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ScoDoc/app/scodoc/safehtml.py

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# -*- mode: python -*-
# -*- coding: utf-8 -*-
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##############################################################################
#
# Gestion scolarite IUT
#
# Copyright (c) 1999 - 2021 Emmanuel Viennet. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Emmanuel Viennet emmanuel.viennet@viennet.net
#
##############################################################################
from html.parser import HTMLParser
"""HTML sanitizing function
used to clean user submitted HTML
(Python 3 only)
"""
# permet de conserver les liens
def html_to_safe_html(text, convert_br=True): # was HTML2SafeHTML
# text = html_to_safe_html(text, valid_tags=("b", "a", "i", "br", "p"))
# New version (jul 2021) with our own parser
text = convert_html_to_text(text)
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if convert_br:
return newline_to_br(text)
else:
return text
def convert_html_to_text(s):
parser = HTMLSanitizer()
parser.feed(s)
return parser.text
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def newline_to_br(text):
return text.replace("\n", "<br/>")
class HTMLSanitizer(HTMLParser):
def __init__(self, allowed_tags=("i", "b", "em", "br", "p"), **kwargs):
super(HTMLSanitizer, self).__init__(**kwargs)
self.allowed_tags = set(allowed_tags)
self.text = ""
def handle_starttag(self, tag, attrs):
if tag in self.allowed_tags:
self.text += "<{} {}>".format(
tag, ", ".join(['{}="{}"'.format(k, v) for (k, v) in attrs])
)
def handle_endtag(self, tag):
if tag in self.allowed_tags:
self.text += "</" + tag + ">"
def handle_data(self, data):
self.text += data
if __name__ == "__main__":
test_parser = HTMLSanitizer()
test_parser.feed("""<p>Hello world <b z="1" >gras</b> <i a="2">italique</i></p>""")
print(test_parser.text)