1 | # -*- test-case-name: wokkel.test.test_data_form -*- |
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2 | # |
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3 | # Copyright (c) 2003-2010 Ralph Meijer |
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4 | # See LICENSE for details. |
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5 | |
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6 | """ |
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7 | Data Forms. |
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8 | |
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9 | Support for Data Forms as described in |
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10 | U{XEP-0004<http://www.xmpp.org/extensions/xep-0004.html>}, along with support |
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11 | for Field Standardization for Data Forms as described in |
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12 | U{XEP-0068<http://www.xmpp.org/extensions/xep-0068.html>}. |
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13 | """ |
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14 | |
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15 | from twisted.words.protocols.jabber.jid import JID |
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16 | from twisted.words.xish import domish |
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17 | |
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18 | NS_X_DATA = 'jabber:x:data' |
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19 | |
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20 | |
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21 | |
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22 | class Error(Exception): |
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23 | """ |
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24 | Data Forms error. |
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25 | """ |
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26 | |
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27 | |
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28 | |
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29 | class FieldNameRequiredError(Error): |
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30 | """ |
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31 | A field name is required for this field type. |
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32 | """ |
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33 | |
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34 | |
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35 | |
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36 | class TooManyValuesError(Error): |
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37 | """ |
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38 | This field is single-value. |
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39 | """ |
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40 | |
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41 | |
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42 | |
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43 | class Option(object): |
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44 | """ |
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45 | Data Forms field option. |
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46 | |
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47 | @ivar value: Value of this option. |
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48 | @type value: C{unicode} |
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49 | @ivar label: Optional label for this option. |
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50 | @type label: C{unicode} or C{NoneType}. |
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51 | """ |
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52 | |
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53 | def __init__(self, value, label=None): |
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54 | self.value = value |
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55 | self.label = label |
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56 | |
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57 | |
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58 | def __repr__(self): |
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59 | r = ["Option(", repr(self.value)] |
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60 | if self.label: |
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61 | r.append(", ") |
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62 | r.append(repr(self.label)) |
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63 | r.append(")") |
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64 | return u"".join(r) |
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65 | |
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66 | |
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67 | def toElement(self): |
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68 | """ |
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69 | Return the DOM representation of this option. |
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70 | |
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71 | @rtype: L{domish.Element}. |
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72 | """ |
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73 | option = domish.Element((NS_X_DATA, 'option')) |
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74 | option.addElement('value', content=self.value) |
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75 | if self.label: |
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76 | option['label'] = self.label |
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77 | return option |
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78 | |
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79 | |
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80 | @staticmethod |
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81 | def fromElement(element): |
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82 | valueElements = list(domish.generateElementsQNamed(element.children, |
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83 | 'value', NS_X_DATA)) |
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84 | if not valueElements: |
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85 | raise Error("Option has no value") |
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86 | |
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87 | label = element.getAttribute('label') |
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88 | return Option(unicode(valueElements[0]), label) |
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89 | |
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90 | |
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91 | class Field(object): |
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92 | """ |
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93 | Data Forms field. |
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94 | |
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95 | @ivar fieldType: Type of this field. One of C{'boolean'}, C{'fixed'}, |
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96 | C{'hidden'}, C{'jid-multi'}, C{'jid-single'}, |
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97 | C{'list-multi'}, {'list-single'}, C{'text-multi'}, |
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98 | C{'text-private'}, C{'text-single'}. |
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99 | |
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100 | The default is C{'text-single'}. |
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101 | @type fieldType: C{str} |
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102 | @ivar var: Field name. Optional if L{fieldType} is C{'fixed'}. |
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103 | @type var: C{str} |
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104 | @ivar label: Human readable label for this field. |
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105 | @type label: C{unicode} |
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106 | @ivar values: The values for this field, for multi-valued field |
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107 | types, as a list of C{bool}, C{unicode} or L{JID}. |
