annotate MoinMoin/security/textcha.py @ 4822:d44a9c23438c

Groups2009: script.migration.wikiutil160a and security.textcha work with the new groups code.
author Dmitrijs Milajevs <dimazest@gmail.com>
date Thu, 25 Jun 2009 14:50:45 +0200
parents 5ad5753ae311
children 9d510417add0
rev   line source
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1 # -*- coding: iso-8859-1 -*-
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2 """
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3 MoinMoin - Text CAPTCHAs
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4
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5 This is just asking some (admin configured) questions and
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6 checking if the answer is as expected. It is up to the wiki
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7 admin to setup questions that a bot can not easily answer, but
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8 humans can. It is recommended to setup SITE SPECIFIC questions
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9 and not to share the questions with other sites (if everyone
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10 asks the same questions / expects the same answers, spammers
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11 could adapt to that).
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12
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13 TODO:
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14 * roundtrip the question in some other way:
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15 * use safe encoding / encryption for the q
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16 * make sure a q/a pair in the POST is for the q in the GET before
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17 * make some nice CSS
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18 * make similar changes to GUI editor
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19
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20 @copyright: 2007 by MoinMoin:ThomasWaldmann
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21 @license: GNU GPL, see COPYING for details.
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22 """
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23
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24 import re
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25 import random
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26
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27 from MoinMoin import log
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28 logging = log.getLogger(__name__)
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29
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30 from MoinMoin import wikiutil
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31
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32 class TextCha(object):
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33 """ Text CAPTCHA support """
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34
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35 def __init__(self, request, question=None):
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36 """ Initialize the TextCha.
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37
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38 @param request: the request object
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39 @param question: see _init_qa()
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40 """
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41 self.request = request
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42 self.user_info = request.user.valid and request.user.name or request.remote_addr
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43 self.textchas = self._get_textchas()
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44 self._init_qa(question)
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45
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46 def _get_textchas(self):
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47 """ get textchas from the wiki config for the user's language (or default_language or en) """
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48 request = self.request
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49 groups = request.groups
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50 cfg = request.cfg
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51 user = request.user
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52 disabled_group = cfg.textchas_disabled_group
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53 if disabled_group and user.name and disabled_group in groups and user.name in groups[disabled_group]:
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54 return None
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55 textchas = cfg.textchas
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56 if textchas:
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57 lang = user.language or request.lang
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58 logging.debug(u"TextCha: user.language == '%s'." % lang)
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59 if lang not in textchas:
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60 lang = cfg.language_default
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61 logging.debug(u"TextCha: fallback to language_default == '%s'." % lang)
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62 if lang not in textchas:
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63 logging.error(u"TextCha: The textchas do not have content for language_default == '%s'! Falling back to English." % lang)
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64 lang = 'en'
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65 if lang not in textchas:
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66 logging.error(u"TextCha: The textchas do not have content for 'en', auto-disabling textchas!")
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67 cfg.textchas = None
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68 lang = None
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69 else:
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70 lang = None
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71 if lang is None:
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72 return None
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73 else:
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74 logging.debug(u"TextCha: using lang = '%s'" % lang)
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75 return textchas[lang]
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76
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77 def _init_qa(self, question=None):
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78 """ Initialize the question / answer.
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79
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80 @param question: If given, the given question will be used.
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81 If None, a new question will be generated.
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82 """
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83 if self.is_enabled():
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84 if question is None:
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85 self.question = random.choice(self.textchas.keys())
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86 else:
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87 self.question = question
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88 try:
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89 self.answer_regex = self.textchas[self.question]
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90 self.answer_re = re.compile(self.answer_regex, re.U|re.I)
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91 except KeyError:
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92 # this question does not exist, thus there is no answer
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93 self.answer_regex = ur"[Never match for cheaters]"
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94 self.answer_re = None
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95 logging.warning(u"TextCha: Non-existing question '%s'. User '%s' trying to cheat?" % (
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96 self.question, self.user_info))
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97 except re.error:
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98 logging.error(u"TextCha: Invalid regex in answer for question '%s'" % self.question)
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99 self._init_qa()
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100
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101 def is_enabled(self):
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102 """ check if textchas are enabled.
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103
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104 They can be disabled for all languages if you use textchas = None or = {},
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105 also they can be disabled for some specific language, like:
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106 textchas = {
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107 'en': {
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108 'some question': 'some answer',
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109 # ...
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110 },
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111 'de': {}, # having no questions for 'de' means disabling textchas for 'de'
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112 # ...
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113 }
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114 """
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115 return not not self.textchas # we don't want to return the dict
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116
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117 def check_answer(self, given_answer):
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118 """ check if the given answer to the question is correct """
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119 if self.is_enabled():
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120 if self.answer_re is not None:
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121 success = self.answer_re.match(given_answer.strip()) is not None
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122 else:
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123 # someone trying to cheat!?
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124 success = False
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125 success_status = success and u"success" or u"failure"
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126 logging.info(u"TextCha: %s (u='%s', a='%s', re='%s', q='%s')" % (
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127 success_status,
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128 self.user_info,
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129 given_answer,
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130 self.answer_regex,
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131 self.question,
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132 ))
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133 return success
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134 else:
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135 return True
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136
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137 def _make_form_values(self, question, given_answer):
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138 question_form = wikiutil.escape(question, True)
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139 given_answer_form = wikiutil.escape(given_answer, True)
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140 return question_form, given_answer_form
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141
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142 def _extract_form_values(self, form=None):
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143 if form is None:
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144 form = self.request.form
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145 question = form.get('textcha-question')
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146 given_answer = form.get('textcha-answer', u'')
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147 return question, given_answer
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148
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149 def render(self, form=None):
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150 """ Checks if textchas are enabled and returns HTML for one,
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151 or an empty string if they are not enabled.
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152
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153 @return: unicode result html
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154 """
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155 if self.is_enabled():
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156 question, given_answer = self._extract_form_values(form)
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157 if question is None:
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158 question = self.question
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159 question_form, given_answer_form = self._make_form_values(question, given_answer)
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160 result = u"""
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161 <div id="textcha">
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162 <span id="textcha-question">%s</span>
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163 <input type="hidden" name="textcha-question" value="%s">
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164 <input id="textcha-answer" type="text" name="textcha-answer" value="%s" size="20" maxlength="80">
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165 </div>
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166 """ % (wikiutil.escape(question), question_form, given_answer_form)
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167 else:
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168 result = u''
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169 return result
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170
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171 def check_answer_from_form(self, form=None):
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172 if self.is_enabled():
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173 question, given_answer = self._extract_form_values(form)
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174 self._init_qa(question)
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175 return self.check_answer(given_answer)
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176 else:
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177 return True
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178