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CAPTCHA EN 3D ISOMETRIQUE


Information sur la source



Description

c'est un portage de ce captcha :

exlplications et demo (de la version php) ici : http://eelte.megami.fr/
http://www.phpcs.com/codes/CAPTCHA-3D-ISO-LECTURE-FONT-CONSOLE_45049.aspx

cette source n'est pas de moi, elle est de Pierre Bourdon (alias delroth), il a fait une simple traduction de mon code, de php vers python.
 

Source

  • #!/usr/bin/env python
  • #-*- encoding: utf-8 -*-
  • #
  • # captcha.py
  • # Library to simply use captchas.
  • #
  • # Copyright (c) 2008 Pierre "delroth" Bourdon <root@delroth.is-a-geek.org>
  • #
  • # This program is free software: you can redistribute it and/or modify
  • # it under the terms of the GNU General Public License as published by
  • # the Free Software Foundation, either version 3 of the License, or
  • # (at your option) any later version.
  • #
  • # This program is distributed in the hope that it will be useful,
  • # but WITHOUT ANY WARRANTY; without even the implied warranty of
  • # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  • # GNU General Public License for more details.
  • #
  • # You should have received a copy of the GNU General Public License
  • # along with this program. If not, see <http://www.gnu.org/licenses/>.
  • # Original PHP code from coucou747 ( http://eelte.megami.fr ), translated into Python.
  • import math
  • import random
  • import sys
  • import cgitb
  • from PIL import Image, ImageDraw
  • cgitb.enable()
  • class Captcha(object):
  • """
  • A captcha object is used to encapsulate a text and render the image
  • with this text, which will generally be randomized.
  • """
  • def randomString(self):
  • """
  • Returns a random string to use in the captcha, with the most readable
  • characters.
  • """
  • out = ''
  • for i in xrange(self.len):
  • out += random.choice(self.charset)
  • return out
  • def getMatrix(self):
  • """
  • Returns the deformation matrix.
  • """
  • lim_x = 16 * (len(self.text) + 1)
  • array = []
  • """
  • on place les vagues sur la matrice
  • """
  • for k in xrange(20):
  • array.append([])
  • for i in xrange(lim_x):
  • array[k].append(math.cos((i * self.cy + k * self.cx * math.pi)
  • * self.cangle + self.phy) *
  • math.sin((i * self.cy + k * self.cx * math.pi)
  • * self.cangle + self.phy) * self.h2 * 7)
  • """
  • update function
  • """
  • def e(x, y): array[x][y] -= 2 * self.h
  • """
  • mise a jours de la matrice, pour afficher le texte
  • """
  • for k in xrange(1, len(self.text) + 1):
  • for i in xrange(8):
  • for j in xrange(7, -1, -1):
  • if ord(self.alphabet[i + 4 + ord(self.text[k - 1]) * 8]) & (1 << j):
  • e(i * 2 + 2, k * 16 + 9 - j * 2)
  • e(i * 2 + 3, k * 16 + 9 - j * 2)
  • e(i * 2 + 2, k * 16 + 10 - j * 2)
  • e(i * 2 + 3, k * 16 + 10 - j * 2)
  • return array
  • def getColor(self, matrix, color):
  • return color * (10 - matrix / 3) / 10
  • def drawMatrix(self, matrix, image):
  • """
  • Draws the matrix on the image.
  • """
  • drawer = ImageDraw.Draw(image)
  • s, c = math.sin(self.angle), math.cos(self.angle)
  • lx, ly = len(matrix[0]) - 1, len(matrix) - 1
  • dx, dy, by = self.dx, self.dy, self.by
  • a = matrix
  • for y in xrange(ly):
  • for x in xrange(lx):
  • drawer.polygon([((x + y * c) * dx, by + a[y][x] + (y + x * s) * dy),
  • ((x + (1 + y) * c) * dx, by + a[y + 1][x] + (y + 1 + x * s) * dy),
  • ((x + 1 + (y + 1) * c) * dx, by + a[y + 1][x + 1] + (y + 1 + (x + 1) * s) * dy),
  • (((x + 1) + y * c) * dx, by + a[y][x + 1] + (y + (x + 1) * s) * dy)],
  • outline=self.color, fill=self.background)
  • del drawer
  • def getImage(self):
  • sizex = self.width
  • sizey = self.height
  • img = Image.new("RGBA", (sizex, sizey), self.background)
  • self.drawMatrix(self.matrix, img)
  • return img
  • def loadAlphabet(self):
  • return file(self.alphaf).read()
  • """
  • ces variables devraient etres aleatoires
  • """
  • def __init__(self, alphaf, charset="bcdefghijklmnopqrstuvwxyz", len=5, width=450, height=160, color=(0, 0, 0, 255), background=(255, 255, 255, 0), angle=-5*3.1415/200, dx=4, dy=6, by=40, h=8, h2=2, cangle=0.055, cx=1.5, cy=1, phy=2):
  • l = locals()
  • for k in l:
  • if k == 'self': continue
  • setattr(self, k, l[k])
  • self.alphabet = self.loadAlphabet()
  • self.text = self.randomString()
  • self.matrix = self.getMatrix()
  • print 'Content-Type: image/png'
  • print
  • if __name__ == '__main__':
  • c = Captcha('alt-8x8.psf', color=(0, 0, 255, 255), background=(255, 255, 255, 255))
  • c.getImage().save(sys.stdout, 'png')
#!/usr/bin/env python
#-*- encoding: utf-8 -*-
#
# captcha.py
# Library to simply use captchas.
#
# Copyright (c) 2008 Pierre "delroth" Bourdon <root@delroth.is-a-geek.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Original PHP code from coucou747 ( http://eelte.megami.fr ), translated into Python.

