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# Copyright (C) 2011-2023 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 urllib.parse
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import pycmarkgfm
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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.utils2 import safe_str, 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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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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fromstring = None
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tostring = None
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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_literal_block(self, node):
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self.body.append(self.starttag(node, 'pre', CLASS='codehilite literal-block'))
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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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super(RhodeCodeWriter, self).__init__()
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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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if not fromstring and tostring:
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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, encoding='unicode')
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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_str(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_str(path)
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request_path = safe_str(request_path)
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if path.startswith(('data:', 'javascript:', '#', ':')):
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# skip data, anchor, invalid links
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return path
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is_absolute = bool(urllib.parse.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('/'):
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path = path[1:]
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if path.startswith('./'):
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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('../'):
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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 = '/'.join(parts).lstrip('/')
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return '/' + 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 + ['legacy_attrs'],
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output_format=output_format)
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return _cached_markdown_renderer
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def get_markdown_renderer_flavored(extensions, output_format):
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"""
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Dummy wrapper to mimic markdown API and render github HTML rendered
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"""
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md = get_markdown_renderer(extensions, output_format)
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class GFM(object):
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def convert(self, source):
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with pycmarkgfm.parse_gfm(source, options=pycmarkgfm.options.hardbreaks) as document:
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parsed_md = document.to_commonmark()
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return md.convert(parsed_md)
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return GFM()
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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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MENTION_PAT = re.compile(MENTIONS_REGEX)
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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 sanitize_html(cls, text):
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from .html_filters import sanitize_html
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return sanitize_html(text, markdown=True)
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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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"""
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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 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 f'<a href="{url_full}">{url_full}</a>'
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return cls.URL_PAT.sub(url_func, text)
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@classmethod
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def convert_mentions(cls, text, mode):
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mention_pat = cls.MENTION_PAT
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def wrapp(match_obj):
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uname = match_obj.groups()[0]
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hovercard_url = "pyroutes.url('hovercard_username', {'username': '%s'});" % uname
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if mode == 'markdown':
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tmpl = '<strong class="tooltip-hovercard" data-hovercard-alt="{uname}" data-hovercard-url="{hovercard_url}">@{uname}</strong>'
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elif mode == 'rst':
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tmpl = ' **@{uname}** '
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else:
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raise ValueError('mode must be rst or markdown')
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return tmpl.format(**{'uname': uname,
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'hovercard_url': hovercard_url})
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return mention_pat.sub(wrapp, text).strip()
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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_str(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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rendered = cls.sanitize_html(source)
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return rendered
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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_hl = cls.convert_mentions(source, mode='markdown')
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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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try:
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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.sanitize_html(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_hl = cls.convert_mentions(source, mode='rst')
