# --------------------------------------------------------------------------
#
# Copyright (c) Microsoft Corporation. All rights reserved.
#
# The MIT License (MIT)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the ""Software""), to
# deal in the Software without restriction, including without limitation the
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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from base64 import b64decode, b64encode
import calendar
import datetime
import decimal
from enum import Enum
import json
import logging
import re
import sys
try:
from urllib import quote # type: ignore
except ImportError:
from urllib.parse import quote # type: ignore
import xml.etree.ElementTree as ET
import isodate
from typing import Dict, Any
from .exceptions import (
ValidationError,
SerializationError,
DeserializationError,
raise_with_traceback)
try:
basestring # type: ignore
unicode_str = unicode # type: ignore
except NameError:
basestring = str # type: ignore
unicode_str = str # type: ignore
_LOGGER = logging.getLogger(__name__)
try:
_long_type = long # type: ignore
except NameError:
_long_type = int
class UTC(datetime.tzinfo):
"""Time Zone info for handling UTC"""
def utcoffset(self, dt):
"""UTF offset for UTC is 0."""
return datetime.timedelta(0)
def tzname(self, dt):
"""Timestamp representation."""
return "Z"
def dst(self, dt):
"""No daylight saving for UTC."""
return datetime.timedelta(hours=1)
try:
from datetime import timezone
TZ_UTC = timezone.utc # type: ignore
except ImportError:
TZ_UTC = UTC() # type: ignore
_FLATTEN = re.compile(r"(?<!\\)\.")
def attribute_transformer(key, attr_desc, value):
"""A key transformer that returns the Python attribute.
:param str key: The attribute name
:param dict attr_desc: The attribute metadata
:param object value: The value
:returns: A key using attribute name
"""
return (key, value)
def full_restapi_key_transformer(key, attr_desc, value):
"""A key transformer that returns the full RestAPI key path.
:param str _: The attribute name
:param dict attr_desc: The attribute metadata
:param object value: The value
:returns: A list of keys using RestAPI syntax.
"""
keys = _FLATTEN.split(attr_desc['key'])
return ([_decode_attribute_map_key(k) for k in keys], value)
def last_restapi_key_transformer(key, attr_desc, value):
"""A key transformer that returns the last RestAPI key.
:param str key: The attribute name
:param dict attr_desc: The attribute metadata
:param object value: The value
:returns: The last RestAPI key.
"""
key, value = full_restapi_key_transformer(key, attr_desc, value)
return (key[-1], value)
def _recursive_validate(attr_name, attr_type, data):
result = []
if attr_type.startswith('[') and data is not None:
for content in data:
result += _recursive_validate(attr_name+" content", attr_type[1:-1], content)
elif attr_type.startswith('{') and data is not None:
if not hasattr(data, 'values'):
raise ValidationError("type", attr_name, attr_type)
for content in data.values():
result += _recursive_validate(attr_name+" content", attr_type[1:-1], content)
elif hasattr(data, '_validation'):
return data.validate()
return result
def _create_xml_node(tag, prefix=None, ns=None):
"""Create a XML node."""
if prefix and ns:
ET.register_namespace(prefix, ns)
if ns:
return ET.Element("{"+ns+"}"+tag)
else:
return ET.Element(tag)
class Model(object):
"""Mixin for all client request body/response body models to support
serialization and deserialization.
"""
_subtype_map = {} # type: Dict[str, Dict[str, Any]]
_attribute_map = {} # type: Dict[str, Dict[str, Any]]
_validation = {} # type: Dict[str, Dict[str, Any]]
def __init__(self, **kwargs):
self.additional_properties = {}
for k in kwargs:
if k not in self._attribute_map:
_LOGGER.warning("%s is not a known attribute of class %s and will be ignored", k, self.__class__)
elif k in self._validation and self._validation[k].get("readonly", False):
_LOGGER.warning("Readonly attribute %s will be ignored in class %s", k, self.__class__)
else:
setattr(self, k, kwargs[k])
def __eq__(self, other):
"""Compare objects by comparing all attributes."""
if isinstance(other, self.__class__):
return self.__dict__ == other.__dict__
return False
def __ne__(self, other):
"""Compare objects by comparing all attributes."""
return not self.__eq__(other)
def __str__(self):
return str(self.__dict__)
@classmethod
def enable_additional_properties_sending(cls):
cls._attribute_map['additional_properties'] = {'key': '', 'type': '{object}'}
@classmethod
def is_xml_model(cls):
try:
cls._xml_map
except AttributeError:
return False
return True
@classmethod
def _create_xml_node(cls):
"""Create XML node from "_xml_map".
"""
try:
xml_map = cls._xml_map
except AttributeError:
raise ValueError("This model has no XML definition")
return _create_xml_node(
xml_map.get('name', cls.__name__),
xml_map.get("prefix", None),
xml_map.get("ns", None)
)
def validate(self):
"""Validate this model recursively and return a list of ValidationError.
:returns: A list of validation error
:rtype: list
"""
validation_result = []
for attr_name, value in [(attr, getattr(self, attr)) for attr in self._attribute_map]:
attr_desc = self._attribute_map[attr_name]
if attr_name == "additional_properties" and attr_desc["key"] == '':
# Do NOT validate additional_properties
continue
attr_type = attr_desc['type']
try:
debug_name = "{}.{}".format(self.__class__.__name__, attr_name)
Serializer.validate(value, debug_name, **self._validation.get(attr_name, {}))
except ValidationError as validation_error:
validation_result.append(validation_error)
validation_result += _recursive_validate(attr_name, attr_type, value)
return validation_result
def serialize(self, keep_readonly=False):
"""Return the JSON that would be sent to azure from this model.
This is an alias to `as_dict(full_restapi_key_transformer, keep_readonly=False)`.
:param bool keep_readonly: If you want to serialize the readonly attributes
:returns: A dict JSON compatible object
:rtype: dict
"""
serializer = Serializer(self._infer_class_models())
return serializer._serialize(self, keep_readonly=keep_readonly)
def as_dict(self, keep_readonly=True, key_transformer=attribute_transformer):
"""Return a dict that can be JSONify using json.dump.
Advanced usage might optionaly use a callback as parameter:
.. code::python
def my_key_transformer(key, attr_desc, value):
return key
Key is the attribute name used in Python. Attr_desc
is a dict of metadata. Currently contains 'type' with the
msrest type and 'key' with the RestAPI encoded key.
Value is the current value in this object.
The string returned will be used to serialize the key.
If the return type is a list, this is considered hierarchical
result dict.
See the three examples in this file:
- attribute_transformer
- full_restapi_key_transformer
- last_restapi_key_transformer
:param function key_transformer: A key transformer function.
