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import random
from django.urls import reverse
from captcha.conf import settings
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 (
"{}=".format(challenge.replace("*", settings.CAPTCHA_MATH_CHALLENGE_OPERATOR)),
str(eval(challenge)),
)
def random_char_challenge():
chars, ret = "abcdefghijklmnopqrstuvwxyz", ""
for i in range(settings.CAPTCHA_LENGTH):
ret += random.choice(chars)
return ret.upper(), ret
def unicode_challenge():
chars, ret = "äàáëéèïíîöóòüúù", ""
for i in range(settings.CAPTCHA_LENGTH):
ret += random.choice(chars)
return ret.upper(), ret
def word_challenge():
fd = open(settings.CAPTCHA_WORDS_DICTIONARY, "r")
lines = fd.readlines()
fd.close()
while True:
word = random.choice(lines).strip()
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 = open(settings.CAPTCHA_WORDS_DICTIONARY, "rb")
lines = fd.readlines()
fd.close()
word = ""
while True:
word1 = random.choice(lines).strip()
word2 = random.choice(lines).strip()
punct = random.choice(settings.CAPTCHA_PUNCTUATION)
word = "%s%s%s" % (word1, punct, word2)
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 noise_null(draw, image):
return draw
def random_letter_color_challenge(idx, plaintext_captcha):
# Generate colorful but balanced RGB values
red = random.randint(64, 150)
green = random.randint(64, 150)
blue = random.randint(64, 150)
# Ensure at least one channel is higher to make it colorful
channels = [red, green, blue]
channels[0] = random.randint(150, 255)
random.shuffle(channels)
# Format the color as a hex string
return f"#{channels[0]:02X}{channels[1]:02X}{channels[2]:02X}"
def post_smooth(image):
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])
def captcha_audio_url(key):
"""Return url to image. Need for ajax refresh and, etc"""
return reverse("captcha-audio", args=[key])
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