Package org.jboss.security.acl

Class ACLProviderImpl

java.lang.Object

org.jboss.security.acl.ACLProviderImpl

All Implemented Interfaces:

ACLProvider

Direct Known Subclasses:

RoleBasedACLProviderImpl

public class ACLProviderImpl
extends Object
implements ACLProvider

This class is the standard ACLProvider implementation. The access control decisions are based on the name of the specified identity (that is, it assumes that entries in an ACL are keyed by the name of the identity and not by other attributes, like the its roles).

Author:

Stefan Guilhen

Field Summary

Fields

Modifier and Type	Field	Description
protected ACLPersistenceStrategy	strategy	persistence strategy used to retrieve the ACLs

Constructor Summary

Constructors

Constructor	Description
ACLProviderImpl()

Method Summary

Modifier and Type	Method	Description
protected void	fillEntitlements(Set<EntitlementEntry> entitlements, Resource resource, String identityName, ACLPermission permission)	Helper method that populates the entitlements collection as it traverses through the resources.
<T> Set<T>	getEntitlements(Class<T> clazz, Resource resource, Identity identity)	For a given Resource and an Identity, return all the entitlements Eg: A portal page can consist of say 10 components such as windows, subpages etc.
protected ACLPermission	getInitialPermissions(Resource resource, String identityName)	This method retrieves the permissions the specified identity has over the specified resource.
ACLPersistenceStrategy	getPersistenceStrategy()	Obtains the ACLPersistenceStrategy associated with this provider.
void	initialize(Map<String,Object> sharedState, Map<String,Object> options)	Initialize the provider
boolean	isAccessGranted(Resource resource, Identity identity, ACLPermission permission)	Checks if the given identity has the permissions needed to access the specified resource.
protected Class<?>	loadClass(String name)	Loads the specified class using a PrivilegedExceptionAction.
void	setPersistenceStrategy(ACLPersistenceStrategy persistenceStrategy)	Sets the persistence strategy to be used by this provider.
boolean	tearDown()	Give an opportunity for the provider to finalize the operations

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

strategy

protected ACLPersistenceStrategy strategy

persistence strategy used to retrieve the ACLs

Constructor Detail

ACLProviderImpl

public ACLProviderImpl()

Method Detail

initialize

public void initialize(Map<String,Object> sharedState,
                       Map<String,Object> options)

Description copied from interface: ACLProvider

Initialize the provider

Specified by:

initialize in interface ACLProvider

Parameters:

sharedState - Shared State

options - Options

getEntitlements

public <T> Set<T> getEntitlements(Class<T> clazz,
                                  Resource resource,
                                  Identity identity)
                           throws AuthorizationException

Description copied from interface: ACLProvider

For a given Resource and an Identity, return all the entitlements Eg: A portal page can consist of say 10 components such as windows, subpages etc. Now the Portal page can be the resource and for a given identity, the entitlements would be the subset of these 10 components to which the identity has access

Specified by:

getEntitlements in interface ACLProvider

Returns:

Throws:

AuthorizationException

fillEntitlements

protected void fillEntitlements(Set<EntitlementEntry> entitlements,
                                Resource resource,
                                String identityName,
                                ACLPermission permission)

Helper method that populates the entitlements collection as it traverses through the resources. The resources are visited using a depth-first search algorithm, and when each node is visited one of the following happens:

an ACL for the resource is located and there is an entry for the identity - the permissions assigned to the identity are used to construct the EntitlementEntry object and this object is added to the collection. The method is then called recursively for each one of the resource's children passing the permissions that were extracted from the ACL.

an ACL for the resource is found, but there is no entry for the identity - this means the identity doesn't have any permissions regarding the specified resource. Thus, no EntitlementEntry object is constructed and the method simply returns. No child resources are processed as it is assumed that the identity doesn't have the right to do anything in the resource's subtree.

no ACL is found - this means that the resource itself is not protected by any ACL. We assume that if a parent resource has an ACL, then the permissions assigned to the parent's ACL should be used.

Parameters:

entitlements - a reference for the collection of EntitlementEntry objects that is being constructed.

resource - the Resource being visited.

identityName - a String representing the identity for which the entitlements are being built.

permission - the ACLPermission to be used in case no ACL is found for the resource being visited.

getInitialPermissions

protected ACLPermission getInitialPermissions(Resource resource,
                                              String identityName)

This method retrieves the permissions the specified identity has over the specified resource. It starts by looking for the resource's ACL. If one is found and if the ACL has entry for the identity, the respective permissions are returned. If no entry is found, we assume the identity hasn't been assigned any permissions and null is returned.

If the resource doesn't have an associated ACL, we start looking for an ACL in the parent resource recursively, until an ACL is located or until no parent resource is found. In the first case, the algorithm described above is used to return the identity's permissions. In the latter case, we return all permissions (lack of an ACL means that the resource is not protected and the user should be granted all permissions).

Parameters:

resource - the Resource for which we want to discover the permissions that have been assigned to the specified identity.

identityName - a String representing the identity for which we want to discover the permissions regarding the specified resource.

Returns:

an ACLPermission containing the permissions that have been assigned to the identity with respect to the specified resource, or null if the identity has no permissions at all.

getPersistenceStrategy

public ACLPersistenceStrategy getPersistenceStrategy()

Description copied from interface: ACLProvider

Obtains the ACLPersistenceStrategy associated with this provider.

Specified by:

getPersistenceStrategy in interface ACLProvider

Returns:

a reference to the ACLPersistenceStrategy used by this provider.

setPersistenceStrategy

public void setPersistenceStrategy(ACLPersistenceStrategy persistenceStrategy)

Description copied from interface: ACLProvider

Sets the persistence strategy to be used by this provider.

Specified by:

setPersistenceStrategy in interface ACLProvider

Parameters:

persistenceStrategy - a reference to the ACLPersistenceStrategy to be used.

isAccessGranted

public boolean isAccessGranted(Resource resource,
                               Identity identity,
                               ACLPermission permission)
                        throws AuthorizationException

Description copied from interface: ACLProvider

Checks if the given identity has the permissions needed to access the specified resource. This involves finding the ACL associated with the resource and consulting the ACL to determine if access should be granted or not to the identity.

Specified by:

isAccessGranted in interface ACLProvider

Parameters:

resource - the Resource being accessed.

identity - the Identity trying to access the resource.

permission - the permissions needed to access the resource.

Returns:

true if the identity has enough permissions to access the resource; false otherwise.

Throws:

AuthorizationException - if no ACL can be found for the specified resource.

tearDown

public boolean tearDown()

Description copied from interface: ACLProvider

Give an opportunity for the provider to finalize the operations

Specified by:

tearDown in interface ACLProvider

Returns:

loadClass

protected Class<?> loadClass(String name)
                      throws PrivilegedActionException

Loads the specified class using a PrivilegedExceptionAction.

Parameters:

name - a String containing the fully-qualified name of the class to be loaded.

Returns:

a reference to the loaded Class.

Throws:

PrivilegedActionException - if an error occurs while loading the specified class.