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# -*- coding: utf-8 -*- 

import random 

from captcha.conf import settings 

from django.core.urlresolvers import reverse 

 

 

def math_challenge(): 

    operators = ('+', '*', '-',) 

    operands = (random.randint(1, 10), random.randint(1, 10)) 

    operator = random.choice(operators) 

    if operands[0] < operands[1] and '-' == operator: 

        operands = (operands[1], operands[0]) 

    challenge = '%d%s%d' % (operands[0], operator, operands[1]) 

    return '%s=' % (challenge), eval(challenge) 

 

 

def random_char_challenge(): 

    chars, ret = u'abcdefghijklmnopqrstuvwxyz', u'' 

    for i in range(settings.CAPTCHA_LENGTH): 

        ret += random.choice(chars) 

    return ret.upper(), ret 

 

 

def unicode_challenge(): 

    chars, ret = u'äàáëéèïíîöóòüúù', u'' 

    for i in range(settings.CAPTCHA_LENGTH): 

        ret += random.choice(chars) 

    return ret.upper(), ret 

 

 

def word_challenge(): 

    fd = file(settings.CAPTCHA_WORDS_DICTIONARY, 'rb') 

    l = fd.readlines() 

    fd.close() 

    while True: 

        word = random.choice(l).strip() 

35        if len(word) >= settings.CAPTCHA_DICTIONARY_MIN_LENGTH and len(word) <= settings.CAPTCHA_DICTIONARY_MAX_LENGTH: 

            break 

    return word.upper(), word.lower() 

 

 

def huge_words_and_punctuation_challenge(): 

    "Yay, undocumneted. Mostly used to test Issue 39 - http://code.google.com/p/django-simple-captcha/issues/detail?id=39" 

    fd = file(settings.CAPTCHA_WORDS_DICTIONARY, 'rb') 

    l = fd.readlines() 

    fd.close() 

    word = '' 

    while True: 

        word1 = random.choice(l).strip() 

        word2 = random.choice(l).strip() 

        punct = random.choice(settings.CAPTCHA_PUNCTUATION) 

        word = '%s%s%s' % (word1, punct, word2) 

48        if len(word) >= settings.CAPTCHA_DICTIONARY_MIN_LENGTH and len(word) <= settings.CAPTCHA_DICTIONARY_MAX_LENGTH: 

            break 

    return word.upper(), word.lower() 

 

 

def noise_arcs(draw, image): 

    size = image.size 

    draw.arc([-20, -20, size[0], 20], 0, 295, fill=settings.CAPTCHA_FOREGROUND_COLOR) 

    draw.line([-20, 20, size[0] + 20, size[1] - 20], fill=settings.CAPTCHA_FOREGROUND_COLOR) 

    draw.line([-20, 0, size[0] + 20, size[1]], fill=settings.CAPTCHA_FOREGROUND_COLOR) 

    return draw 

 

 

def noise_dots(draw, image): 

    size = image.size 

    for p in range(int(size[0] * size[1] * 0.1)): 

        draw.point((random.randint(0, size[0]), random.randint(0, size[1])), fill=settings.CAPTCHA_FOREGROUND_COLOR) 

    return draw 

 

 

def post_smooth(image): 

    try: 

        import ImageFilter 

    except ImportError: 

        from PIL import ImageFilter 

    return image.filter(ImageFilter.SMOOTH) 

 

 

def captcha_image_url(key): 

    """ Return url to image. Need for ajax refresh and, etc""" 

    return reverse('captcha-image', args=[key])