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If you request permissions using this key, then the browser may inform the user at install time that the extension is requesting certain privileges, and ask them to confirm that they are happy to grant these privileges. The browser may also allow the user to inspect an extension's privileges after installation. As the request to grant privileges may impact on users' willingness to install your extension, requesting privileges is worth careful consideration. For example, you want to avoid requesting unnecessary permissions and may want to provide information about why you are requesting permissions in your extension's store description. More information on the issues you should consider is provided in the article Request the right permissions.

Host permissions are specified as match patterns, and each pattern identifies a group of URLs for which the extension is requesting extra privileges. For example, a host permission could be "*://developer.mozilla.org/*".

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The intention of this permission is to enable extensions to fulfill a common use case, without having to give them very powerful permissions. Many extensions want to "do something to the current page when the user asks".

The activeTab permission enables scripting access to the top level tab's page and same origin frames. Running scripts or modifying styles inside cross-origin frames may require additional host permissions. Of course, restrictions and limitations related to particular sites and URI schemes are applied as well.

The intention of this permission is to enable extensions to fulfill a common use case, without having to give them very powerful permissions. Many extensions want to \"do something to the current page when the user asks\".

DescriptionUse the chrome.permissions API to request declared optional permissions at run time rather than install time, so users understand why the permissions are needed and grant only those that are necessary.

For example, the optional permissions extension's core functionality is overriding the new tab page. One feature is displaying the user's goal of the day. This feature only requires the storage permission, which does not include a warning. The extension has an additional feature, that users can enable by clicking the following button:

If you want to request hosts that you only discover at runtime, include "https://*/*" in your extension's optional_host_permissions field. This lets you specify any origin in Permissions.origins as long as it has a matchingscheme.

True if the extension has the specified permissions. If an origin is specified as both an optional permission and a content script match pattern, this will return false unless both permissions are granted.

The extension's active permissions. Note that the origins property will contain granted origins from those specified in the permissions and optional_permissions keys in the manifest and those associated with Content Scripts.

Requests access to the specified permissions, displaying a prompt to the user if necessary. These permissions must either be defined in the optional_permissions field of the manifest or be required permissions that were withheld by the user. Paths on origin patterns will be ignored. You can request subsets of optional origin permissions; for example, if you specify *://*\/* in the optional_permissions section of the manifest, you can request If there are any problems requesting the permissions, runtime.lastError will be set.

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.

Note: With the exception of DjangoObjectPermissions, the providedpermission classes in rest_framework.permissions do not implement themethods necessary to check object permissions.

If you wish to use the provided permission classes in order to check objectpermissions, you must subclass them and implement thehas_object_permission() method described in the Custompermissions section (below).

Because the get_object() method is not called, object level permissions from the has_object_permission() method are not applied when creating objects. In order to restrict object creation you need to implement the permission check either in your Serializer class or override the perform_create() method of your ViewSet class.

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.

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 or get_queryset() method. Authorization will only be granted if the user is authenticated and has the relevant model permissions assigned. The appropriate model is determined by checking get_queryset().model or queryset.model.

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.

Note: If you need object level view permissions for GET, HEAD and OPTIONS requests and are using django-guardian for your object-level permissions backend, you'll want to consider using the DjangoObjectPermissionsFilter class provided by the djangorestframework-guardian2 package. It ensures that list endpoints only return results including objects for which the user has appropriate view permissions.

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. Similarly, to change the code identifier associated with the exception, implement a code attribute directly on your custom permission - otherwise the default_code attribute from PermissionDenied will be used.

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:

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 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. 006ab0faaa