:returns: A dict JSON compatible object
:rtype: dict
"""
serializer = Serializer(self._infer_class_models())
return serializer._serialize(self, key_transformer=key_transformer, keep_readonly=keep_readonly)
@classmethod
def _infer_class_models(cls):
try:
str_models = cls.__module__.rsplit('.', 1)[0]
models = sys.modules[str_models]
client_models = {k: v for k, v in models.__dict__.items() if isinstance(v, type)}
if cls.__name__ not in client_models:
raise ValueError("Not Autorest generated code")
except Exception:
# Assume it's not Autorest generated (tests?). Add ourselves as dependencies.
client_models = {cls.__name__: cls}
return client_models
@classmethod
def deserialize(cls, data, content_type=None):
"""Parse a str using the RestAPI syntax and return a model.
:param str data: A str using RestAPI structure. JSON by default.
:param str content_type: JSON by default, set application/xml if XML.
:returns: An instance of this model
:raises: DeserializationError if something went wrong
"""
deserializer = Deserializer(cls._infer_class_models())
return deserializer(cls.__name__, data, content_type=content_type)
@classmethod
def from_dict(cls, data, key_extractors=None, content_type=None):
"""Parse a dict using given key extractor return a model.
By default consider key
extractors (rest_key_case_insensitive_extractor, attribute_key_case_insensitive_extractor
and last_rest_key_case_insensitive_extractor)
:param dict data: A dict using RestAPI structure
:param str content_type: JSON by default, set application/xml if XML.
:returns: An instance of this model
:raises: DeserializationError if something went wrong
"""
deserializer = Deserializer(cls._infer_class_models())
deserializer.key_extractors = [
rest_key_case_insensitive_extractor,
attribute_key_case_insensitive_extractor,
last_rest_key_case_insensitive_extractor
] if key_extractors is None else key_extractors
return deserializer(cls.__name__, data, content_type=content_type)
@classmethod
def _flatten_subtype(cls, key, objects):
if '_subtype_map' not in cls.__dict__:
return {}
result = dict(cls._subtype_map[key])
for valuetype in cls._subtype_map[key].values():
result.update(objects[valuetype]._flatten_subtype(key, objects))
return result
@classmethod
def _classify(cls, response, objects):
"""Check the class _subtype_map for any child classes.
We want to ignore any inherited _subtype_maps.
Remove the polymorphic key from the initial data.
"""
for subtype_key in cls.__dict__.get('_subtype_map', {}).keys():
subtype_value = None
rest_api_response_key = cls._get_rest_key_parts(subtype_key)[-1]
subtype_value = response.pop(rest_api_response_key, None) or response.pop(subtype_key, None)
if subtype_value:
# Try to match base class. Can be class name only
# (bug to fix in Autorest to support x-ms-discriminator-name)
if cls.__name__ == subtype_value:
return cls
flatten_mapping_type = cls._flatten_subtype(subtype_key, objects)
try:
return objects[flatten_mapping_type[subtype_value]]
except KeyError:
_LOGGER.warning(
"Subtype value %s has no mapping, use base class %s.",
subtype_value,
cls.__name__,
)
break
else:
_LOGGER.warning(
"Discriminator %s is absent or null, use base class %s.",
subtype_key,
cls.__name__
)
break
return cls
@classmethod
def _get_rest_key_parts(cls, attr_key):
"""Get the RestAPI key of this attr, split it and decode part
:param str attr_key: Attribute key must be in attribute_map.
:returns: A list of RestAPI part
:rtype: list
"""
rest_split_key = _FLATTEN.split(cls._attribute_map[attr_key]['key'])
return [_decode_attribute_map_key(key_part) for key_part in rest_split_key]
def _decode_attribute_map_key(key):
"""This decode a key in an _attribute_map to the actual key we want to look at
inside the received data.
:param str key: A key string from the generated code
"""
return key.replace('\\.', '.')
class Serializer(object):
"""Request object model serializer."""
basic_types = {str: 'str', int: 'int', bool: 'bool', float: 'float'}
_xml_basic_types_serializers = {'bool': lambda x:str(x).lower()}
days = {0: "Mon", 1: "Tue", 2: "Wed", 3: "Thu",
4: "Fri", 5: "Sat", 6: "Sun"}
months = {1: "Jan", 2: "Feb", 3: "Mar", 4: "Apr", 5: "May", 6: "Jun",
7: "Jul", 8: "Aug", 9: "Sep", 10: "Oct", 11: "Nov", 12: "Dec"}
validation = {
"min_length": lambda x, y: len(x) < y,
"max_length": lambda x, y: len(x) > y,
"minimum": lambda x, y: x < y,
"maximum": lambda x, y: x > y,
"minimum_ex": lambda x, y: x <= y,
"maximum_ex": lambda x, y: x >= y,
"min_items": lambda x, y: len(x) < y,
"max_items": lambda x, y: len(x) > y,
"pattern": lambda x, y: not re.match(y, x, re.UNICODE),
"unique": lambda x, y: len(x) != len(set(x)),
"multiple": lambda x, y: x % y != 0
}
def __init__(self, classes=None):
self.serialize_type = {
'iso-8601': Serializer.serialize_iso,
'rfc-1123': Serializer.serialize_rfc,
'unix-time': Serializer.serialize_unix,
'duration': Serializer.serialize_duration,
'date': Serializer.serialize_date,
'decimal': Serializer.serialize_decimal,
'long': Serializer.serialize_long,
'bytearray': Serializer.serialize_bytearray,
'base64': Serializer.serialize_base64,
'object': self.serialize_object,
'[]': self.serialize_iter,
'{}': self.serialize_dict
}
self.dependencies = dict(classes) if classes else {}
self.key_transformer = full_restapi_key_transformer
self.client_side_validation = True
def _serialize(self, target_obj, data_type=None, **kwargs):
"""Serialize data into a string according to type.
:param target_obj: The data to be serialized.
:param str data_type: The type to be serialized from.
:rtype: str, dict
:raises: SerializationError if serialization fails.
