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_builders.py
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#
# Copyright (c), 2016-2020, SISSA (International School for Advanced Studies).
# All rights reserved.
# This file is distributed under the terms of the MIT License.
# See the file 'LICENSE' in the root directory of the present
# distribution, or http://opensource.org/licenses/MIT.
#
# @author Davide Brunato <brunato@sissa.it>
#
# mypy: ignore-errors
import pdb
import os
import ast
import pickle
import re
import time
import logging
import importlib
import tempfile
import warnings
from xml.etree import ElementTree
try:
import lxml.etree as lxml_etree
except ImportError:
lxml_etree = None
lxml_etree_element = None
else:
lxml_etree_element = lxml_etree.Element
from elementpath.etree import PyElementTree, etree_tostring
import xmlschema
from xmlschema import XMLSchemaBase, XMLSchema11, XMLSchemaValidationError, \
XMLSchemaParseError, UnorderedConverter, ParkerConverter, BadgerFishConverter, \
AbderaConverter, JsonMLConverter, ColumnarConverter
from xmlschema.names import XSD_IMPORT
from xmlschema.helpers import local_name
from xmlschema.resources import fetch_namespaces
from xmlschema.validators import XsdType, Xsd11ComplexType
from xmlschema.dataobjects import DataElementConverter, DataBindingConverter, DataElement
try:
from xmlschema.extras.codegen import PythonGenerator
except ImportError:
PythonGenerator = None
from ._helpers import iter_nested_items, etree_elements_assert_equal
from ._case_class import XsdValidatorTestCase
from ._observers import SchemaObserver
OBJ_ID_PATTERN = re.compile(r" at 0x[0-9a-fA-F]+")
def make_schema_test_class(test_file, test_args, test_num, schema_class, check_with_lxml):
"""
Creates a schema test class.
:param test_file: the schema test file path.
:param test_args: line arguments for test case.
:param test_num: a positive integer number associated with the test case.
:param schema_class: the schema class to use.
:param check_with_lxml: if `True` compare with lxml XMLSchema class, reporting anomalies. \
Works only for XSD 1.0 tests.
"""
xsd_file = os.path.relpath(test_file)
# Extract schema test arguments
expected_errors = test_args.errors
expected_warnings = test_args.warnings
inspect = test_args.inspect
locations = test_args.locations
defuse = test_args.defuse
no_pickle = test_args.no_pickle
debug_mode = test_args.debug
codegen = test_args.codegen
loglevel = logging.DEBUG if debug_mode else None
class TestSchema(XsdValidatorTestCase):
@classmethod
def setUpClass(cls):
cls.schema_class = schema_class
cls.errors = []
cls.longMessage = True
if debug_mode:
print("\n##\n## Testing %r schema in debug mode.\n##" % xsd_file)
pdb.set_trace()
def check_xsd_file(self):
if expected_errors > 0:
schema = schema_class(xsd_file, validation='lax', locations=locations,
defuse=defuse, loglevel=loglevel)
else:
schema = schema_class(xsd_file, locations=locations,
defuse=defuse, loglevel=loglevel)
self.errors.extend(schema.maps.all_errors)
if inspect:
components_ids = set([id(c) for c in schema.maps.iter_components()])
components_ids.update(id(c) for c in schema.meta_schema.iter_components())
missing = [
c for c in SchemaObserver.components if id(c) not in components_ids
]
if missing:
raise ValueError("schema missing %d components: %r" % (len(missing), missing))
# Pickling test (skip inspected schema classes test)
if not inspect and not no_pickle:
try:
obj = pickle.dumps(schema)
deserialized_schema = pickle.loads(obj)
except pickle.PicklingError:
# Don't raise if some schema parts (eg. a schema loaded from remote)
# are built with the SafeXMLParser that uses pure Python elements.
for e in schema.maps.iter_components():
elem = getattr(e, 'elem', getattr(e, 'root', None))
if isinstance(elem, PyElementTree.Element):
break
else:
raise
else:
self.assertTrue(isinstance(deserialized_schema, XMLSchemaBase), msg=xsd_file)
self.assertEqual(schema.built, deserialized_schema.built, msg=xsd_file)
# XPath node tree tests
if not inspect and not self.errors:
xpath_root = schema.xpath_node
element_nodes = [x for x in xpath_root.iter() if hasattr(x, 'elem')]
descendants = [x for x in xpath_root.iter_descendants('descendant-or-self')]
self.assertTrue(x in descendants for x in element_nodes)
context_xsd_elements = [e.value for e in element_nodes]
for xsd_element in schema.iter():
# Context elements can include elements of other schemas (by element ref)
self.assertIn(xsd_element, context_xsd_elements, msg=xsd_file)
# Checks on XSD types
for xsd_type in schema.maps.iter_components(xsd_classes=XsdType):
self.assertIn(
xsd_type.content_type_label, {'empty', 'simple', 'element-only', 'mixed'},
msg=xsd_file
)
# Check that the schema is valid also with XSD 1.1 validator
if not expected_errors and schema_class.XSD_VERSION == '1.0':
try:
XMLSchema11(xsd_file, locations=locations, defuse=defuse, loglevel=loglevel)
except XMLSchemaParseError as err:
if not isinstance(err.validator, Xsd11ComplexType) or \
"is simple or has a simple content" not in str(err):
raise # Not a case of forbidden complex content extension
schema = schema_class(xsd_file, validation='lax', locations=locations,
defuse=defuse, loglevel=loglevel)
for error in schema.all_errors:
if not isinstance(err.validator, Xsd11ComplexType) or \
"is simple or has a simple content" not in str(err):
raise error
# Check XML bindings module only for schemas that do not have errors
if codegen and PythonGenerator is not None and not self.errors and \
all('schemaLocation' in e.attrib for e in schema.root if e.tag == XSD_IMPORT):
generator = PythonGenerator(schema)
with tempfile.TemporaryDirectory() as tempdir:
cwd = os.getcwd()
try:
schema.export(tempdir, save_remote=True)
os.chdir(tempdir)
generator.render_to_files('bindings.py.jinja')
spec = importlib.util.spec_from_file_location(tempdir, 'bindings.py')
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
finally:
os.chdir(cwd)
def check_xsd_file_with_lxml(self, xmlschema_time):
start_time = time.time()
lxs = lxml_etree.parse(xsd_file)
try:
lxml_etree.XMLSchema(lxs.getroot())
except lxml_etree.XMLSchemaParseError as err:
if not self.errors:
print("\nSchema error with lxml.etree.XMLSchema for file {!r} ({}): {}".format(
xsd_file, self.__class__.__name__, str(err)
))
else:
if self.errors:
msg = "\nUnrecognized errors with lxml.etree.XMLSchema for file {!r} ({}): {}"
print(msg.format(
xsd_file, self.__class__.__name__,
'\n++++++\n'.join([str(e) for e in self.errors])
))
lxml_schema_time = time.time() - start_time
if lxml_schema_time >= xmlschema_time:
msg = "\nSlower lxml.etree.XMLSchema ({:.3f}s VS {:.3f}s) with file {!r} ({})"
print(msg.format(
lxml_schema_time, xmlschema_time, xsd_file, self.__class__.__name__
))
def test_xsd_file(self):
if inspect:
SchemaObserver.clear()
del self.errors[:]
start_time = time.time()
if expected_warnings > 0:
with warnings.catch_warnings(record=True) as include_import_warnings:
warnings.simplefilter("always")
self.check_xsd_file()
self.assertEqual(len(include_import_warnings), expected_warnings, msg=xsd_file)
else:
self.check_xsd_file()
# Check with lxml.etree.XMLSchema class
if check_with_lxml and lxml_etree is not None:
self.check_xsd_file_with_lxml(xmlschema_time=time.time() - start_time)
self.check_errors(xsd_file, expected_errors)
TestSchema.__name__ = TestSchema.__qualname__ = str('TestSchema{0:03}'.format(test_num))
return TestSchema
def make_validation_test_class(test_file, test_args, test_num, schema_class, check_with_lxml):
"""
Creates a test class for checking xml instance validation.
