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"""
The :mod:`permissions` module bundles a set of permission classes that are used
for checking if a request passes a certain set of constraints.
Permission behavior is provided by mixing the :class:`mixins.PermissionsMixin` class into a :class:`View` class.
"""
SAFE_METHODS = ['GET', 'HEAD', 'OPTIONS']
class BasePermission(object):
"""
A base class from which all permission classes should inherit.
"""
def __init__(self, view):
"""
Permission classes are always passed the current view on creation.
"""
self.view = view
def has_permission(self, request, obj=None):
"""
Should simply return, or raise an :exc:`response.ImmediateResponse`.
"""
raise NotImplementedError(".has_permission() must be overridden.")
class IsAuthenticated(BasePermission):
"""
Allows access only to authenticated users.
"""
def has_permission(self, request, obj=None):
if request.user and request.user.is_authenticated():
return True
return False
class IsAdminUser(BasePermission):
"""
Allows access only to admin users.
"""
def has_permission(self, request, obj=None):
if request.user and request.user.is_staff:
return True
return False
class IsAuthenticatedOrReadOnly(BasePermission):
"""
The request is authenticated as a user, or is a read-only request.
"""
def has_permission(self, request, obj=None):
if (request.method in SAFE_METHODS or
request.user and
request.user.is_authenticated()):
return True
return False
class DjangoModelPermissions(BasePermission):
"""
The request is authenticated using `django.contrib.auth` permissions.
See: https://docs.djangoproject.com/en/dev/topics/auth/#permissions
It ensures that the user is authenticated, and has the appropriate
`add`/`change`/`delete` permissions on the model.
This permission should only be used on views with a `ModelResource`.
"""
# Map methods into required permission codes.
# Override this if you need to also provide 'view' permissions,
# or if you want to provide custom permission codes.
perms_map = {
'GET': [],
'OPTIONS': [],
'HEAD': [],
'POST': ['%(app_label)s.add_%(model_name)s'],
'PUT': ['%(app_label)s.change_%(model_name)s'],
'PATCH': ['%(app_label)s.change_%(model_name)s'],
'DELETE': ['%(app_label)s.delete_%(model_name)s'],
}
def get_required_permissions(self, method, model_cls):
"""
Given a model and an HTTP method, return the list of permission
codes that the user is required to have.
"""
kwargs = {
'app_label': model_cls._meta.app_label,
'model_name': model_cls._meta.module_name
}
return [perm % kwargs for perm in self.perms_map[method]]
def has_permission(self, request, obj=None):
model_cls = self.view.model
perms = self.get_required_permissions(request.method, model_cls)
if (request.user and
request.user.is_authenticated() and
request.user.has_perms(perms, obj)):
return True
return False
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