/usr/lib/python2.7/dist-packages/captcha/views.py is in python-django-captcha 0.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | from captcha.conf import settings
from captcha.helpers import captcha_image_url
from captcha.models import CaptchaStore
from django.http import HttpResponse, Http404
from django.core.exceptions import ImproperlyConfigured
import random
import re
import tempfile
import os
import subprocess
import six
try:
from cStringIO import StringIO
except ImportError:
from io import BytesIO as StringIO
try:
from PIL import Image, ImageDraw, ImageFont
except ImportError:
import Image
import ImageDraw
import ImageFont
try:
import json
except ImportError:
from django.utils import simplejson as json
NON_DIGITS_RX = re.compile('[^\d]')
# Distance of the drawn text from the top of the captcha image
from_top = 4
def getsize(font, text):
if hasattr(font, 'getoffset'):
return [x + y for x, y in zip(font.getsize(text), font.getoffset(text))]
else:
return font.getsize(text)
def makeimg(size):
if settings.CAPTCHA_BACKGROUND_COLOR == "transparent":
image = Image.new('RGBA', size)
else:
image = Image.new('RGB', size, settings.CAPTCHA_BACKGROUND_COLOR)
return image
def captcha_image(request, key, scale=1):
try:
store = CaptchaStore.objects.get(hashkey=key)
except CaptchaStore.DoesNotExist:
# HTTP 410 Gone status so that crawlers don't index these expired urls.
return HttpResponse(status=410)
text = store.challenge
if isinstance(settings.CAPTCHA_FONT_PATH, six.string_types):
fontpath = settings.CAPTCHA_FONT_PATH
elif isinstance(settings.CAPTCHA_FONT_PATH, (list, tuple)):
fontpath = random.choice(settings.CAPTCHA_FONT_PATH)
else:
raise ImproperlyConfigured('settings.CAPTCHA_FONT_PATH needs to be a path to a font or list of paths to fonts')
if fontpath.lower().strip().endswith('ttf'):
font = ImageFont.truetype(fontpath, settings.CAPTCHA_FONT_SIZE * scale)
else:
font = ImageFont.load(fontpath)
if settings.CAPTCHA_IMAGE_SIZE:
size = settings.CAPTCHA_IMAGE_SIZE
else:
size = getsize(font, text)
size = (size[0] * 2, int(size[1] * 1.4))
image = makeimg(size)
try:
PIL_VERSION = int(NON_DIGITS_RX.sub('', Image.VERSION))
except:
PIL_VERSION = 116
xpos = 2
charlist = []
for char in text:
if char in settings.CAPTCHA_PUNCTUATION and len(charlist) >= 1:
charlist[-1] += char
else:
charlist.append(char)
for char in charlist:
fgimage = Image.new('RGB', size, settings.CAPTCHA_FOREGROUND_COLOR)
charimage = Image.new('L', getsize(font, ' %s ' % char), '#000000')
chardraw = ImageDraw.Draw(charimage)
chardraw.text((0, 0), ' %s ' % char, font=font, fill='#ffffff')
if settings.CAPTCHA_LETTER_ROTATION:
if PIL_VERSION >= 116:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), expand=0, resample=Image.BICUBIC)
else:
charimage = charimage.rotate(random.randrange(*settings.CAPTCHA_LETTER_ROTATION), resample=Image.BICUBIC)
charimage = charimage.crop(charimage.getbbox())
maskimage = Image.new('L', size)
maskimage.paste(charimage, (xpos, from_top, xpos + charimage.size[0], from_top + charimage.size[1]))
size = maskimage.size
image = Image.composite(fgimage, image, maskimage)
xpos = xpos + 2 + charimage.size[0]
if settings.CAPTCHA_IMAGE_SIZE:
# centering captcha on the image
tmpimg = makeimg(size)
tmpimg.paste(image, (int((size[0] - xpos) / 2), int((size[1] - charimage.size[1]) / 2 - from_top)))
image = tmpimg.crop((0, 0, size[0], size[1]))
else:
image = image.crop((0, 0, xpos + 1, size[1]))
draw = ImageDraw.Draw(image)
for f in settings.noise_functions():
draw = f(draw, image)
for f in settings.filter_functions():
image = f(image)
out = StringIO()
image.save(out, "PNG")
out.seek(0)
response = HttpResponse(content_type='image/png')
response.write(out.read())
response['Content-length'] = out.tell()
return response
def captcha_audio(request, key):
if settings.CAPTCHA_FLITE_PATH:
try:
store = CaptchaStore.objects.get(hashkey=key)
except CaptchaStore.DoesNotExist:
# HTTP 410 Gone status so that crawlers don't index these expired urls.
return HttpResponse(status=410)
text = store.challenge
if 'captcha.helpers.math_challenge' == settings.CAPTCHA_CHALLENGE_FUNCT:
text = text.replace('*', 'times').replace('-', 'minus')
else:
text = ', '.join(list(text))
path = str(os.path.join(tempfile.gettempdir(), '%s.wav' % key))
subprocess.call([settings.CAPTCHA_FLITE_PATH, "-t", text, "-o", path])
if os.path.isfile(path):
response = HttpResponse()
f = open(path, 'rb')
response['Content-Type'] = 'audio/x-wav'
response.write(f.read())
f.close()
os.unlink(path)
return response
raise Http404
def captcha_refresh(request):
""" Return json with new captcha for ajax refresh request """
if not request.is_ajax():
raise Http404
new_key = CaptchaStore.generate_key()
to_json_response = {
'key': new_key,
'image_url': captcha_image_url(new_key),
}
return HttpResponse(json.dumps(to_json_response), content_type='application/json')
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