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annotate ZTUtils/Zope.py @ 1042:adcfdeac4e76

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author Richard Jones <richard@users.sourceforge.net>
date Wed, 04 Sep 2002 04:47:28 +0000
parents 7fe79c67aaa9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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983
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1 ##############################################################################
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2 #
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3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
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4 #
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5 # This software is subject to the provisions of the Zope Public License,
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6 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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10 # FOR A PARTICULAR PURPOSE
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11 #
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12 ##############################################################################
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13 __doc__='''Zope-specific versions of ZTUTils classes
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14
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15 $Id: Zope.py,v 1.1 2002-08-30 08:25:34 richard Exp $'''
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16 __version__='$Revision: 1.1 $'[11:-2]
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17
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18 import sys, cgi, urllib, cgi
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19 from Tree import encodeExpansion, decodeExpansion, TreeMaker
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20 from SimpleTree import SimpleTreeMaker
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21 from Batch import Batch
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22 from Products.ZCatalog.Lazy import Lazy
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23 from AccessControl import getSecurityManager
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24 from string import split, join
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25 from types import StringType, ListType, IntType, FloatType
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26 from DateTime import DateTime
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27
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28 try:
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29 from AccessControl.ZopeGuards import guarded_getitem
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30 except ImportError:
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31 Unauthorized = 'Unauthorized'
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32 def guarded_getitem(object, index):
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33 v = object[index]
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34 if getSecurityManager().validate(object, object, index, v):
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35 return v
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36 raise Unauthorized, 'unauthorized access to element %s' % `i`
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37 else:
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38 from AccessControl import Unauthorized
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39
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40 class LazyFilter(Lazy):
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41 # A LazyFilter that checks with the security policy
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42
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43 def __init__(self, seq, test=None, skip=None):
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44 self._seq=seq
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45 self._data=[]
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46 self._eindex=-1
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47 self._test=test
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48 if not (skip is None or str(skip) == skip):
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49 raise TypeError, 'Skip must be None or a string'
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50 self._skip = skip
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51
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52 def __getitem__(self,index):
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53 data=self._data
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54 try: s=self._seq
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55 except AttributeError: return data[index]
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56
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57 i=index
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58 if i < 0: i=len(self)+i
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59 if i < 0: raise IndexError, index
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60
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61 ind=len(data)
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62 if i < ind: return data[i]
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63 ind=ind-1
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64
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65 test=self._test
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66 e=self._eindex
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67 skip = self._skip
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68 while i > ind:
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69 e = e + 1
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70 try:
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71 try: v = guarded_getitem(s, e)
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72 except Unauthorized, vv:
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73 if skip is None:
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74 self._eindex = e
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75 msg = '(item %s): %s' % (index, vv)
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76 raise Unauthorized, msg, sys.exc_info()[2]
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77 skip_this = 1
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78 else:
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79 skip_this = 0
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80 except IndexError:
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81 del self._test
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82 del self._seq
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83 del self._eindex
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84 raise IndexError, index
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85 if skip_this: continue
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86 if skip and not getSecurityManager().checkPermission(skip, v):
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87 continue
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88 if test is None or test(v):
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89 data.append(v)
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90 ind=ind+1
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91 self._eindex=e
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92 return data[i]
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93
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94 class TreeSkipMixin:
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95 '''Mixin class to make trees test security, and allow
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96 skipping of unauthorized objects. '''
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97 skip = None
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98 def setSkip(self, skip):
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99 self.skip = skip
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100 return self
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101 def getChildren(self, object):
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102 return LazyFilter(self._getChildren(object), skip=self.skip)
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103
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104 class TreeMaker(TreeSkipMixin, TreeMaker):
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105 _getChildren = TreeMaker.getChildren
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106
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107 class SimpleTreeMaker(TreeSkipMixin, SimpleTreeMaker):
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108 _getChildren = SimpleTreeMaker.getChildren
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109 def cookieTree(self, root_object, default_state=None):
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110 '''Make a tree with state stored in a cookie.'''
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111 tree_pre = self.tree_pre
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112 state_name = '%s-state' % tree_pre
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113 set_name = '%s-setstate' % tree_pre
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114
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115 req = root_object.REQUEST
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116 state = req.get(state_name)
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117 if state:
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118 setst = req.form.get(set_name)
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119 if setst:
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120 st, pn, expid = split(setst, ',')
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121 state, (m, obid) = decodeExpansion(state, int(pn))
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122 if m is None:
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123 pass
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124 elif st == 'e':
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125 if m[obid] is None:
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126 m[obid] = {expid: None}
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127 else:
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128 m[obid][expid] = None
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129 elif st == 'c' and m is not state and obid==expid:
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130 del m[obid]
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131 else:
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132 state = decodeExpansion(state)
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133 else:
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134 state = default_state
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135 tree = self.tree(root_object, state)
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136 rows = tree.flat()
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137 req.RESPONSE.setCookie(state_name, encodeExpansion(rows))
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138 return tree, rows
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139
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140 # Make the Batch class test security, and let it skip unauthorized.
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141 _Batch = Batch
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142 class Batch(Batch):
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143 def __init__(self, sequence, size, start=0, end=0,
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144 orphan=0, overlap=0, skip_unauthorized=None):
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145 sequence = LazyFilter(sequence, skip=skip_unauthorized)
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146 _Batch.__init__(self, sequence, size, start, end,
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147 orphan, overlap)
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148
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149 # These functions are meant to be used together in templates that use
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150 # trees or batches. For example, given a batch with a 'bstart' query
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151 # argument, you would use "url_query(request, omit='bstart')" to get
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152 # the base for the batching links, then append
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153 # "make_query(bstart=batch.previous.first)" to one and
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154 # "make_query(bstart=batch.end)" to the other.
