django-cas-server/cas_server/utils.py

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# ⁻*- coding: utf-8 -*-
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# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License version 3 for
# more details.
#
# You should have received a copy of the GNU General Public License version 3
# along with this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# (c) 2015 Valentin Samir
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"""Some util function for the app"""
from .default_settings import settings
from django.utils.importlib import import_module
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from django.core.urlresolvers import reverse
from django.http import HttpResponseRedirect
import random
import string
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try:
from urlparse import urlparse, urlunparse, parse_qsl
from urllib import urlencode
except ImportError:
from urllib.parse import urlparse, urlunparse, parse_qsl, urlencode
def import_attr(path):
"""transform a python module.attr path to the attr"""
if not isinstance(path, str):
return string
module, attr = path.rsplit('.', 1)
return getattr(import_module(module), attr)
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def redirect_params(url_name, params=None):
"""Redirect to `url_name` with `params` as querystring"""
url = reverse(url_name)
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params = urlencode(params if params else {})
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return HttpResponseRedirect(url + "?%s" % params)
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def update_url(url, params):
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"""update params in the `url` query string"""
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if not isinstance(url, bytes):
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url = url.encode('utf-8')
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for key, value in list(params.items()):
if not isinstance(key, bytes):
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del params[key]
key = key.encode('utf-8')
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if not isinstance(value, bytes):
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value = value.encode('utf-8')
params[key] = value
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url_parts = list(urlparse(url))
query = dict(parse_qsl(url_parts[4]))
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query.update(params)
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url_parts[4] = urlencode(query)
for i in range(len(url_parts)):
if not isinstance(url_parts[i], bytes):
url_parts[i] = url_parts[i].encode('utf-8')
return urlunparse(url_parts).decode('utf-8')
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def unpack_nested_exception(error):
"""If exception are stacked, return the first one"""
i = 0
while True:
if error.args[i:]:
if isinstance(error.args[i], Exception):
error = error.args[i]
i = 0
else:
i += 1
else:
break
return error
def _gen_ticket(prefix, lg=settings.CAS_TICKET_LEN):
"""Generate a ticket with prefix `prefix`"""
return '%s-%s' % (
prefix,
''.join(
random.choice(
string.ascii_letters + string.digits
) for _ in range(lg - len(prefix) - 1)
)
)
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def gen_lt():
"""Generate a Service Ticket"""
return _gen_ticket(settings.CAS_LOGIN_TICKET_PREFIX, settings.CAS_LT_LEN)
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def gen_st():
"""Generate a Service Ticket"""
return _gen_ticket(settings.CAS_SERVICE_TICKET_PREFIX, settings.CAS_ST_LEN)
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def gen_pt():
"""Generate a Proxy Ticket"""
return _gen_ticket(settings.CAS_PROXY_TICKET_PREFIX, settings.CAS_PT_LEN)
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def gen_pgt():
"""Generate a Proxy Granting Ticket"""
return _gen_ticket(settings.CAS_PROXY_GRANTING_TICKET_PREFIX, settings.CAS_PGT_LEN)
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def gen_pgtiou():
"""Generate a Proxy Granting Ticket IOU"""
return _gen_ticket(settings.CAS_PROXY_GRANTING_TICKET_IOU_PREFIX, settings.CAS_PGTIOU_LEN)
def gen_saml_id():
"""Generate an saml id"""
return _gen_ticket('_')