:param test_file: the XML test file path.
:param test_args: line arguments for test case.
:param test_num: a positive integer number associated with the test case.
:param schema_class: the schema class to use.
:param check_with_lxml: if `True` compare with lxml XMLSchema class, reporting anomalies. \
Works only for XSD 1.0 tests.
"""
xml_file = os.path.relpath(test_file)
msg_tmpl = '%s: {0}:\n\n{1}' % xml_file
# Extract schema test arguments
expected_errors = test_args.errors
expected_warnings = test_args.warnings
inspect = test_args.inspect
locations = test_args.locations
defuse = test_args.defuse
validation_only = test_args.validation_only
no_pickle = test_args.no_pickle
lax_encode = test_args.lax_encode
debug_mode = test_args.debug
codegen = test_args.codegen
class TestValidator(XsdValidatorTestCase):
@classmethod
def setUpClass(cls):
# Builds schema instance using 'lax' validation mode
# to accepts also schemas with not crashing errors.
cls.schema_class = schema_class
source, _locations = xmlschema.fetch_schema_locations(xml_file, locations)
cls.schema = schema_class(source, validation='lax', locations=_locations, defuse=defuse)
if check_with_lxml and lxml_etree is not None:
cls.lxml_schema = lxml_etree.parse(source)
cls.errors = []
cls.chunks = []
cls.longMessage = True
if debug_mode:
print("\n##\n## Testing %r validation in debug mode.\n##" % xml_file)
pdb.set_trace()
def check_decode_encode(self, root, converter=None, **kwargs):
namespaces = kwargs.get('namespaces', {})
lossy = converter in (ParkerConverter, AbderaConverter, ColumnarConverter)
losslessly = converter is JsonMLConverter
unordered = converter not in (AbderaConverter, JsonMLConverter) or \
kwargs.get('unordered', False)
decoded_data1 = self.schema.decode(root, converter=converter, **kwargs)
if isinstance(decoded_data1, tuple):
decoded_data1 = decoded_data1[0] # When validation='lax'
for _ in iter_nested_items(decoded_data1):
pass
try:
elem1 = self.schema.encode(
decoded_data1, path=root.tag, converter=converter, **kwargs
)
except XMLSchemaValidationError as err:
raise AssertionError(msg_tmpl.format("error during re-encoding", str(err)))
if isinstance(elem1, tuple):
# When validation='lax'
if converter is not ParkerConverter and converter is not ColumnarConverter:
for e in elem1[1]:
self.check_namespace_prefixes(str(e))
elem1 = elem1[0]
# Checks the encoded element to not contains reserved namespace prefixes
if namespaces and all('ns%d' % k not in namespaces for k in range(10)):
self.check_namespace_prefixes(etree_tostring(elem1, namespaces=namespaces))
# Main check: compare original a re-encoded tree
try:
etree_elements_assert_equal(root, elem1, strict=False, unordered=unordered)
except AssertionError as err:
# If the check fails retry only if the converter is lossy (eg. ParkerConverter)
# or if the XML case has defaults taken from the schema or some part of data
# decoding is skipped by schema wildcards (set the specific argument in testfiles).
if lax_encode:
# can't ensure encode equivalence on this case,
# for example if the test case use defaults.
pass
elif lossy or unordered:
# can't check encode equivalence if the converter
# is lossy or if it is not fully ordered.
pass
elif losslessly:
if debug_mode:
pdb.set_trace()
raise AssertionError(
msg_tmpl.format("encoded tree differs from original", str(err))
)
else:
# Lossy or augmenting cases are checked with another decoding/encoding pass
decoded_data2 = self.schema.decode(elem1, converter=converter, **kwargs)
if isinstance(decoded_data2, tuple):
decoded_data2 = decoded_data2[0]
try:
self.assertEqual(decoded_data1, decoded_data2, msg=xml_file)
except AssertionError:
if debug_mode:
pdb.set_trace()
raise
elem2 = self.schema.encode(
decoded_data2, path=root.tag, converter=converter, **kwargs
)
if isinstance(elem2, tuple):
elem2 = elem2[0]
try:
etree_elements_assert_equal(
elem1, elem2, strict=False, unordered=unordered
)
except AssertionError as err:
if debug_mode:
pdb.set_trace()
raise AssertionError(
msg_tmpl.format("encoded tree differs after second pass", str(err))
)
def check_json_serialization(self, root, converter=None, **kwargs):
lossy = converter in (ParkerConverter, AbderaConverter, ColumnarConverter)
unordered = converter not in (AbderaConverter, JsonMLConverter) or \
kwargs.get('unordered', False)
# Use str instead of float in order to preserve original data
kwargs['decimal_type'] = str
json_data1 = xmlschema.to_json(root, schema=self.schema, converter=converter, **kwargs)
if isinstance(json_data1, tuple):
json_data1 = json_data1[0]
elem1 = xmlschema.from_json(
json_data1, schema=self.schema, path=root.tag, converter=converter, **kwargs
)
if isinstance(elem1, tuple):
elem1 = elem1[0]
if lax_encode:
kwargs['validation'] = kwargs.get('validation', 'lax')
json_data2 = xmlschema.to_json(
elem1, schema=self.schema, converter=converter, **kwargs
)
if isinstance(json_data2, tuple):
json_data2 = json_data2[0]
if json_data2 != json_data1 and (lax_encode or lossy or unordered):
# Can't ensure decode equivalence if the test case use defaults,
# white spaces are replaced/collapsed or the converter is lossy
# or the decoding is unordered.
return
self.assertEqual(json_data2, json_data1, msg=xml_file)
def check_decoding_with_element_tree(self):
del self.errors[:]
del self.chunks[:]
def do_decoding():
for obj in self.schema.iter_decode(xml_file):
if isinstance(obj, (xmlschema.XMLSchemaDecodeError,
xmlschema.XMLSchemaValidationError)):
self.errors.append(obj)
else:
self.chunks.append(obj)
if expected_warnings == 0:
do_decoding()
else:
with warnings.catch_warnings(record=True) as include_import_warnings:
warnings.simplefilter("always")
do_decoding()
self.assertEqual(len(include_import_warnings), expected_warnings, msg=xml_file)
self.check_errors(xml_file, expected_errors)
if not self.chunks:
raise ValueError("No decoded object returned!!")
elif len(self.chunks) > 1:
raise ValueError("Too many ({}) decoded objects returned: {}".format(
len(self.chunks), self.chunks)
)
elif not self.errors:
try:
skip_decoded_data = self.schema.decode(xml_file, validation='skip')
self.assertEqual(skip_decoded_data, self.chunks[0], msg=xml_file)
except AssertionError:
if not lax_encode:
raise
def check_schema_serialization(self):
# Repeat with serialized-deserialized schema (only for Python 3)
serialized_schema = pickle.dumps(self.schema)
deserialized_schema = pickle.loads(serialized_schema)
deserialized_errors = []
deserialized_chunks = []
for obj in deserialized_schema.iter_decode(xml_file):
if isinstance(obj, xmlschema.XMLSchemaValidationError):
deserialized_errors.append(obj)
else:
deserialized_chunks.append(obj)
self.assertEqual(len(deserialized_errors), len(self.errors), msg=xml_file)
self.assertEqual(deserialized_chunks, self.chunks, msg=xml_file)
def check_decode_api(self):
# Compare with the decode API and other validation modes
strict_decoded_data = self.schema.decode(xml_file)
lax_decoded_data = self.schema.decode(xml_file, validation='lax')
skip_decoded_data = self.schema.decode(xml_file, validation='skip')