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155
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156 def make_query(*args, **kwargs):
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157 '''Construct a URL query string, with marshalling markup.
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158
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159 If there are positional arguments, they must be dictionaries.
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160 They are combined with the dictionary of keyword arguments to form
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161 a dictionary of query names and values.
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162
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163 Query names (the keys) must be strings. Values may be strings,
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164 integers, floats, or DateTimes, and they may also be lists or
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165 namespaces containing these types. Names and string values
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166 should not be URL-quoted. All arguments are marshalled with
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167 complex_marshal().
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168 '''
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169
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170 d = {}
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171 for arg in args:
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172 d.update(arg)
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173 d.update(kwargs)
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174
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175 uq = urllib.quote
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176 qlist = complex_marshal(d.items())
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177 for i in range(len(qlist)):
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178 k, m, v = qlist[i]
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179 qlist[i] = '%s%s=%s' % (uq(k), m, uq(str(v)))
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180
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181 return join(qlist, '&')
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182
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183 def make_hidden_input(*args, **kwargs):
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184 '''Construct a set of hidden input elements, with marshalling markup.
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185
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186 If there are positional arguments, they must be dictionaries.
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187 They are combined with the dictionary of keyword arguments to form
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188 a dictionary of query names and values.
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189
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190 Query names (the keys) must be strings. Values may be strings,
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191 integers, floats, or DateTimes, and they may also be lists or
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192 namespaces containing these types. All arguments are marshalled with
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193 complex_marshal().
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194 '''
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195
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196 d = {}
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197 for arg in args:
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198 d.update(arg)
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199 d.update(kwargs)
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200
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201 hq = cgi.escape
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202 qlist = complex_marshal(d.items())
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203 for i in range(len(qlist)):
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204 k, m, v = qlist[i]
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205 qlist[i] = ('<input type="hidden" name="%s%s" value="%s">'
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206 % (hq(k), m, hq(str(v))))
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207
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208 return join(qlist, '\n')
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209
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210 def complex_marshal(pairs):
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211 '''Add request marshalling information to a list of name-value pairs.
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212
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213 Names must be strings. Values may be strings,
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214 integers, floats, or DateTimes, and they may also be lists or
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215 namespaces containing these types.
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216
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217 The list is edited in place so that each (name, value) pair
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218 becomes a (name, marshal, value) triple. The middle value is the
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219 request marshalling string. Integer, float, and DateTime values
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220 will have ":int", ":float", or ":date" as their marshal string.
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221 Lists will be flattened, and the elements given ":list" in
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222 addition to their simple marshal string. Dictionaries will be
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223 flattened and marshalled using ":record".
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224 '''
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225 i = len(pairs)
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226 while i > 0:
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227 i = i - 1
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228 k, v = pairs[i]
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229 m = ''
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230 sublist = None
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231 if isinstance(v, StringType):
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232 pass
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233 elif hasattr(v, 'items'):
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234 sublist = []
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235 for sk, sv in v.items():
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236 sm = simple_marshal(sv)
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237 sublist.append(('%s.%s' % (k, sk), '%s:record' % sm, sv))
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238 elif isinstance(v, ListType):
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239 sublist = []
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240 for sv in v:
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241 sm = simple_marshal(sv)
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242 sublist.append((k, '%s:list' % sm, sv))
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243 else:
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244 m = simple_marshal(v)
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245 if sublist is None:
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246 pairs[i] = (k, m, v)
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247 else:
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248 pairs[i:i + 1] = sublist
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249
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250 return pairs
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251
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252 def simple_marshal(v):
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253 if isinstance(v, StringType):
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254 return ''
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255 if isinstance(v, IntType):
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256 return ':int'
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257 if isinstance(v, FloatType):
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258 return ':float'
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259 if isinstance(v, DateTime):
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260 return ':date'
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261 return ''
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262
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263 def url_query(request, req_name="URL", omit=None):
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264 '''Construct a URL with a query string, using the current request.
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265
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266 request: the request object
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267 req_name: the name, such as "URL1" or "BASEPATH1", to get from request
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268 omit: sequence of name of query arguments to omit. If a name
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269 contains a colon, it is treated literally. Otherwise, it will
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270 match each argument name that starts with the name and a period or colon.
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271 '''
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272
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273 base = request[req_name]
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274 qs = request.get('QUERY_STRING', '')
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275
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276 if qs and omit:
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277 qsparts = split(qs, '&')
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278
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279 if isinstance(omit, StringType):
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280 omits = {omit: None}
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281 else:
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282 omits = {}
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283 for name in omit:
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284 omits[name] = None
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285 omitted = omits.has_key
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286
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287 unq = urllib.unquote
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288 for i in range(len(qsparts)):
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289 name = unq(split(qsparts[i], '=', 1)[0])
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290 if omitted(name):
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291 qsparts[i] = ''
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292 name = split(name, ':', 1)[0]
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293 if omitted(name):
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294 qsparts[i] = ''
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295 name = split(name, '.', 1)[0]
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296 if omitted(name):
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297 qsparts[i] = ''
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298
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299 qs = join(filter(None, qsparts), '&')
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300
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301 # We alway append '?' since arguments will be appended to the URL
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302 return '%s?%s' % (base, qs)
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