annotate MoinMoin/security/textcha.py @ 3070:ed1a433803c6

PEP8 fixes
author Reimar Bauer <rb.proj AT googlemail DOT com>
date Fri, 22 Feb 2008 19:28:52 +0100
parents 7b0aadb97d01
children c6e39279f83b
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 import logging
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27
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28 from MoinMoin import wikiutil
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29
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30 class TextCha(object):
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31 """ Text CAPTCHA support """
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32
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33 def __init__(self, request, question=None):
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34 """ Initialize the TextCha.
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35
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36 @param request: the request object
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37 @param question: see _init_qa()
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38 """
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39 self.request = request
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40 self.user_info = request.user.valid and request.user.name or request.remote_addr
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41 self.textchas = self._get_textchas()
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42 self._init_qa(question)
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43
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44 def _get_textchas(self):
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45 """ get textchas from the wiki config for the user's language (or default_language or en) """
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46 request = self.request
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47 cfg = request.cfg
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48 user = request.user
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49 disabled_group = cfg.textchas_disabled_group
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50 if disabled_group and user.name and request.dicts.has_member(disabled_group, user.name):
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51 return None
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52 textchas = cfg.textchas
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53 if textchas:
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54 lang = user.language or request.lang
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55 #logging.debug(u"TextCha: user.language == '%s'." % lang)
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56 if lang not in textchas:
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57 lang = cfg.language_default
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58 #logging.debug(u"TextCha: fallback to language_default == '%s'." % lang)
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59 if lang not in textchas:
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60 logging.error(u"TextCha: The textchas do not have content for language_default == '%s'! Falling back to English." % lang)
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61 lang = 'en'
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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 'en', auto-disabling textchas!")
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64 cfg.textchas = None
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65 lang = None
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66 else:
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67 lang = None
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68 if lang is None:
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69 return None
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70 else:
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71 #logging.debug(u"TextCha: using lang = '%s'" % lang)
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72 return textchas[lang]
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73
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74 def _init_qa(self, question=None):
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75 """ Initialize the question / answer.
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76
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77 @param question: If given, the given question will be used.
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78 If None, a new question will be generated.
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79 """
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80 if self.is_enabled():
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81 if question is None:
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82 self.question = random.choice(self.textchas.keys())
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83 else:
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84 self.question = question
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85 try:
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86 self.answer_regex = self.textchas[self.question]
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87 self.answer_re = re.compile(self.answer_regex, re.U|re.I)
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88 except KeyError:
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89 # this question does not exist, thus there is no answer
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90 self.answer_regex = ur"[^.]*" # this shall never match!
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91 self.answer_re = re.compile(self.answer_regex, re.U|re.I)
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92 logging.warning(u"TextCha: Non-existing question '%s'. User '%s' trying to cheat?" % (
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93 self.question, self.user_info))
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94 except re.error:
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95 logging.error(u"TextCha: Invalid regex in answer for question '%s'" % self.question)
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96 self._init_qa()
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97
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98 def is_enabled(self):
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99 """ check if textchas are enabled.
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100
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101 They can be disabled for all languages if you use textchas = None or = {},
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102 also they can be disabled for some specific language, like:
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103 textchas = {
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104 'en': {
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105 'some question': 'some answer',
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106 # ...
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107 },
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108 'de': {}, # having no questions for 'de' means disabling textchas for 'de'
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109 # ...
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110 }
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111 """
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112 return not not self.textchas # we don't want to return the dict
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113
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114 def check_answer(self, given_answer):
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115 """ check if the given answer to the question is correct """
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116 if self.is_enabled():
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117 success = self.answer_re.match(given_answer.strip()) is not None
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118 success_status = success and u"success" or u"failure"
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119 logging.info(u"TextCha: %s (u='%s', a='%s', re='%s', q='%s')" % (
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120 success_status,
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121 self.user_info,
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122 given_answer,
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123 self.answer_regex,
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124 self.question,
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125 ))
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126 return success
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127 else:
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128 return True
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129
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130 def _make_form_values(self, question, given_answer):
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131 question_form = wikiutil.escape(question, True)
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132 given_answer_form = wikiutil.escape(given_answer, True)
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133 return question_form, given_answer_form
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134
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135 def _extract_form_values(self, form=None):
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136 if form is None:
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137 form = self.request.form
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138 question = form.get('textcha-question', [None])[0]
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139 given_answer = form.get('textcha-answer', [u''])[0]
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140 return question, given_answer
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141
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142 def render(self, form=None):
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143 """ Checks if textchas are enabled and returns HTML for one,
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144 or an empty string if they are not enabled.
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145
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146 @return: unicode result html
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147 """
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148 if self.is_enabled():
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149 question, given_answer = self._extract_form_values(form)
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150 if question is None:
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151 question = self.question
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152 question_form, given_answer_form = self._make_form_values(question, given_answer)
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153 result = u"""
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154 <div id="textcha">
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155 <span id="textcha-question">%s</span>
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156 <input type="hidden" name="textcha-question" value="%s">
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157 <input id="textcha-answer" type="text" name="textcha-answer" value="%s" size="20" maxlength="80">
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158 </div>
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159 """ % (wikiutil.escape(question), question_form, given_answer_form)
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160 else:
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161 result = u''
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162 return result
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163
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164 def check_answer_from_form(self, form=None):
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165 if self.is_enabled():
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166 question, given_answer = self._extract_form_values(form)
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167 self._init_qa(question)
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168 return self.check_answer(given_answer)
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169 else:
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170 return True
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171