annotate MoinMoin/security/textcha.py @ 3107:c6e39279f83b

refactor logging usage
author Thomas Waldmann <tw AT waldmann-edv DOT de>
date Sat, 23 Feb 2008 22:59:30 +0100
parents ed1a433803c6
children a48929a5036c
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.server import getLogger
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28 logging = getLogger(__name__)
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29
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30 # use this to temporarily and selectively enable debug logging for this module
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31 #logging.setLevel(logging.DEBUG)
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32
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33 from MoinMoin import wikiutil
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34
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35 class TextCha(object):
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36 """ Text CAPTCHA support """
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37
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38 def __init__(self, request, question=None):
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39 """ Initialize the TextCha.
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40
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41 @param request: the request object
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42 @param question: see _init_qa()
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43 """
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44 self.request = request
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45 self.user_info = request.user.valid and request.user.name or request.remote_addr
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46 self.textchas = self._get_textchas()
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47 self._init_qa(question)
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48
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49 def _get_textchas(self):
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50 """ get textchas from the wiki config for the user's language (or default_language or en) """
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51 request = self.request
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52 cfg = request.cfg
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53 user = request.user
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54 disabled_group = cfg.textchas_disabled_group
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55 if disabled_group and user.name and request.dicts.has_member(disabled_group, user.name):
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56 return None
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57 textchas = cfg.textchas
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58 if textchas:
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59 lang = user.language or request.lang
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60 #logging.debug(u"TextCha: user.language == '%s'." % lang)
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61 if lang not in textchas:
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62 lang = cfg.language_default
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63 #logging.debug(u"TextCha: fallback to language_default == '%s'." % lang)
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64 if lang not in textchas:
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65 logging.error(u"TextCha: The textchas do not have content for language_default == '%s'! Falling back to English." % lang)
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66 lang = 'en'
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67 if lang not in textchas:
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68 logging.error(u"TextCha: The textchas do not have content for 'en', auto-disabling textchas!")
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69 cfg.textchas = None
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70 lang = None
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71 else:
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72 lang = None
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73 if lang is None:
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74 return None
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75 else:
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76 #logging.debug(u"TextCha: using lang = '%s'" % lang)
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77 return textchas[lang]
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78
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79 def _init_qa(self, question=None):
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80 """ Initialize the question / answer.
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81
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82 @param question: If given, the given question will be used.
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83 If None, a new question will be generated.
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84 """
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85 if self.is_enabled():
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86 if question is None:
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87 self.question = random.choice(self.textchas.keys())
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88 else:
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89 self.question = question
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90 try:
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91 self.answer_regex = self.textchas[self.question]
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92 self.answer_re = re.compile(self.answer_regex, re.U|re.I)
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93 except KeyError:
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94 # this question does not exist, thus there is no answer
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95 self.answer_regex = ur"[^.]*" # this shall never match!
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96 self.answer_re = re.compile(self.answer_regex, re.U|re.I)
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97 logging.warning(u"TextCha: Non-existing question '%s'. User '%s' trying to cheat?" % (
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98 self.question, self.user_info))
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99 except re.error:
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100 logging.error(u"TextCha: Invalid regex in answer for question '%s'" % self.question)
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101 self._init_qa()
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102
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103 def is_enabled(self):
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104 """ check if textchas are enabled.
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105
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106 They can be disabled for all languages if you use textchas = None or = {},
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107 also they can be disabled for some specific language, like:
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108 textchas = {
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109 'en': {
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110 'some question': 'some answer',
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111 # ...
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112 },
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113 'de': {}, # having no questions for 'de' means disabling textchas for 'de'
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114 # ...
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115 }
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116 """
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117 return not not self.textchas # we don't want to return the dict
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118
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119 def check_answer(self, given_answer):
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120 """ check if the given answer to the question is correct """
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121 if self.is_enabled():
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122 success = self.answer_re.match(given_answer.strip()) is not None
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123 success_status = success and u"success" or u"failure"
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124 logging.info(u"TextCha: %s (u='%s', a='%s', re='%s', q='%s')" % (
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125 success_status,
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126 self.user_info,
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127 given_answer,
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128 self.answer_regex,
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129 self.question,
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130 ))
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131 return success
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132 else:
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133 return True
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134
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135 def _make_form_values(self, question, given_answer):
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136 question_form = wikiutil.escape(question, True)
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137 given_answer_form = wikiutil.escape(given_answer, True)
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138 return question_form, given_answer_form
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139
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140 def _extract_form_values(self, form=None):
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141 if form is None:
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142 form = self.request.form
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143 question = form.get('textcha-question', [None])[0]
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144 given_answer = form.get('textcha-answer', [u''])[0]
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145 return question, given_answer
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146
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147 def render(self, form=None):
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148 """ Checks if textchas are enabled and returns HTML for one,
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149 or an empty string if they are not enabled.
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150
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151 @return: unicode result html
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152 """
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153 if self.is_enabled():
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154 question, given_answer = self._extract_form_values(form)
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155 if question is None:
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156 question = self.question
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157 question_form, given_answer_form = self._make_form_values(question, given_answer)
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158 result = u"""
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159 <div id="textcha">
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160 <span id="textcha-question">%s</span>
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161 <input type="hidden" name="textcha-question" value="%s">
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162 <input id="textcha-answer" type="text" name="textcha-answer" value="%s" size="20" maxlength="80">
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163 </div>
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164 """ % (wikiutil.escape(question), question_form, given_answer_form)
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165 else:
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166 result = u''
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167 return result
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168
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169 def check_answer_from_form(self, form=None):
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170 if self.is_enabled():
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171 question, given_answer = self._extract_form_values(form)
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172 self._init_qa(question)
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173 return self.check_answer(given_answer)
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174 else:
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175 return True
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176