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# encoding: utf-8
# This file is part of py-serializable
#
# 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.
#
# SPDX-License-Identifier: Apache-2.0
# Copyright (c) Paul Horton. All Rights Reserved.
from copy import copy
from decimal import Decimal
from enum import Enum, EnumMeta, unique
from inspect import getfullargspec, getmembers, isclass
from io import StringIO, TextIOBase
from json import JSONEncoder, dumps as json_dumps
from logging import NullHandler, getLogger
from re import compile as re_compile, search as re_search
from typing import (
Any,
Callable,
Dict,
Iterable,
List,
Literal,
Optional,
Protocol,
Set,
Tuple,
Type,
TypeVar,
Union,
cast,
overload,
)
from xml.etree.ElementTree import Element, SubElement
from defusedxml import ElementTree as SafeElementTree # type:ignore[import-untyped]
from .formatters import BaseNameFormatter, CurrentFormatter
from .helpers import BaseHelper
from .xml import xs_normalizedString, xs_token
# `Intersection` is still not implemented, so it is interim replaced by Union for any support
# see section "Intersection" in https://peps.python.org/pep-0483/
# see https://github.com/python/typing/issues/213
from typing import Union as Intersection # isort: skip
# MUST import the whole thing to get some eval/hacks working for dynamic type detection.
import typing # noqa: F401 # isort: skip
# !! version is managed by semantic_release
# do not use typing here, or else `semantic_release` might have issues finding the variable
__version__ = '2.0.0'
_logger = getLogger(__name__)
_logger.addHandler(NullHandler())
# make `logger` publicly available, as stable API
logger = _logger
"""
The logger. The thing that captures all this package has to say.
Feel free to modify its level and attach handlers to it.
"""
class ViewType:
"""Base of all views."""
pass
_F = TypeVar('_F', bound=Callable[..., Any])
_T = TypeVar('_T')
_E = TypeVar('_E', bound=Enum)
@unique
class SerializationType(str, Enum):
"""
Enum to define the different formats supported for serialization and deserialization.
"""
JSON = 'JSON'
XML = 'XML'
# tuple = immutable collection -> immutable = prevent unexpected modifications
_DEFAULT_SERIALIZATION_TYPES: Iterable[SerializationType] = (
SerializationType.JSON,
SerializationType.XML,
)
@unique
class XmlArraySerializationType(Enum):
"""
Enum to differentiate how array-type properties (think Iterables) are serialized.
Given a ``Warehouse`` has a property ``boxes`` that returns `List[Box]`:
``FLAT`` would allow for XML looking like:
``
<warehouse>
<box>..box 1..</box>
<box>..box 2..</box>
</warehouse>
``
``NESTED`` would allow for XML looking like:
``
<warehouse>
<boxes>
<box>..box 1..</box>
<box>..box 2..</box>
</boxes>
</warehouse>
``
"""
FLAT = 1
NESTED = 2
@unique
class XmlStringSerializationType(Enum):
"""
Enum to differentiate how string-type properties are serialized.
"""
STRING = 1
"""
as raw string.
see https://www.w3.org/TR/xmlschema-2/#string
"""
NORMALIZED_STRING = 2
"""
as `normalizedString`.
see http://www.w3.org/TR/xmlschema-2/#normalizedString"""
TOKEN = 3
"""
as `token`.
see http://www.w3.org/TR/xmlschema-2/#token"""
# unimplemented cases
# - https://www.w3.org/TR/xmlschema-2/#language
# - https://www.w3.org/TR/xmlschema-2/#NMTOKEN
# - https://www.w3.org/TR/xmlschema-2/#Name
# region _xs_string_mod_apply
__XS_STRING_MODS: Dict[XmlStringSerializationType, Callable[[str], str]] = {
XmlStringSerializationType.NORMALIZED_STRING: xs_normalizedString,
XmlStringSerializationType.TOKEN: xs_token,
}
def _xs_string_mod_apply(v: str, t: Optional[XmlStringSerializationType]) -> str:
mod = __XS_STRING_MODS.get(t) # type: ignore[arg-type]
return mod(v) if mod else v
# endregion _xs_string_mod_apply
def _allow_property_for_view(prop_info: 'ObjectMetadataLibrary.SerializableProperty', value_: Any,
view_: Optional[Type[ViewType]]) -> bool:
# First check Property is part of the View is given
allow_for_view = False
if view_:
if prop_info.views and view_ in prop_info.views:
allow_for_view = True
elif not prop_info.views:
allow_for_view = True
else:
if not prop_info.views:
allow_for_view = True
# Second check for inclusion of None values
if value_ is None or (prop_info.is_array and len(value_) < 1):
if not prop_info.include_none:
allow_for_view = False
elif prop_info.include_none and prop_info.include_none_views:
allow_for_view = False
for _v, _a in prop_info.include_none_views:
if _v == view_:
allow_for_view = True
return allow_for_view
class _SerializableJsonEncoder(JSONEncoder):
"""
``py_serializable``'s custom implementation of ``JSONEncode``.
You don't need to call this directly - it is all handled for you by ``py_serializable``.