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108 | @type values: C{list} |
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109 | @ivar options: List of possible values to choose from in a response |
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110 | to this form as a list of L{Option}s. |
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111 | @type options: C{list}. |
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112 | @ivar desc: Human readable description for this field. |
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113 | @type desc: C{unicode} |
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114 | @ivar required: Whether the field is required to be provided in a |
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115 | response to this form. |
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116 | @type required: C{bool}. |
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117 | """ |
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118 | |
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119 | def __init__(self, fieldType='text-single', var=None, value=None, |
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120 | values=None, options=None, label=None, desc=None, |
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121 | required=False): |
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122 | """ |
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123 | Initialize this field. |
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124 | |
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125 | See the identically named instance variables for descriptions. |
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126 | |
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127 | If C{value} is not C{None}, it overrides C{values}, setting the |
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128 | given value as the only value for this field. |
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129 | """ |
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130 | |
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131 | self.fieldType = fieldType |
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132 | self.var = var |
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133 | if value is not None: |
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134 | self.value = value |
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135 | else: |
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136 | self.values = values or [] |
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137 | |
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138 | try: |
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139 | self.options = [Option(value, label) |
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140 | for value, label in options.iteritems()] |
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141 | except AttributeError: |
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142 | self.options = options or [] |
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143 | |
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144 | self.label = label |
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145 | self.desc = desc |
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146 | self.required = required |
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147 | |
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148 | |
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149 | def __repr__(self): |
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150 | r = ["Field(fieldType=", repr(self.fieldType)] |
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151 | if self.var: |
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152 | r.append(", var=") |
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153 | r.append(repr(self.var)) |
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154 | if self.label: |
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155 | r.append(", label=") |
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156 | r.append(repr(self.label)) |
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157 | if self.desc: |
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158 | r.append(", desc=") |
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159 | r.append(repr(self.desc)) |
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160 | if self.required: |
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161 | r.append(", required=") |
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162 | r.append(repr(self.required)) |
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163 | if self.values: |
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164 | r.append(", values=") |
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165 | r.append(repr(self.values)) |
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166 | if self.options: |
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167 | r.append(", options=") |
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168 | r.append(repr(self.options)) |
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169 | r.append(")") |
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170 | return u"".join(r) |
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171 | |
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172 | |
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173 | def __value_set(self, value): |
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174 | """ |
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175 | Setter of value property. |
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176 | |
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177 | Sets C{value} as the only element of L{values}. |
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178 | |
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179 | @type value: C{bool}, C{unicode} or L{JID} |
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180 | """ |
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181 | self.values = [value] |
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182 | |
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183 | |
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184 | def __value_get(self): |
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185 | """ |
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186 | Getter of value property. |
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187 | |
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188 | Returns the first element of L{values}, if present, or C{None}. |
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189 | """ |
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190 | |
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191 | if self.values: |
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192 | return self.values[0] |
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193 | else: |
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194 | return None |
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195 | |
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196 | |
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197 | value = property(__value_get, __value_set, doc=""" |
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198 | The value for this field, for single-valued field types. |
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199 | |
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200 | This is a special property accessing L{values}. Writing to this |
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201 | property empties L{values} and then sets the given value as the |
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202 | only element of L{values}. Reading from this propery returns the |
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203 | first element of L{values}. |
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204 | """) |
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205 | |
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206 | |
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207 | def typeCheck(self): |
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208 | """ |
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209 | Check field properties agains the set field type. |
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210 | """ |
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211 | if self.var is None and self.fieldType != 'fixed': |
