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69dcf13da9
Turns out that Django's default permissions backend always returns False when checking object-level permissions, even if the user does have valid global permissions.
115 lines
3.3 KiB
Python
115 lines
3.3 KiB
Python
"""
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Provides a set of pluggable permission policies.
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"""
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from __future__ import unicode_literals
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SAFE_METHODS = ['GET', 'HEAD', 'OPTIONS']
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class BasePermission(object):
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"""
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A base class from which all permission classes should inherit.
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"""
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def has_permission(self, request, view, obj=None):
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"""
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Return `True` if permission is granted, `False` otherwise.
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"""
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raise NotImplementedError(".has_permission() must be overridden.")
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class AllowAny(BasePermission):
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"""
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Allow any access.
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This isn't strictly required, since you could use an empty
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permission_classes list, but it's useful because it makes the intention
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more explicit.
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"""
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def has_permission(self, request, view, obj=None):
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return True
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class IsAuthenticated(BasePermission):
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"""
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Allows access only to authenticated users.
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"""
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def has_permission(self, request, view, obj=None):
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if request.user and request.user.is_authenticated():
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return True
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return False
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class IsAdminUser(BasePermission):
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"""
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Allows access only to admin users.
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"""
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def has_permission(self, request, view, obj=None):
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if request.user and request.user.is_staff:
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return True
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return False
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class IsAuthenticatedOrReadOnly(BasePermission):
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"""
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The request is authenticated as a user, or is a read-only request.
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"""
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def has_permission(self, request, view, obj=None):
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if (request.method in SAFE_METHODS or
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request.user and
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request.user.is_authenticated()):
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return True
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return False
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class DjangoModelPermissions(BasePermission):
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"""
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The request is authenticated using `django.contrib.auth` permissions.
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See: https://docs.djangoproject.com/en/dev/topics/auth/#permissions
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It ensures that the user is authenticated, and has the appropriate
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`add`/`change`/`delete` permissions on the model.
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This permission will only be applied against view classes that
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provide a `.model` attribute, such as the generic class-based views.
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"""
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# Map methods into required permission codes.
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# Override this if you need to also provide 'view' permissions,
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# or if you want to provide custom permission codes.
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perms_map = {
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'GET': [],
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'OPTIONS': [],
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'HEAD': [],
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'POST': ['%(app_label)s.add_%(model_name)s'],
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'PUT': ['%(app_label)s.change_%(model_name)s'],
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'PATCH': ['%(app_label)s.change_%(model_name)s'],
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'DELETE': ['%(app_label)s.delete_%(model_name)s'],
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}
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def get_required_permissions(self, method, model_cls):
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"""
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Given a model and an HTTP method, return the list of permission
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codes that the user is required to have.
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"""
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kwargs = {
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'app_label': model_cls._meta.app_label,
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'model_name': model_cls._meta.module_name
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}
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return [perm % kwargs for perm in self.perms_map[method]]
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def has_permission(self, request, view, obj=None):
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model_cls = getattr(view, 'model', None)
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if not model_cls:
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return True
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perms = self.get_required_permissions(request.method, model_cls)
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if (request.user and
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request.user.is_authenticated() and
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request.user.has_perms(perms)):
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return True
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return False
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