90 lines
3 KiB
Python
90 lines
3 KiB
Python
# -*- coding: utf-8 -*-
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from xml.etree import cElementTree
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from xml.etree.cElementTree import ParseError
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if hasattr(cElementTree, 'ParseError'):
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_ETREE_EXCEPTIONS = (ParseError, AttributeError, ValueError, TypeError)
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else:
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_ETREE_EXCEPTIONS = (SyntaxError, AttributeError, ValueError, TypeError)
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_STS_NS = {'sts': 'https://sts.amazonaws.com/doc/2011-06-15/'}
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class STSElement(object):
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"""STS aware XML parsing class. Wraps a root element name and
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cElementTree.Element instance. Provides STS namespace aware parsing
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functions.
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"""
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def __init__(self, root_name, element):
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self.root_name = root_name
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self.element = element
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@classmethod
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def fromstring(cls, root_name, data):
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"""Initialize STSElement from name and XML string data.
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:param name: Name for XML data. Used in XML errors.
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:param data: string data to be parsed.
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:return: Returns an STSElement.
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"""
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try:
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return cls(root_name, cElementTree.fromstring(data))
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except _ETREE_EXCEPTIONS as error:
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raise InvalidXMLError(
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'"{}" XML is not parsable. Message: {}'.format(
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root_name, error.message
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)
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)
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def findall(self, name):
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"""Similar to ElementTree.Element.findall()
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"""
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return [
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STSElement(self.root_name, elem)
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for elem in self.element.findall('sts:{}'.format(name), _STS_NS)
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]
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def find(self, name):
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"""Similar to ElementTree.Element.find()
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"""
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elt = self.element.find('sts:{}'.format(name), _STS_NS)
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return STSElement(self.root_name, elt) if elt is not None else None
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def get_child_text(self, name, strict=True):
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"""Extract text of a child element. If strict, and child element is
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not present, raises InvalidXMLError and otherwise returns
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None.
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"""
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if strict:
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try:
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return self.element.find('sts:{}'.format(name), _STS_NS).text
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except _ETREE_EXCEPTIONS as error:
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raise InvalidXMLError(
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('Invalid XML provided for "{}" - erroring tag <{}>. '
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'Message: {}').format(self.root_name, name, error.message)
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)
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else:
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return self.element.findtext('sts:{}'.format(name), None, _STS_NS)
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def text(self):
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"""Fetch the current node's text
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"""
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return self.element.text
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