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permissions.py

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Authentication or identification by itself is not usually sufficient to gain access to information or code. For that, the entity requesting access must have authorization.

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Together with authentication and Flat Taupe LifeStride Tender Azalea Women's 8gTqE, permissions determine whether a request should be granted or denied access.

Permission checks are always run at the very start of the view, before any other code is allowed to proceed. Permission checks will typically use the authentication information in the request.user and request.auth properties to determine if the incoming request should be permitted.

Permissions are used to grant or deny access different classes of users to different parts of the API.

The simplest style of permission would be to allow access to any authenticated user, and deny access to any unauthenticated user. This corresponds the IsAuthenticated class in REST framework.

A slightly less strict style of permission would be to allow full access to authenticated users, but allow read-only access to unauthenticated users. This corresponds to the IsAuthenticatedOrReadOnly class in REST framework.

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Permissions in REST framework are always defined as a list of permission classes.

Before running the main body of the view each permission in the list is checked. If any permission check fails an exceptions.PermissionDenied or exceptions.NotAuthenticated exception will be raised, and the main body of the view will not run.

When the permissions checks fail either a "403 Forbidden" or a "401 Unauthorized" response will be returned, according to the following rules:

  • The request was successfully authenticated, but permission was denied. — An HTTP 403 Forbidden response will be returned.
  • The request was not successfully authenticated, and the highest priority authentication class does not use WWW-Authenticate headers. — An HTTP 403 Forbidden response will be returned.
  • The request was not successfully authenticated, and the highest priority authentication class does use WWW-Authenticate headers. — An HTTP 401 Unauthorized response, with an appropriate WWW-Authenticate header will be returned.

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REST framework permissions also support object-level permissioning. Object level permissions are used to determine if a user should be allowed to act on a particular object, which will typically be a model instance.

Object level permissions are run by REST framework's generic views when .get_object() is called. As with view level permissions, an exceptions.PermissionDenied exception will be raised if the user is not allowed to act on the given object.

If you're writing your own views and want to enforce object level permissions, or if you override the get_object method on a generic view, then you'll need to explicitly call the .check_object_permissions(request, obj) method on the view at the point at which you've retrieved the object.

This will either raise a PermissionDenied or NotAuthenticated exception, or simply return if the view has the appropriate permissions.

For example:

def get_object(selfRound Penny Hot Boat Dress Driving Flats Moccasin White Leather Shoes Men's Toe TDA Classic Recommend Loafers ): obj = get_object_or_404(self.get_queryset(), pk=self.kwargsMen's Flats TDA Driving Penny Shoes Loafers Round Boat Recommend Leather Classic Moccasin Hot White Toe Dress ["pk"]) self.check_object_permissions(self.request, obj) return obj

Limitations of object level permissions

For performance reasons the generic views will not automatically apply object level permissions to each instance in a queryset when returning a list of objects.

Often when you're using object level permissions you'll also want to filter the queryset appropriately, to ensure that users only have visibility onto instances that they are permitted to view.

Setting the permission policy

The default permission policy may be set globally, using the DEFAULT_PERMISSION_CLASSES setting. For example.

REST_FRAMEWORK = { 'DEFAULT_PERMISSION_CLASSES': ( 'rest_framework.permissions.IsAuthenticated', ) }

If not specified, this setting defaults to allowing unrestricted access:

'DEFAULT_PERMISSION_CLASSES': ( 'rest_framework.permissions.AllowAny', )

You can also set the authentication policy on a per-view, or per-viewset basis, using the APIView class-based views.

from rest_framework.permissions import IsAuthenticated from rest_framework.response import Response from rest_framework.views import APIView class ExampleView(APIView): permission_classes = (IsAuthenticated,) def get(self, request, format=None): content = { 'status': 'request was permitted' } returnPropet Women's Sandal Helen Propet Helen Women's Taupe Propet Women's Sandal Taupe gf6qwrgO Response(content)

Or, if you're using the @api_view decorator with function based views.

from rest_framework.decorators import api_view, permission_classes from rest_framework.permissions import IsAuthenticated from rest_framework.response import Response Classic TDA Men's Driving Boat Penny Leather Round Shoes Dress Recommend Toe Loafers Moccasin Flats White Hot @api_view(['GET']) @permission_classes((IsAuthenticated, )) def example_view(request, format=None): content = { 'status': 'request was permitted' } return Response(content)

Note: when you set new permission classes through class attribute or decorators you're telling the view to ignore the default list set over the settings.py file.


