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# parse.py - module for reading PSKC files
# coding: utf-8
#
# Copyright (C) 2014 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 PSKC files.
This module provides some utility functions for parsing PSKC files.
"""
# 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#',
)
def findall(tree, match):
"""Find a child element (or None)."""
return tree.findall(match, namespaces=namespaces)
def find(tree, match):
"""Find a child element (or None)."""
try:
return iter(findall(tree, match)).next()
except StopIteration:
return None
def findtext(tree, match):
"""Get the text value of an element (or None)."""
element = find(tree, match)
if element is not None:
return element.text.strip()
def findint(tree, match):
"""Return an element value as an int (or None)."""
value = findtext(tree, match)
if value:
return int(value)
def findtime(tree, match):
"""Return an element value as a datetime (or None)."""
value = findtext(tree, match)
if value:
import dateutil.parser
return dateutil.parser.parse(value)
def findbin(tree, match):
"""Return the binary element value base64 decoded."""
value = findtext(tree, match)
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'
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