"""
def __init__(self, *, skipkeys: bool = False, ensure_ascii: bool = True, check_circular: bool = True,
allow_nan: bool = True, sort_keys: bool = False, indent: Optional[int] = None,
separators: Optional[Tuple[str, str]] = None, default: Optional[Callable[[Any], Any]] = None,
view_: Optional[Type[ViewType]] = None) -> None:
super().__init__(
skipkeys=skipkeys, ensure_ascii=ensure_ascii, check_circular=check_circular, allow_nan=allow_nan,
sort_keys=sort_keys, indent=indent, separators=separators, default=default
)
self._view: Optional[Type[ViewType]] = view_
@property
def view(self) -> Optional[Type[ViewType]]:
return self._view
def default(self, o: Any) -> Any:
# Enum
if isinstance(o, Enum):
return o.value
# Iterables
if isinstance(o, (list, set)):
return list(o)
# Classes
if isinstance(o, object):
d: Dict[Any, Any] = {}
klass_qualified_name = f'{o.__module__}.{o.__class__.__qualname__}'
serializable_property_info = ObjectMetadataLibrary.klass_property_mappings.get(klass_qualified_name, {})
# Handle remaining Properties that will be sub elements
for k, prop_info in serializable_property_info.items():
v = getattr(o, k)
if not _allow_property_for_view(prop_info=prop_info, view_=self._view, value_=v):
# Skip as rendering for a view and this Property is not registered form this View
continue
new_key = BaseNameFormatter.decode_handle_python_builtins_and_keywords(name=k)
if custom_name := prop_info.custom_names.get(SerializationType.JSON):
new_key = str(custom_name)
if CurrentFormatter.formatter:
new_key = CurrentFormatter.formatter.encode(property_name=new_key)
if prop_info.custom_type:
if prop_info.is_helper_type():
v = prop_info.custom_type.json_normalize(
v, view=self._view, prop_info=prop_info, ctx=o.__class__)
else:
v = prop_info.custom_type(v)
elif prop_info.is_array:
if len(v) > 0:
v = list(v)
else:
v = None
elif prop_info.is_enum:
v = str(v.value)
elif not prop_info.is_primitive_type():
if isinstance(v, Decimal):
if prop_info.string_format:
v = float(f'{v:{prop_info.string_format}}')
else:
v = float(v)
else:
global_klass_name = f'{prop_info.concrete_type.__module__}.{prop_info.concrete_type.__name__}'
if global_klass_name not in ObjectMetadataLibrary.klass_mappings:
if prop_info.string_format:
v = f'{v:{prop_info.string_format}}'
else:
v = str(v)
if new_key == '.':
return v
if _allow_property_for_view(prop_info=prop_info, view_=self._view, value_=v):
# We need to recheck as values may have been modified above
d.update({new_key: v if v is not None else prop_info.get_none_value_for_view(view_=self._view)})
return d
# Fallback to default
super().default(o=o)
class _JsonSerializable(Protocol):
def as_json(self: Any, view_: Optional[Type[ViewType]] = None) -> str:
"""
Internal method that is injected into Classes that are annotated for serialization and deserialization by
``py_serializable``.
"""
_logger.debug('Dumping %s to JSON with view: %s...', self, view_)
return json_dumps(self, cls=_SerializableJsonEncoder, view_=view_)
@classmethod
def from_json(cls: Type[_T], data: Dict[str, Any]) -> Optional[_T]:
"""
Internal method that is injected into Classes that are annotated for serialization and deserialization by
``py_serializable``.
"""
_logger.debug('Rendering JSON to %s...', cls)
klass_qualified_name = f'{cls.__module__}.{cls.__qualname__}'
klass = ObjectMetadataLibrary.klass_mappings.get(klass_qualified_name)
klass_properties = ObjectMetadataLibrary.klass_property_mappings.get(klass_qualified_name, {})
if klass is None:
_logger.warning(
'%s is not a known py_serializable class', klass_qualified_name,
stacklevel=2)
return None
if len(klass_properties) == 1:
k, only_prop = next(iter(klass_properties.items()))
if only_prop.custom_names.get(SerializationType.JSON) == '.':
return cls(**{only_prop.name: data})
_data = copy(data)
for k, v in data.items():
decoded_k = CurrentFormatter.formatter.decode(property_name=k)
if decoded_k in klass.ignore_during_deserialization:
_logger.debug('Ignoring %s when deserializing %s.%s', k, cls.__module__, cls.__qualname__)
del _data[k]
continue
new_key = None
if decoded_k not in klass_properties:
_allowed_custom_names = {decoded_k, k}
for p, pi in klass_properties.items():
if pi.custom_names.get(SerializationType.JSON) in _allowed_custom_names:
new_key = p
else:
new_key = decoded_k
if new_key is None:
_logger.error('Unexpected key %s/%s in data being serialized to %s.%s',
k, decoded_k, cls.__module__, cls.__qualname__)
raise ValueError(
f'Unexpected key {k}/{decoded_k} in data being serialized to {cls.__module__}.{cls.__qualname__}'
)
del (_data[k])
_data[new_key] = v
for k, v in _data.items():
prop_info = klass_properties.get(k)
if not prop_info:
raise ValueError(f'No Prop Info for {k} in {cls}')
try:
if prop_info.custom_type:
if prop_info.is_helper_type():
_data[k] = prop_info.custom_type.json_denormalize(
v, prop_info=prop_info, ctx=klass)
else:
_data[k] = prop_info.custom_type(v)
elif prop_info.is_array:
items = []
for j in v:
if not prop_info.is_primitive_type() and not prop_info.is_enum:
items.append(prop_info.concrete_type.from_json(data=j))
else:
items.append(prop_info.concrete_type(j))
_data[k] = items # type: ignore
elif prop_info.is_enum:
_data[k] = prop_info.concrete_type(v)
elif not prop_info.is_primitive_type():
global_klass_name = f'{prop_info.concrete_type.__module__}.{prop_info.concrete_type.__name__}'
if global_klass_name in ObjectMetadataLibrary.klass_mappings:
_data[k] = prop_info.concrete_type.from_json(data=v)
else:
if prop_info.concrete_type is Decimal:
v = str(v)
_data[k] = prop_info.concrete_type(v)
except AttributeError as e:
_logger.exception('There was an AttributeError deserializing JSON to %s.\n'
'The Property is: %s\n'
'The Value was: %s\n',
cls, prop_info, v)
raise AttributeError(
f'There was an AttributeError deserializing JSON to {cls} the Property {prop_info}: {e}'
) from e
_logger.debug('Creating %s from %s', cls, _data)
return cls(**_data)
_XML_BOOL_REPRESENTATIONS_TRUE = ('1', 'true')
class _XmlSerializable(Protocol):
def as_xml(self: Any, view_: Optional[Type[ViewType]] = None,
as_string: bool = True, element_name: Optional[str] = None,
xmlns: Optional[str] = None) -> Union[Element, str]:
"""
Internal method that is injected into Classes that are annotated for serialization and deserialization by
``py_serializable``.