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212 | raise FieldNameRequiredError() |
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213 | |
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214 | if self.values: |
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215 | if (self.fieldType not in ('hidden', 'jid-multi', 'list-multi', |
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216 | 'text-multi', None) and |
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217 | len(self.values) > 1): |
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218 | raise TooManyValuesError() |
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219 | |
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220 | newValues = [] |
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221 | for value in self.values: |
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222 | if self.fieldType == 'boolean': |
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223 | if isinstance(value, (str, unicode)): |
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224 | checkValue = value.lower() |
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225 | if not checkValue in ('0', '1', 'false', 'true'): |
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226 | raise ValueError("Not a boolean") |
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227 | value = checkValue in ('1', 'true') |
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228 | value = bool(value) |
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229 | elif self.fieldType in ('jid-single', 'jid-multi'): |
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230 | if not hasattr(value, 'full'): |
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231 | value = JID(value) |
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232 | |
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233 | newValues.append(value) |
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234 | |
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235 | self.values = newValues |
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236 | |
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237 | |
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238 | def toElement(self, asForm=False): |
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239 | """ |
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240 | Return the DOM representation of this Field. |
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241 | |
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242 | @rtype: L{domish.Element}. |
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243 | """ |
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244 | |
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245 | self.typeCheck() |
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246 | |
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247 | field = domish.Element((NS_X_DATA, 'field')) |
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248 | |
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249 | if self.fieldType: |
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250 | field['type'] = self.fieldType |
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251 | |
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252 | if self.var is not None: |
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253 | field['var'] = self.var |
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254 | |
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255 | for value in self.values: |
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256 | if isinstance(value, bool): |
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257 | value = unicode(value).lower() |
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258 | else: |
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259 | value = unicode(value) |
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260 | |
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261 | field.addElement('value', content=value) |
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262 | |
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263 | if asForm: |
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264 | if self.fieldType in ('list-single', 'list-multi'): |
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265 | for option in self.options: |
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266 | field.addChild(option.toElement()) |
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267 | |
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268 | if self.label is not None: |
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269 | field['label'] = self.label |
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270 | |
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271 | if self.desc is not None: |
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272 | field.addElement('desc', content=self.desc) |
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273 | |
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274 | if self.required: |
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275 | field.addElement('required') |
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276 | |
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277 | return field |
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278 | |
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279 | |
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280 | @staticmethod |
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281 | def _parse_desc(field, element): |
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282 | desc = unicode(element) |
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283 | if desc: |
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284 | field.desc = desc |
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285 | |
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286 | |
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287 | @staticmethod |
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288 | def _parse_option(field, element): |
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289 | field.options.append(Option.fromElement(element)) |
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290 | |
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291 | |
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292 | @staticmethod |
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293 | def _parse_required(field, element): |
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294 | field.required = True |
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295 | |
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296 | |
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297 | @staticmethod |
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298 | def _parse_value(field, element): |
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299 | value = unicode(element) |
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300 | field.values.append(value) |
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301 | |
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302 | |
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303 | @staticmethod |
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304 | def fromElement(element): |
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305 | field = Field(None) |
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306 | |
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307 | for eAttr, fAttr in {'type': 'fieldType', |
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308 | 'var': 'var', |
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309 | 'label': 'label'}.iteritems(): |
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310 | value = element.getAttribute(eAttr) |
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311 | if value: |
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312 | setattr(field, fAttr, value) |
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313 | |
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314 | |
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315 | for child in element.elements(): |
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316 | if child.uri != NS_X_DATA: |
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317 | continue |
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318 | |
