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/*-
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.pdp.xacml.application.common.std;
import com.att.research.xacml.api.Request;
import com.att.research.xacml.api.Response;
import com.att.research.xacml.api.pdp.PDPEngine;
import com.att.research.xacml.api.pdp.PDPEngineFactory;
import com.att.research.xacml.api.pdp.PDPException;
import com.att.research.xacml.util.FactoryException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import org.onap.policy.models.decisions.concepts.DecisionRequest;
import org.onap.policy.models.decisions.concepts.DecisionResponse;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeIdentifier;
import org.onap.policy.pdp.xacml.application.common.XacmlApplicationException;
import org.onap.policy.pdp.xacml.application.common.XacmlApplicationServiceProvider;
import org.onap.policy.pdp.xacml.application.common.XacmlPolicyUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class StdXacmlApplicationServiceProvider implements XacmlApplicationServiceProvider {
private static final Logger LOGGER = LoggerFactory.getLogger(StdXacmlApplicationServiceProvider.class);
private Path pathForData = null;
private Properties pdpProperties = null;
private PDPEngine pdpEngine = null;
public StdXacmlApplicationServiceProvider() {
super();
}
@Override
public String applicationName() {
return "Please Override";
}
@Override
public List<String> actionDecisionsSupported() {
return Collections.emptyList();
}
@Override
public void initialize(Path pathForData) throws XacmlApplicationException {
//
// Save our path
//
this.pathForData = pathForData;
LOGGER.info("New Path is {}", this.pathForData.toAbsolutePath());
//
// Ensure properties exist
//
Path propertiesPath = XacmlPolicyUtils.getPropertiesPath(pathForData);
if (! propertiesPath.toFile().exists()) {
LOGGER.info("Copying src/main/resources/xacml.properties to path");
//
// Properties do not exist, by default we will copy ours over
// from src/main/resources
//
try {
Files.copy(Paths.get("src/main/resources/xacml.properties"), propertiesPath);
} catch (IOException e) {
throw new XacmlApplicationException("Failed to copy xacml.propertis", e);
}
}
//
// Look for and load the properties object
//
try {
pdpProperties = XacmlPolicyUtils.loadXacmlProperties(XacmlPolicyUtils.getPropertiesPath(pathForData));
LOGGER.debug("{}", pdpProperties);
} catch (IOException e) {
throw new XacmlApplicationException("Failed to load xacml.propertis", e);
}
//
// Create an engine
//
createEngine(pdpProperties);
}
@Override
public List<ToscaPolicyTypeIdentifier> supportedPolicyTypes() {
return Collections.emptyList();
}
@Override
public boolean canSupportPolicyType(ToscaPolicyTypeIdentifier policyTypeId) {
return false;
}
@Override
public void loadPolicies(Map<String, Object> toscaPolicies) throws XacmlApplicationException {
throw new UnsupportedOperationException("Please override and implement loadPolicies");
}
@Override
public DecisionResponse makeDecision(DecisionRequest request) {
//
// We should have a standard error response to return
//
return null;
}
protected synchronized PDPEngine getEngine() {
return this.pdpEngine;
}
protected synchronized Properties getProperties() {
return new Properties(pdpProperties);
}
protected synchronized Path getDataPath() {
return pathForData;
}
/**
* Load properties from given file.
*
* @throws IOException If unable to read file
*/
protected synchronized Properties loadXacmlProperties() throws IOException {
LOGGER.debug("Loading xacml properties {}", pathForData);
try (InputStream is = Files.newInputStream(pathForData)) {
Properties properties = new Properties();
properties.load(is);
return properties;
}
}
/**
* Stores the XACML Properties to the given file location.
*
* @throws IOException If unable to store the file.
*/
protected synchronized void storeXacmlProperties() throws IOException {
try (OutputStream os = Files.newOutputStream(pathForData)) {
String strComments = "#";
pdpProperties.store(os, strComments);
}
}
/**
* Appends 'xacml.properties' to a root Path object
*
* @return Path to rootPath/xacml.properties file
*/
protected synchronized Path getPropertiesPath() {
return Paths.get(pathForData.toAbsolutePath().toString(), "xacml.properties");
}
/**
* Creates an instance of PDP engine given the Properties object.
*/
protected synchronized void createEngine(Properties properties) {
//
// Now initialize the XACML PDP Engine
//
try {
PDPEngineFactory factory = PDPEngineFactory.newInstance();
PDPEngine engine = factory.newEngine(properties);
if (engine != null) {
this.pdpEngine = engine;
this.pdpProperties = new Properties(properties);
}
} catch (FactoryException e) {
LOGGER.error("Failed to create XACML PDP Engine {}", e);
}
}
/**
* Make a decision call.
*
* @param request Incoming request object
* @return Response object
*/
protected synchronized Response xacmlDecision(Request request) {
//
// This is what we need to return
//
Response response = null;
//
// Track some timing
//
long timeStart = System.currentTimeMillis();
try {
response = this.pdpEngine.decide(request);
} catch (PDPException e) {
LOGGER.error("Xacml PDP Engine failed {}", e);
} finally {
//
// Track the end of timing
//
long timeEnd = System.currentTimeMillis();
LOGGER.info("Elapsed Time: {}ms", (timeEnd - timeStart));
}
return response;
}
}
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