Synnefo

# Copyright 2012, 2013 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from django.core import urlresolvers

from django.views.decorators import csrf

from django.conf.urls import patterns

def _patch_pattern(regex_pattern):

    """

    Patch pattern callback using csrf_exempt. Enforce

    RegexURLPattern callback to get resolved if required.

    """

    regex_pattern._callback = \

        csrf.csrf_exempt(regex_pattern.callback)

def _patch_resolver(r):

    """

    Patch all patterns found in resolver with _patch_pattern

    """

    if hasattr(r, 'url_patterns'):

        entries = r.url_patterns

    else:

        # first level view in patterns ?

        entries = [r]

    for entry in entries:

        if isinstance(entry, urlresolvers.RegexURLResolver):

            _patch_resolver(entry)

        #if isinstance(entry, urlresolvers.RegexURLPattern):

        # let it break...

        else:

            _patch_pattern(entry)

def api_patterns(*args, **kwargs):

    """

    Protect all url patterns from csrf attacks.

    """

    _patterns = patterns(*args, **kwargs)

    for entry in _patterns:

        _patch_resolver(entry)

    return _patterns