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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_str(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',
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'report_level': 4,
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'syntax_highlight': 'short',
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})
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for k, v in list(docutils_settings.items()):
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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.sanitize_html(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('Fallback 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 .html_sanitizer_defs import markdown_attrs, all_tags, all_styles
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from traitlets import default, 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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from nbconvert.preprocessors.sanitize import SanitizeHTML
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class CustomHTMLExporter(HTMLExporter):
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@default("template_file")
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def _template_file_default(self):
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if self.template_extension:
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return "basic/index" + self.template_extension
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class Sandbox(Preprocessor):
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def preprocess_cell(self, cell, resources, cell_index):
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if not safe:
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return cell, resources
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sandbox_text = 'SandBoxed(IPython.core.display.Javascript object)'
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if cell.cell_type == "markdown":
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cell.source = cls.sanitize_html(cell.source)
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return cell, resources
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for cell_output in cell.get('outputs', []):
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|
|
if 'data' in cell_output:
|
|
|
if 'application/javascript' in cell_output['data']:
|
|
|
cell_output['data']['text/plain'] = sandbox_text
|
|
|
cell_output['data'].pop('application/javascript', None)
|
|
|
return cell, resources
|
|
|
|
|
|
def _sanitize_resources(input_resources):
|
|
|
"""
|
|
|
Skip/sanitize some of the CSS generated and included in jupyter
|
|
|
so it doesn't mess up UI so much
|
|
|
"""
|
|
|
|
|
|
# TODO(marcink): probably we should replace this with whole custom
|
|
|
# CSS set that doesn't screw up, but jupyter generated html has some
|
|
|
# special markers, so it requires Custom HTML exporter template with
|
|
|
# _default_template_path_default, to achieve that
|
|
|
|
|
|
# strip the reset CSS
|
|
|
input_resources[0] = input_resources[0][input_resources[0].find('/*! Source'):]
|
|
|
return input_resources
|
|
|
|
|
|
def as_html(notebook):
|
|
|
conf = config.Config()
|
|
|
# TODO: Keep an eye on the order of preprocessors
|
|
|
conf.CustomHTMLExporter.default_preprocessors = [Sandbox, SanitizeHTML]
|
|
|
conf.Sandbox.enabled = True
|
|
|
conf.SanitizeHTML.enabled = True
|
|
|
conf.SanitizeHTML.attributes = markdown_attrs
|
|
|
conf.SanitizeHTML.tags = all_tags
|
|
|
conf.SanitizeHTML.styles = all_styles
|
|
|
conf.SanitizeHTML.sanitized_output_types = {
|
|
|
"text/html",
|
|
|
"text/markdown",
|
|
|
}
|
|
|
conf.SanitizeHTML.safe_output_keys = {
|
|
|
"metadata",
|
|
|
"text/plain",
|
|
|
"text/latex",
|
|
|
"application/json",
|
|
|
"image/png",
|
|
|
"image/jpg"
|
|
|
"image/jpeg",
|
|
|
"image/svg",
|
|
|
"image/svg+xml"
|
|
|
}
|
|
|
|
|
|
html_exporter = CustomHTMLExporter(config=conf)
|
|
|
|
|
|
(body, resources) = html_exporter.from_notebook_node(notebook)
|
|
|
|
|
|
header = '<!-- ## IPYTHON NOTEBOOK RENDERING ## -->'
|
|
|
js = MakoTemplate(r'''
|
|
|
<!-- MathJax configuration -->
|
|
|
<script type="text/x-mathjax-config">
|
|
|
MathJax.Hub.Config({
|
|
|
jax: ["input/TeX","output/HTML-CSS", "output/PreviewHTML"],
|
|
|
extensions: ["tex2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
|
|
|
TeX: {
|
|
|
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
|
|
|
},
|
|
|
tex2jax: {
|
|
|
inlineMath: [ ['$','$'], ["\\(","\\)"] ],
|
|
|
displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
|
|
|
processEscapes: true,
|
|
|
processEnvironments: true
|
|
|
},
|
|
|
// Center justify equations in code and markdown cells. Elsewhere
|
|
|
// we use CSS to left justify single line equations in code cells.
|
|
|
displayAlign: 'center',
|
|
|
"HTML-CSS": {
|
|
|
styles: {'.MathJax_Display': {"margin": 0}},
|
|
|
linebreaks: { automatic: true },
|
|
|
availableFonts: ["STIX", "TeX"]
|
|
|
},
|
|
|
showMathMenu: false
|
|
|
});
|
|
|
</script>
|
|
|
<!-- End of MathJax configuration -->
|
|
|
<script src="${h.asset('js/src/math_jax/MathJax.js')}"></script>
|
|
|
''').render(h=helpers)
|
|
|
|
|
|
css = MakoTemplate(r'''
|
|
|
<link rel="stylesheet" type="text/css" href="${h.asset('css/style-ipython.css', ver=ver)}" media="screen"/>
|
|
|
''').render(h=helpers, ver='ver1')
|
|
|
|
|
|
body = '\n'.join([header, css, js, body])
|
|
|
return body, resources
|
|
|
|
|
|
captured_errors = {}
|
|
|
error_body = """
|
|
|
<div style="text-align: center;">
|
|
|
<h3>Invalid Notebook!</h3>
|
|
|
<p>{}</p>
|
|
|
</div>
|
|
|
"""
|
|
|
# TODO: In the event of a newer jupyter notebook version, consider increasing the as_version parameter
|
|
|
notebook = nbformat.reads(source, as_version=4, capture_validation_error=captured_errors)
|
|
|
if captured_errors:
|
|
|
error_messages = '<br>'.join(str(error) for error in captured_errors.values())
|
|
|
body = error_body.format(error_messages)
|
|
|
else:
|
|
|
try:
|
|
|
body, _ = as_html(notebook)
|
|
|
except (AttributeError, nbformat.ValidationError):
|
|
|
try:
|
|
|
nbformat.validate(nbformat.reader.reads(source))
|
|
|
except nbformat.ValidationError as exc:
|
|
|
body = error_body.format(str(exc))
|
|
|
else:
|
|
|
raise
|
|
|
return body
|
|
|
|
|
|
|
|
|
class RstTemplateRenderer(object):
|
|
|
|
|
|
def __init__(self):
|
|
|
base = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
|
|
|
rst_template_dirs = [os.path.join(base, 'templates', 'rst_templates')]
|
|
|
self.template_store = TemplateLookup(
|
|
|
directories=rst_template_dirs,
|
|
|
input_encoding='utf-8',
|
|
|
imports=['from rhodecode.lib import helpers as h'])
|
|
|
|
|
|
def _get_template(self, templatename):
|
|
|
return self.template_store.get_template(templatename)
|
|
|
|
|
|
def render(self, template_name, **kwargs):
|
|
|
template = self._get_template(template_name)
|
|
|
return template.render(**kwargs)
|
|
|
|
