app/soc/views/helper/decorators.py
author Sverre Rabbelier <srabbelier@gmail.com>
Sat, 24 Oct 2009 16:23:31 -0700
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parent 2990 0b6a093c5c81
permissions -rw-r--r--
GSoC Views
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#!/usr/bin/python2.5
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#
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# Copyright 2008 the Melange authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#   http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Views decorators.
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"""
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__authors__ = [
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  '"Pawel Solyga" <pawel.solyga@gmail.com>',
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  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
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  ]
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import logging
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from functools import wraps
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from django import http
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from django.utils.translation import ugettext
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from soc.logic import dicts
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from soc.views.helper import responses
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class Error(Exception):
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  """Base class for all exceptions raised by this module.
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  """
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  pass
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def view(func):
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  """Decorator that insists that exceptions are handled by view.
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  """
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  @wraps(func)
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  def view_wrapper(request, *args, **kwds):
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    """View decorator wrapper method.
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    """
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    return func(request, *args, **kwds)
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  return view_wrapper
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def merge_params(func):
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  """Decorator that merges 'params' with self._params.
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  """
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  @wraps(func)
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  def wrapper(self, *args, **kwargs):
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    """Decorator wrapper method.
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    """
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    params = kwargs.get('params', {})
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    kwargs['params'] = dicts.merge(params, self._params)
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    return func(self, *args, **kwargs)
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  return wrapper
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def check_access(func):
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  """This decorator does access checks for the specified view method.
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  The rights dictionary is extracted from 'params', or, if either 'params' or
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  'rights' do not exist, from self._params['rights'].
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  """
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  # Do not pollute helper.decorators with access specific imports
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  from soc.views import out_of_band
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  from soc.views import helper
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  from soc.views.helper import responses
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  @wraps(func)
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  def wrapper(self, request, access_type, *args, **kwargs):
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    """Decorator wrapper method.
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    """
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    params = kwargs.get('params', {})
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    # Try to extract rights
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    if 'rights' in params:
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      rights = params['rights']
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    else:
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      rights = self._params['rights']
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    check_kwargs = kwargs.copy()
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    context = responses.getUniversalContext(request)
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    responses.useJavaScript(context, self._params['js_uses_all'])
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    id = context['account']
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    user = context['user']
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    check_kwargs['GET'] = request.GET
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    check_kwargs['POST'] = request.POST
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    check_kwargs['context'] = context
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    # reset and pre-fill the Checker's cache
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    rights.setCurrentUser(id, user)
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    # Do the access check dance
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    try:
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      rights.checkAccess(access_type, check_kwargs)
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    except out_of_band.Error, error:
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      return helper.responses.errorResponse(error, request)
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    return func(self, request, access_type, *args, **kwargs)
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  return wrapper
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