[rql rewriting] handle case where we've and optional inlined relation in the original query. Also, we should append EXISTS even in subquery to avoid inserting duplicates in results
"""Simple captcha library, based on PIL. Monkey patch functions in this module
if you want something better...
:organization: Logilab
:copyright: 2009-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
from random import randint, choice
from cStringIO import StringIO
import Image, ImageFont, ImageDraw, ImageFilter
from time import time
from cubicweb import tags
from cubicweb.web import formwidgets as fw
def pil_captcha(text, fontfile, fontsize):
"""Generate a captcha image. Return a PIL image object.
adapted from http://code.activestate.com/recipes/440588/
"""
# randomly select the foreground color
fgcolor = randint(0, 0xffff00)
# make the background color the opposite of fgcolor
bgcolor = fgcolor ^ 0xffffff
# create a font object
font = ImageFont.truetype(fontfile, fontsize)
# determine dimensions of the text
dim = font.getsize(text)
# create a new image slightly larger that the text
img = Image.new('RGB', (dim[0]+5, dim[1]+5), bgcolor)
draw = ImageDraw.Draw(img)
# draw 100 random colored boxes on the background
x, y = img.size
for num in xrange(100):
draw.rectangle((randint(0, x), randint(0, y),
randint(0, x), randint(0, y)),
fill=randint(0, 0xffffff))
# add the text to the image
draw.text((3, 3), text, font=font, fill=fgcolor)
img = img.filter(ImageFilter.EDGE_ENHANCE_MORE)
return img
def captcha(fontfile, fontsize, size=5, format='JPEG'):
"""Generate an arbitrary text, return it together with a buffer containing
the captcha image for the text
"""
text = u''.join(choice('QWERTYUOPASDFGHJKLZXCVBNM') for i in range(size))
img = pil_captcha(text, fontfile, fontsize)
out = StringIO()
img.save(out, format)
out.seek(0)
return text, out
class CaptchaWidget(fw.TextInput):
def render(self, form, field, renderer=None):
# t=int(time()*100) to make sure img is not cached
src = form._cw.build_url('view', vid='captcha', t=int(time()*100))
img = tags.img(src=src, alt=u'captcha')
img = u'<div class="captcha">%s</div>' % img
return img + super(CaptchaWidget, self).render(form, field, renderer)