"""
key_transformer = kwargs.get("key_transformer", self.key_transformer)
keep_readonly = kwargs.get("keep_readonly", False)
if target_obj is None:
return None
attr_name = None
class_name = target_obj.__class__.__name__
if data_type:
return self.serialize_data(
target_obj, data_type, **kwargs)
if not hasattr(target_obj, "_attribute_map"):
data_type = type(target_obj).__name__
if data_type in self.basic_types.values():
return self.serialize_data(
target_obj, data_type, **kwargs)
# Force "is_xml" kwargs if we detect a XML model
try:
is_xml_model_serialization = kwargs["is_xml"]
except KeyError:
is_xml_model_serialization = kwargs.setdefault("is_xml", target_obj.is_xml_model())
serialized = {}
if is_xml_model_serialization:
serialized = target_obj._create_xml_node()
try:
attributes = target_obj._attribute_map
for attr, attr_desc in attributes.items():
attr_name = attr
if not keep_readonly and target_obj._validation.get(attr_name, {}).get('readonly', False):
continue
if attr_name == "additional_properties" and attr_desc["key"] == '':
if target_obj.additional_properties is not None:
serialized.update(target_obj.additional_properties)
continue
try:
### Extract sub-data to serialize from model ###
orig_attr = getattr(target_obj, attr)
if is_xml_model_serialization:
pass # Don't provide "transformer" for XML for now. Keep "orig_attr"
else: # JSON
keys, orig_attr = key_transformer(attr, attr_desc.copy(), orig_attr)
keys = keys if isinstance(keys, list) else [keys]
### Serialize this data ###
kwargs["serialization_ctxt"] = attr_desc
new_attr = self.serialize_data(orig_attr, attr_desc['type'], **kwargs)
### Incorporate this data in the right place ###
if is_xml_model_serialization:
xml_desc = attr_desc['xml']
xml_name = xml_desc['name']
if "attr" in xml_desc and xml_desc["attr"]:
serialized.set(xml_name, new_attr)
continue
if isinstance(new_attr, list):
serialized.extend(new_attr)
elif isinstance(new_attr, ET.Element):
# If the down XML has no XML/Name, we MUST replace the tag with the local tag. But keeping the namespaces.
if 'name' not in getattr(orig_attr, '_xml_map', {}):
splitted_tag = new_attr.tag.split("}")
if len(splitted_tag) == 2: # Namespace
new_attr.tag = "}".join([splitted_tag[0], xml_name])
else:
new_attr.tag = xml_name
serialized.append(new_attr)
else: # That's a basic type
# Integrate namespace if necessary
local_node = _create_xml_node(
xml_name,
xml_desc.get('prefix', None),
xml_desc.get('ns', None)
)
local_node.text = unicode_str(new_attr)
serialized.append(local_node)
else: # JSON
for k in reversed(keys):
unflattened = {k: new_attr}
new_attr = unflattened
_new_attr = new_attr
_serialized = serialized
for k in keys:
if k not in _serialized:
_serialized.update(_new_attr)
_new_attr = _new_attr[k]
_serialized = _serialized[k]
except ValueError:
continue
except (AttributeError, KeyError, TypeError) as err:
msg = "Attribute {} in object {} cannot be serialized.\n{}".format(
attr_name, class_name, str(target_obj))
raise_with_traceback(SerializationError, msg, err)
else:
return serialized
def body(self, data, data_type, **kwargs):
"""Serialize data intended for a request body.
:param data: The data to be serialized.
:param str data_type: The type to be serialized from.
:rtype: dict
:raises: SerializationError if serialization fails.
:raises: ValueError if data is None
"""
if data is None:
raise ValidationError("required", "body", True)
# Just in case this is a dict
internal_data_type = data_type.strip('[]{}')
internal_data_type = self.dependencies.get(internal_data_type, None)
try:
is_xml_model_serialization = kwargs["is_xml"]
except KeyError:
if internal_data_type and issubclass(internal_data_type, Model):
is_xml_model_serialization = kwargs.setdefault("is_xml", internal_data_type.is_xml_model())
else:
is_xml_model_serialization = False
if internal_data_type and not isinstance(internal_data_type, Enum):
try:
deserializer = Deserializer(self.dependencies)
# Since it's on serialization, it's almost sure that format is not JSON REST
# We're not able to deal with additional properties for now.
deserializer.additional_properties_detection = False
if is_xml_model_serialization:
deserializer.key_extractors = [
attribute_key_case_insensitive_extractor,
]
else:
deserializer.key_extractors = [
rest_key_case_insensitive_extractor,
attribute_key_case_insensitive_extractor,
last_rest_key_case_insensitive_extractor
]
data = deserializer._deserialize(data_type, data)
except DeserializationError as err:
raise_with_traceback(
SerializationError, "Unable to build a model: "+str(err), err)
if self.client_side_validation:
errors = _recursive_validate(data_type, data_type, data)
if errors:
raise errors[0]
return self._serialize(data, data_type, **kwargs)
def url(self, name, data, data_type, **kwargs):
"""Serialize data intended for a URL path.
:param data: The data to be serialized.
:param str data_type: The type to be serialized from.
:rtype: str
:raises: TypeError if serialization fails.
:raises: ValueError if data is None
"""
if self.client_side_validation:
data = self.validate(data, name, required=True, **kwargs)
try:
output = self.serialize_data(data, data_type, **kwargs)
if data_type == 'bool':
output = json.dumps(output)
if kwargs.get('skip_quote') is True:
output = str(output)
else:
output = quote(str(output), safe='')
except SerializationError:
raise TypeError("{} must be type {}.".format(name, data_type))
else:
return output
def query(self, name, data, data_type, **kwargs):
"""Serialize data intended for a URL query.
:param data: The data to be serialized.
:param str data_type: The type to be serialized from.
:rtype: str
:raises: TypeError if serialization fails.
:raises: ValueError if data is None
"""
if self.client_side_validation:
data = self.validate(data, name, required=True, **kwargs)
try:
if data_type in ['[str]']:
data = ["" if d is None else d for d in data]
output = self.serialize_data(data, data_type, **kwargs)
if data_type == 'bool':
output = json.dumps(output)
if kwargs.get('skip_quote') is True:
output = str(output)
else:
output = quote(str(output), safe='')
except SerializationError:
raise TypeError("{} must be type {}.".format(name, data_type))
else:
return str(output)
def header(self, name, data, data_type, **kwargs):
"""Serialize data intended for a request header.
:param data: The data to be serialized.
:param str data_type: The type to be serialized from.
:rtype: str
:raises: TypeError if serialization fails.
:raises: ValueError if data is None
"""
if self.client_side_validation:
data = self.validate(data, name, required=True, **kwargs)
try:
if data_type in ['[str]']:
data = ["" if d is None else d for d in data]
output = self.serialize_data(data, data_type, **kwargs)
if data_type == 'bool':
output = json.dumps(output)
except SerializationError:
raise TypeError("{} must be type {}.".format(name, data_type))
else:
return str(output)
@classmethod
def validate(cls, data, name, **kwargs):
"""Validate that a piece of data meets certain conditions"""
required = kwargs.get('required', False)
if required and data is None:
raise ValidationError("required", name, True)
elif data is None:
return
elif kwargs.get('readonly'):
return
try:
for key, value in kwargs.items():
validator = cls.validation.get(key, lambda x, y: False)
if validator(data, value):
raise ValidationError(key, name, value)
except TypeError:
raise ValidationError("unknown", name, "unknown")
else:
return data
def serialize_data(self, data, data_type, **kwargs):
"""Serialize generic data according to supplied data type.
:param data: The data to be serialized.
:param str data_type: The type to be serialized from.
:param bool required: Whether it's essential that the data not be
empty or None
:raises: AttributeError if required data is None.
:raises: ValueError if data is None
:raises: SerializationError if serialization fails.
