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1
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# Python
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2
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3
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from collections import OrderedDict
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3
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3
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import json
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4
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3
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import yaml
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5
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6
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# Django
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7
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3
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from django.conf import settings
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8
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3
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from django.utils import six
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9
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3
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from django.utils.translation import ugettext_lazy as _
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10
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11
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# Django REST Framework
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12
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3
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from rest_framework import parsers
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13
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3
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from rest_framework.exceptions import ParseError
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14
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15
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16
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3
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class OrderedDictLoader(yaml.SafeLoader):
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17
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"""
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18
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This yaml loader is used to deal with current pyYAML (3.12) not supporting
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19
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custom object pairs hook. Remove it when new version adds that support.
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20
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"""
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21
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22
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3
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def construct_mapping(self, node, deep=False):
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23
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0
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if isinstance(node, yaml.nodes.MappingNode):
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24
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0
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self.flatten_mapping(node)
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25
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else:
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26
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0
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raise yaml.constructor.ConstructorError(
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27
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None, None,
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28
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"expected a mapping node, but found %s" % node.id,
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29
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node.start_mark
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30
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)
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31
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0
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mapping = OrderedDict()
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32
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0
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for key_node, value_node in node.value:
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33
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0
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key = self.construct_object(key_node, deep=deep)
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34
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0
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try:
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35
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0
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hash(key)
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36
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0
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except TypeError as exc:
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37
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0
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raise yaml.constructor.ConstructorError(
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38
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"while constructing a mapping", node.start_mark,
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39
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"found unacceptable key (%s)" % exc, key_node.start_mark
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40
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)
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41
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0
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value = self.construct_object(value_node, deep=deep)
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42
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0
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mapping[key] = value
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43
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0
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return mapping
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44
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45
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46
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3
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class JSONParser(parsers.JSONParser):
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47
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"""
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48
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Parses JSON-serialized data, preserving order of dictionary keys.
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49
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"""
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50
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51
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3
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def parse(self, stream, media_type=None, parser_context=None):
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52
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"""
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53
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Parses the incoming bytestream as JSON and returns the resulting data.
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54
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"""
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55
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3
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parser_context = parser_context or {}
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56
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3
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encoding = parser_context.get('encoding', settings.DEFAULT_CHARSET)
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57
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3
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try:
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58
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3
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data = stream.read().decode(encoding)
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59
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3
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if not data:
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60
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0
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return {}
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61
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3
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obj = json.loads(data, object_pairs_hook=OrderedDict)
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62
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3
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if not isinstance(obj, dict) and not isinstance(obj, list) and obj is not None:
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63
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0
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raise ParseError(_('JSON parse error - not a JSON object'))
|
|
64
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3
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return obj
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|
65
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0
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except ValueError as exc:
|
|
66
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0
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raise ParseError(_('JSON parse error - %s\nPossible cause: trailing comma.' % six.text_type(exc)))
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Pelt10