"""
_logger.debug('Dumping %s to XML with view %s...', self, view_)
this_e_attributes = {}
klass_qualified_name = f'{self.__class__.__module__}.{self.__class__.__qualname__}'
serializable_property_info = {k: v for k, v in sorted(
ObjectMetadataLibrary.klass_property_mappings.get(klass_qualified_name, {}).items(),
key=lambda i: i[1].xml_sequence)}
for k, v in self.__dict__.items():
# Remove leading _ in key names
new_key = k[1:]
if new_key.startswith('_') or '__' in new_key:
continue
new_key = BaseNameFormatter.decode_handle_python_builtins_and_keywords(name=new_key)
if new_key in serializable_property_info:
prop_info = cast('ObjectMetadataLibrary.SerializableProperty', serializable_property_info.get(new_key))
if not _allow_property_for_view(prop_info=prop_info, view_=view_, value_=v):
# Skip as rendering for a view and this Property is not registered form this View
continue
if prop_info and prop_info.is_xml_attribute:
new_key = prop_info.custom_names.get(SerializationType.XML, new_key)
if CurrentFormatter.formatter:
new_key = CurrentFormatter.formatter.encode(property_name=new_key)
if prop_info.custom_type and prop_info.is_helper_type():
v = prop_info.custom_type.xml_normalize(
v, view=view_, element_name=new_key, xmlns=xmlns, prop_info=prop_info, ctx=self.__class__)
elif prop_info.is_enum:
v = v.value
if v is None:
v = prop_info.get_none_value_for_view(view_=view_)
if v is None:
continue
this_e_attributes[_namespace_element_name(new_key, xmlns)] = \
_xs_string_mod_apply(str(v), prop_info.xml_string_config)
element_name = _namespace_element_name(
element_name if element_name else CurrentFormatter.formatter.encode(self.__class__.__name__),
xmlns)
this_e = Element(element_name, this_e_attributes)
# Handle remaining Properties that will be sub elements
for k, prop_info in serializable_property_info.items():
# Skip if rendering for a View and this Property is not designated for this View
v = getattr(self, k)
if not _allow_property_for_view(prop_info=prop_info, view_=view_, value_=v):
# Skip as rendering for a view and this Property is not registered form this View
continue
new_key = BaseNameFormatter.decode_handle_python_builtins_and_keywords(name=k)
if not prop_info:
raise ValueError(f'{new_key} is not a known Property for {klass_qualified_name}')
if not prop_info.is_xml_attribute:
new_key = prop_info.custom_names.get(SerializationType.XML, new_key)
if v is None:
v = prop_info.get_none_value_for_view(view_=view_)
if v is None:
SubElement(this_e, _namespace_element_name(tag_name=new_key, xmlns=xmlns))
continue
if new_key == '.':
this_e.text = _xs_string_mod_apply(str(v),
prop_info.xml_string_config)
continue
if CurrentFormatter.formatter:
new_key = CurrentFormatter.formatter.encode(property_name=new_key)
new_key = _namespace_element_name(new_key, xmlns)
if prop_info.is_array and prop_info.xml_array_config:
_array_type, nested_key = prop_info.xml_array_config
nested_key = _namespace_element_name(nested_key, xmlns)
if _array_type and _array_type == XmlArraySerializationType.NESTED:
nested_e = SubElement(this_e, new_key)
else:
nested_e = this_e
for j in v:
if not prop_info.is_primitive_type() and not prop_info.is_enum:
nested_e.append(
j.as_xml(view_=view_, as_string=False, element_name=nested_key, xmlns=xmlns))
elif prop_info.is_enum:
SubElement(nested_e, nested_key).text = _xs_string_mod_apply(str(j.value),
prop_info.xml_string_config)
elif prop_info.concrete_type in (float, int):
SubElement(nested_e, nested_key).text = str(j)
elif prop_info.concrete_type is bool:
SubElement(nested_e, nested_key).text = str(j).lower()
else:
# Assume type is str
SubElement(nested_e, nested_key).text = _xs_string_mod_apply(str(j),
prop_info.xml_string_config)
elif prop_info.custom_type:
if prop_info.is_helper_type():
v_ser = prop_info.custom_type.xml_normalize(
v, view=view_, element_name=new_key, xmlns=xmlns, prop_info=prop_info, ctx=self.__class__)
if v_ser is None:
pass # skip the element
elif isinstance(v_ser, Element):
this_e.append(v_ser)
else:
SubElement(this_e, new_key).text = _xs_string_mod_apply(str(v_ser),
prop_info.xml_string_config)
else:
SubElement(this_e, new_key).text = _xs_string_mod_apply(str(prop_info.custom_type(v)),
prop_info.xml_string_config)
elif prop_info.is_enum:
SubElement(this_e, new_key).text = _xs_string_mod_apply(str(v.value),
prop_info.xml_string_config)
elif not prop_info.is_primitive_type():
global_klass_name = f'{prop_info.concrete_type.__module__}.{prop_info.concrete_type.__name__}'
if global_klass_name in ObjectMetadataLibrary.klass_mappings:
# Handle other Serializable Classes
this_e.append(v.as_xml(view_=view_, as_string=False, element_name=new_key, xmlns=xmlns))
else:
# Handle properties that have a type that is not a Python Primitive (e.g. int, float, str)
if prop_info.string_format:
SubElement(this_e, new_key).text = _xs_string_mod_apply(f'{v:{prop_info.string_format}}',
prop_info.xml_string_config)
else:
SubElement(this_e, new_key).text = _xs_string_mod_apply(str(v),
prop_info.xml_string_config)
elif prop_info.concrete_type in (float, int):
SubElement(this_e, new_key).text = str(v)
elif prop_info.concrete_type is bool:
SubElement(this_e, new_key).text = str(v).lower()
else:
# Assume type is str
SubElement(this_e, new_key).text = _xs_string_mod_apply(str(v),
prop_info.xml_string_config)
if as_string:
return cast(Element, SafeElementTree.tostring(this_e, 'unicode'))
else:
return this_e
@classmethod
def from_xml(cls: Type[_T], data: Union[TextIOBase, Element],
default_namespace: Optional[str] = None) -> Optional[_T]:
"""
Internal method that is injected into Classes that are annotated for serialization and deserialization by
``py_serializable``.