"""
if data is None:
raise ValueError("No value for given attribute")
try:
if data_type in self.basic_types.values():
return self.serialize_basic(data, data_type, **kwargs)
elif data_type in self.serialize_type:
return self.serialize_type[data_type](data, **kwargs)
# If dependencies is empty, try with current data class
# It has to be a subclass of Enum anyway
enum_type = self.dependencies.get(data_type, data.__class__)
if issubclass(enum_type, Enum):
return Serializer.serialize_enum(data, enum_obj=enum_type)
iter_type = data_type[0] + data_type[-1]
if iter_type in self.serialize_type:
return self.serialize_type[iter_type](
data, data_type[1:-1], **kwargs)
except (ValueError, TypeError) as err:
msg = "Unable to serialize value: {!r} as type: {!r}."
raise_with_traceback(
SerializationError, msg.format(data, data_type), err)
else:
return self._serialize(data, **kwargs)
def _get_custom_serializers(self, data_type, **kwargs):
custom_serializer = kwargs.get("basic_types_serializers", {}).get(data_type)
if custom_serializer:
return custom_serializer
if kwargs.get("is_xml", False):
return self._xml_basic_types_serializers.get(data_type)
def serialize_basic(self, data, data_type, **kwargs):
"""Serialize basic builting data type.
Serializes objects to str, int, float or bool.
Possible kwargs:
- basic_types_serializers dict[str, callable] : If set, use the callable as serializer
- is_xml bool : If set, use xml_basic_types_serializers
:param data: Object to be serialized.
:param str data_type: Type of object in the iterable.
"""
custom_serializer = self._get_custom_serializers(data_type, **kwargs)
if custom_serializer:
return custom_serializer(data)
if data_type == 'str':
return self.serialize_unicode(data)
return eval(data_type)(data)
def serialize_unicode(self, data):
"""Special handling for serializing unicode strings in Py2.
Encode to UTF-8 if unicode, otherwise handle as a str.
:param data: Object to be serialized.
:rtype: str
"""
try: # If I received an enum, return its value
return data.value
except AttributeError:
pass
try:
if isinstance(data, unicode):
# Don't change it, JSON and XML ElementTree are totally able
# to serialize correctly u'' strings
return data
except NameError:
return str(data)
else:
return str(data)
def serialize_iter(self, data, iter_type, div=None, **kwargs):
"""Serialize iterable.
Supported kwargs:
serialization_ctxt dict : The current entry of _attribute_map, or same format. serialization_ctxt['type'] should be same as data_type.
:param list attr: Object to be serialized.
:param str iter_type: Type of object in the iterable.
:param bool required: Whether the objects in the iterable must
not be None or empty.
:param str div: If set, this str will be used to combine the elements
in the iterable into a combined string. Default is 'None'.
:rtype: list, str
"""
if isinstance(data, str):
raise SerializationError("Refuse str type as a valid iter type.")
serialization_ctxt = kwargs.get("serialization_ctxt", {})
serialized = []
for d in data:
try:
serialized.append(self.serialize_data(d, iter_type, **kwargs))
except ValueError:
serialized.append(None)
if div:
serialized = ['' if s is None else str(s) for s in serialized]
serialized = div.join(serialized)
if 'xml' in serialization_ctxt:
# XML serialization is more complicated
xml_desc = serialization_ctxt['xml']
xml_name = xml_desc['name']
# Create a wrap node if necessary (use the fact that Element and list have "append")
is_wrapped = "wrapped" in xml_desc and xml_desc["wrapped"]
node_name = xml_desc.get("itemsName", xml_name)
if is_wrapped:
final_result = _create_xml_node(
xml_name,
xml_desc.get('prefix', None),
xml_desc.get('ns', None)
)
else:
final_result = []
# All list elements to "local_node"
for el in serialized:
if isinstance(el, ET.Element):
el_node = el
else:
el_node = _create_xml_node(
node_name,
xml_desc.get('prefix', None),
xml_desc.get('ns', None)
)
if el is not None: # Otherwise it writes "None" :-p
el_node.text = str(el)
final_result.append(el_node)
return final_result
return serialized
def serialize_dict(self, attr, dict_type, **kwargs):
"""Serialize a dictionary of objects.
:param dict attr: Object to be serialized.
:param str dict_type: Type of object in the dictionary.
:param bool required: Whether the objects in the dictionary must
not be None or empty.
:rtype: dict
"""
serialization_ctxt = kwargs.get("serialization_ctxt", {})
serialized = {}
for key, value in attr.items():
try:
serialized[self.serialize_unicode(key)] = self.serialize_data(
value, dict_type, **kwargs)
except ValueError:
serialized[self.serialize_unicode(key)] = None
if 'xml' in serialization_ctxt:
# XML serialization is more complicated
xml_desc = serialization_ctxt['xml']
xml_name = xml_desc['name']
final_result = _create_xml_node(
xml_name,
xml_desc.get('prefix', None),
xml_desc.get('ns', None)
)
for key, value in serialized.items():
ET.SubElement(final_result, key).text = value
return final_result
return serialized
def serialize_object(self, attr, **kwargs):
"""Serialize a generic object.
This will be handled as a dictionary. If object passed in is not
a basic type (str, int, float, dict, list) it will simply be
cast to str.
:param dict attr: Object to be serialized.
:rtype: dict or str
"""
if attr is None:
return None
if isinstance(attr, ET.Element):
return attr
obj_type = type(attr)
if obj_type in self.basic_types:
return self.serialize_basic(attr, self.basic_types[obj_type], **kwargs)
if obj_type is _long_type:
return self.serialize_long(attr)
# If it's a model or I know this dependency, serialize as a Model
elif obj_type in self.dependencies.values() or isinstance(obj_type, Model):
return self._serialize(attr)
if obj_type == dict:
serialized = {}
for key, value in attr.items():
try:
serialized[self.serialize_unicode(key)] = self.serialize_object(
value, **kwargs)
except ValueError:
serialized[self.serialize_unicode(key)] = None
return serialized
if obj_type == list:
serialized = []
for obj in attr:
try:
serialized.append(self.serialize_object(
obj, **kwargs))
except ValueError:
pass
return serialized
return str(attr)
@staticmethod
def serialize_enum(attr, enum_obj=None):
try:
result = attr.value
except AttributeError:
result = attr
try:
enum_obj(result)
return result
except ValueError:
for enum_value in enum_obj:
if enum_value.value.lower() == str(attr).lower():
return enum_value.value
error = "{!r} is not valid value for enum {!r}"
raise SerializationError(error.format(attr, enum_obj))
@staticmethod
def serialize_bytearray(attr, **kwargs):
"""Serialize bytearray into base-64 string.
:param attr: Object to be serialized.
:rtype: str
"""
return b64encode(attr).decode()
@staticmethod
def serialize_base64(attr, **kwargs):
"""Serialize str into base-64 string.
:param attr: Object to be serialized.
