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1 #
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2 # An example that presents CAPTCHA tests in a web environment
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3 # and gives the user a chance to solve them.
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4 #
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5 # This example is for use with Apache using mod_python and its
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6 # Publisher handler. For example, if your apache configuration
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7 # included something like:
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8 #
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9 # AddHandler python-program .py
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10 # PythonHandler mod_python.publisher
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11 #
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12 # You could place this script anywhere in your web space to see
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13 # the demo.
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14 #
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15 # --Micah <micah@navi.cx>
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16 #
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17
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18 from Captcha.Visual import Tests
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19 import Captcha
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20 from mod_python import apache
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21
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22
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23 def _getFactory(req):
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24 return Captcha.PersistentFactory("/tmp/pycaptcha_%s" % req.interpreter)
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25
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26
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27 def test(req, name=Tests.__all__[0]):
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28 """Show a newly generated CAPTCHA of the given class.
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29 Default is the first class name given in Tests.__all__
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30 """
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31 test = _getFactory(req).new(getattr(Tests, name))
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32
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33 # Make a list of tests other than the one we're using
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34 others = []
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35 for t in Tests.__all__:
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36 if t != name:
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37 others.append('<li><a href="?name=%s">%s</a></li>' % (t,t))
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38 others = "\n".join(others)
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39
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40 return """<html>
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41 <head>
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42 <title>PyCAPTCHA Example</title>
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43 </head>
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44 <body>
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45 <h1>PyCAPTCHA Example (for mod_python)</h1>
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46 <p>
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47 <b>%s</b>:
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48 %s
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49 </p>
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50
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51 <p><img src="image?id=%s"/></p>
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52 <p>
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53 <form action="solution" method="get">
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54 Enter the word shown:
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55 <input type="text" name="word"/>
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56 <input type="hidden" name="id" value="%s"/>
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57 </form>
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58 </p>
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59
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60 <p>
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61 Or try...
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62 <ul>
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63 %s
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64 </ul>
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65 </p>
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66
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67 </body>
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68 </html>
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69 """ % (test.__class__.__name__, test.__doc__, test.id, test.id, others)
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70
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71
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72 def image(req, id):
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73 """Generate an image for the CAPTCHA with the given ID string"""
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74 test = _getFactory(req).get(id)
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75 if not test:
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76 raise apache.SERVER_RETURN, apache.HTTP_NOT_FOUND
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77 req.content_type = "image/jpeg"
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78 test.render().save(req, "JPEG")
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79 return apache.OK
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80
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81
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82 def solution(req, id, word):
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83 """Grade a CAPTCHA given a solution word"""
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84 test = _getFactory(req).get(id)
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85 if not test:
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86 raise apache.SERVER_RETURN, apache.HTTP_NOT_FOUND
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87
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88 if not test.valid:
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89 # Invalid tests will always return False, to prevent
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90 # random trial-and-error attacks. This could be confusing to a user...
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91 result = "Test invalidated, try another test"
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92 elif test.testSolutions([word]):
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93 result = "Correct"
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94 else:
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95 result = "Incorrect"
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96
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97 return """<html>
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98 <head>
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99 <title>PyCAPTCHA Example</title>
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100 </head>
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101 <body>
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102 <h1>PyCAPTCHA Example</h1>
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103 <h2>%s</h2>
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104 <p><img src="image?id=%s"/></p>
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105 <p><b>%s</b></p>
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106 <p>You guessed: %s</p>
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107 <p>Possible solutions: %s</p>
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108 <p><a href="test">Try again</a></p>
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109 </body>
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110 </html>
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111 """ % (test.__class__.__name__, test.id, result, word, ", ".join(test.solutions))
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112
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113 ### The End ###
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