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319 | func = getattr(Field, '_parse_' + child.name, None) |
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320 | if func: |
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321 | func(field, child) |
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322 | |
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323 | return field |
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324 | |
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325 | |
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326 | @staticmethod |
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327 | def fromDict(fieldDict): |
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328 | """ |
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329 | Create a field from a dictionary. |
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330 | |
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331 | This is a short hand for passing arguments directly on Field object |
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332 | creation. The field type is represented by the C{'type'} key. For |
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333 | C{'options'} the value is not a list of L{Option}s, but a dictionary |
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334 | keyed by value, with an optional label as value. |
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335 | """ |
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336 | kwargs = fieldDict.copy() |
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337 | |
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338 | if 'type' in fieldDict: |
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339 | kwargs['fieldType'] = fieldDict['type'] |
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340 | del kwargs['type'] |
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341 | |
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342 | if 'options' in fieldDict: |
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343 | options = [] |
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344 | for value, label in fieldDict['options'].iteritems(): |
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345 | options.append(Option(value, label)) |
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346 | kwargs['options'] = options |
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347 | |
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348 | return Field(**kwargs) |
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349 | |
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350 | |
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351 | |
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352 | class Form(object): |
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353 | """ |
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354 | Data Form. |
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355 | |
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356 | There are two similarly named properties of forms. The C{formType} is the |
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357 | the so-called type of the form, and is set as the C{'type'} attribute |
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358 | on the form's root element. |
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359 | |
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360 | The Field Standardization specification in XEP-0068, defines a way to |
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361 | provide a context for the field names used in this form, by setting a |
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362 | special hidden field named C{'FORM_TYPE'}, to put the names of all |
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363 | other fields in the namespace of the value of that field. This namespace |
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364 | is recorded in the C{formNamespace} instance variable. |
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365 | |
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366 | @ivar formType: Type of form. One of C{'form'}, C{'submit'}, {'cancel'}, |
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367 | or {'result'}. |
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368 | @type formType: C{str} |
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369 | |
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370 | @ivar title: Natural language title of the form. |
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371 | @type title: C{unicode} |
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372 | |
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373 | @ivar instructions: Natural language instructions as a list of C{unicode} |
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374 | strings without line breaks. |
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375 | @type instructions: C{list} |
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376 | |
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377 | @ivar formNamespace: The optional namespace of the field names for this |
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378 | form. This goes in the special field named C{'FORM_TYPE'}, if set. |
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379 | @type formNamespace: C{str}. |
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380 | |
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381 | @ivar fields: Dictionary of named fields. Note that this is meant to be |
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382 | used for reading, only. One should use L{addField} or L{makeFields} and |
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383 | L{removeField} for adding and removing fields. |
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384 | @type fields: C{dict} |
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385 | |
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386 | @ivar fieldList: List of all fields, in the order they are added. Like |
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387 | C{fields}, this is meant to be used for reading, only. |
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388 | @type fieldList: C{list} |
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389 | """ |
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390 | |
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391 | def __init__(self, formType, title=None, instructions=None, |
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392 | formNamespace=None, fields=None): |
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393 | self.formType = formType |
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394 | self.title = title |
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395 | self.instructions = instructions or [] |
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396 | self.formNamespace = formNamespace |
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397 | |
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398 | self.fieldList = [] |
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399 | self.fields = {} |
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400 | |
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401 | if fields: |
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402 | for field in fields: |
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403 | self.addField(field) |
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404 | |
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405 | def __repr__(self): |
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406 | r = ["Form(formType=", repr(self.formType)] |
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407 | |
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408 | if self.title: |
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409 | r.append(", title=") |
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410 | r.append(repr(self.title)) |
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411 | if self.instructions: |
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412 | r.append(", instructions=") |
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413 | r.append(repr(self.instructions)) |
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414 | if self.formNamespace: |
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415 | r.append(", formNamespace=") |
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416 | r.append(repr(self.formNamespace)) |
