59 lines
2 KiB
Python
59 lines
2 KiB
Python
# -*- coding:utf-8 -*-
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## c14n.py
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##
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## Copyright (C) 2007-2008 Brendan Taylor <whateley AT gmail.com>
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##
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## This file is part of Gajim.
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##
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## Gajim is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published
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## by the Free Software Foundation; version 3 only.
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##
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## Gajim 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 General Public License
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## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
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##
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"""
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XML canonicalisation methods (for XEP-0116)
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"""
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from simplexml import ustr
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def c14n(node, is_buggy):
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s = "<" + node.name
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if node.namespace:
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if not node.parent or node.parent.namespace != node.namespace:
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s = s + ' xmlns="%s"' % node.namespace
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sorted_attrs = sorted(node.attrs.keys())
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for key in sorted_attrs:
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if not is_buggy and key == 'xmlns':
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continue
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val = ustr(node.attrs[key])
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# like XMLescape() but with whitespace and without >
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s = s + ' %s="%s"' % ( key, normalise_attr(val) )
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s = s + ">"
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cnt = 0
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if node.kids:
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for a in node.kids:
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if (len(node.data)-1) >= cnt:
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s = s + normalise_text(node.data[cnt])
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s = s + c14n(a, is_buggy)
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cnt=cnt+1
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if (len(node.data)-1) >= cnt: s = s + normalise_text(node.data[cnt])
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if not node.kids and s.endswith('>'):
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s=s[:-1]+' />'
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else:
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s = s + "</" + node.name + ">"
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return s.encode('utf-8')
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def normalise_attr(val):
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return val.replace('&', '&').replace('<', '<').replace('"', '"').replace('\t', '	').replace('\n', '
').replace('\r', '
')
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def normalise_text(val):
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return val.replace('&', '&').replace('<', '<').replace('>', '>').replace('\r', '
')
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