Source Code for Module nbxmpp.c14n

 1  # -*- coding:utf-8 -*- 
 2  ## c14n.py 
 3  ## 
 4  ## Copyright (C) 2007-2008 Brendan Taylor <whateley AT gmail.com> 
 5  ## 
 6  ## This file is part of Gajim. 
 7  ## 
 8  ## Gajim is free software; you can redistribute it and/or modify 
 9  ## it under the terms of the GNU General Public License as published 
10  ## by the Free Software Foundation; version 3 only. 
11  ## 
12  ## Gajim is distributed in the hope that it will be useful, 
13  ## but WITHOUT ANY WARRANTY; without even the implied warranty of 
14  ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
15  ## GNU General Public License for more details. 
16  ## 
17  ## You should have received a copy of the GNU General Public License 
18  ## along with Gajim. If not, see <http://www.gnu.org/licenses/>. 
19  ## 
20   
21  """ 
22  XML canonicalisation methods (for XEP-0116) 
23  """ 
24   
25  from simplexml import ustr 
26   
27 -def c14n(node, is_buggy): 
28      s = "<" + node.name 
29      if node.namespace: 
30          if not node.parent or node.parent.namespace != node.namespace: 
31              s = s + ' xmlns="%s"' % node.namespace 
32   
33      sorted_attrs = sorted(node.attrs.keys()) 
34      for key in sorted_attrs: 
35          if not is_buggy and key == 'xmlns': 
36              continue 
37          val = ustr(node.attrs[key]) 
38          # like XMLescape() but with whitespace and without &gt; 
39          s = s + ' %s="%s"' % ( key, normalise_attr(val) ) 
40      s = s + ">" 
41      cnt = 0 
42      if node.kids: 
43          for a in node.kids: 
44              if (len(node.data)-1) >= cnt: 
45                  s = s + normalise_text(node.data[cnt]) 
46              s = s + c14n(a, is_buggy) 
47              cnt=cnt+1 
48      if (len(node.data)-1) >= cnt: s = s + normalise_text(node.data[cnt]) 
49      if not node.kids and s.endswith('>'): 
50          s=s[:-1]+' />' 
51      else: 
52          s = s + "</" + node.name + ">" 
53      return s.encode('utf-8') 
54   
55 -def normalise_attr(val): 
56      return val.replace('&', '&amp;').replace('<', '&lt;').replace('"', '&quot;').replace('\t', '&#x9;').replace('\n', '&#xA;').replace('\r', '&#xD;') 
57   
58 -def normalise_text(val): 
59      return val.replace('&', '&amp;').replace('<', '&lt;').replace('>', '&gt;').replace('\r', '&#xD;') 
60