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417 | if self.fieldList: |
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418 | r.append(", fields=") |
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419 | r.append(repr(self.fieldList)) |
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420 | r.append(")") |
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421 | return u"".join(r) |
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422 | |
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423 | |
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424 | def addField(self, field): |
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425 | """ |
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426 | Add a field to this form. |
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427 | |
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428 | Fields are added in order, and C{fields} is a dictionary of the |
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429 | named fields, that is kept in sync only if this method is used for |
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430 | adding new fields. Multiple fields with the same name are disallowed. |
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431 | """ |
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432 | if field.var is not None: |
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433 | if field.var in self.fields: |
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434 | raise Error("Duplicate field %r" % field.var) |
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435 | |
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436 | self.fields[field.var] = field |
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437 | |
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438 | self.fieldList.append(field) |
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439 | |
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440 | |
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441 | def removeField(self, field): |
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442 | """ |
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443 | Remove a field from this form. |
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444 | """ |
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445 | self.fieldList.remove(field) |
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446 | |
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447 | if field.var is not None: |
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448 | del self.fields[field.var] |
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449 | |
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450 | |
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451 | def makeFields(self, values, fieldDefs=None, filterUnknown=True): |
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452 | """ |
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453 | Create fields from values and add them to this form. |
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454 | |
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455 | This creates fields from a mapping of name to value(s) and adds them to |
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456 | this form. It is typically used for generating outgoing forms. |
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457 | |
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458 | If C{fieldDefs} is not C{None}, this is used to fill in |
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459 | additional properties of fields, like the field types, labels and |
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460 | possible options. |
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461 | |
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462 | If C{filterUnknown} is C{True} and C{fieldDefs} is not C{None}, fields |
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463 | will only be created from C{values} with a corresponding entry in |
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464 | C{fieldDefs}. |
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465 | |
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466 | If the field type is unknown, the field type is C{None}. When the form |
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467 | is rendered using L{toElement}, these fields will have no C{'type'} |
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468 | attribute, and it is up to the receiving party to interpret the values |
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469 | properly (e.g. by knowing about the FORM_TYPE in L{formNamespace} and |
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470 | the field name). |
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471 | |
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472 | @param values: Values to create fields from. |
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473 | @type values: C{dict} |
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474 | |
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475 | @param fieldDefs: Field definitions as a dictionary. See |
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476 | L{wokkel.iwokkel.IPubSubService.getConfigurationOptions} |
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477 | @type fieldDefs: C{dict} |
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478 | |
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479 | @param filterUnknown: If C{True}, ignore fields that are not in |
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480 | C{fieldDefs}. |
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481 | @type filterUnknown: C{bool} |
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482 | """ |
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483 | for name, value in values.iteritems(): |
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484 | fieldDict = {'var': name, |
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485 | 'type': None} |
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486 | |
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487 | if fieldDefs is not None: |
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488 | if name in fieldDefs: |
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489 | fieldDict.update(fieldDefs[name]) |
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490 | elif filterUnknown: |
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491 | continue |
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492 | |
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493 | if isinstance(value, list): |
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494 | fieldDict['values'] = value |
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495 | else: |
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496 | fieldDict['value'] = value |
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497 | |
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498 | self.addField(Field.fromDict(fieldDict)) |
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499 | |
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500 | |
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501 | def toElement(self): |
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502 | """ |
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503 | Return the DOM representation of this Form. |
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504 | |
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505 | @rtype: L{domish.Element} |
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506 | """ |
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507 | form = domish.Element((NS_X_DATA, 'x')) |
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508 | form['type'] = self.formType |
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509 | |
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510 | if self.title: |
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511 | form.addElement('title', content=self.title) |
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512 | |
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513 | for instruction in self.instructions: |
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514 | form.addElement('instructions', content=instruction) |
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515 | |
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516 | if self.formNamespace is not None: |
