renderer(source, filename)
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readme_data = renderer(source)
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return readme_data
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@classmethod
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def _flavored_markdown(cls, text):
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"""
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Github style flavored markdown
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:param text:
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"""
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# Extract pre blocks.
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extractions = {}
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def pre_extraction_callback(matchobj):
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digest = md5_safe(matchobj.group(0))
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extractions[digest] = matchobj.group(0)
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return "{gfm-extraction-%s}" % digest
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pattern = re.compile(r'<pre>.*?</pre>', re.MULTILINE | re.DOTALL)
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text = re.sub(pattern, pre_extraction_callback, text)
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# Prevent foo_bar_baz from ending up with an italic word in the middle.
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def italic_callback(matchobj):
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s = matchobj.group(0)
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if list(s).count('_') >= 2:
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return s.replace('_', r'\_')
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return s
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text = re.sub(r'^(?! {4}|\t)\w+_\w+_\w[\w_]*', italic_callback, text)
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# Insert pre block extractions.
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def pre_insert_callback(matchobj):
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return '\n\n' + extractions[matchobj.group(1)]
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text = re.sub(r'\{gfm-extraction-([0-9a-f]{32})\}',
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pre_insert_callback, text)
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return text
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@classmethod
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def urlify_text(cls, text):
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def url_func(match_obj):
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url_full = match_obj.groups()[0]
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return '<a href="%(url)s">%(url)s</a>' % ({'url': url_full})
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return cls.URL_PAT.sub(url_func, text)
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@classmethod
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def plain(cls, source, universal_newline=True, leading_newline=True):
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source = safe_unicode(source)
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if universal_newline:
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newline = '\n'
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source = newline.join(source.splitlines())
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rendered_source = cls.urlify_text(source)
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source = ''
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if leading_newline:
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source += '<br />'
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source += rendered_source.replace("\n", '<br />')
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return source
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@classmethod
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def markdown(cls, source, safe=True, flavored=True, mentions=False,
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clean_html=True):
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"""
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returns markdown rendered code cleaned by the bleach library
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"""
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if flavored:
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markdown_renderer = get_markdown_renderer_flavored(
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cls.extensions, cls.output_format)
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else:
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markdown_renderer = get_markdown_renderer(
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cls.extensions, cls.output_format)
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if mentions:
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mention_pat = re.compile(MENTIONS_REGEX)
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def wrapp(match_obj):
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uname = match_obj.groups()[0]
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return ' **@%(uname)s** ' % {'uname': uname}
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mention_hl = mention_pat.sub(wrapp, source).strip()
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# we extracted mentions render with this using Mentions false
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return cls.markdown(mention_hl, safe=safe, flavored=flavored,
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mentions=False)
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source = safe_unicode(source)
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try:
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if flavored:
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source = cls._flavored_markdown(source)
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rendered = markdown_renderer.convert(source)
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except Exception:
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log.exception('Error when rendering Markdown')
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if safe:
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log.debug('Fallback to render in plain mode')
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rendered = cls.plain(source)
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else:
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raise
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if clean_html:
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rendered = cls.bleach_clean(rendered)
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return rendered
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@classmethod
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def rst(cls, source, safe=True, mentions=False, clean_html=False):
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if mentions:
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mention_pat = re.compile(MENTIONS_REGEX)
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def wrapp(match_obj):
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uname = match_obj.groups()[0]
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return ' **@%(uname)s** ' % {'uname': uname}
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mention_hl = mention_pat.sub(wrapp, source).strip()
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# we extracted mentions render with this using Mentions false
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return cls.rst(mention_hl, safe=safe, mentions=False)
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source = safe_unicode(source)
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try:
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docutils_settings = dict(
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[(alias, None) for alias in
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cls.RESTRUCTUREDTEXT_DISALLOWED_DIRECTIVES])
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docutils_settings.update({
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'input_encoding': 'unicode', 'report_level': 4})
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for k, v in docutils_settings.iteritems():
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directives.register_directive(k, v)
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parts = publish_parts(source=source,
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writer=RhodeCodeWriter(),
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settings_overrides=docutils_settings)
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rendered = parts["fragment"]
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if clean_html:
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rendered = cls.bleach_clean(rendered)
