Package org.springframework.security.messaging.access.expression

Class MessageExpressionVoter<T>

java.lang.Object

org.springframework.security.messaging.access.expression.MessageExpressionVoter<T>

All Implemented Interfaces:

AccessDecisionVoter<org.springframework.messaging.Message<T>>

public class MessageExpressionVoter<T>
extends java.lang.Object
implements AccessDecisionVoter<org.springframework.messaging.Message<T>>

Voter which handles Message authorisation decisions. If a MessageExpressionConfigAttribute is found, then its expression is evaluated. If true, ACCESS_GRANTED is returned. If false, ACCESS_DENIED is returned. If no MessageExpressionConfigAttribute is found, then ACCESS_ABSTAIN is returned.

Since:

4.0

Field Summary

Fields inherited from interface org.springframework.security.access.AccessDecisionVoter

ACCESS_ABSTAIN, ACCESS_DENIED, ACCESS_GRANTED

Constructor Summary

Constructors

Constructor	Description
MessageExpressionVoter()

Method Summary

Modifier and Type	Method	Description
void	setExpressionHandler(SecurityExpressionHandler<org.springframework.messaging.Message<T>> expressionHandler)
boolean	supports(java.lang.Class<?> clazz)	Indicates whether the AccessDecisionVoter implementation is able to provide access control votes for the indicated secured object type.
boolean	supports(ConfigAttribute attribute)	Indicates whether this AccessDecisionVoter is able to vote on the passed ConfigAttribute.
int	vote(Authentication authentication, org.springframework.messaging.Message<T> message, java.util.Collection<ConfigAttribute> attributes)	Indicates whether or not access is granted.

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageExpressionVoter

public MessageExpressionVoter()

Method Detail

vote

public int vote(Authentication authentication,
                org.springframework.messaging.Message<T> message,
                java.util.Collection<ConfigAttribute> attributes)

Description copied from interface: AccessDecisionVoter

Indicates whether or not access is granted.

The decision must be affirmative (ACCESS_GRANTED), negative ( ACCESS_DENIED) or the AccessDecisionVoter can abstain ( ACCESS_ABSTAIN) from voting. Under no circumstances should implementing classes return any other value. If a weighting of results is desired, this should be handled in a custom AccessDecisionManager instead.

Unless an AccessDecisionVoter is specifically intended to vote on an access control decision due to a passed method invocation or configuration attribute parameter, it must return ACCESS_ABSTAIN. This prevents the coordinating AccessDecisionManager from counting votes from those AccessDecisionVoters without a legitimate interest in the access control decision.

Whilst the secured object (such as a MethodInvocation) is passed as a parameter to maximise flexibility in making access control decisions, implementing classes should not modify it or cause the represented invocation to take place (for example, by calling MethodInvocation.proceed()).

Specified by:

vote in interface AccessDecisionVoter<T>

Parameters:

authentication - the caller making the invocation

message - the secured object being invoked

attributes - the configuration attributes associated with the secured object

Returns:

either AccessDecisionVoter.ACCESS_GRANTED, AccessDecisionVoter.ACCESS_ABSTAIN or AccessDecisionVoter.ACCESS_DENIED

supports

public boolean supports(ConfigAttribute attribute)

Description copied from interface: AccessDecisionVoter

Indicates whether this AccessDecisionVoter is able to vote on the passed ConfigAttribute.

This allows the AbstractSecurityInterceptor to check every configuration attribute can be consumed by the configured AccessDecisionManager and/or RunAsManager and/or AfterInvocationManager.

Specified by:

supports in interface AccessDecisionVoter<T>

Parameters:

attribute - a configuration attribute that has been configured against the AbstractSecurityInterceptor

Returns:

true if this AccessDecisionVoter can support the passed configuration attribute

supports

public boolean supports(java.lang.Class<?> clazz)

Description copied from interface: AccessDecisionVoter

Indicates whether the AccessDecisionVoter implementation is able to provide access control votes for the indicated secured object type.

Specified by:

supports in interface AccessDecisionVoter<T>

Parameters:

clazz - the class that is being queried

Returns:

true if the implementation can process the indicated class

setExpressionHandler

public void setExpressionHandler(SecurityExpressionHandler<org.springframework.messaging.Message<T>> expressionHandler)