Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/galaxy/util/json.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 from __future__ import absolute_import
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2
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3 import collections
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4 import copy
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5 import json
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6 import logging
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7 import math
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8 import random
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9 import string
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10
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11 from six import iteritems, string_types
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12
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13 from ..util import unicodify
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14
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15 __all__ = ("safe_dumps", "validate_jsonrpc_request", "validate_jsonrpc_response", "jsonrpc_request", "jsonrpc_response")
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16
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17 log = logging.getLogger(__name__)
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18
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19 to_json_string = json.dumps
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20 from_json_string = json.loads
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21
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22
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23 def swap_inf_nan(val):
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24 """
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25 This takes an arbitrary object and preps it for jsonifying safely, templating Inf/NaN.
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26 """
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27 if isinstance(val, string_types):
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28 # basestring first, because it's a sequence and would otherwise get caught below.
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29 return val
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30 elif isinstance(val, collections.Sequence):
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31 return [swap_inf_nan(v) for v in val]
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32 elif isinstance(val, collections.Mapping):
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33 return dict([(swap_inf_nan(k), swap_inf_nan(v)) for (k, v) in iteritems(val)])
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34 elif isinstance(val, float):
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35 if math.isnan(val):
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36 return "__NaN__"
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37 elif val == float("inf"):
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38 return "__Infinity__"
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39 elif val == float("-inf"):
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40 return "__-Infinity__"
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41 else:
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42 return val
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43 else:
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44 return val
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45
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46
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47 def safe_loads(arg):
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48 """
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49 This is a wrapper around loads that returns the parsed value instead of
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50 raising a value error. It also avoids autoconversion of non-iterables
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51 i.e numeric and boolean values.
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52 """
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53 try:
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54 loaded = json.loads(arg)
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55 if loaded is not None and not isinstance(loaded, collections.Iterable):
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56 loaded = arg
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57 except (TypeError, ValueError):
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58 loaded = arg
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59 return loaded
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60
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61
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62 def safe_dumps(*args, **kwargs):
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63 """
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64 This is a wrapper around dumps that encodes Infinity and NaN values. It's a
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65 fairly rare case (which will be low in request volume). Basically, we tell
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66 json.dumps to blow up if it encounters Infinity/NaN, and we 'fix' it before
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67 re-encoding.
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68 """
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69 try:
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70 dumped = json.dumps(*args, allow_nan=False, **kwargs)
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71 except ValueError:
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72 obj = swap_inf_nan(copy.deepcopy(args[0]))
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73 dumped = json.dumps(obj, allow_nan=False, **kwargs)
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74 if kwargs.get('escape_closing_tags', True):
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75 return dumped.replace('</', '<\\/')
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76 return dumped
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77
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78
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79 def safe_dumps_formatted(obj):
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80 """Attempt to format an object for display.
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81
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82 If serialization fails, the object's string representation will be returned instead.
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83 """
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84 try:
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85 return safe_dumps(obj, sort_keys=True, indent=4, separators=(',', ': '))
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86 except TypeError:
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87 log.warning("JSON serialization failed for object: %s", str(obj))
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88 return str(obj)
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89
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90
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91 # Methods for handling JSON-RPC
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92
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93 def validate_jsonrpc_request(request, regular_methods, notification_methods):
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94 try:
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95 request = json.loads(request)
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96 except Exception as e:
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97 return False, request, jsonrpc_response(id=None,
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98 error=dict(code=-32700,
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99 message='Parse error',
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100 data=unicodify(e)))
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101 try:
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102 assert 'jsonrpc' in request, \
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103 'This server requires JSON-RPC 2.0 and no "jsonrpc" member was sent with the Request object as per the JSON-RPC 2.0 Specification.'
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104 assert request['jsonrpc'] == '2.0', \
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105 'Requested JSON-RPC version "%s" != required version "2.0".' % request['jsonrpc']
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106 assert 'method' in request, 'No "method" member was sent with the Request object'
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107 except AssertionError as e:
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108 return False, request, jsonrpc_response(request=request,
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109 error=dict(code=-32600,
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110 message='Invalid Request',
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111 data=unicodify(e)))
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112 try:
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113 assert request['method'] in (regular_methods + notification_methods)
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114 except AssertionError:
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115 return False, request, jsonrpc_response(request=request,
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116 error=dict(code=-32601,
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117 message='Method not found',
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118 data='Valid methods are: %s' % ', '.join(regular_methods + notification_methods)))
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119 try:
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120 if request['method'] in regular_methods:
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121 assert 'id' in request, 'No "id" member was sent with the Request object and the requested method "%s" is not a notification method' % request['method']
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122 except AssertionError as e:
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123 return False, request, jsonrpc_response(request=request,
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124 error=dict(code=-32600,
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125 message='Invalid Request',
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126 data=unicodify(e)))
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127 return True, request, None
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128
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129
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130 def validate_jsonrpc_response(response, id=None):
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131 try:
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132 response = json.loads(response)
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133 except Exception as e:
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134 log.error('Response was not valid JSON: %s', unicodify(e))
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135 log.debug('Response was: %s', response)
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136 return False, response
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137 try:
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138 assert 'jsonrpc' in response, \
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139 'This server requires JSON-RPC 2.0 and no "jsonrpc" member was sent with the Response object as per the JSON-RPC 2.0 Specification.'
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140 assert ('result' in response or 'error' in response), \
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141 'Neither of "result" or "error" members were sent with the Response object.'
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142 if 'error' in response:
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143 assert int(response['error']['code']), \
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144 'The "code" member of the "error" object in the Response is missing or not an integer.'
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145 assert 'message' in response, \
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146 'The "message" member of the "error" object in the Response is missing.'
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147 except Exception:
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148 log.exception('Response was not valid JSON-RPC')
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149 log.debug('Response was: %s' % response)
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150 return False, response
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151 if id is not None:
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152 try:
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153 assert 'id' in response and response['id'] == id
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154 except Exception:
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155 log.error('The response id "%s" does not match the request id "%s"' % (response['id'], id))
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156 return False, response
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157 return True, response
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158
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159
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160 def jsonrpc_request(method, params=None, id=None, jsonrpc='2.0'):
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161 if method is None:
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162 log.error('jsonrpc_request(): "method" parameter cannot be None')
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163 return None
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164 request = dict(jsonrpc=jsonrpc, method=method)
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165 if params:
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166 request['params'] = params
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167 if id is not None and id is True:
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168 request['id'] = ''.join(random.choice(string.hexdigits) for i in range(16))
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169 elif id is not None:
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170 request['id'] = id
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171 return request
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172
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173
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174 def jsonrpc_response(request=None, id=None, result=None, error=None, jsonrpc='2.0'):
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175 if result:
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176 rval = dict(jsonrpc=jsonrpc, result=result)
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177 elif error:
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178 rval = dict(jsonrpc=jsonrpc, error=error)
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179 else:
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180 msg = 'jsonrpc_response() called with out a "result" or "error" parameter'
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181 log.error(msg)
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182 rval = dict(jsonrpc=jsonrpc, error=msg)
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183 if id is not None:
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184 rval['id'] = id
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185 elif request is not None and 'id' in request:
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186 rval['id'] = request['id']
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187 return rval