PK\rN\_sOOdrf_lighten/__init__.py"""A way to remove unwanted fields from a serializer""" __version__ = "0.7.1" PK5rNgO\drf_lighten/parsers.pyimport json import re def re_parser(string): step_0 = string.replace(' ', '').replace('{', '[').replace('}', ']') step_1 = re.sub(r'(\w+)\{', r'{"\1": [', step_0) step_2 = re.sub(r'(\w+)\[', r'{"\1": [', step_1) step_3 = re.sub(r'](?=.)', r']}', step_2) step_4 = re.sub(r'(?<=\[|,)(\*|\w+)(?=,|])', r'"\1"', step_3) return json.loads(step_4) def recursive_parser(string): pass def split(parsed): strings = [] dictionary = {} for field_entry in parsed: if isinstance(field_entry, dict): dictionary.update(field_entry) else: strings.append(field_entry) return strings, dictionary def preprocess(parsed): strings, dictionary = split(parsed) if dictionary: return strings + [dictionary] return strings def validate_star(parsed): strings, dictionary = split(parsed) for inner_entry in dictionary.values(): validate_star(inner_entry) if '*' in strings and len(strings) != 1: raise ValueError def parse(string): try: parsed = json.loads(string) except (ValueError, TypeError): parsed = re_parser(string) parsed = preprocess(parsed) validate_star(parsed) return parsed PKZrNb'yydrf_lighten/serializers.pyimport operator from django.conf import settings from rest_framework import relations, serializers from .parsers import split try: string_type = basestring except NameError: string_type = str class DynamicFieldsMixin(object): def __init__(self, *args, **kwargs): fields = kwargs.pop("fields", None) exclude = kwargs.pop("exclude", None) super(DynamicFieldsMixin, self).__init__(*args, **kwargs) if fields is not None: self.lighten(fields, "fields") elif exclude is not None: self.lighten(exclude, "exclude") def lighten(self, entries, argument): if argument == "fields": field_selector = operator.sub else: field_selector = operator.and_ field_strings, field_dictionary = self.split_fields(entries) for field_name, field_entry in field_dictionary.items(): if field_name in self.fields: self.pass_down_structure(field_name, field_entry, argument) subset = set(field_strings) never_pop = set(field_dictionary.keys()) existing = set(self.fields.keys()) for field_name in field_selector(existing, subset) - never_pop: self.fields.pop(field_name, None) def split_fields(self, fields): strings, dictionary = split(fields) if strings == ['*']: strings = set(self.fields.keys()) - set(dictionary.keys()) return strings, dictionary def get_kwargs(self, field): field_name = field.field_name inherit = set(relations.MANY_RELATION_KWARGS).union( set(serializers.LIST_SERIALIZER_KWARGS) ).difference({'html_cutoff_text', 'html_cutoff'}) kwargs = {} for attribute_name in inherit: try: kwargs[attribute_name] = getattr(field, attribute_name) except AttributeError: pass if kwargs["source"] in ["", field_name]: kwargs.pop("source") kwargs["context"] = kwargs.get("context") or self.context return kwargs def get_field_and_kwargs(self, field_name): field = self.fields[field_name] many = True if isinstance(field, serializers.ListSerializer): field = field.child elif isinstance(field, serializers.ManyRelatedField): field.child_relation.source = field.source field.child_relation.source_attrs = field.source_attrs field.child_relation.field_name = field.field_name field = field.child_relation else: many = False kwargs = self.get_kwargs(field) kwargs["many"] = many return field, kwargs def get_expanding_serializer(self, field, **kwargs): field_name = field.field_name expansion_dict_attribute = getattr(settings, 'DRF_LIGHTEN_EXPANION_CONFIG', 'expandable_fields') expansion_dict = getattr(self.Meta, expansion_dict_attribute, {}) try: class_, exp_args, exp_kwargs = expansion_dict[field_name] except (ValueError, TypeError): class_, exp_args, exp_kwargs = expansion_dict[field_name], (), {} except KeyError: return field exp_kwargs.update(kwargs) return class_(*exp_args, **exp_kwargs) def pass_down_structure(self, field_name, field_entry, arg_name): field, kwargs = self.get_field_and_kwargs(field_name) kwargs[arg_name] = field_entry if not hasattr(field, "fields"): new_field = self.get_expanding_serializer(field, **kwargs) else: try: return field.lighten(field_entry, arg_name) except AttributeError: return if getattr(new_field, "source"): return self.fields[field_name] = new_field PKՈNwADbbdrf_lighten/views.pyfrom django.conf import settings from .parsers import parse class DynamicFieldsMixin(object): def get_serializer(self, *args, **kwargs): setting_names = ('DRF_LIGHTEN_INCLUDE', 'DRF_LIGHTEN_EXCLUDE') defaults = ('fields', 'exclude') argument_names = ('fields', 'exclude') self.request.query_params._mutable = True bundle = zip(setting_names, defaults, argument_names) for setting_name, default, argument_name in bundle: try: query_param = getattr(settings, setting_name, default) structure = self.request.query_params.pop(query_param).pop() kwargs[argument_name] = parse(structure) except (KeyError, ValueError, TypeError, IndexError): pass return super(DynamicFieldsMixin, self).get_serializer(*args, **kwargs) PKR@N_99#drf_lighten-0.7.1.dist-info/LICENSEThe MIT License (MIT) Copyright (c) 2019 Henock Tesfaye 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 rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 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