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/*
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* This program is a part of the IoTa Project.
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*
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* Copyright © 2011-2012 Université de Caen Basse-Normandie, GREYC
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* Copyright © 2011 Orange Labs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* <http://www.gnu.org/licenses/>
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*
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* See AUTHORS for a list of contributors.
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*/
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package fr.unicaen.iota.xacml.combine;
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import com.sun.xacml.EvaluationCtx;
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import com.sun.xacml.combine.PolicyCombinerElement;
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import com.sun.xacml.combine.PolicyCombiningAlgorithm;
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import com.sun.xacml.ctx.Result;
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import fr.unicaen.iota.xacml.policy.GroupPolicy;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.util.Iterator;
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import java.util.List;
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/**
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* This is the standard SC Group rule combining algorithm. It allows a single
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* evaluation of not applicable or indeterminate results to take precedence over
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* any number of permit, deny. The result will be Deny.
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*/
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public class SCGroupPolicyAlg extends PolicyCombiningAlgorithm {
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/**
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* The standard URN used to identify this algorithm
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*/
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public static final String algId =
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"urn:oasis:names:tc:xacml:1.0:policy-combining-algorithm:"
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+ "sc-policy-group";
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// a URI form of the identifier
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private static URI identifierURI;
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// exception if the URI was invalid, which should never be a problem
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private static RuntimeException earlyException;
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static {
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try {
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identifierURI = new URI(algId);
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} catch (URISyntaxException se) {
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earlyException = new IllegalArgumentException();
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earlyException.initCause(se);
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}
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}
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/**
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* Standard constructor.
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*/
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public SCGroupPolicyAlg() {
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super(identifierURI);
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if (earlyException != null) {
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throw earlyException;
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}
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}
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@Override
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public URI getIdentifier() {
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return identifierURI;
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}
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/**
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* Protected constructor used by the ordered version of this algorithm.
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*
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* @param identifier the algorithm's identifier
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*/
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public SCGroupPolicyAlg(URI identifier) {
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super(identifier);
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}
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/**
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* Applies the combining rule to the set of rules based on the evaluation
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* context.
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*
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* @param context the context from the request
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* @param parameters a (possibly empty) non-null
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* <code>List</code> of
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* <code>CombinerParameter<code>s
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* @param ruleElements the rules to combine
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*
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* @return the result of running the combining algorithm
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*/
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@Override
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public Result combine(EvaluationCtx context, List parameters, List ruleElements) {
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Iterator it = ruleElements.iterator();
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while (it.hasNext()) {
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GroupPolicy gp = (GroupPolicy) ((PolicyCombinerElement) (it.next())).getPolicy();
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Result result = gp.evaluate(context);
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int value = result.getDecision();
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// if there was a value of DENY, INDETERMINATE or NOT_APPLICABLE, then regardless of what else
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// we've seen, we always return DENY
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if (value == Result.DECISION_PERMIT) {
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return new Result(Result.DECISION_PERMIT);
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}
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}
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return new Result(Result.DECISION_DENY);
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}
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}
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