:rtype: str
"""
encoded = b64encode(attr).decode('ascii')
return encoded.strip('=').replace('+', '-').replace('/', '_')
@staticmethod
def serialize_decimal(attr, **kwargs):
"""Serialize Decimal object to float.
:param attr: Object to be serialized.
:rtype: float
"""
return float(attr)
@staticmethod
def serialize_long(attr, **kwargs):
"""Serialize long (Py2) or int (Py3).
:param attr: Object to be serialized.
:rtype: int/long
"""
return _long_type(attr)
@staticmethod
def serialize_date(attr, **kwargs):
"""Serialize Date object into ISO-8601 formatted string.
:param Date attr: Object to be serialized.
:rtype: str
"""
if isinstance(attr, str):
attr = isodate.parse_date(attr)
t = "{:04}-{:02}-{:02}".format(attr.year, attr.month, attr.day)
return t
@staticmethod
def serialize_duration(attr, **kwargs):
"""Serialize TimeDelta object into ISO-8601 formatted string.
:param TimeDelta attr: Object to be serialized.
:rtype: str
"""
if isinstance(attr, str):
attr = isodate.parse_duration(attr)
return isodate.duration_isoformat(attr)
@staticmethod
def serialize_rfc(attr, **kwargs):
"""Serialize Datetime object into RFC-1123 formatted string.
:param Datetime attr: Object to be serialized.
:rtype: str
:raises: TypeError if format invalid.
"""
try:
if not attr.tzinfo:
_LOGGER.warning(
"Datetime with no tzinfo will be considered UTC.")
utc = attr.utctimetuple()
except AttributeError:
raise TypeError("RFC1123 object must be valid Datetime object.")
return "{}, {:02} {} {:04} {:02}:{:02}:{:02} GMT".format(
Serializer.days[utc.tm_wday], utc.tm_mday,
Serializer.months[utc.tm_mon], utc.tm_year,
utc.tm_hour, utc.tm_min, utc.tm_sec)
@staticmethod
def serialize_iso(attr, **kwargs):
"""Serialize Datetime object into ISO-8601 formatted string.
:param Datetime attr: Object to be serialized.
:rtype: str
:raises: SerializationError if format invalid.
"""
if isinstance(attr, str):
attr = isodate.parse_datetime(attr)
try:
if not attr.tzinfo:
_LOGGER.warning(
"Datetime with no tzinfo will be considered UTC.")
utc = attr.utctimetuple()
if utc.tm_year > 9999 or utc.tm_year < 1:
raise OverflowError("Hit max or min date")
microseconds = str(attr.microsecond).rjust(6,'0').rstrip('0').ljust(3, '0')
if microseconds:
microseconds = '.'+microseconds
date = "{:04}-{:02}-{:02}T{:02}:{:02}:{:02}".format(
utc.tm_year, utc.tm_mon, utc.tm_mday,
utc.tm_hour, utc.tm_min, utc.tm_sec)
return date + microseconds + 'Z'
except (ValueError, OverflowError) as err:
msg = "Unable to serialize datetime object."
raise_with_traceback(SerializationError, msg, err)
except AttributeError as err:
msg = "ISO-8601 object must be valid Datetime object."
raise_with_traceback(TypeError, msg, err)
@staticmethod
def serialize_unix(attr, **kwargs):
"""Serialize Datetime object into IntTime format.
This is represented as seconds.
:param Datetime attr: Object to be serialized.
:rtype: int
:raises: SerializationError if format invalid
"""
if isinstance(attr, int):
return attr
try:
if not attr.tzinfo:
_LOGGER.warning(
"Datetime with no tzinfo will be considered UTC.")
return int(calendar.timegm(attr.utctimetuple()))
except AttributeError:
raise TypeError("Unix time object must be valid Datetime object.")
def rest_key_extractor(attr, attr_desc, data):
key = attr_desc['key']
working_data = data
while '.' in key:
dict_keys = _FLATTEN.split(key)
if len(dict_keys) == 1:
key = _decode_attribute_map_key(dict_keys[0])
break
working_key = _decode_attribute_map_key(dict_keys[0])
working_data = working_data.get(working_key, data)
key = '.'.join(dict_keys[1:])
return working_data.get(key)
def rest_key_case_insensitive_extractor(attr, attr_desc, data):
key = attr_desc['key']
working_data = data
while '.' in key:
dict_keys = _FLATTEN.split(key)
if len(dict_keys) == 1:
key = _decode_attribute_map_key(dict_keys[0])
break
working_key = _decode_attribute_map_key(dict_keys[0])
working_data = attribute_key_case_insensitive_extractor(working_key, None, working_data)
key = '.'.join(dict_keys[1:])
if working_data:
return attribute_key_case_insensitive_extractor(key, None, working_data)
def last_rest_key_extractor(attr, attr_desc, data):
key = attr_desc['key']
dict_keys = _FLATTEN.split(key)
return attribute_key_extractor(dict_keys[-1], None, data)
def last_rest_key_case_insensitive_extractor(attr, attr_desc, data):
key = attr_desc['key']
dict_keys = _FLATTEN.split(key)
return attribute_key_case_insensitive_extractor(dict_keys[-1], None, data)
def attribute_key_extractor(attr, _, data):
return data.get(attr)
def attribute_key_case_insensitive_extractor(attr, _, data):
found_key = None
lower_attr = attr.lower()
for key in data:
if lower_attr == key.lower():
found_key = key
break
return data.get(found_key)
def xml_key_extractor(attr, attr_desc, data):
# Test if this model is XML ready first
if 'xml' not in attr_desc:
return None
if isinstance(data, dict):
return None
xml_desc = attr_desc['xml']
xml_name = xml_desc['name']
xml_ns = xml_desc.get('ns', None)
# If it's an attribute, that's simple
if "attr" in xml_desc and xml_desc["attr"]:
return data.get(xml_name)
# Integrate namespace if necessary
if xml_ns:
ns = {'prefix': xml_ns}
xml_name = "prefix:"+xml_name
else:
ns = {} # And keep same xml_name
# Look for a children
is_iter_type = attr_desc['type'].startswith("[")
is_wrapped = "wrapped" in xml_desc and xml_desc["wrapped"]
internal_type = attr_desc.get("internalType", None)
# Scenario where I take the local name:
# - Wrapped node
# - Internal type is an enum (considered basic types)
# - Internal type has no XML/Name node
if is_wrapped or (internal_type and (issubclass(internal_type, Enum) or 'name' not in internal_type._xml_map)):
children = data.findall(xml_name, ns)
# If internal type has a local name and it's not a list, I use that name
elif not is_iter_type and internal_type and 'name' in internal_type._xml_map:
xml_name = internal_type._xml_map["name"]
ns = internal_type._xml_map.get("ns", None)
children = data.findall(xml_name, ns)
# That's an array
else:
if internal_type: # Complex type, ignore itemsName and use the complex type name
items_name = internal_type._xml_map["name"]
ns = internal_type._xml_map.get("ns", None)
else:
items_name = xml_desc.get("itemsName", xml_name)
children = data.findall(items_name, ns)
if len(children) == 0:
if is_iter_type:
if is_wrapped:
return None # is_wrapped no node, we want None
else:
return [] # not wrapped, assume empty list
return None # Assume it's not there, maybe an optional node.
