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""" Provides a set of pluggable permission policies. """ from django.http import Http404 from rest_framework import exceptions SAFE_METHODS = ('GET', 'HEAD', 'OPTIONS') class OperationHolderMixin: def __and__(self, other): return OperandHolder(AND, self, other) def __or__(self, other): return OperandHolder(OR, self, other) def __rand__(self, other): return OperandHolder(AND, other, self) def __ror__(self, other): return OperandHolder(OR, other, self) def __invert__(self): return SingleOperandHolder(NOT, self) class SingleOperandHolder(OperationHolderMixin): def __init__(self, operator_class, op1_class): self.operator_class = operator_class self.op1_class = op1_class def __call__(self, *args, **kwargs): op1 = self.op1_class(*args, **kwargs) return self.operator_class(op1) class OperandHolder(OperationHolderMixin): def __init__(self, operator_class, op1_class, op2_class): self.operator_class = operator_class self.op1_class = op1_class self.op2_class = op2_class def __call__(self, *args, **kwargs): op1 = self.op1_class(*args, **kwargs) op2 = self.op2_class(*args, **kwargs) return self.operator_class(op1, op2) class AND: def __init__(self, op1, op2): self.op1 = op1 self.op2 = op2 def has_permission(self, request, view): return ( self.op1.has_permission(request, view) and self.op2.has_permission(request, view) ) def has_object_permission(self, request, view, obj): return ( self.op1.has_object_permission(request, view, obj) and self.op2.has_object_permission(request, view, obj) ) class OR: def __init__(self, op1, op2): self.op1 = op1 self.op2 = op2 def has_permission(self, request, view): return ( self.op1.has_permission(request, view) or self.op2.has_permission(request, view) ) def has_object_permission(self, request, view, obj): return ( self.op1.has_object_permission(request, view, obj) or self.op2.has_object_permission(request, view, obj) ) class NOT: def __init__(self, op1): self.op1 = op1 def has_permission(self, request, view): return not self.op1.has_permission(request, view) def has_object_permission(self, request, view, obj): return not self.op1.has_object_permission(request, view, obj) class BasePermissionMetaclass(OperationHolderMixin, type): pass class BasePermission(metaclass=BasePermissionMetaclass): """ A base class from which all permission classes should inherit. """ def has_permission(self, request, view): """ Return `True` if permission is granted, `False` otherwise. """ return True def has_object_permission(self, request, view, obj): """ Return `True` if permission is granted, `False` otherwise. """ return True class AllowAny(BasePermission): """ Allow any access. This isn't strictly required, since you could use an empty permission_classes list, but it's useful because it makes the intention more explicit. """ def has_permission(self, request, view): return True class IsAuthenticated(BasePermission): """ Allows access only to authenticated users. """ def has_permission(self, request, view): return bool(request.user and request.user.is_authenticated) class IsAdminUser(BasePermission): """ Allows access only to admin users. """ def has_permission(self, request, view): return bool(request.user and request.user.is_staff) class IsAuthenticatedOrReadOnly(BasePermission): """ The request is authenticated as a user, or is a read-only request. """ def has_permission(self, request, view): return bool( request.method in SAFE_METHODS or request.user and request.user.is_authenticated ) 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 can only be applied against view classes that provide a `.queryset` attribute. """ # 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'], } authenticated_users_only = True 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.model_name } if method not in self.perms_map: raise exceptions.MethodNotAllowed(method) return [perm % kwargs for perm in self.perms_map[method]] def _queryset(self, view): assert hasattr(view, 'get_queryset') \ or getattr(view, 'queryset', None) is not None, ( 'Cannot apply {} on a view that does not set ' '`.queryset` or have a `.get_queryset()` method.' ).format(self.__class__.__name__) if hasattr(view, 'get_queryset'): queryset = view.get_queryset() assert queryset is not None, ( '{}.get_queryset() returned None'.format(view.__class__.__name__) ) return queryset return view.queryset def has_permission(self, request, view): # Workaround to ensure DjangoModelPermissions are not applied # to the root view when using DefaultRouter. if getattr(view, '_ignore_model_permissions', False): return True if not request.user or ( not request.user.is_authenticated and self.authenticated_users_only): return False queryset = self._queryset(view) perms = self.get_required_permissions(request.method, queryset.model) return request.user.has_perms(perms) class DjangoModelPermissionsOrAnonReadOnly(DjangoModelPermissions): """ Similar to DjangoModelPermissions, except that anonymous users are allowed read-only access. """ authenticated_users_only = False class DjangoObjectPermissions(DjangoModelPermissions): """ The request is authenticated using Django's object-level permissions. It requires an object-permissions-enabled backend, such as Django Guardian. It ensures that the user is authenticated, and has the appropriate `add`/`change`/`delete` permissions on the object using .has_perms. This permission can only be applied against view classes that provide a `.queryset` attribute. """ 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_object_permissions(self, method, model_cls): kwargs = { 'app_label': model_cls._meta.app_label, 'model_name': model_cls._meta.model_name } if method not in self.perms_map: raise exceptions.MethodNotAllowed(method) return [perm % kwargs for perm in self.perms_map[method]] def has_object_permission(self, request, view, obj): # authentication checks have already executed via has_permission queryset = self._queryset(view) model_cls = queryset.model user = request.user perms = self.get_required_object_permissions(request.method, model_cls) if not user.has_perms(perms, obj): # If the user does not have permissions we need to determine if # they have read permissions to see 403, or not, and simply see # a 404 response. if request.method in SAFE_METHODS: # Read permissions already checked and failed, no need # to make another lookup. raise Http404 read_perms = self.get_required_object_permissions('GET', model_cls) if not user.has_perms(read_perms, obj): raise Http404 # Has read permissions. return False return True