"""
_logger.debug('Rendering XML from %s to %s...', type(data), cls)
klass = ObjectMetadataLibrary.klass_mappings.get(f'{cls.__module__}.{cls.__qualname__}')
if klass is None:
_logger.warning('%s.%s is not a known py_serializable class', cls.__module__, cls.__qualname__,
stacklevel=2)
return None
klass_properties = ObjectMetadataLibrary.klass_property_mappings.get(f'{cls.__module__}.{cls.__qualname__}', {})
if isinstance(data, TextIOBase):
data = cast(Element, SafeElementTree.fromstring(data.read()))
if default_namespace is None:
_namespaces = dict(node for _, node in
SafeElementTree.iterparse(StringIO(SafeElementTree.tostring(data, 'unicode')),
events=['start-ns']))
default_namespace = (re_compile(r'^\{(.*?)\}.').search(data.tag) or (None, _namespaces.get('')))[1]
if default_namespace is None:
def strip_default_namespace(s: str) -> str:
return s
else:
def strip_default_namespace(s: str) -> str:
return s.replace(f'{{{default_namespace}}}', '')
_data: Dict[str, Any] = {}
# Handle attributes on the root element if there are any
for k, v in data.attrib.items():
decoded_k = CurrentFormatter.formatter.decode(strip_default_namespace(k))
if decoded_k in klass.ignore_during_deserialization:
_logger.debug('Ignoring %s when deserializing %s.%s', decoded_k, cls.__module__, cls.__qualname__)
continue
if decoded_k not in klass_properties:
for p, pi in klass_properties.items():
if pi.custom_names.get(SerializationType.XML) == decoded_k:
decoded_k = p
prop_info = klass_properties.get(decoded_k)
if not prop_info:
raise ValueError(f'Non-primitive types not supported from XML Attributes - see {decoded_k} for '
f'{cls.__module__}.{cls.__qualname__} which has Prop Metadata: {prop_info}')
if prop_info.xml_string_config:
v = _xs_string_mod_apply(v, prop_info.xml_string_config)
if prop_info.custom_type and prop_info.is_helper_type():
_data[decoded_k] = prop_info.custom_type.xml_deserialize(v)
elif prop_info.is_enum:
_data[decoded_k] = prop_info.concrete_type(v)
elif prop_info.is_primitive_type():
_data[decoded_k] = prop_info.concrete_type(v)
else:
raise ValueError(f'Non-primitive types not supported from XML Attributes - see {decoded_k}')
# Handle Node text content
if data.text:
for p, pi in klass_properties.items():
if pi.custom_names.get(SerializationType.XML) == '.':
_data[p] = _xs_string_mod_apply(data.text.strip(), pi.xml_string_config)
# Handle Sub-Elements
for child_e in data:
decoded_k = CurrentFormatter.formatter.decode(strip_default_namespace(child_e.tag))
if decoded_k not in klass_properties:
for p, pi in klass_properties.items():
if pi.xml_array_config:
array_type, nested_name = pi.xml_array_config
if nested_name == strip_default_namespace(child_e.tag):
decoded_k = p
if decoded_k in klass.ignore_during_deserialization:
_logger.debug('Ignoring %s when deserializing %s.%s', decoded_k, cls.__module__, cls.__qualname__)
continue
if decoded_k not in klass_properties:
for p, pi in klass_properties.items():
if pi.xml_array_config:
array_type, nested_name = pi.xml_array_config
if nested_name == decoded_k:
if array_type == XmlArraySerializationType.FLAT:
decoded_k = p
else:
decoded_k = '____SKIP_ME____'
elif pi.custom_names.get(SerializationType.XML) == decoded_k:
decoded_k = p
if decoded_k == '____SKIP_ME____':
continue
prop_info = klass_properties.get(decoded_k)
if not prop_info:
raise ValueError(f'{decoded_k} is not a known Property for {cls.__module__}.{cls.__qualname__}')
try:
_logger.debug('Handling %s', prop_info)
if child_e.text:
child_e.text = _xs_string_mod_apply(child_e.text, prop_info.xml_string_config)
if prop_info.is_array and prop_info.xml_array_config:
array_type, nested_name = prop_info.xml_array_config
if decoded_k not in _data:
_data[decoded_k] = []
if array_type == XmlArraySerializationType.NESTED:
for sub_child_e in child_e:
if sub_child_e.text:
sub_child_e.text = _xs_string_mod_apply(sub_child_e.text,
prop_info.xml_string_config)
if not prop_info.is_primitive_type() and not prop_info.is_enum:
_data[decoded_k].append(prop_info.concrete_type.from_xml(
data=sub_child_e, default_namespace=default_namespace)
)
else:
_data[decoded_k].append(prop_info.concrete_type(sub_child_e.text))
else:
if not prop_info.is_primitive_type() and not prop_info.is_enum:
_data[decoded_k].append(prop_info.concrete_type.from_xml(
data=child_e, default_namespace=default_namespace)
)
elif prop_info.custom_type:
if prop_info.is_helper_type():
_data[decoded_k] = prop_info.custom_type.xml_denormalize(
child_e, default_ns=default_namespace, prop_info=prop_info, ctx=klass)
else:
_data[decoded_k] = prop_info.custom_type(child_e.text)
else:
_data[decoded_k].append(prop_info.concrete_type(child_e.text))
elif prop_info.custom_type:
if prop_info.is_helper_type():
_data[decoded_k] = prop_info.custom_type.xml_denormalize(
child_e, default_ns=default_namespace, prop_info=prop_info, ctx=klass)
else:
_data[decoded_k] = prop_info.custom_type(child_e.text)
elif prop_info.is_enum:
_data[decoded_k] = prop_info.concrete_type(child_e.text)
elif not prop_info.is_primitive_type():
global_klass_name = f'{prop_info.concrete_type.__module__}.{prop_info.concrete_type.__name__}'
if global_klass_name in ObjectMetadataLibrary.klass_mappings:
_data[decoded_k] = prop_info.concrete_type.from_xml(
data=child_e, default_namespace=default_namespace
)
else:
_data[decoded_k] = prop_info.concrete_type(child_e.text)
else:
if prop_info.concrete_type == bool:
_data[decoded_k] = str(child_e.text) in _XML_BOOL_REPRESENTATIONS_TRUE
else:
_data[decoded_k] = prop_info.concrete_type(child_e.text)
except AttributeError as e:
_logger.exception('There was an AttributeError deserializing JSON to %s.\n'
'The Property is: %s\n'
'The Value was: %s\n',
cls, prop_info, v)
raise AttributeError('There was an AttributeError deserializing XML '
f'to {cls} the Property {prop_info}: {e}') from e
_logger.debug('Creating %s from %s', cls, _data)
if len(_data) == 0:
return None
return cls(**_data)
def _namespace_element_name(tag_name: str, xmlns: Optional[str]) -> str:
if tag_name.startswith('{'):
return tag_name
if xmlns:
return f'{{{xmlns}}}{tag_name}'
return tag_name
class ObjectMetadataLibrary:
"""namespace-like
The core Class in ``py_serializable`` that is used to record all metadata about classes that you annotate for
serialization and deserialization.