# If is_iter_type and not wrapped, return all found children
if is_iter_type:
if not is_wrapped:
return children
else: # Iter and wrapped, should have found one node only (the wrap one)
if len(children) != 1:
raise DeserializationError(
"Tried to deserialize an array not wrapped, and found several nodes '{}'. Maybe you should declare this array as wrapped?".format(
xml_name
))
return list(children[0]) # Might be empty list and that's ok.
# Here it's not a itertype, we should have found one element only or empty
if len(children) > 1:
raise DeserializationError("Find several XML '{}' where it was not expected".format(xml_name))
return children[0]
class Deserializer(object):
"""Response object model deserializer.
:param dict classes: Class type dictionary for deserializing
complex types.
"""
basic_types = {str: 'str', int: 'int', bool: 'bool', float: 'float'}
valid_date = re.compile(
r'\d{4}[-]\d{2}[-]\d{2}T\d{2}:\d{2}:\d{2}'
r'\.?\d*Z?[-+]?[\d{2}]?:?[\d{2}]?')
def __init__(self, classes=None):
self.deserialize_type = {
'iso-8601': Deserializer.deserialize_iso,
'rfc-1123': Deserializer.deserialize_rfc,
'unix-time': Deserializer.deserialize_unix,
'duration': Deserializer.deserialize_duration,
'date': Deserializer.deserialize_date,
'decimal': Deserializer.deserialize_decimal,
'long': Deserializer.deserialize_long,
'bytearray': Deserializer.deserialize_bytearray,
'base64': Deserializer.deserialize_base64,
'object': self.deserialize_object,
'[]': self.deserialize_iter,
'{}': self.deserialize_dict
}
self.deserialize_expected_types = {
'duration': (isodate.Duration, datetime.timedelta),
'iso-8601': (datetime.datetime)
}
self.dependencies = dict(classes) if classes else {}
self.key_extractors = [
rest_key_extractor,
xml_key_extractor
]
# Additional properties only works if the "rest_key_extractor" is used to
# extract the keys. Making it to work whatever the key extractor is too much
# complicated, with no real scenario for now.
# So adding a flag to disable additional properties detection. This flag should be
# used if your expect the deserialization to NOT come from a JSON REST syntax.
# Otherwise, result are unexpected
self.additional_properties_detection = True
def __call__(self, target_obj, response_data, content_type=None):
"""Call the deserializer to process a REST response.
:param str target_obj: Target data type to deserialize to.
:param requests.Response response_data: REST response object.
:param str content_type: Swagger "produces" if available.
:raises: DeserializationError if deserialization fails.
:return: Deserialized object.
"""
data = self._unpack_content(response_data, content_type)
return self._deserialize(target_obj, data)
def _deserialize(self, target_obj, data):
"""Call the deserializer on a model.
Data needs to be already deserialized as JSON or XML ElementTree
:param str target_obj: Target data type to deserialize to.
:param object data: Object to deserialize.
:raises: DeserializationError if deserialization fails.
:return: Deserialized object.
"""
# This is already a model, go recursive just in case
if hasattr(data, "_attribute_map"):
constants = [name for name, config in getattr(data, '_validation', {}).items()
if config.get('constant')]
try:
for attr, mapconfig in data._attribute_map.items():
if attr in constants:
continue
value = getattr(data, attr)
if value is None:
continue
local_type = mapconfig['type']
internal_data_type = local_type.strip('[]{}')
if internal_data_type not in self.dependencies or isinstance(internal_data_type, Enum):
continue
setattr(
data,
attr,
self._deserialize(local_type, value)
)
return data
except AttributeError:
return
response, class_name = self._classify_target(target_obj, data)
if isinstance(response, basestring):
return self.deserialize_data(data, response)
elif isinstance(response, type) and issubclass(response, Enum):
return self.deserialize_enum(data, response)
if data is None:
return data
try:
attributes = response._attribute_map
d_attrs = {}
for attr, attr_desc in attributes.items():
# Check empty string. If it's not empty, someone has a real "additionalProperties"...
if attr == "additional_properties" and attr_desc["key"] == '':
continue
raw_value = None
# Enhance attr_desc with some dynamic data
attr_desc = attr_desc.copy() # Do a copy, do not change the real one
internal_data_type = attr_desc["type"].strip('[]{}')
if internal_data_type in self.dependencies:
attr_desc["internalType"] = self.dependencies[internal_data_type]
for key_extractor in self.key_extractors:
found_value = key_extractor(attr, attr_desc, data)
if found_value is not None:
if raw_value is not None and raw_value != found_value:
raise KeyError('Use twice the key: "{}"'.format(attr))
raw_value = found_value
value = self.deserialize_data(raw_value, attr_desc['type'])
d_attrs[attr] = value
except (AttributeError, TypeError, KeyError) as err:
msg = "Unable to deserialize to object: " + class_name
raise_with_traceback(DeserializationError, msg, err)
else:
additional_properties = self._build_additional_properties(attributes, data)
return self._instantiate_model(response, d_attrs, additional_properties)
def _build_additional_properties(self, attribute_map, data):
if not self.additional_properties_detection:
return None
if "additional_properties" in attribute_map and attribute_map.get("additional_properties", {}).get("key") != '':
# Check empty string. If it's not empty, someone has a real "additionalProperties"
return None
if isinstance(data, ET.Element):
data = {el.tag: el.text for el in data}
known_keys = {_decode_attribute_map_key(_FLATTEN.split(desc['key'])[0])
for desc in attribute_map.values() if desc['key'] != ''}
present_keys = set(data.keys())
missing_keys = present_keys - known_keys
return {key: data[key] for key in missing_keys}
def _classify_target(self, target, data):
"""Check to see whether the deserialization target object can
be classified into a subclass.
Once classification has been determined, initialize object.
:param str target: The target object type to deserialize to.
:param str/dict data: The response data to deseralize.
"""
if target is None:
return None, None
if isinstance(target, basestring):
try:
target = self.dependencies[target]
except KeyError:
return target, target
try:
target = target._classify(data, self.dependencies)
except AttributeError:
pass # Target is not a Model, no classify
return target, target.__class__.__name__
@staticmethod
def _unpack_content(raw_data, content_type=None):
"""Extract the correct structure for deserialization.
If raw_data is a PipelineResponse, try to extract the result of RawDeserializer.
if we can't, raise. Your Pipeline should have a RawDeserializer.
If not a pipeline response and raw_data is bytes or string, use content-type
to decode it. If no content-type, try JSON.
