89 lines
2.9 KiB
Python
89 lines
2.9 KiB
Python
# Copyright The IETF Trust 2007, All Rights Reserved
|
|
|
|
from django.http import HttpResponsePermanentRedirect, Http404, BadHeaderError
|
|
from django.shortcuts import get_object_or_404
|
|
import re
|
|
|
|
from ietf.redirects.models import Redirect, Command
|
|
|
|
def redirect(request, path="", script=""):
|
|
if path:
|
|
script = path + "/" + script
|
|
redir = get_object_or_404(Redirect, cgi=script)
|
|
url = "/" + redir.url + "/"
|
|
(rest, remove) = (redir.rest, redir.remove)
|
|
remove_args = []
|
|
cmd = None
|
|
#
|
|
# First look for flag items, stored in the database
|
|
# as a command with a leading "^".
|
|
for flag in redir.commands.all().filter(command__startswith='^'):
|
|
fc = flag.command[1:].split("^")
|
|
if len(fc) > 1:
|
|
if request.REQUEST.get('command') != fc[1]:
|
|
continue
|
|
if request.REQUEST.has_key(fc[0]):
|
|
remove_args.append(fc[0])
|
|
num = re.match('(\d+)', request.REQUEST[fc[0]])
|
|
if (num and int(num.group(1))) or (num is None):
|
|
cmd = flag
|
|
break
|
|
#
|
|
# If that search didn't result in a match, then look
|
|
# for an exact match for the command= parameter.
|
|
if cmd is None:
|
|
try:
|
|
cmd = redir.commands.all().get(command=request.REQUEST['command'])
|
|
except Command.DoesNotExist:
|
|
pass # it's ok, there's no more-specific request.
|
|
except KeyError:
|
|
pass # it's ok, request didn't have 'command'.
|
|
except:
|
|
pass # strange exception like the one described in
|
|
# http://merlot.tools.ietf.org/tools/ietfdb/ticket/179 ?
|
|
# just ignore the command string.
|
|
if cmd is not None:
|
|
remove_args.append('command')
|
|
if cmd.url:
|
|
rest = cmd.url + "/"
|
|
else:
|
|
rest = ""
|
|
if cmd.suffix:
|
|
rest = rest + cmd.suffix.rest
|
|
remove = cmd.suffix.remove
|
|
else:
|
|
remove = ""
|
|
try:
|
|
# This throws exception (which gets caught below) if request
|
|
# contains non-ASCII characters. The old scripts didn't support
|
|
# non-ASCII characters anyway, so there's no need to handle
|
|
# them fully correctly in these redirects.
|
|
url += str(rest % request.REQUEST)
|
|
url += "/"
|
|
except:
|
|
# rest had something in it that request didn't have, so just
|
|
# redirect to the root of the tool.
|
|
pass
|
|
# Be generous in what you accept: collapse multiple slashes
|
|
url = re.sub(r'/+', '/', url)
|
|
if remove:
|
|
url = re.sub(re.escape(remove) + "/?$", "", url)
|
|
# If there is a dot in the last url segment, remove the
|
|
# trailing slash. This is basically the inverse of the
|
|
# APPEND_SLASH middleware.
|
|
if '/' in url and '.' in url.split('/')[-2]:
|
|
url = url.rstrip('/')
|
|
# Copy the GET arguments, remove all the ones we were
|
|
# expecting and if there are any left, add them to the URL.
|
|
get = request.GET.copy()
|
|
remove_args += re.findall(r'%\(([^)]+)\)', rest)
|
|
for arg in remove_args:
|
|
if get.has_key(arg):
|
|
get.pop(arg)
|
|
if get:
|
|
url += '?' + get.urlencode()
|
|
try:
|
|
return HttpResponsePermanentRedirect(url)
|
|
except BadHeaderError:
|
|
raise Http404
|