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104 | # Middleware
import hmac, sha, base64, os
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.http import HttpResponseRedirect, HttpResponse
from django.utils.translation import ugettext as _
class ProtectAntiRobotsMiddleware(object):
def process_request(self, request):
if request.get_full_path().startswith('/protectantirobots/'):
if request.get_full_path() == '/protectantirobots/img/':
s = base64.b64decode(request.session['protectantirobots_key'])
size = (100,30)
img = Image.new("RGB", size, "white")
draw = ImageDraw.Draw(img)
font = ImageFont.truetype(os.path.dirname(__file__)+"/FreeSansBold.ttf", 24)
draw.text((2,2), s, fill="red", font=font)
draw.line((0, 0) + img.size, fill=128)
draw.line((0, img.size[1], img.size[0], 0), fill=128)
del draw
ret = HttpResponse(mimetype='image/gif')
img.save(ret, "GIF")
return ret
elif 'k' in request.GET:
if request.POST:
n = request.POST['n']
sec = base64.b64decode(request.session['protectantirobots_key'])
if n == sec:
request.session['protectantirobots_sec'] = sec
return HttpResponseRedirect(request.session['protectantirobots_referer'])
return render_to_response(
'protectantirobots.html',
{'msg': _('Invalid number!')},
context_instance=RequestContext(request),
)
else:
request.session['protectantirobots_key'] = request.REQUEST['k']
request.session['protectantirobots_referer'] = request.META.get('HTTP_REFERER', '')
return render_to_response(
'protectantirobots.html',
locals(),
context_instance=RequestContext(request),
)
# Template tag
import base64
from datetime import datetime, timedelta
from django.template import Library, Node
from django.utils.translation import ugettext as _
class ProtectAntiRobotsNode(Node):
nodelist = ''
def __init__(self, nodelist):
super(ProtectAntiRobotsNode, self).__init__()
self.nodelist = nodelist
def __repr__(self):
return "<ProtectAntiRobotsNode>"
def render(self, context):
request = context['request']
if 'protectantirobots_sec' in request.session and \
'protectantirobots_key' in request.session:
if request.session['protectantirobots_sec'] == base64.b64decode(request.session['protectantirobots_key']):
output = self.nodelist.render(context)
return output
sec = base64.b64encode(datetime.now().strftime("%H%m%S"))
return '<a href="%s">%s</a>' %(self.get_url(sec), _('Let us know if you are human'))
def get_url(self, sec):
return "/protectantirobots/?k=" + sec
def do_protectantirobots(parser, token):
nodelist = parser.parse(('endprotectantirobots',))
parser.delete_first_token()
return ProtectAntiRobotsNode(nodelist)
do_protectantirobots= register.tag('protectantirobots', do_protectantirobots)
# Template (protectantirobots.html file) - you can change layout and other things
<html>
<body>
What number is this?
<form method="post">
<img src="/protectantirobots/img/"/>
<input name="n"/>
<input type="submit"/>
</form>
{% if msg %}
<strong>{{ msg }}</strong>
{% endif %}
</body>
</html>
|
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Fixed line 65 (not subscriptable request object)
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