src/chrome/common/extensions/docs/server2/permissions_data_source.py

   1 # Copyright 2013 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 from itertools import ifilter
   6 from operator import itemgetter
   7
   8 from data_source import DataSource
   9 from extensions_paths import PRIVATE_TEMPLATES
  10 import features_utility as features
  11 from future import Gettable, Future
  12
  13
  14 def _ListifyPermissions(permissions):
  15   '''Filter out any permissions that do not have a description or with a name
  16   that ends with Private then sort permissions features by name into a list.
  17   '''
  18   def filter_permissions(perm):
  19     return 'description' in perm and not perm['name'].endswith('Private')
  20
  21   return sorted(
  22       ifilter(filter_permissions, permissions.values()),
  23       key=itemgetter('name'))
  24
  25
  26 def _AddDependencyDescriptions(permissions, api_features):
  27   '''Use |api_features| to determine the dependencies APIs have on permissions.
  28   Add descriptions to |permissions| based on those dependencies.
  29   '''
  30   for name, permission in permissions.iteritems():
  31     # Don't overwrite the description created by expanding a partial template.
  32     if 'partial' in permission or not permission['platforms']:
  33       continue
  34
  35     has_deps = False
  36     if name in api_features:
  37       for dependency in api_features[name].get('dependencies', ()):
  38         if dependency.startswith('permission:'):
  39           has_deps = True
  40
  41     if has_deps:
  42       permission['partial'] = 'permissions/generic_description.html'
  43
  44 class PermissionsDataSource(DataSource):
  45   '''Load and format permissions features to be used by templates.
  46   '''
  47   def __init__(self, server_instance, request):
  48     self._features_bundle = server_instance.features_bundle
  49     self._object_store = server_instance.object_store_creator.Create(
  50         PermissionsDataSource)
  51     self._template_cache = server_instance.compiled_fs_factory.ForTemplates(
  52         server_instance.host_file_system_provider.GetTrunk())
  53
  54   def _CreatePermissionsData(self):
  55     api_features_future = self._features_bundle.GetAPIFeatures()
  56     permission_features_future = self._features_bundle.GetPermissionFeatures()
  57     def resolve():
  58       permission_features = permission_features_future.Get()
  59       _AddDependencyDescriptions(permission_features, api_features_future.Get())
  60
  61       # Turn partial templates into descriptions, ensure anchors are set.
  62       for permission in permission_features.values():
  63         if not 'anchor' in permission:
  64           permission['anchor'] = permission['name']
  65         if 'partial' in permission:
  66           permission['description'] = self._template_cache.GetFromFile('%s/%s' %
  67               (PRIVATE_TEMPLATES, permission['partial'])).Get()
  68           del permission['partial']
  69
  70       def filter_for_platform(permissions, platform):
  71         return _ListifyPermissions(features.Filtered(permissions, platform))
  72       return {
  73         'declare_apps': filter_for_platform(permission_features, 'apps'),
  74         'declare_extensions': filter_for_platform(
  75             permission_features, 'extensions')
  76       }
  77     return Future(delegate=Gettable(resolve))
  78
  79   def _GetCachedPermissionsData(self):
  80     data = self._object_store.Get('permissions_data').Get()
  81     if data is None:
  82       data = self._CreatePermissionsData().Get()
  83       self._object_store.Set('permissions_data', data)
  84     return data
  85
  86   def Cron(self):
  87     return self._CreatePermissionsData()
  88
  89   def get(self, key):
  90     return self._GetCachedPermissionsData().get(key)