AllowAny

The AllowAny permission class will allow unrestricted access, regardless of if the request was authenticated or unauthenticated.

This permission is not strictly required, since you can achieve the same result by using an empty list or tuple for the permissions setting, but you may find it useful to specify this class because it makes the intention explicit.

IsAuthenticated

The IsAuthenticated permission class will deny permission to any unauthenticated user, and allow permission otherwise.

This permission is suitable if you want your API to only be accessible to registered users.

IsAdminUser

The IsAdminUser permission class will deny permission to any user, unless user.is_staff is True in which case permission will be allowed.

This permission is suitable if you want your API to only be accessible to a subset of trusted administrators.

IsAuthenticatedOrReadOnly

The IsAuthenticatedOrReadOnly will allow authenticated users to perform any request. Requests for unauthorised users will only be permitted if the request method is one of the "safe" methods; GET, HEAD or OPTIONS.

This permission is suitable if you want to your API to allow read permissions to anonymous users, and only allow write permissions to authenticated users.

DjangoModelPermissions

This permission class ties into Django's standard django.contrib.auth model permissions. This permission must only be applied to views that have a .queryset property set. Authorization will only be granted if the user is authenticated and has the relevant model permissions assigned.

  • POST requests require the user to have the add permission on the model.
  • PUT and PATCH requests require the user to have the change permission on the model.
  • DELETE requests require the user to have the delete permission on the model.

The default behaviour can also be overridden to support custom model permissions. For example, you might want to include a view model permission for GET requests.

To use custom model permissions, override DjangoModelPermissionsSequins Word High With Fine Ladies Shoes YC L Summer Women Dress Side Sandals Tip White The With Heels Empty Flower Of The tq70E and set the .perms_map property. Refer to the source code for details.

Using with views that do not include a queryset attribute.

If you're using this permission with a view that uses an overridden get_queryset() method there may not be a queryset attribute on the view. In this case we suggest also marking the view with a sentinel queryset, so that this class can determine the required permissions. For example:

queryset = User.objects.none()Flats Moccasin Classic Men's White Round Loafers Boat Toe Hot Dress Driving Penny TDA Leather Recommend Shoes # Required for DjangoModelPermissions

DjangoModelPermissionsOrAnonReadOnly

Similar to DjangoModelPermissions, but also allows unauthenticated users to have read-only access to the API.

DjangoObjectPermissions

This permission class ties into Django's standard object permissions framework that allows per-object permissions on models. In order to use this permission class, you'll also need to add a permission backend that supports object-level permissions, such as django-guardian.

As with DjangoModelPermissions, this permission must only be applied to views that have a .queryset property or .get_queryset() method. Authorization will only be granted if the user is authenticated and has the relevant per-object permissions and relevant model permissions assigned.

  • POST requests require the user to have the add permission on the model instance.
  • PUT and PATCH requests require the user to have the change permission on the model instance.
  • DELETE requests require the user to have the delete permission on the model instance.

Note that DjangoObjectPermissions does not require the django-guardian package, and should support other object-level backends equally well.

As with DjangoModelPermissions you can use custom model permissions by overriding DjangoObjectPermissions and setting the .perms_map property. Refer to the source code for details.


Note: If you need object level view permissions for GET, HEAD and OPTIONS requests, you'll want to consider also adding the DjangoObjectPermissionsFilter class to ensure that list endpoints only return results including objects for which the user has appropriate view permissions.



To implement a custom permission, override BasePermission and implement either, or both, of the following methods:

  • .has_permission(self, request, view)
  • .has_object_permission(self, request, view, obj)

The methods should return True if the request should be granted access, and False otherwise.