"""
_deferred_property_type_parsing: Dict[str, Set['ObjectMetadataLibrary.SerializableProperty']] = {}
_klass_views: Dict[str, Type[ViewType]] = {}
_klass_property_array_config: Dict[str, Tuple[XmlArraySerializationType, str]] = {}
_klass_property_string_config: Dict[str, Optional[XmlStringSerializationType]] = {}
_klass_property_attributes: Set[str] = set()
_klass_property_include_none: Dict[str, Set[Tuple[Type[ViewType], Any]]] = {}
_klass_property_names: Dict[str, Dict[SerializationType, str]] = {}
_klass_property_string_formats: Dict[str, str] = {}
_klass_property_types: Dict[str, type] = {}
_klass_property_views: Dict[str, Set[Type[ViewType]]] = {}
_klass_property_xml_sequence: Dict[str, int] = {}
custom_enum_klasses: Set[Type[Enum]] = set()
klass_mappings: Dict[str, 'ObjectMetadataLibrary.SerializableClass'] = {}
klass_property_mappings: Dict[str, Dict[str, 'ObjectMetadataLibrary.SerializableProperty']] = {}
class SerializableClass:
"""
Internal model class used to represent metadata we hold about Classes that are being included in
(de-)serialization.
"""
def __init__(self, *, klass: type, custom_name: Optional[str] = None,
serialization_types: Optional[Iterable[SerializationType]] = None,
ignore_during_deserialization: Optional[Iterable[str]] = None) -> None:
self._name = str(klass.__name__)
self._klass = klass
self._custom_name = custom_name
if serialization_types is None:
serialization_types = _DEFAULT_SERIALIZATION_TYPES
self._serialization_types = serialization_types
self._ignore_during_deserialization = set(ignore_during_deserialization or ())
@property
def name(self) -> str:
return self._name
@property
def klass(self) -> type:
return self._klass
@property
def custom_name(self) -> Optional[str]:
return self._custom_name
@property
def serialization_types(self) -> Iterable[SerializationType]:
return self._serialization_types
@property
def ignore_during_deserialization(self) -> Set[str]:
return self._ignore_during_deserialization
def __repr__(self) -> str:
return f'<s.oml.SerializableClass name={self.name}>'
class SerializableProperty:
"""
Internal model class used to represent metadata we hold about Properties that are being included in
(de-)serialization.
"""
_ARRAY_TYPES = {'List': List, 'Set': Set, 'SortedSet': Set}
_SORTED_CONTAINERS_TYPES = {'SortedList': List, 'SortedSet': Set}
_PRIMITIVE_TYPES = (bool, int, float, str)
_DEFAULT_XML_SEQUENCE = 100
def __init__(self, *,
prop_name: str, prop_type: Any, custom_names: Dict[SerializationType, str],
custom_type: Optional[Any] = None,
include_none_config: Optional[Set[Tuple[Type[ViewType], Any]]] = None,
is_xml_attribute: bool = False, string_format_: Optional[str] = None,
views: Optional[Iterable[Type[ViewType]]] = None,
xml_array_config: Optional[Tuple[XmlArraySerializationType, str]] = None,
xml_string_config: Optional[XmlStringSerializationType] = None,
xml_sequence_: Optional[int] = None) -> None:
self._name = prop_name
self._custom_names = custom_names
self._type_ = None
self._concrete_type = None
self._is_array = False
self._is_enum = False
self._is_optional = False
self._custom_type = custom_type
if include_none_config is not None:
self._include_none = True
self._include_none_views = include_none_config
else:
self._include_none = False
self._include_none_views = set()
self._is_xml_attribute = is_xml_attribute
self._string_format = string_format_
self._views = set(views or ())
self._xml_array_config = xml_array_config
self._xml_string_config = xml_string_config
self._xml_sequence = xml_sequence_ or self._DEFAULT_XML_SEQUENCE
self._deferred_type_parsing = False
self._parse_type(type_=prop_type)
@property
def name(self) -> str:
return self._name
@property
def custom_names(self) -> Dict[SerializationType, str]:
return self._custom_names
def custom_name(self, serialization_type: SerializationType) -> Optional[str]:
return self.custom_names.get(serialization_type)
@property
def type_(self) -> Any:
return self._type_
@property
def concrete_type(self) -> Any:
return self._concrete_type
@property
def custom_type(self) -> Optional[Any]:
return self._custom_type
@property
def include_none(self) -> bool:
return self._include_none
@property
def include_none_views(self) -> Set[Tuple[Type[ViewType], Any]]:
return self._include_none_views
def include_none_for_view(self, view_: Type[ViewType]) -> bool:
for _v, _a in self._include_none_views:
if _v == view_:
return True
return False
def get_none_value_for_view(self, view_: Optional[Type[ViewType]]) -> Any:
if view_:
for _v, _a in self._include_none_views:
if _v == view_:
return _a
return None
@property
def is_xml_attribute(self) -> bool:
return self._is_xml_attribute
@property
def string_format(self) -> Optional[str]:
return self._string_format
@property
def views(self) -> Set[Type[ViewType]]:
return self._views
@property
def xml_array_config(self) -> Optional[Tuple[XmlArraySerializationType, str]]:
return self._xml_array_config
@property
def is_array(self) -> bool:
return self._is_array
@property
def xml_string_config(self) -> Optional[XmlStringSerializationType]:
return self._xml_string_config
@property
def is_enum(self) -> bool:
return self._is_enum
@property
def is_optional(self) -> bool:
return self._is_optional
@property
def xml_sequence(self) -> int:
return self._xml_sequence
def get_none_value(self, view_: Optional[Type[ViewType]] = None) -> Any:
if not self.include_none:
raise ValueError('No None Value for property that is not include_none')
def is_helper_type(self) -> bool:
ct = self.custom_type
return isclass(ct) and issubclass(ct, BaseHelper)
def is_primitive_type(self) -> bool:
return self.concrete_type in self._PRIMITIVE_TYPES
def parse_type_deferred(self) -> None:
self._parse_type(type_=self._type_)
def _parse_type(self, type_: Any) -> None:
self._type_ = type_ = self._handle_forward_ref(t_=type_)
if type(type_) is str:
type_to_parse = str(type_)
# Handle types that are quoted strings e.g. 'SortedSet[MyObject]' or 'Optional[SortedSet[MyObject]]'
if type_to_parse.startswith('typing.Optional['):
self._is_optional = True
type_to_parse = type_to_parse[16:-1]
elif type_to_parse.startswith('Optional['):
self._is_optional = True
type_to_parse = type_to_parse[9:-1]
match = re_search(r"^(?P<array_type>[\w.]+)\[['\"]?(?P<array_of>\w+)['\"]?]$", type_to_parse)
if match:
results = match.groupdict()
if results.get('array_type') in self._SORTED_CONTAINERS_TYPES:
mapped_array_type = self._SORTED_CONTAINERS_TYPES.get(str(results.get('array_type')))
self._is_array = True
try:
# Will load any class already loaded assuming fully qualified name
self._type_ = eval(f'{mapped_array_type}[{results.get("array_of")}]')
self._concrete_type = eval(str(results.get('array_of')))
except NameError:
# Likely a class that is missing its fully qualified name
_k: Optional[Any] = None
for _k_name, _oml_sc in ObjectMetadataLibrary.klass_mappings.items():
if _oml_sc.name == results.get('array_of'):
_k = _oml_sc.klass
if _k is None:
# Perhaps a custom ENUM?
for _enum_klass in ObjectMetadataLibrary.custom_enum_klasses:
if _enum_klass.__name__ == results.get('array_of'):
_k = _enum_klass
if _k is None:
self._type_ = type_ # type: ignore
self._deferred_type_parsing = True
ObjectMetadataLibrary.defer_property_type_parsing(
prop=self, klasses=[str(results.get('array_of'))]
)
return
self._type_ = mapped_array_type[_k] # type: ignore
self._concrete_type = _k # type: ignore
elif results.get('array_type', '').replace('typing.', '') in self._ARRAY_TYPES:
mapped_array_type = self._ARRAY_TYPES.get(
str(results.get('array_type', '').replace('typing.', ''))
)
self._is_array = True
try:
# Will load any class already loaded assuming fully qualified name
self._type_ = eval(f'{mapped_array_type}[{results.get("array_of")}]')
self._concrete_type = eval(str(results.get('array_of')))
except NameError:
# Likely a class that is missing its fully qualified name
_l: Optional[Any] = None
for _k_name, _oml_sc in ObjectMetadataLibrary.klass_mappings.items():
if _oml_sc.name == results.get('array_of'):
_l = _oml_sc.klass
if _l is None:
# Perhaps a custom ENUM?
for _enum_klass in ObjectMetadataLibrary.custom_enum_klasses:
if _enum_klass.__name__ == results.get('array_of'):
_l = _enum_klass
if _l is None:
self._type_ = type_ # type: ignore
self._deferred_type_parsing = True
ObjectMetadataLibrary.defer_property_type_parsing(
prop=self, klasses=[str(results.get('array_of'))]
)
return
self._type_ = mapped_array_type[_l] # type: ignore
self._concrete_type = _l # type: ignore
else:
raise ValueError(f'Unable to handle Property with declared type: {type_}')
else:
# Handle real types
if len(getattr(self.type_, '__args__', ())) > 1:
# Is this an Optional Property
self._is_optional = type(None) in self.type_.__args__
if self.is_optional:
t, n = self.type_.__args__
if getattr(t, '_name', None) in self._ARRAY_TYPES:
self._is_array = True
t, = t.__args__
self._concrete_type = t
else:
if getattr(self.type_, '_name', None) in self._ARRAY_TYPES:
self._is_array = True
self._concrete_type, = self.type_.__args__
else:
self._concrete_type = self.type_
# Handle Enums
if issubclass(type(self.concrete_type), EnumMeta):
self._is_enum = True
# Ensure marked as not deferred
if self._deferred_type_parsing:
self._deferred_type_parsing = False
def _handle_forward_ref(self, t_: Any) -> Any:
if 'ForwardRef' in str(t_):
return str(t_).replace("ForwardRef('", '"').replace("')", '"')
else:
return t_
def __eq__(self, other: Any) -> bool:
if isinstance(other, ObjectMetadataLibrary.SerializableProperty):
return hash(other) == hash(self)
return False
def __lt__(self, other: Any) -> bool:
if isinstance(other, ObjectMetadataLibrary.SerializableProperty):
return self.xml_sequence < other.xml_sequence
return NotImplemented
def __hash__(self) -> int:
return hash((
self.concrete_type, tuple(self.custom_names), self.custom_type, self.is_array, self.is_enum,
self.is_optional, self.is_xml_attribute, self.name, self.type_,
tuple(self.xml_array_config) if self.xml_array_config else None, self.xml_sequence
))
def __repr__(self) -> str:
return f'<s.oml.SerializableProperty name={self.name}, custom_names={self.custom_names}, ' \
f'array={self.is_array}, enum={self.is_enum}, optional={self.is_optional}, ' \
f'c_type={self.concrete_type}, type={self.type_}, custom_type={self.custom_type}, ' \
f'xml_attr={self.is_xml_attribute}, xml_sequence={self.xml_sequence}>'
@classmethod
def defer_property_type_parsing(cls, prop: 'ObjectMetadataLibrary.SerializableProperty',
klasses: Iterable[str]) -> None:
for _k in klasses:
if _k not in ObjectMetadataLibrary._deferred_property_type_parsing:
ObjectMetadataLibrary._deferred_property_type_parsing[_k] = set()
ObjectMetadataLibrary._deferred_property_type_parsing[_k].add(prop)
@classmethod
def is_klass_serializable(cls, klass: Any) -> bool:
if type(klass) is Type:
return f'{klass.__module__}.{klass.__name__}' in cls.klass_mappings # type: ignore
return klass in cls.klass_mappings
@classmethod
def is_property(cls, o: Any) -> bool:
return isinstance(o, property)
@classmethod
def register_enum(cls, klass: Type[_E]) -> Type[_E]:
cls.custom_enum_klasses.add(klass)
return klass
@classmethod
def register_klass(cls, klass: Type[_T], custom_name: Optional[str],
serialization_types: Iterable[SerializationType],
ignore_during_deserialization: Optional[Iterable[str]] = None
) -> Intersection[Type[_T], Type[_JsonSerializable], Type[_XmlSerializable]]:
if cls.is_klass_serializable(klass=klass):
return klass
cls.klass_mappings[f'{klass.__module__}.{klass.__qualname__}'] = ObjectMetadataLibrary.SerializableClass(
klass=klass, serialization_types=serialization_types,
ignore_during_deserialization=ignore_during_deserialization
)
qualified_class_name = f'{klass.__module__}.{klass.__qualname__}'
cls.klass_property_mappings[qualified_class_name] = {}
_logger.debug('Registering Class %s with custom name %s', qualified_class_name, custom_name)
for name, o in getmembers(klass, ObjectMetadataLibrary.is_property):
qualified_property_name = f'{qualified_class_name}.{name}'
prop_arg_specs = getfullargspec(o.fget)
cls.klass_property_mappings[qualified_class_name][name] = ObjectMetadataLibrary.SerializableProperty(
prop_name=name,
custom_names=ObjectMetadataLibrary._klass_property_names.get(qualified_property_name, {}),
prop_type=prop_arg_specs.annotations.get('return'),
custom_type=ObjectMetadataLibrary._klass_property_types.get(qualified_property_name),
include_none_config=ObjectMetadataLibrary._klass_property_include_none.get(qualified_property_name),
is_xml_attribute=(qualified_property_name in ObjectMetadataLibrary._klass_property_attributes),
string_format_=ObjectMetadataLibrary._klass_property_string_formats.get(qualified_property_name),
views=ObjectMetadataLibrary._klass_property_views.get(qualified_property_name),
xml_array_config=ObjectMetadataLibrary._klass_property_array_config.get(qualified_property_name),
xml_string_config=ObjectMetadataLibrary._klass_property_string_config.get(qualified_property_name),
xml_sequence_=ObjectMetadataLibrary._klass_property_xml_sequence.get(
qualified_property_name,
ObjectMetadataLibrary.SerializableProperty._DEFAULT_XML_SEQUENCE)
)
if SerializationType.JSON in serialization_types:
klass.as_json = _JsonSerializable.as_json # type:ignore[attr-defined]
klass.from_json = classmethod(_JsonSerializable.from_json.__func__) # type:ignore[attr-defined]
if SerializationType.XML in serialization_types:
klass.as_xml = _XmlSerializable.as_xml # type:ignore[attr-defined]
klass.from_xml = classmethod(_XmlSerializable.from_xml.__func__) # type:ignore[attr-defined]
# Handle any deferred Properties depending on this class
for _p in ObjectMetadataLibrary._deferred_property_type_parsing.get(klass.__qualname__, ()):
_p.parse_type_deferred()
return klass
@classmethod
def register_custom_json_property_name(cls, qual_name: str, json_property_name: str) -> None:
prop = cls._klass_property_names.get(qual_name)
if prop is None:
cls._klass_property_names[qual_name] = {SerializationType.JSON: json_property_name}
else:
prop[SerializationType.JSON] = json_property_name
@classmethod
def register_custom_string_format(cls, qual_name: str, string_format: str) -> None:
cls._klass_property_string_formats[qual_name] = string_format
@classmethod
def register_custom_xml_property_name(cls, qual_name: str, xml_property_name: str) -> None:
prop = cls._klass_property_names.get(qual_name)
if prop:
prop[SerializationType.XML] = xml_property_name
else:
cls._klass_property_names[qual_name] = {SerializationType.XML: xml_property_name}
@classmethod
def register_klass_view(cls, klass: Type[_T], view_: Type[ViewType]) -> Type[_T]:
ObjectMetadataLibrary._klass_views[f'{klass.__module__}.{klass.__qualname__}'] = view_
return klass
@classmethod
def register_property_include_none(cls, qual_name: str, view_: Optional[Type[ViewType]] = None,
none_value: Optional[Any] = None) -> None:
prop = cls._klass_property_include_none.get(qual_name)
val = (view_ or ViewType, none_value)
if prop is None:
cls._klass_property_include_none[qual_name] = {val}
else:
prop.add(val)
@classmethod
def register_property_view(cls, qual_name: str, view_: Type[ViewType]) -> None:
prop = ObjectMetadataLibrary._klass_property_views.get(qual_name)
if prop is None:
ObjectMetadataLibrary._klass_property_views[qual_name] = {view_}
else:
prop.add(view_)
@classmethod
def register_xml_property_array_config(cls, qual_name: str,
array_type: XmlArraySerializationType, child_name: str) -> None:
cls._klass_property_array_config[qual_name] = (array_type, child_name)
@classmethod
def register_xml_property_string_config(cls, qual_name: str,
string_type: Optional[XmlStringSerializationType]) -> None:
cls._klass_property_string_config[qual_name] = string_type
@classmethod
def register_xml_property_attribute(cls, qual_name: str) -> None:
cls._klass_property_attributes.add(qual_name)
@classmethod
def register_xml_property_sequence(cls, qual_name: str, sequence: int) -> None:
cls._klass_property_xml_sequence[qual_name] = sequence
@classmethod
def register_property_type_mapping(cls, qual_name: str, mapped_type: type) -> None:
cls._klass_property_types[qual_name] = mapped_type
@overload
def serializable_enum(cls: Literal[None] = None) -> Callable[[Type[_E]], Type[_E]]:
...
