org.osgi.service.dmt.security

Class DmtPermission

java.lang.Object

java.security.Permission

org.osgi.service.dmt.security.DmtPermission

All Implemented Interfaces:

Serializable, Guard

public class DmtPermission
extends Permission

Controls access to management objects in the Device Management Tree (DMT). It is intended to control local access to the DMT. DmtPermission target string identifies the management object URI and the action field lists the OMA DM commands that are permitted on the management object. Example:

 DmtPermission("./OSGi/bundles", "Add,Replace,Get");
 

This means that owner of this permission can execute Add, Replace and Get commands on the ./OSGi/bundles management object. It is possible to use wildcards in both the target and the actions field. Wildcard in the target field means that the owner of the permission can access children nodes of the target node. Example:

 DmtPermission("./OSGi/bundles/*", "Get");
 

This means that owner of this permission has Get access on every child node of ./OSGi/bundles. The asterisk does not necessarily have to follow a '/' character. For example the "./OSGi/a*" target matches the ./OSGi/applications subtree.

If wildcard is present in the actions field, all legal OMA DM commands are allowed on the designated nodes(s) by the owner of the permission. Action names are interpreted case-insensitively, but the canonical action string returned by getActions() uses the forms defined by the action constants.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	ADD Holders of DmtPermission with the Add action present can create new nodes in the DMT, that is they are authorized to execute the createInteriorNode() and createLeafNode() methods of the DmtSession.
static String	DELETE Holders of DmtPermission with the Delete action present can delete nodes from the DMT, that is they are authorized to execute the deleteNode() method of the DmtSession.
static String	EXEC Holders of DmtPermission with the Exec action present can execute nodes in the DMT, that is they are authorized to call the execute() method of the DmtSession.
static String	GET Holders of DmtPermission with the Get action present can query DMT node value or properties, that is they are authorized to execute the isLeafNode(), getNodeAcl(), getEffectiveNodeAcl(), getMetaNode(), getNodeValue(), getChildNodeNames(), getNodeTitle(), getNodeVersion(), getNodeTimeStamp(), getNodeSize() and getNodeType() methods of the DmtSession.
static String	REPLACE Holders of DmtPermission with the Replace action present can update DMT node value or properties, that is they are authorized to execute the setNodeAcl(), setNodeTitle(), setNodeValue(), setNodeType() and renameNode() methods of the DmtSession.

Constructor Summary

Constructors

Constructor and Description
DmtPermission(String dmtUri, String actions) Creates a new DmtPermission object for the specified DMT URI with the specified actions.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj) Checks whether the given object is equal to this DmtPermission instance.
String	getActions() Returns the String representation of the action list.
int	hashCode() Returns the hash code for this permission object.
boolean	implies(Permission p) Checks if this DmtPermission object "implies" the specified permission.
PermissionCollection	newPermissionCollection() Returns a new PermissionCollection object for storing DmtPermission objects.

Methods inherited from class java.security.Permission

checkGuard, getName, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ADD

public static final String ADD

Holders of DmtPermission with the Add action present can create new nodes in the DMT, that is they are authorized to execute the createInteriorNode() and createLeafNode() methods of the DmtSession. This action is also required for the copy() command, which needs to perform node creation operations (among others).

See Also:

Constant Field Values

DELETE

public static final String DELETE

Holders of DmtPermission with the Delete action present can delete nodes from the DMT, that is they are authorized to execute the deleteNode() method of the DmtSession.

See Also:

Constant Field Values

EXEC

public static final String EXEC

Holders of DmtPermission with the Exec action present can execute nodes in the DMT, that is they are authorized to call the execute() method of the DmtSession.

See Also:

Constant Field Values

GET

public static final String GET

Holders of DmtPermission with the Get action present can query DMT node value or properties, that is they are authorized to execute the isLeafNode(), getNodeAcl(), getEffectiveNodeAcl(), getMetaNode(), getNodeValue(), getChildNodeNames(), getNodeTitle(), getNodeVersion(), getNodeTimeStamp(), getNodeSize() and getNodeType() methods of the DmtSession. This action is also required for the copy() command, which needs to perform node query operations (among others).

See Also:

Constant Field Values

REPLACE

public static final String REPLACE

Holders of DmtPermission with the Replace action present can update DMT node value or properties, that is they are authorized to execute the setNodeAcl(), setNodeTitle(), setNodeValue(), setNodeType() and renameNode() methods of the DmtSession. This action is also be required for the copy() command if the original node had a title property (which must be set in the new node).

See Also:

Constant Field Values

Constructor Detail

DmtPermission

public DmtPermission(String dmtUri,
                     String actions)

Creates a new DmtPermission object for the specified DMT URI with the specified actions. The given URI can be:

• "*", which matches all valid (see Uri.isValidUri(String)) absolute URIs;
• the prefix of an absolute URI followed by the * character (for example "./OSGi/L*"), which matches all valid absolute URIs beginning with the given prefix;
• a valid absolute URI, which matches itself.

Since the * character is itself a valid URI character, it can appear as the last character of a valid absolute URI. To distinguish this case from using * as a wildcard, the * character at the end of the URI must be escaped with the \ character. For example the URI "./a*" matches "./a", "./aa", "./a/b" etc. while "./a\*" matches "./a*" only.

The actions string must either be "*" to allow all actions, or it must contain a non-empty subset of the valid actions, defined as constants in this class.

Parameters:

dmtUri - URI of the management object (or subtree)

actions - OMA DM actions allowed

Throws:

NullPointerException - if any of the parameters are null

IllegalArgumentException - if any of the parameters are invalid

Method Detail

equals

public boolean equals(Object obj)

Checks whether the given object is equal to this DmtPermission instance. Two DmtPermission instances are equal if they have the same target string and the same action mask. The "*" action mask is considered equal to a mask containing all actions.

Specified by:

equals in class Permission

Parameters:

obj - the object to compare to this DmtPermission instance

Returns:

true if the parameter represents the same permissions as this instance

getActions

public String getActions()

Returns the String representation of the action list. The allowed actions are listed in the following order: Add, Delete, Exec, Get, Replace. The wildcard character is not used in the returned string, even if the class was created using the "*" wildcard.

Specified by:

getActions in class Permission

Returns:

canonical action list for this permission object

hashCode

public int hashCode()

Returns the hash code for this permission object. If two DmtPermission objects are equal according to the equals(Object) method, then calling this method on each of the two DmtPermission objects must produce the same integer result.

Specified by:

hashCode in class Permission

Returns:

hash code for this permission object

implies

public boolean implies(Permission p)

Checks if this DmtPermission object "implies" the specified permission. This method returns false if and only if at least one of the following conditions are fulfilled for the specified permission:

• it is not a DmtPermission
• its set of actions contains an action not allowed by this permission
• the set of nodes defined by its path contains a node not defined by the path of this permission

Specified by:

implies in class Permission

Parameters:

p - the permission to check for implication

Returns:

true if this DmtPermission instance implies the specified permission

newPermissionCollection

public PermissionCollection newPermissionCollection()

Returns a new PermissionCollection object for storing DmtPermission objects.

Overrides:

newPermissionCollection in class Permission

Returns:

the new PermissionCollection