author | Alexandre Fayolle <alexandre.fayolle@logilab.fr> |
Wed, 07 Apr 2010 11:56:30 +0200 | |
branch | stable |
changeset 5171 | 1c2567af37dd |
parent 5037 | 7778a2bbdf9d |
child 5223 | 6abd6e3599f4 |
child 5421 | 8167de96c523 |
permissions | -rw-r--r-- |
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"""Simple captcha library, based on PIL. Monkey patch functions in this module |
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if you want something better... |
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:organization: Logilab |
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:copyright: 2009-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2. |
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses |
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""" |
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__docformat__ = "restructuredtext en" |
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from random import randint, choice |
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from cStringIO import StringIO |
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import Image, ImageFont, ImageDraw, ImageFilter |
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from time import time |
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from cubicweb import tags |
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from cubicweb.web import ProcessFormError, formwidgets as fw |
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def pil_captcha(text, fontfile, fontsize): |
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"""Generate a captcha image. Return a PIL image object. |
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adapted from http://code.activestate.com/recipes/440588/ |
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""" |
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# randomly select the foreground color |
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fgcolor = randint(0, 0xffff00) |
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# make the background color the opposite of fgcolor |
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bgcolor = fgcolor ^ 0xffffff |
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# create a font object |
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font = ImageFont.truetype(fontfile, fontsize) |
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# determine dimensions of the text |
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dim = font.getsize(text) |
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# create a new image slightly larger that the text |
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img = Image.new('RGB', (dim[0]+5, dim[1]+5), bgcolor) |
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draw = ImageDraw.Draw(img) |
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# draw 100 random colored boxes on the background |
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x, y = img.size |
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for num in xrange(100): |
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draw.rectangle((randint(0, x), randint(0, y), |
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randint(0, x), randint(0, y)), |
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fill=randint(0, 0xffffff)) |
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# add the text to the image |
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draw.text((3, 3), text, font=font, fill=fgcolor) |
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img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) |
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return img |
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def captcha(fontfile, fontsize, size=5, format='JPEG'): |
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"""Generate an arbitrary text, return it together with a buffer containing |
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the captcha image for the text |
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""" |
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text = u''.join(choice('QWERTYUOPASDFGHJKLZXCVBNM') for i in range(size)) |
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img = pil_captcha(text, fontfile, fontsize) |
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out = StringIO() |
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img.save(out, format) |
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out.seek(0) |
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return text, out |
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class CaptchaWidget(fw.TextInput): |
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def render(self, form, field, renderer=None): |
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# t=int(time()*100) to make sure img is not cached |
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src = form._cw.build_url('view', vid='captcha', t=int(time()*100), |
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captchakey=field.input_name(form)) |
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img = tags.img(src=src, alt=u'captcha') |
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img = u'<div class="captcha">%s</div>' % img |
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return img + super(CaptchaWidget, self).render(form, field, renderer) |
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def process_field_data(self, form, field): |
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captcha = form._cw.get_session_data(field.input_name(form), None, |
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pop=True) |
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val = super(CaptchaWidget, self).process_field_data(form, field) |
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if val is None: |
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return val # required will be checked by field |
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if captcha is None: |
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msg = form._cw._('unable to check captcha, please try again') |
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raise ProcessFormError(msg) |
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elif val.lower() != captcha.lower(): |
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msg = form._cw._('incorrect captcha value') |
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raise ProcessFormError(msg) |
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return val |