self.assertEqual(strict_decoded_data, self.chunks[0], msg=xml_file)
self.assertEqual(lax_decoded_data[0], self.chunks[0], msg=xml_file)
self.assertEqual(skip_decoded_data, self.chunks[0], msg=xml_file)
def check_data_conversion_with_element_tree(self):
root = ElementTree.parse(xml_file).getroot()
namespaces = fetch_namespaces(xml_file)
options = {'namespaces': namespaces}
self.check_decode_encode(root, cdata_prefix='#', **options) # Default converter
self.check_decode_encode(root, UnorderedConverter, cdata_prefix='#', **options)
self.check_decode_encode(root, ParkerConverter, validation='lax', **options)
self.check_decode_encode(root, ParkerConverter, validation='skip', **options)
self.check_decode_encode(root, BadgerFishConverter, **options)
self.check_decode_encode(root, AbderaConverter, **options)
self.check_decode_encode(root, JsonMLConverter, **options)
self.check_decode_encode(root, ColumnarConverter, validation='lax', **options)
self.check_decode_encode(root, DataElementConverter, **options)
self.check_decode_encode(root, DataBindingConverter, **options)
self.schema.maps.clear_bindings()
self.check_json_serialization(root, cdata_prefix='#', **options)
self.check_json_serialization(root, UnorderedConverter, **options)
self.check_json_serialization(root, ParkerConverter, validation='lax', **options)
self.check_json_serialization(root, ParkerConverter, validation='skip', **options)
self.check_json_serialization(root, BadgerFishConverter, **options)
self.check_json_serialization(root, AbderaConverter, **options)
self.check_json_serialization(root, JsonMLConverter, **options)
self.check_json_serialization(root, ColumnarConverter, validation='lax', **options)
self.check_decode_to_objects(root)
self.check_decode_to_objects(root, with_bindings=True)
self.schema.maps.clear_bindings()
def check_decode_to_objects(self, root, with_bindings=False):
data_element = self.schema.to_objects(xml_file, with_bindings)
self.assertIsInstance(data_element, DataElement)
self.assertEqual(data_element.tag, root.tag)
if not with_bindings:
self.assertIs(data_element.__class__, DataElement)
else:
self.assertEqual(data_element.tag, root.tag)
self.assertTrue(data_element.__class__.__name__.endswith('Binding'))
def check_data_conversion_with_lxml(self):
xml_tree = lxml_etree.parse(xml_file)
namespaces = fetch_namespaces(xml_file)
lxml_errors = []
lxml_decoded_chunks = []
for obj in self.schema.iter_decode(xml_tree, namespaces=namespaces):
if isinstance(obj, xmlschema.XMLSchemaValidationError):
lxml_errors.append(obj)
else:
lxml_decoded_chunks.append(obj)
self.assertEqual(lxml_decoded_chunks, self.chunks, msg=xml_file)
self.assertEqual(len(lxml_errors), len(self.errors), msg=xml_file)
if not lxml_errors:
root = xml_tree.getroot()
if namespaces.get(''):
# Add a not empty prefix for encoding to avoid the use of reserved prefix ns0
namespaces['tns0'] = namespaces['']
options = {
'etree_element_class': lxml_etree_element,
'namespaces': namespaces,
}
self.check_decode_encode(root, cdata_prefix='#', **options) # Default converter
self.check_decode_encode(root, ParkerConverter, validation='lax', **options)
self.check_decode_encode(root, ParkerConverter, validation='skip', **options)
self.check_decode_encode(root, BadgerFishConverter, **options)
self.check_decode_encode(root, AbderaConverter, **options)
self.check_decode_encode(root, JsonMLConverter, **options)
self.check_decode_encode(root, UnorderedConverter, cdata_prefix='#', **options)
self.check_json_serialization(root, cdata_prefix='#', **options)
self.check_json_serialization(root, ParkerConverter, validation='lax', **options)
self.check_json_serialization(root, ParkerConverter, validation='skip', **options)
self.check_json_serialization(root, BadgerFishConverter, **options)
self.check_json_serialization(root, AbderaConverter, **options)
self.check_json_serialization(root, JsonMLConverter, **options)
self.check_json_serialization(root, UnorderedConverter, **options)
