Mercurial > ift6266
comparison pycaptcha/Captcha/Visual/Base.py~ @ 87:4775b4195b4b
code pour la generation de captchas
| author | goldfinger |
|---|---|
| date | Thu, 11 Feb 2010 05:09:46 -0500 |
| parents | |
| children |
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| 86:b3d76ebf2fac | 87:4775b4195b4b |
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| 1 """ Captcha.Visual.BAse | |
| 2 | |
| 3 Base classes for visual CAPTCHAs. We use the Python Imaging Library | |
| 4 to manipulate these images. | |
| 5 """ | |
| 6 # | |
| 7 # PyCAPTCHA Package | |
| 8 # Copyright (C) 2004 Micah Dowty <micah@navi.cx> | |
| 9 # | |
| 10 | |
| 11 import Captcha | |
| 12 import Image | |
| 13 | |
| 14 __all__ = ['ImageCaptcha', 'Layer'] | |
| 15 | |
| 16 | |
| 17 class ImageCaptcha(Captcha.BaseCaptcha): | |
| 18 """Base class for image-based CAPTCHA tests. | |
| 19 The render() function generates the CAPTCHA image at the given size by | |
| 20 combining Layer instances from self.layers, which should be created by | |
| 21 the subclass-defined getLayers(). | |
| 22 """ | |
| 23 defaultSize = (256,96) | |
| 24 | |
| 25 def __init__(self, *args, **kwargs): | |
| 26 Captcha.BaseCaptcha.__init__(self) | |
| 27 self._layers = self.getLayers(*args, **kwargs) | |
| 28 | |
| 29 def getImage(self): | |
| 30 """Get a PIL image representing this CAPTCHA test, creating it if necessary""" | |
| 31 if not self._image: | |
| 32 self._image = self.render() | |
| 33 return self._image | |
| 34 | |
| 35 def getLayers(self): | |
| 36 """Subclasses must override this to return a list of Layer instances to render. | |
| 37 Lists within the list of layers are recursively rendered. | |
| 38 """ | |
| 39 return [] | |
| 40 | |
| 41 def render(self, size=None): | |
| 42 """Render this CAPTCHA, returning a PIL image""" | |
| 43 if size is None: | |
| 44 size = self.defaultSize | |
| 45 img = Image.new("RGB", size) | |
| 46 return self._renderList(self._layers, Image.new("RGB", size)) | |
| 47 | |
| 48 def _renderList(self, l, img): | |
| 49 for i in l: | |
| 50 if type(i) == tuple or type(i) == list: | |
| 51 img = self._renderList(i, img) | |
| 52 else: | |
| 53 img = i.render(img) or img | |
| 54 return img | |
| 55 | |
| 56 | |
| 57 class Layer(object): | |
| 58 """A renderable object representing part of a CAPTCHA. | |
| 59 The render() function should return approximately the same result, regardless | |
| 60 of the image size. This means any randomization must occur in the constructor. | |
| 61 | |
| 62 If the render() function returns something non-None, it is taken as an image to | |
| 63 replace the current image with. This can be used to implement transformations | |
| 64 that result in a separate image without having to copy the results back to the first. | |
| 65 """ | |
| 66 def render(self, img): | |
| 67 pass | |
| 68 | |
| 69 ### The End ### |