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517 | field = Field('hidden', 'FORM_TYPE', self.formNamespace) |
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518 | form.addChild(field.toElement()) |
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519 | |
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520 | for field in self.fieldList: |
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521 | form.addChild(field.toElement(self.formType=='form')) |
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522 | |
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523 | return form |
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524 | |
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525 | |
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526 | @staticmethod |
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527 | def _parse_title(form, element): |
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528 | title = unicode(element) |
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529 | if title: |
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530 | form.title = title |
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531 | |
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532 | |
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533 | @staticmethod |
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534 | def _parse_instructions(form, element): |
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535 | instructions = unicode(element) |
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536 | if instructions: |
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537 | form.instructions.append(instructions) |
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538 | |
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539 | |
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540 | @staticmethod |
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541 | def _parse_field(form, element): |
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542 | field = Field.fromElement(element) |
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543 | if (field.var == "FORM_TYPE" and |
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544 | field.fieldType == 'hidden' and |
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545 | field.value): |
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546 | form.formNamespace = field.value |
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547 | else: |
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548 | form.addField(field) |
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549 | |
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550 | @staticmethod |
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551 | def fromElement(element): |
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552 | if (element.uri, element.name) != ((NS_X_DATA, 'x')): |
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553 | raise Error("Element provided is not a Data Form") |
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554 | |
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555 | form = Form(element.getAttribute("type")) |
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556 | |
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557 | for child in element.elements(): |
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558 | if child.uri != NS_X_DATA: |
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559 | continue |
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560 | |
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561 | func = getattr(Form, '_parse_' + child.name, None) |
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562 | if func: |
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563 | func(form, child) |
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564 | |
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565 | return form |
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566 | |
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567 | |
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568 | def getValues(self): |
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569 | """ |
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570 | Extract values from the named form fields. |
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571 | |
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572 | For all named fields, the corresponding value or values are |
---|
573 | returned in a dictionary keyed by the field name. For multi-value |
---|
574 | fields, the dictionary value is a list, otherwise a single value. |
---|
575 | |
---|
576 | If a field has no type, and the field has multiple values, the value of |
---|
577 | the dictionary entry is the list of values. Otherwise, it will be a |
---|
578 | single value. |
---|
579 | |
---|
580 | @rtype: C{dict} |
---|
581 | """ |
---|
582 | values = {} |
---|
583 | |
---|
584 | for name, field in self.fields.iteritems(): |
---|
585 | if (field.fieldType in ('jid-multi', 'list-multi', 'text-multi') or |
---|
586 | (field.fieldType is None and len(field.values) > 1)): |
---|
587 | value = field.values |
---|
588 | else: |
---|
589 | value = field.value |
---|
590 | |
---|
591 | values[name] = value |
---|
592 | |
---|
593 | return values |
---|
594 | |
---|
595 | |
---|
596 | def typeCheck(self, fieldDefs=None, filterUnknown=False): |
---|
597 | """ |
---|
598 | Check values of fields according to the field definition. |
---|
599 | |
---|
600 | This method walks all named fields to check their values against their |
---|
601 | type, and is typically used for forms received from other entities. The |
---|
602 | field definition in C{fieldDefs} is used to check the field type. |
---|
603 | |
---|
604 | If C{filterUnknown} is C{True}, fields that are not present in |
---|
605 | C{fieldDefs} are removed from the form. |
---|
606 | |
---|
607 | If the field type is C{None} (when not set by the sending entity), |
---|
608 | the type from the field definitition is used, or C{'text-single'} if |
---|
609 | that is not set. |
---|
610 | |
---|
611 | If C{fieldDefs} is None, an empty dictionary is assumed. This is |
---|
612 | useful for coercing boolean and JID values on forms with type |
---|
613 | C{'form'}. |
---|
614 | |
---|
615 | @param fieldDefs: Field definitions as a dictionary. See |
---|
616 | L{wokkel.iwokkel.IPubSubService.getConfigurationOptions} |
---|
617 | @type fieldDefs: C{dict} |
---|
618 | |
---|
619 | @param filterUnknown: If C{True}, remove fields that are not in |
---|
620 | C{fieldDefs}. |
---|
621 | @type filterUnknown: C{bool} |
---|
622 | """ |
---|
623 | |
---|
624 | if fieldDefs is None: |
---|
625 | fieldDefs = {} |
---|
626 | |
---|
627 | filtered = [] |
---|
628 | |
---|
629 | for name, field in self.fields.iteritems(): |
---|
630 | if name in fieldDefs: |
---|
631 | fieldDef = fieldDefs[name] |
---|
632 | if 'type' not in fieldDef: |
---|
633 | fieldDef['type'] = 'text-single' |
---|
634 | |
---|
635 | if field.fieldType is None: |
---|
636 | field.fieldType = fieldDef['type'] |
---|
637 | elif field.fieldType != fieldDef['type']: |
---|
638 | raise TypeError("Field type for %r is %r, expected %r" % |
---|
639 | (name, |
---|
640 | field.fieldType, |
---|
641 | fieldDef['type'])) |
---|
642 | else: |
---|
643 | # Field type is correct |
---|
644 | pass |
---|
645 | field.typeCheck() |
---|
646 | elif filterUnknown: |
---|
647 | filtered.append(field) |
---|
648 | elif field.fieldType is not None: |
---|
649 | field.typeCheck() |
---|
650 | else: |
---|
651 | # Unknown field without type, no checking, no filtering |
---|
652 | pass |
---|
653 | |
---|
654 | for field in filtered: |
---|
655 | self.removeField(field) |
---|
656 | |
---|
657 | |
---|
658 | |
---|
659 | def findForm(element, formNamespace): |
---|
660 | """ |
---|
661 | Find a Data Form. |
---|
662 | |
---|
663 | Look for an element that represents a Data Form with the specified |
---|
664 | form namespace as a child element of the given element. |
---|
665 | """ |
---|
666 | if not element: |
---|
667 | return None |
---|
668 | |
---|
669 | for child in element.elements(): |
---|
670 | if (child.uri, child.name) == ((NS_X_DATA, 'x')): |
---|
671 | form = Form.fromElement(child) |
---|
672 | |
---|
673 | if (form.formNamespace == formNamespace or |
---|
674 | not form.formNamespace and form.formType=='cancel'): |
---|
675 | return form |
---|
676 | |
---|
677 | return None |
---|