def check_validate_and_is_valid_api(self):
if expected_errors:
self.assertFalse(self.schema.is_valid(xml_file), msg=xml_file)
with self.assertRaises(XMLSchemaValidationError, msg=xml_file):
self.schema.validate(xml_file)
else:
self.assertTrue(self.schema.is_valid(xml_file), msg=xml_file)
self.assertIsNone(self.schema.validate(xml_file), msg=xml_file)
def check_iter_errors(self):
def compare_error_reasons(reason, other_reason):
if ' at 0x' in reason:
self.assertEqual(
OBJ_ID_PATTERN.sub(' at 0xff', reason),
OBJ_ID_PATTERN.sub(' at 0xff', other_reason),
msg=xml_file
)
else:
self.assertEqual(reason, other_reason, msg=xml_file)
errors = list(self.schema.iter_errors(xml_file))
for e in errors:
self.assertIsInstance(e.reason, str, msg=xml_file)
self.assertEqual(len(errors), expected_errors, msg=xml_file)
module_api_errors = list(xmlschema.iter_errors(xml_file, schema=self.schema))
self.assertEqual(len(errors), len(module_api_errors), msg=xml_file)
for e, api_error in zip(errors, module_api_errors):
compare_error_reasons(e.reason, api_error.reason)
lazy_errors = list(xmlschema.iter_errors(xml_file, schema=self.schema, lazy=True))
self.assertEqual(len(errors), len(lazy_errors), msg=xml_file)
for e, lazy_error in zip(errors, lazy_errors):
compare_error_reasons(e.reason, lazy_error.reason)
# TODO: Test also lazy validation with lazy=2.
# This needs two fixes in XPath:
# 1) find has to retrieve also element substitutes
# 2) multiple XSD type match on tokens that have wildcard parent (eg. /root/*/name)
def check_lxml_validation(self):
try:
schema = lxml_etree.XMLSchema(self.lxml_schema.getroot())
except lxml_etree.XMLSchemaParseError:
print("\nSkip lxml.etree.XMLSchema validation test for {!r} ({})".
format(xml_file, TestValidator.__name__, ))
else:
xml_tree = lxml_etree.parse(xml_file)
if self.errors:
self.assertFalse(schema.validate(xml_tree), msg=xml_file)
else:
self.assertTrue(schema.validate(xml_tree), msg=xml_file)
def check_validation_with_generated_code(self):
generator = PythonGenerator(self.schema)
python_module = generator.render('bindings.py.jinja')[0]
ast_module = ast.parse(python_module)
self.assertIsInstance(ast_module, ast.Module)
with tempfile.TemporaryDirectory() as tempdir:
module_name = '{}.py'.format(self.schema.name.rstrip('.xsd'))
cwd = os.getcwd()
try:
self.schema.export(tempdir, save_remote=True)
os.chdir(tempdir)
with open(module_name, 'w') as fp:
fp.write(python_module)
spec = importlib.util.spec_from_file_location(tempdir, module_name)
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
xml_root = ElementTree.parse(os.path.join(cwd, xml_file)).getroot()
bindings = [x for x in filter(lambda x: x.endswith('Binding'), dir(module))]
if len(bindings) == 1:
class_name = bindings[0]
else:
class_name = '{}Binding'.format(
local_name(xml_root.tag).title().replace('_', ''))
binding_class = getattr(module, class_name)
xml_data = binding_class.fromsource(os.path.join(cwd, xml_file))
self.assertEqual(xml_data.tag, xml_root.tag)
finally:
os.chdir(cwd)
def test_xml_document_validation(self):
if not validation_only:
self.check_decoding_with_element_tree()
if not inspect and not no_pickle:
self.check_schema_serialization()
if not self.errors:
self.check_data_conversion_with_element_tree()
if lxml_etree is not None:
self.check_data_conversion_with_lxml()
self.check_iter_errors()
self.check_validate_and_is_valid_api()
if check_with_lxml and lxml_etree is not None:
self.check_lxml_validation()
# Test validation with XML data bindings only for instances and
# schemas that do not have errors and imports without locations
if not validation_only and codegen and PythonGenerator is not None and \
not self.errors and not self.schema.all_errors and \
all('schemaLocation' in e.attrib
for e in self.schema.root
if e.tag == XSD_IMPORT):
self.check_validation_with_generated_code()
TestValidator.__name__ = TestValidator.__qualname__ = 'TestValidator{0:03}'.format(test_num)
return TestValidator