/usr/lib/python3/dist-packages/pskc/xml.py is in python3-pskc 0.3-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 | # xml.py - module for parsing and writing XML for PSKC files
# coding: utf-8
#
# Copyright (C) 2014-2015 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""Module for parsing XML in PSKC files.
This module provides some utility functions for parsing XML files.
"""
from __future__ import absolute_import
# try to find a usable ElementTree module
try:
from lxml import etree
except ImportError: # pragma: no cover (different implementations)
import xml.etree.ElementTree as etree
# the relevant XML namespaces for PSKC
namespaces = dict(
# the XML namespace URI for version 1.0 of PSKC
pskc='urn:ietf:params:xml:ns:keyprov:pskc',
# the XML Signature namespace
ds='http://www.w3.org/2000/09/xmldsig#',
# the XML Encryption namespace
xenc='http://www.w3.org/2001/04/xmlenc#',
# the XML Encryption version 1.1 namespace
xenc11='http://www.w3.org/2009/xmlenc11#',
# the PKCS #5 namespace
pkcs5='http://www.rsasecurity.com/rsalabs/pkcs/schemas/pkcs-5v2-0#',
)
# register the namespaces so the correct short names will be used
for ns, namespace in namespaces.items():
etree.register_namespace(ns, namespace)
def parse(source):
"""Parse the provided file and return an element tree."""
return etree.parse(source)
def findall(tree, match):
"""Find the child elements."""
return tree.findall(match, namespaces=namespaces)
def find(tree, *matches):
"""Find a child element that matches any of the patterns (or None)."""
for match in matches:
try:
return next(iter(findall(tree, match)))
except StopIteration:
pass
def findtext(tree, *matches):
"""Get the text value of an element (or None)."""
element = find(tree, *matches)
if element is not None:
return element.text.strip()
def findint(tree, *matches):
"""Return an element value as an int (or None)."""
value = findtext(tree, *matches)
if value:
return int(value)
def findtime(tree, *matches):
"""Return an element value as a datetime (or None)."""
value = findtext(tree, *matches)
if value:
import dateutil.parser
return dateutil.parser.parse(value)
def findbin(tree, *matches):
"""Return the binary element value base64 decoded."""
value = findtext(tree, *matches)
if value:
import base64
return base64.b64decode(value)
def getint(tree, attribute):
"""Return an attribute value as an integer (or None)."""
value = tree.get(attribute)
if value:
return int(value)
def getbool(tree, attribute):
"""Return an attribute value as a boolean (or None)."""
value = tree.get(attribute)
if value:
return value.lower() == 'true'
def _format(value):
import datetime
if isinstance(value, datetime.datetime):
value = value.isoformat()
if value.endswith('+00:00'):
value = value[:-6] + 'Z'
return value
elif value is True:
return 'true'
elif value is False:
return 'false'
return str(value)
def mk_elem(parent, tag=None, text=None, empty=False, **kwargs):
"""Add element as a child of parent."""
# special-case the top-level element
if tag is None:
tag = parent
parent = None
empty = True
# don't create empty elements
if not empty and text is None and \
all(x is None for x in kwargs.values()):
return
# replace namespace identifier with URL
if ':' in tag:
ns, name = tag.split(':', 1)
tag = '{%s}%s' % (namespaces[ns], name)
if parent is None:
element = etree.Element(tag)
else:
element = etree.SubElement(parent, tag)
# set text of element
if text is not None:
element.text = _format(text)
# set kwargs as attributes
for k, v in kwargs.items():
if v is not None:
element.set(k, _format(v))
return element
def tostring(element):
"""Return a serialised XML document for the element tree."""
from xml.dom import minidom
xml = etree.tostring(element, encoding='UTF-8')
return minidom.parseString(xml).toprettyxml(
indent=' ', encoding='UTF-8').strip()
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