Mercurial > hg > CAPTCHAmiddleware

annotate captchamiddleware/middleware.py @ 1:478d13061336

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author k0s <k0scist@gmail.com>
date Sat, 06 Feb 2010 19:00:32 -0500
parents 21ec6325ae0e
children c861518b2a44
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1 """
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2 CAPTCHA middleware
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3 """
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4
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5 import os
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6 import random
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7 import sys
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8 from lxml import etree
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9 from lxmlmiddleware import LXMLMiddleware
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10 from skimpyGimpy import skimpyAPI
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11 from urllib2 import urlopen
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12 from webob import Request, exc
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14
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15 class CAPTCHAmiddleware(LXMLMiddleware):
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16 """
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17 put CAPTCHAs on forms for unauthorized users
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18 """
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19
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20 ### class level variables
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21 defaults = {
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22 'dictionary': '/usr/share/dict/words',
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23 'error': '<span class="error">Please type the CAPTCHA</span>',
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24 'minimum_length': 5,
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25 'path': "/input[@type='submit']",
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26 }
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27
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28 def __init__(self, app, **kw):
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29 self.app = app
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30
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31 # set instance parameters from kw and defaults
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32 for key in self.defaults:
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33 setattr(self, key, kw.get(key, self.defaults[key]))
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34 self.minimum_length = int(self.minimum_length)
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35 assert os.path.exists(self.dictionary)
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36
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37 # get dictionary
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38 if self.dictionary.startswith('http://') or self.dictionary.startswith('https://'):
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39 f = urlopen(self.dictionary)
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40 else:
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41 f = file(self.dictionary)
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42 self.words = [ i.strip() for i in f.readlines()
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43 if len(i.strip()) > self.minimum_length ]
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44 random.shuffle(self.words)
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45
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46
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47 def __call__(self, environ, start_response):
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48 request = Request(environ)
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49 if request.method == 'post' and not request.remote_user:
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50 pass # TODO: check CAPTCHA
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51
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52 return LXMLMiddleware.__call__(self, environ, start_response)
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53
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54 def manipulate(self, environ, tree):
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55 """manipulate the DOM; should return an etree._Element"""
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56
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57 request = Request(environ)
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58
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59 # don't use CAPTCHAs for authorized users
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60 if request.remote_user:
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61 return tree
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62
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63 for element in tree.findall(".//form[@method='post']"):
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64 key = random.Random().randint(0, len(self.words))
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65 word = self.words[key]
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66 captcha = skimpyAPI.Pre(word).data()
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67 string = '<div class="captcha">%s<input type="hidden" value="%s"/><input type="text" name="captcha"/></div>' % (captcha, key)
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68 addition = etree.fromstring(string)
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69 insertion_point = element.find('.' + self.path)
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70 insertion_point.addprevious(addition)
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71
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72 return tree
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73