If raw_data is something else, bypass all logic and return it directly.
:param raw_data: Data to be processed.
:param content_type: How to parse if raw_data is a string/bytes.
:raises JSONDecodeError: If JSON is requested and parsing is impossible.
:raises UnicodeDecodeError: If bytes is not UTF8
"""
# This avoids a circular dependency. We might want to consider RawDesializer is more generic
# than the pipeline concept, and put it in a toolbox, used both here and in pipeline. TBD.
from .pipeline.universal import RawDeserializer
# Assume this is enough to detect a Pipeline Response without importing it
context = getattr(raw_data, "context", {})
if context:
if RawDeserializer.CONTEXT_NAME in context:
return context[RawDeserializer.CONTEXT_NAME]
raise ValueError("This pipeline didn't have the RawDeserializer policy; can't deserialize")
#Assume this is enough to recognize universal_http.ClientResponse without importing it
if hasattr(raw_data, "body"):
return RawDeserializer.deserialize_from_http_generics(
raw_data.text(),
raw_data.headers
)
# Assume this enough to recognize requests.Response without importing it.
if hasattr(raw_data, '_content_consumed'):
return RawDeserializer.deserialize_from_http_generics(
raw_data.text,
raw_data.headers
)
if isinstance(raw_data, (basestring, bytes)) or hasattr(raw_data, 'read'):
return RawDeserializer.deserialize_from_text(raw_data, content_type)
return raw_data
def _instantiate_model(self, response, attrs, additional_properties=None):
"""Instantiate a response model passing in deserialized args.
:param response: The response model class.
:param d_attrs: The deserialized response attributes.
"""
if callable(response):
subtype = getattr(response, '_subtype_map', {})
try:
readonly = [k for k, v in response._validation.items()
if v.get('readonly')]
const = [k for k, v in response._validation.items()
if v.get('constant')]
kwargs = {k: v for k, v in attrs.items()
if k not in subtype and k not in readonly + const}
response_obj = response(**kwargs)
for attr in readonly:
setattr(response_obj, attr, attrs.get(attr))
if additional_properties:
response_obj.additional_properties = additional_properties
return response_obj
except TypeError as err:
msg = "Unable to deserialize {} into model {}. ".format(
kwargs, response)
raise DeserializationError(msg + str(err))
else:
try:
for attr, value in attrs.items():
setattr(response, attr, value)
return response
except Exception as exp:
msg = "Unable to populate response model. "
msg += "Type: {}, Error: {}".format(type(response), exp)
raise DeserializationError(msg)
def deserialize_data(self, data, data_type):
"""Process data for deserialization according to data type.
:param str data: The response string to be deserialized.
:param str data_type: The type to deserialize to.
:raises: DeserializationError if deserialization fails.
:return: Deserialized object.
"""
if data is None:
return data
try:
if not data_type:
return data
if data_type in self.basic_types.values():
return self.deserialize_basic(data, data_type)
if data_type in self.deserialize_type:
if isinstance(data, self.deserialize_expected_types.get(data_type, tuple())):
return data
is_a_text_parsing_type = lambda x: x not in ["object", "[]", r"{}"]
if isinstance(data, ET.Element) and is_a_text_parsing_type(data_type) and not data.text:
return None
data_val = self.deserialize_type[data_type](data)
return data_val
iter_type = data_type[0] + data_type[-1]
if iter_type in self.deserialize_type:
return self.deserialize_type[iter_type](data, data_type[1:-1])
obj_type = self.dependencies[data_type]
if issubclass(obj_type, Enum):
if isinstance(data, ET.Element):
data = data.text
return self.deserialize_enum(data, obj_type)
except (ValueError, TypeError, AttributeError) as err:
msg = "Unable to deserialize response data."
msg += " Data: {}, {}".format(data, data_type)
raise_with_traceback(DeserializationError, msg, err)
else:
return self._deserialize(obj_type, data)
def deserialize_iter(self, attr, iter_type):
"""Deserialize an iterable.
:param list attr: Iterable to be deserialized.
:param str iter_type: The type of object in the iterable.
:rtype: list
"""
if attr is None:
return None
if isinstance(attr, ET.Element): # If I receive an element here, get the children
attr = list(attr)
if not isinstance(attr, (list, set)):
raise DeserializationError("Cannot deserialize as [{}] an object of type {}".format(
iter_type,
type(attr)
))
return [self.deserialize_data(a, iter_type) for a in attr]
def deserialize_dict(self, attr, dict_type):
"""Deserialize a dictionary.
:param dict/list attr: Dictionary to be deserialized. Also accepts
a list of key, value pairs.
:param str dict_type: The object type of the items in the dictionary.
:rtype: dict
"""
if isinstance(attr, list):
return {x['key']: self.deserialize_data(x['value'], dict_type) for x in attr}
if isinstance(attr, ET.Element):
# Transform <Key>value</Key> into {"Key": "value"}
attr = {el.tag: el.text for el in attr}
return {k: self.deserialize_data(v, dict_type) for k, v in attr.items()}
def deserialize_object(self, attr, **kwargs):
"""Deserialize a generic object.
This will be handled as a dictionary.
:param dict attr: Dictionary to be deserialized.
:rtype: dict
:raises: TypeError if non-builtin datatype encountered.
"""
if attr is None:
return None
if isinstance(attr, ET.Element):
# Do no recurse on XML, just return the tree as-is
return attr
if isinstance(attr, basestring):
return self.deserialize_basic(attr, 'str')
obj_type = type(attr)
if obj_type in self.basic_types:
return self.deserialize_basic(attr, self.basic_types[obj_type])
if obj_type is _long_type:
return self.deserialize_long(attr)
if obj_type == dict:
deserialized = {}
for key, value in attr.items():
try:
deserialized[key] = self.deserialize_object(
value, **kwargs)
except ValueError:
deserialized[key] = None
return deserialized
if obj_type == list:
deserialized = []
for obj in attr:
try:
deserialized.append(self.deserialize_object(
obj, **kwargs))
except ValueError:
pass
return deserialized
else:
error = "Cannot deserialize generic object with type: "
raise TypeError(error + str(obj_type))
def deserialize_basic(self, attr, data_type):
"""Deserialize baisc builtin data type from string.
Will attempt to convert to str, int, float and bool.
This function will also accept '1', '0', 'true' and 'false' as
valid bool values.
:param str attr: response string to be deserialized.
:param str data_type: deserialization data type.
:rtype: str, int, float or bool
:raises: TypeError if string format is not valid.