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return parts['html_title'] + rendered
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except Exception:
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log.exception('Error when rendering RST')
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if safe:
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log.debug('Fallbacking to render in plain mode')
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return cls.plain(source)
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else:
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raise
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@classmethod
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def jupyter(cls, source, safe=True):
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from rhodecode.lib import helpers
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from traitlets.config import Config
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import nbformat
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from nbconvert import HTMLExporter
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from nbconvert.preprocessors import Preprocessor
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class CustomHTMLExporter(HTMLExporter):
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def _template_file_default(self):
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return 'basic'
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class Sandbox(Preprocessor):
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def preprocess(self, nb, resources):
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sandbox_text = 'SandBoxed(IPython.core.display.Javascript object)'
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for cell in nb['cells']:
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if not safe:
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continue
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if 'outputs' in cell:
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for cell_output in cell['outputs']:
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if 'data' in cell_output:
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if 'application/javascript' in cell_output['data']:
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cell_output['data']['text/plain'] = sandbox_text
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cell_output['data'].pop('application/javascript', None)
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if 'source' in cell and cell['cell_type'] == 'markdown':
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# sanitize similar like in markdown
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cell['source'] = cls.bleach_clean(cell['source'])
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return nb, resources
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def _sanitize_resources(input_resources):
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"""
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Skip/sanitize some of the CSS generated and included in jupyter
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so it doesn't messes up UI so much
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"""
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# TODO(marcink): probably we should replace this with whole custom
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# CSS set that doesn't screw up, but jupyter generated html has some
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# special markers, so it requires Custom HTML exporter template with
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# _default_template_path_default, to achieve that
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# strip the reset CSS
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input_resources[0] = input_resources[0][input_resources[0].find('/*! Source'):]
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return input_resources
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def as_html(notebook):
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conf = Config()
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conf.CustomHTMLExporter.preprocessors = [Sandbox]
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html_exporter = CustomHTMLExporter(config=conf)
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(body, resources) = html_exporter.from_notebook_node(notebook)
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header = '<!-- ## IPYTHON NOTEBOOK RENDERING ## -->'
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js = MakoTemplate(r'''
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<!-- Load mathjax -->
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<!-- MathJax configuration -->
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<script type="text/x-mathjax-config">
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MathJax.Hub.Config({
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jax: ["input/TeX","output/HTML-CSS", "output/PreviewHTML"],
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extensions: ["tex2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
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TeX: {
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extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
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},
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tex2jax: {
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inlineMath: [ ['$','$'], ["\\(","\\)"] ],
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displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
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processEscapes: true,
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processEnvironments: true
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},
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// Center justify equations in code and markdown cells. Elsewhere
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// we use CSS to left justify single line equations in code cells.
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displayAlign: 'center',
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"HTML-CSS": {
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styles: {'.MathJax_Display': {"margin": 0}},
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linebreaks: { automatic: true },
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availableFonts: ["STIX", "TeX"]
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},
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showMathMenu: false
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});
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</script>
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<!-- End of mathjax configuration -->
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<script src="${h.asset('js/src/math_jax/MathJax.js')}"></script>
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''').render(h=helpers)
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css = '<style>{}</style>'.format(
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''.join(_sanitize_resources(resources['inlining']['css'])))
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body = '\n'.join([header, css, js, body])
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return body, resources
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notebook = nbformat.reads(source, as_version=4)
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(body, resources) = as_html(notebook)
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return body
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class RstTemplateRenderer(object):
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def __init__(self):
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base = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
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rst_template_dirs = [os.path.join(base, 'templates', 'rst_templates')]
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self.template_store = TemplateLookup(
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directories=rst_template_dirs,
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input_encoding='utf-8',
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imports=['from rhodecode.lib import helpers as h'])
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def _get_template(self, templatename):
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return self.template_store.get_template(templatename)
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def render(self, template_name, **kwargs):
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template = self._get_template(template_name)
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return template.render(**kwargs)
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