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68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
# Python
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from collections import OrderedDict
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import json
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import yaml
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# Django
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from django.conf import settings
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from django.utils import six
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from django.utils.translation import ugettext_lazy as _
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# Django REST Framework
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from rest_framework import parsers
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from rest_framework.exceptions import ParseError
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class OrderedDictLoader(yaml.SafeLoader):
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"""
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This yaml loader is used to deal with current pyYAML (3.12) not supporting
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custom object pairs hook. Remove it when new version adds that support.
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"""
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def construct_mapping(self, node, deep=False):
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if isinstance(node, yaml.nodes.MappingNode):
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self.flatten_mapping(node)
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else:
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raise yaml.constructor.ConstructorError(
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None, None,
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"expected a mapping node, but found %s" % node.id,
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node.start_mark
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)
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mapping = OrderedDict()
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for key_node, value_node in node.value:
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key = self.construct_object(key_node, deep=deep)
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try:
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hash(key)
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except TypeError, exc:
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raise yaml.constructor.ConstructorError(
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"while constructing a mapping", node.start_mark,
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"found unacceptable key (%s)" % exc, key_node.start_mark
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)
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value = self.construct_object(value_node, deep=deep)
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mapping[key] = value
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return mapping
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class JSONParser(parsers.JSONParser):
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"""
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Parses JSON-serialized data, preserving order of dictionary keys.
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"""
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def parse(self, stream, media_type=None, parser_context=None):
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"""
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Parses the incoming bytestream as JSON and returns the resulting data.
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"""
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parser_context = parser_context or {}
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encoding = parser_context.get('encoding', settings.DEFAULT_CHARSET)
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try:
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data = stream.read().decode(encoding)
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if not data:
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return {}
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obj = json.loads(data, object_pairs_hook=OrderedDict)
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if not isinstance(obj, dict) and obj is not None:
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raise ParseError(_('JSON parse error - not a JSON object'))
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return obj
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except ValueError as exc:
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raise ParseError(_('JSON parse error - %s\nPossible cause: trailing comma.' % six.text_type(exc)))
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