"""
# If we're here, data is supposed to be a basic type.
# If it's still an XML node, take the text
if isinstance(attr, ET.Element):
attr = attr.text
if not attr:
if data_type == "str":
# None or '', node <a/> is empty string.
return ''
else:
# None or '', node <a/> with a strong type is None.
# Don't try to model "empty bool" or "empty int"
return None
if data_type == 'bool':
if attr in [True, False, 1, 0]:
return bool(attr)
elif isinstance(attr, basestring):
if attr.lower() in ['true', '1']:
return True
elif attr.lower() in ['false', '0']:
return False
raise TypeError("Invalid boolean value: {}".format(attr))
if data_type == 'str':
return self.deserialize_unicode(attr)
return eval(data_type)(attr)
@staticmethod
def deserialize_unicode(data):
"""Preserve unicode objects in Python 2, otherwise return data
as a string.
:param str data: response string to be deserialized.
:rtype: str or unicode
"""
# We might be here because we have an enum modeled as string,
# and we try to deserialize a partial dict with enum inside
if isinstance(data, Enum):
return data
# Consider this is real string
try:
if isinstance(data, unicode):
return data
except NameError:
return str(data)
else:
return str(data)
@staticmethod
def deserialize_enum(data, enum_obj):
"""Deserialize string into enum object.
If the string is not a valid enum value it will be returned as-is
and a warning will be logged.
:param str data: Response string to be deserialized. If this value is
None or invalid it will be returned as-is.
:param Enum enum_obj: Enum object to deserialize to.
:rtype: Enum
"""
if isinstance(data, enum_obj) or data is None:
return data
if isinstance(data, Enum):
data = data.value
if isinstance(data, int):
# Workaround. We might consider remove it in the future.
# https://github.com/Azure/azure-rest-api-specs/issues/141
try:
return list(enum_obj.__members__.values())[data]
except IndexError:
error = "{!r} is not a valid index for enum {!r}"
raise DeserializationError(error.format(data, enum_obj))
try:
return enum_obj(str(data))
except ValueError:
for enum_value in enum_obj:
if enum_value.value.lower() == str(data).lower():
return enum_value
# We don't fail anymore for unknown value, we deserialize as a string
_LOGGER.warning("Deserializer is not able to find %s as valid enum in %s", data, enum_obj)
return Deserializer.deserialize_unicode(data)
@staticmethod
def deserialize_bytearray(attr):
"""Deserialize string into bytearray.
:param str attr: response string to be deserialized.
:rtype: bytearray
:raises: TypeError if string format invalid.
"""
if isinstance(attr, ET.Element):
attr = attr.text
return bytearray(b64decode(attr))
@staticmethod
def deserialize_base64(attr):
"""Deserialize base64 encoded string into string.
:param str attr: response string to be deserialized.
:rtype: bytearray
:raises: TypeError if string format invalid.
"""
if isinstance(attr, ET.Element):
attr = attr.text
padding = '=' * (3 - (len(attr) + 3) % 4)
attr = attr + padding
encoded = attr.replace('-', '+').replace('_', '/')
return b64decode(encoded)
@staticmethod
def deserialize_decimal(attr):
"""Deserialize string into Decimal object.
:param str attr: response string to be deserialized.
:rtype: Decimal
:raises: DeserializationError if string format invalid.
"""
if isinstance(attr, ET.Element):
attr = attr.text
try:
return decimal.Decimal(attr)
except decimal.DecimalException as err:
msg = "Invalid decimal {}".format(attr)
raise_with_traceback(DeserializationError, msg, err)
@staticmethod
def deserialize_long(attr):
"""Deserialize string into long (Py2) or int (Py3).
:param str attr: response string to be deserialized.
:rtype: long or int
:raises: ValueError if string format invalid.
"""
if isinstance(attr, ET.Element):
attr = attr.text
return _long_type(attr)
@staticmethod
def deserialize_duration(attr):
"""Deserialize ISO-8601 formatted string into TimeDelta object.
:param str attr: response string to be deserialized.
:rtype: TimeDelta
:raises: DeserializationError if string format invalid.
"""
if isinstance(attr, ET.Element):
attr = attr.text
try:
duration = isodate.parse_duration(attr)
except(ValueError, OverflowError, AttributeError) as err:
msg = "Cannot deserialize duration object."
raise_with_traceback(DeserializationError, msg, err)
else:
return duration
@staticmethod
def deserialize_date(attr):
"""Deserialize ISO-8601 formatted string into Date object.
:param str attr: response string to be deserialized.
:rtype: Date
:raises: DeserializationError if string format invalid.
"""
if isinstance(attr, ET.Element):
attr = attr.text
if re.search(r"[^\W\d_]", attr, re.I + re.U):
raise DeserializationError("Date must have only digits and -. Received: %s" % attr)
# This must NOT use defaultmonth/defaultday. Using None ensure this raises an exception.
return isodate.parse_date(attr, defaultmonth=None, defaultday=None)
@staticmethod
def deserialize_rfc(attr):
"""Deserialize RFC-1123 formatted string into Datetime object.
:param str attr: response string to be deserialized.
:rtype: Datetime
:raises: DeserializationError if string format invalid.
"""
if isinstance(attr, ET.Element):
attr = attr.text
try:
date_obj = datetime.datetime.strptime(
attr, "%a, %d %b %Y %H:%M:%S %Z")
if not date_obj.tzinfo:
date_obj = date_obj.replace(tzinfo=TZ_UTC)
except ValueError as err:
msg = "Cannot deserialize to rfc datetime object."
raise_with_traceback(DeserializationError, msg, err)
else:
return date_obj
@staticmethod
def deserialize_iso(attr):
"""Deserialize ISO-8601 formatted string into Datetime object.
:param str attr: response string to be deserialized.
:rtype: Datetime
:raises: DeserializationError if string format invalid.
"""
if isinstance(attr, ET.Element):
attr = attr.text
try:
attr = attr.upper()
match = Deserializer.valid_date.match(attr)
if not match:
raise ValueError("Invalid datetime string: " + attr)
check_decimal = attr.split('.')
if len(check_decimal) > 1:
decimal_str = ""
for digit in check_decimal[1]:
if digit.isdigit():
decimal_str += digit
else:
break
if len(decimal_str) > 6:
attr = attr.replace(decimal_str, decimal_str[0:6])
date_obj = isodate.parse_datetime(attr)
test_utc = date_obj.utctimetuple()
if test_utc.tm_year > 9999 or test_utc.tm_year < 1:
raise OverflowError("Hit max or min date")
except(ValueError, OverflowError, AttributeError) as err:
msg = "Cannot deserialize datetime object."
raise_with_traceback(DeserializationError, msg, err)
else:
return date_obj
@staticmethod
def deserialize_unix(attr):
"""Serialize Datetime object into IntTime format.
This is represented as seconds.
:param int attr: Object to be serialized.
:rtype: Datetime
:raises: DeserializationError if format invalid
"""
if isinstance(attr, ET.Element):
attr = int(attr.text)
try:
date_obj = datetime.datetime.fromtimestamp(attr, TZ_UTC)
except ValueError as err:
msg = "Cannot deserialize to unix datetime object."
raise_with_traceback(DeserializationError, msg, err)
else:
return date_obj