def renderCaptcha(self, cpath='', solpath='', cname=None):
''' Generate one captcha set (captcha image + solution mask) '''
# == INIT
# Position the reference image (clickable model-only image) to the left or to the right? (this adds more complexity for bots)
rightorleft = random.random()
# Generate a random name, unless it was specified otherwise
if not cname:
cname = "%s" % self.randomID()
# Generating a 3D scene
w = self.world
w.generateScene()
# == GENERATING CAPTCHA SOLUTION MASK
# Render and save clickable mask
#w.renderClickableArea() # Already rendered just after the generation of the world
imgMask = w.renderToPNM()
if rightorleft < 0.5:
imgMask.expandBorder(left=imgMask.getReadXSize(), right=0, bottom=0, top=0, color=(0,0,0,1))
else:
imgMask.expandBorder(left=0, right=imgMask.getReadXSize(), bottom=0, top=0, color=(0,0,0,1))
# Save the solution mask as a PNG then RLE
# TODO find a way to convert from PNMImage to RLE directly in-memory without saving it to a file
pngpath = os.path.join(cpath, "%s.png" % cname)
imgMask.write(pngpath) # save image as png to avoid losing information (important since it's the solution mask!)
imgMask.clear() # freeing memory
#w.renderAndSave('testmask.png')
# Convert PNG to RLE
rle = RLEImage()
rle.convertImageToRLE(pngpath, os.path.join(cpath, "%s.rle" % cname))
del rle # freeing memory
if not self.debug and not self.debugPng:
os.remove(pngpath) # delete the png, not needed and it frees some space
# == GENERATING CAPTCHA QUESTION
# Render and save captcha image (the one that will be presented to the user)
# First we generate the whole captcha scene (where the user will have to click)
w.renderReset()
img1 = w.renderToPNM()
# Second, we generate the reference model alone so that the user know what he has to look for
w.renderClickableModel(self.showRefModel, self.showRefName)
img2 = w.renderToPNM()
# Place the reference image randomly at the right side or at the left side (to confuse bots a little bit more)
if rightorleft < 0.5:
img1.expandBorder(left=img2.getReadXSize(), right=0, bottom=0, top=0, color=(0,0,0,1)) # resizing the first image to the size of two images (reference image + whole scene image)
img1.copySubImage(img2, 0, 0) # copying reference image onto the first one, side by side
else:
img1.expandBorder(left=0, right=img2.getReadXSize(), bottom=0, top=0, color=(0,0,0,1))
img1.copySubImage(img2, img2.getReadXSize(), 0)
# Saving final image
# First step: we save the jpg image
jpgpath = os.path.join(solpath, "%s.jpg" % cname)
img1.write( jpgpath ) # save image (using jpg will add even more complexity for bots, because JPEG is a lossy image compression using psycho-human optimization: lossy + adapted to human = worst for bots) TODO: add a parameter to adjust the JPEG quality and loss
img2.clear() # freeing memory
img1.clear() # freeing memory
# Second step: reload the jpg in PIL and resave with a different quality (because Panda3D doesn't allow to set jpg quality)
# This is important: saving with a lower quality reduce bandwidth but also raise the difficulty for the bots
img = Image.open(jpgpath, 'r')
img.save(jpgpath, quality = self.jpgquality, optimize=False, progressive=True) # Optimize does an extra pass. Not needed here: we don't want to optimize for bots.
del img # freeing memory
if self.debug:
w.base.run() # if debug mode enabled, we show a window with the world we have just generated
return cname # return the ID of the generated captcha
def checkSolution(self, solpath, name, x, y):
''' Check if a Captcha response is correct '''
rle = RLEImage()
result = rle.openAndCheck( os.path.join(solpath, "%s.rle" % name) , x, y)
del rle
return result
