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minio/docs/sts/client_grants/sts_element.py

90 lines
3.0 KiB

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