@overload
def serializable_enum(cls: Type[_E]) -> Type[_E]: # type:ignore[misc] # mypy on py37
...
def serializable_enum(cls: Optional[Type[_E]] = None) -> Union[
Callable[[Type[_E]], Type[_E]],
Type[_E]
]:
"""Decorator"""
def decorate(kls: Type[_E]) -> Type[_E]:
ObjectMetadataLibrary.register_enum(klass=kls)
return kls
# See if we're being called as @enum or @enum().
if cls is None:
# We're called with parens.
return decorate
# We're called as @register_klass without parens.
return decorate(cls)
@overload
def serializable_class(
cls: Literal[None] = None, *,
name: Optional[str] = ...,
serialization_types: Optional[Iterable[SerializationType]] = ...,
ignore_during_deserialization: Optional[Iterable[str]] = ...
) -> Callable[[Type[_T]], Intersection[Type[_T], Type[_JsonSerializable], Type[_XmlSerializable]]]:
...
@overload
def serializable_class( # type:ignore[misc] # mypy on py37
cls: Type[_T], *,
name: Optional[str] = ...,
serialization_types: Optional[Iterable[SerializationType]] = ...,
ignore_during_deserialization: Optional[Iterable[str]] = ...
) -> Intersection[Type[_T], Type[_JsonSerializable], Type[_XmlSerializable]]:
...
def serializable_class(
cls: Optional[Type[_T]] = None, *,
name: Optional[str] = None,
serialization_types: Optional[Iterable[SerializationType]] = None,
ignore_during_deserialization: Optional[Iterable[str]] = None
) -> Union[
Callable[[Type[_T]], Intersection[Type[_T], Type[_JsonSerializable], Type[_XmlSerializable]]],
Intersection[Type[_T], Type[_JsonSerializable], Type[_XmlSerializable]]
]:
"""
Decorator used to tell ``py_serializable`` that a class is to be included in (de-)serialization.
:param cls: Class
:param name: Alternative name to use for this Class
:param serialization_types: Serialization Types that are to be supported for this class.
:param ignore_during_deserialization: List of properties/elements to ignore during deserialization
:return:
"""
if serialization_types is None:
serialization_types = _DEFAULT_SERIALIZATION_TYPES
def decorate(kls: Type[_T]) -> Intersection[Type[_T], Type[_JsonSerializable], Type[_XmlSerializable]]:
ObjectMetadataLibrary.register_klass(
klass=kls, custom_name=name, serialization_types=serialization_types or [],
ignore_during_deserialization=ignore_during_deserialization
)
return kls
# See if we're being called as @register_klass or @register_klass().
if cls is None:
# We're called with parens.
return decorate
# We're called as @register_klass without parens.
return decorate(cls)
def type_mapping(type_: type) -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s with custom type: %s', f.__module__, f.__qualname__, type_)
ObjectMetadataLibrary.register_property_type_mapping(
qual_name=f'{f.__module__}.{f.__qualname__}', mapped_type=type_
)
return f
return decorate
def include_none(view_: Optional[Type[ViewType]] = None, none_value: Optional[Any] = None) -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s to include None for view: %s', f.__module__, f.__qualname__, view_)
ObjectMetadataLibrary.register_property_include_none(
qual_name=f'{f.__module__}.{f.__qualname__}', view_=view_, none_value=none_value
)
return f
return decorate
def json_name(name: str) -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s with JSON name: %s', f.__module__, f.__qualname__, name)
ObjectMetadataLibrary.register_custom_json_property_name(
qual_name=f'{f.__module__}.{f.__qualname__}', json_property_name=name
)
return f
return decorate
def string_format(format_: str) -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s with String Format: %s', f.__module__, f.__qualname__, format_)
ObjectMetadataLibrary.register_custom_string_format(
qual_name=f'{f.__module__}.{f.__qualname__}', string_format=format_
)
return f
return decorate
def view(view_: Type[ViewType]) -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s with View: %s', f.__module__, f.__qualname__, view_)
ObjectMetadataLibrary.register_property_view(
qual_name=f'{f.__module__}.{f.__qualname__}', view_=view_
)
return f
return decorate
def xml_attribute() -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s as XML attribute', f.__module__, f.__qualname__)
ObjectMetadataLibrary.register_xml_property_attribute(qual_name=f'{f.__module__}.{f.__qualname__}')
return f
return decorate
def xml_array(array_type: XmlArraySerializationType, child_name: str) -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s as XML Array: %s:%s', f.__module__, f.__qualname__, array_type, child_name)
ObjectMetadataLibrary.register_xml_property_array_config(
qual_name=f'{f.__module__}.{f.__qualname__}', array_type=array_type, child_name=child_name
)
return f
return decorate
def xml_string(string_type: XmlStringSerializationType) -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s as XML StringType: %s', f.__module__, f.__qualname__, string_type)
ObjectMetadataLibrary.register_xml_property_string_config(
qual_name=f'{f.__module__}.{f.__qualname__}', string_type=string_type
)
return f
return decorate
def xml_name(name: str) -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s with XML name: %s', f.__module__, f.__qualname__, name)
ObjectMetadataLibrary.register_custom_xml_property_name(
qual_name=f'{f.__module__}.{f.__qualname__}', xml_property_name=name
)
return f
return decorate
def xml_sequence(sequence: int) -> Callable[[_F], _F]:
"""Decorator"""
def decorate(f: _F) -> _F:
_logger.debug('Registering %s.%s with XML sequence: %s', f.__module__, f.__qualname__, sequence)
ObjectMetadataLibrary.register_xml_property_sequence(
qual_name=f'{f.__module__}.{f.__qualname__}', sequence=sequence
)
return f
return decorate
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