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/*-
* ============LICENSE_START=======================================================
* simulators
* ================================================================================
* Copyright (C) 2017-2021 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.simulators;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import org.onap.policy.common.utils.coder.Coder;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardCoder;
import org.onap.policy.common.utils.resources.ResourceUtils;
import org.onap.policy.models.decisions.concepts.DecisionRequest;
import org.onap.policy.models.decisions.concepts.DecisionResponse;
import org.onap.policy.models.tosca.authorative.concepts.ToscaServiceTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Path("/policy/pdpx/v1")
public class XacmlSimulatorJaxRs {
private static final Logger logger = LoggerFactory.getLogger(XacmlSimulatorJaxRs.class);
public static final String POLICY_CONFIG_OPER_PREFIX = "org/onap/policy/simulators/xacml/xacml.configure.";
public static final String DENY_CLNAME = "denyGuard";
public static final Coder coder = new StandardCoder();
// @formatter:off
private Map<String, Function<DecisionRequest, DecisionResponse>> action2method = Map.of(
"guard", this::guardDecision,
"configure", this::configureDecision
);
// @formatter:on
/**
* Get a XACML decision.
*
* @param req the request
* @return the response
*/
@POST
@Path("/decision")
@Consumes(MediaType.APPLICATION_JSON)
@Produces("application/json")
public DecisionResponse getDecision(DecisionRequest req) {
Function<DecisionRequest, DecisionResponse> func = action2method.get(req.getAction());
if (func != null) {
return func.apply(req);
}
DecisionResponse response = new DecisionResponse();
response.setMessage("unsupported action: " + req.getAction());
return response;
}
private DecisionResponse guardDecision(DecisionRequest req) {
@SuppressWarnings("unchecked")
Map<String, String> guard = (Map<String, String>) req.getResource().get("guard");
String clName = guard.get("clname");
var response = new DecisionResponse();
response.setStatus(DENY_CLNAME.equals(clName) ? "Deny" : "Permit");
response.setAdvice(Collections.emptyMap());
response.setObligations(Collections.emptyMap());
response.setPolicies(Collections.emptyMap());
return response;
}
private DecisionResponse configureDecision(DecisionRequest req) {
var response = new DecisionResponse();
response.setPolicies(new HashMap<>());
Map<String, Object> resources = req.getResource();
var policyId = resources.get("policy-id");
if (policyId != null) {
String fileName = POLICY_CONFIG_OPER_PREFIX + policyId + ".json";
try {
var policyJson = ResourceUtils.getResourceAsString(fileName);
var toscaServiceTemplate = coder.decode(policyJson, ToscaServiceTemplate.class);
toscaServiceTemplate.getToscaTopologyTemplate().getPolicies()
.forEach(policyMap -> response.getPolicies().putAll(policyMap));
} catch (CoderException e) {
logger.warn("cannot decode policy file: {}", fileName, e);
response.setMessage("cannot decode policy");
} catch (NullPointerException e) {
logger.warn("cannot read policy simulator file", e);
response.setMessage("cannot read policy simulator file");
}
} else {
// the current simulator only supports searching by policy-id
// future changes may support getting policies by policy-type
response.setMessage("resource must contain policy-id key");
}
return response;
}
}
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