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/*
* Copyright (c) OSGi Alliance (2001, 2013). All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.osgi.service.useradmin;
/**
* The {@code Authorization} interface encapsulates an authorization context on
* which bundles can base authorization decisions, where appropriate.
*
* Bundles associate the privilege to access restricted resources or operations
* with roles. Before granting access to a restricted resource or operation, a
* bundle will check if the {@code Authorization} object passed to it possess
* the required role, by calling its {@code hasRole} method.
*
* Authorization contexts are instantiated by calling the
* {@link UserAdmin#getAuthorization(User)} method.
*
*
* Trusting Authorization objects
*
* There are no restrictions regarding the creation of {@code Authorization}
* objects. Hence, a service must only accept {@code Authorization} objects from
* bundles that has been authorized to use the service using code based (or Java
* 2) permissions.
*
*
* In some cases it is useful to use {@code ServicePermission} to do the code
* based access control. A service basing user access control on
* {@code Authorization} objects passed to it, will then require that a calling
* bundle has the {@code ServicePermission} to get the service in question. This
* is the most convenient way. The OSGi environment will do the code based
* permission check when the calling bundle attempts to get the service from the
* service registry.
*
* Example: A servlet using a service on a user's behalf. The bundle with the
* servlet must be given the {@code ServicePermission} to get the Http Service.
*
* However, in some cases the code based permission checks need to be more
* fine-grained. A service might allow all bundles to get it, but require
* certain code based permissions for some of its methods.
*
* Example: A servlet using a service on a user's behalf, where some service
* functionality is open to anyone, and some is restricted by code based
* permissions. When a restricted method is called (e.g., one handing over an
* {@code Authorization} object), the service explicitly checks that the calling
* bundle has permission to make the call.
*
* @noimplement
* @author $Id: 4786641d1725f18fb3bc160059d7f8b28e46bbab $
*/
public interface Authorization {
/**
* Gets the name of the {@link User} that this {@code Authorization} context
* was created for.
*
* @return The name of the {@link User} object that this
* {@code Authorization} context was created for, or {@code null} if
* no user was specified when this {@code Authorization} context was
* created.
*/
public String getName();
/**
* Checks if the role with the specified name is implied by this
* {@code Authorization} context.
*
*
* Bundles must define globally unique role names that are associated with
* the privilege of accessing restricted resources or operations. Operators
* will grant users access to these resources, by creating a {@link Group}
* object for each role and adding {@link User} objects to it.
*
* @param name The name of the role to check for.
*
* @return {@code true} if this {@code Authorization} context implies the
* specified role, otherwise {@code false}.
*/
public boolean hasRole(String name);
/**
* Gets the names of all roles implied by this {@code Authorization}
* context.
*
* @return The names of all roles implied by this {@code Authorization}
* context, or {@code null} if no roles are in the context. The
* predefined role {@code user.anyone} will not be included in this
* list.
*/
public String[] getRoles();
}