import math
import random
import sys
import cgitb
from PIL import Image, ImageDraw

cgitb.enable()

class Captcha(object):
    """
    A captcha object is used to encapsulate a text and render the image
    with this text, which will generally be randomized.
    """

    def randomString(self):
        """
        Returns a random string to use in the captcha, with the most readable
        characters.
        """
        out = ''
        for i in xrange(self.len):
            out += random.choice(self.charset)
        return out

    def getMatrix(self):
        """
        Returns the deformation matrix.
        """
        lim_x = 16 * (len(self.text) + 1)
        array = []
        """
        on place les vagues sur la matrice
        """
        for k in xrange(20):
            array.append([])
            for i in xrange(lim_x):
                array[k].append(math.cos((i * self.cy + k * self.cx * math.pi)
                                         * self.cangle + self.phy) *
                                math.sin((i * self.cy + k * self.cx * math.pi)
                                         * self.cangle + self.phy) * self.h2 * 7)
        """
        update function
        """
        def e(x, y): array[x][y] -= 2 * self.h
        """
        mise a jours de la matrice, pour afficher le texte
        """
        for k in xrange(1, len(self.text) + 1):
            for i in xrange(8):
                for j in xrange(7, -1, -1):
                    if ord(self.alphabet[i + 4 + ord(self.text[k - 1]) * 8]) & (1 << j):
                        e(i * 2 + 2, k * 16 + 9 - j * 2)
                        e(i * 2 + 3, k * 16 + 9 - j * 2)
                        e(i * 2 + 2, k * 16 + 10 - j * 2)
                        e(i * 2 + 3, k * 16 + 10 - j * 2)

        return array

    def getColor(self, matrix, color):
        return color * (10 - matrix / 3) / 10

    def drawMatrix(self, matrix, image):
        """
        Draws the matrix on the image.
        """
        drawer = ImageDraw.Draw(image)
        s, c = math.sin(self.angle), math.cos(self.angle)
        lx, ly = len(matrix[0]) - 1, len(matrix) - 1
        dx, dy, by = self.dx, self.dy, self.by
        a = matrix

        for y in xrange(ly):
            for x in xrange(lx):
                drawer.polygon([((x + y * c) * dx, by + a[y][x] + (y + x * s) * dy),
                                ((x + (1 + y) * c) * dx, by + a[y + 1][x] + (y + 1 + x * s) * dy),
                                ((x + 1 + (y + 1) * c) * dx, by + a[y + 1][x + 1] + (y + 1 + (x + 1) * s) * dy),
                                (((x + 1) + y * c) * dx, by + a[y][x + 1] + (y + (x + 1) * s) * dy)],
                                outline=self.color, fill=self.background)
        del drawer

    def getImage(self):
        sizex = self.width
        sizey = self.height
        img = Image.new("RGBA", (sizex, sizey), self.background)
        self.drawMatrix(self.matrix, img)
        return img
    
    def loadAlphabet(self):
        return file(self.alphaf).read()
    """
    ces variables devraient etres aleatoires
    """
    def __init__(self, alphaf, charset="bcdefghijklmnopqrstuvwxyz", len=5, width=450, height=160, color=(0, 0, 0, 255), background=(255, 255, 255, 0), angle=-5*3.1415/200, dx=4, dy=6, by=40, h=8, h2=2, cangle=0.055, cx=1.5, cy=1, phy=2):
        l = locals()
        for k in l:
            if k == 'self': continue
            setattr(self, k, l[k])
        self.alphabet = self.loadAlphabet()
        self.text = self.randomString()
        self.matrix = self.getMatrix()

print 'Content-Type: image/png'
print

if __name__ == '__main__':
    c = Captcha('alt-8x8.psf', color=(0, 0, 255, 255), background=(255, 255, 255, 255))
    c.getImage().save(sys.stdout, 'png')

Conclusion

ce code se lance comme un cgi sur une page web.
 

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Développement réalisé par Nicolas SOREL (Nix) avec l'aide de : Cyril DURAND et Emmanuel BAÏSE, Merci à Vincent pour ses précieux conseils
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