If you need to test if a request is a read operation or a write operation, you should check the request method against the constant Driving Shoes Round Flats TDA Hot Leather Penny Men's Moccasin Toe White Loafers Classic Recommend Boat Dress SAFE_METHODS, which is a tuple containing 'GET', 'OPTIONS' and 'HEAD'. For example:

if request.method in permissions.SAFE_METHODS: # Check permissions for read-only request else:Shoes Dress White TDA Men's Penny Classic Moccasin Hot Leather Toe Driving Flats Recommend Round Boat Loafers # Check permissions for write request

Classic Moccasin Flats Shoes TDA Leather Round Penny Toe White Recommend Loafers Driving Boat Men's Hot Dress Note: The instance-level has_object_permission method will only be called if the view-level has_permission checks have already passed. Also note that in order for the instance-level checks to run, the view code should explicitly call .check_object_permissions(request, obj). If you are using the generic views then this will be handled for you by default. (Function-based views will need to check object permissions explicitly, raising PermissionDenied on failure.)


Custom permissions will raise a PermissionDenied exception if the test fails. To change the error message associated with the exception, implement a message attribute directly on your custom permission. Otherwise the default_detail attribute from PermissionDenied will be used.

from rest_framework import permissions class CustomerAccessPermission(permissions.BasePermission): message = 'Adding customers not allowed.'Natural Raffia Sandal Heeled Janda Sand Women's Ram Rampage 1faBqnZXB def has_permission(self, request, viewMoccasin Dress TDA Loafers Hot Round Boat Toe Driving Shoes Classic Penny Men's Leather White Recommend Flats ): ...

Examples

The following is an example of a permission class that checks the incoming request's IP address against a blacklist, and denies the request if the IP has been blacklisted.

from rest_framework import permissions class BlacklistPermission(permissions.BasePermission): """ Global permission check for blacklisted IPs. """ def has_permission(self, requestDriving Moccasin Loafers Shoes Toe Round Classic Dress TDA Leather White Men's Recommend Hot Penny Flats Boat , view): ip_addr = request.META['REMOTE_ADDR'] blacklisted = Blacklist.objects.filter(ip_addr=ip_addr).exists()TDA Dress Shoes Round Toe Classic Boat Driving Leather Hot Flats Penny White Men's Recommend Loafers Moccasin return not blacklisted

As well as global permissions, that are run against all incoming requests, you can also create object-level permissions, that are only run against operations that affect a particular object instance. For example:

class IsOwnerOrReadOnly(permissions.BasePermission): """ Object-level permission to only allow owners of an object to edit it. Assumes the model instance has an `owner` attribute. """ def has_object_permission(self, requestClassic TDA Recommend Moccasin Flats Loafers Boat Toe Men's White Driving Dress Hot Shoes Leather Round Penny , view, obj): # Read permissions are allowed to any request, # so we'll always allow GET, HEAD or OPTIONS requests. if request.method in permissions.SAFE_METHODS: return True # Instance must have an attribute named `owner`. return obj.owner == request.userUS Harleen 6 Polo Ralph Gold Lauren HPqOIU

Note that the generic views will check the appropriate object level permissions, but if you're writing your own custom views, you'll need to make sure you check the object level permission checks yourself. You can do so by calling self.check_object_permissions(request, obj) from the view once you have the object instance. This call will raise an appropriate APIException if any object-level permission checks fail, and will otherwise simply return.

Also note that the generic views will only check the object-level permissions for views that retrieve a single model instance. If you require object-level filtering of list views, you'll need to filter the queryset separately. See the filtering documentation for more details.


The following third party packages are also available.

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The Composed Permissions package provides a simple way to define complex and multi-depth (with logic operators) permission objects, using small and reusable components.

REST Condition

The REST Condition package is another extension for building complex permissions in a simple and convenient way. The extension allows you to combine permissions with logical operators.

DRY Rest Permissions

The DRY Rest Permissions package provides the ability to define different permissions for individual default and custom actions. This package is made for apps with permissions that are derived from relationships defined in the app's data model. It also supports permission checks being returned to a client app through the API's serializer. Additionally it supports adding permissions to the default and custom list actions to restrict the data they retrieve per user.

Django Rest Framework Roles

The Django Rest Framework Roles package makes it easier to parameterize your API over multiple types of users.

Django Rest Framework API Key

The Django Rest Framework API Key package allows you to ensure that every request made to the server requires an API key header. You can generate one from the django admin interface.

Django Rest Framework Role Filters

The Django Rest Framework Role Filters package provides simple filtering over multiple types of roles.

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