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from __future__ import unicode_literals

import copy

import jsonschema

import jsonschema.validators

# From https://github.com/Julian/jsonschema/blob/master/docs/faq.rst

def extend_validator_cls(validator_cls, modify):

validate_properties = validator_cls.VALIDATORS['properties']

def new_properties(validator, properties, instance, schema):

# Exhaust the validator

list(validate_properties(validator, properties, instance, schema))

modify(properties, instance)

return jsonschema.validators.extend(

validator_cls, {'properties': new_properties},

)

def default_values(properties, instance):

for prop, subschema in properties.items():

if 'default' in subschema:

instance.setdefault(

prop, copy.deepcopy(subschema['default']),

)

def remove_default_values(properties, instance):

for prop, subschema in properties.items():

if (

'default' in subschema and

instance.get(prop) == subschema['default']

del instance[prop]

_AddDefaultsValidator = extend_validator_cls(

jsonschema.Draft4Validator, default_values,

)

_RemoveDefaultsValidator = extend_validator_cls(

jsonschema.Draft4Validator, remove_default_values,

)

def apply_defaults(obj, schema):

obj = copy.deepcopy(obj)

_AddDefaultsValidator(schema).validate(obj)

return obj

def remove_defaults(obj, schema):

obj = copy.deepcopy(obj)

_RemoveDefaultsValidator(schema).validate(obj)

return obj

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