Fix (de)serialization of ComputedRelation read permissions
For normal relation types, permissions don't need to be stored since
they're just default values for the relation definitions. However,
computed relations are serialized (as CWComputedRType), while their
relation definitions are added at schema finalization time, and are only
in memory. So add the 'read_permission' relation to CWComputedRType,
and the appropriate hooks to save and restore those permissions.
To avoid having to touch yams, we drop the 'add' and 'delete'
permissions from the default computed relation permissions; this should
probably be backported there. The actual permissions (set on the
relation definitions) are hardcoded in finalize_computed_relations
anyway.
In deserialize_schema, the CWComputedRType handling needs to be delayed
a little bit, until after we've called deserialize_ertype_permissions.
The rql2sql test is adjusted because CWComputedRType has a 'name'
attribute and the 'read_permission' relation, which generates ambiguity
vs CWEType.
We add an explicit CubicWebRelationSchema.check_permission_definitions,
since we need to check both that computed and non-computed rtypes are
defined properly.
Based on report and initial patch from Christophe de Vienne (thanks!).
Closes #5706307
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#
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# any later version.
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
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# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""Simple captcha library, based on PIL. Monkey patch functions in this module
if you want something better...
"""
__docformat__ = "restructuredtext en"
from random import randint, choice
from cStringIO import StringIO
from PIL import Image, ImageFont, ImageDraw, ImageFilter
from time import time
from cubicweb import tags
from cubicweb.web import ProcessFormError, 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),
captchakey=field.input_name(form))
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)
def process_field_data(self, form, field):
captcha = form._cw.session.data.pop(field.input_name(form), None)
val = super(CaptchaWidget, self).process_field_data(form, field)
if val is None:
return val # required will be checked by field
if captcha is None:
msg = form._cw._('unable to check captcha, please try again')
raise ProcessFormError(msg)
elif val.lower() != captcha.lower():
msg = form._cw._('incorrect captcha value')
raise ProcessFormError(msg)
return val