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/*-
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019-2020 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.xacml.pdp.application.guard;
import com.att.research.xacml.api.Request;
import com.att.research.xacml.api.Response;
import com.att.research.xacml.util.XACMLPolicyScanner;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import oasis.names.tc.xacml._3_0.core.schema.wd_17.PolicyType;
import org.apache.commons.io.IOUtils;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardYamlCoder;
import org.onap.policy.models.decisions.concepts.DecisionRequest;
import org.onap.policy.models.decisions.concepts.DecisionResponse;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
import org.onap.policy.pdp.xacml.application.common.ToscaPolicyConversionException;
import org.onap.policy.pdp.xacml.application.common.ToscaPolicyTranslator;
import org.onap.policy.pdp.xacml.application.common.XacmlPolicyUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CoordinationGuardTranslator implements ToscaPolicyTranslator {
private static final Logger LOGGER = LoggerFactory.getLogger(CoordinationGuardTranslator.class);
public CoordinationGuardTranslator() {
super();
}
@Override
public PolicyType convertPolicy(ToscaPolicy toscaPolicy) throws ToscaPolicyConversionException {
LOGGER.debug("Using CoordinationGuardTranslator.convertPolicy");
//
// Policy name should be at the root
//
String type = toscaPolicy.getType();
String coordinationFunctionPath = "src/main/resources/coordination/function";
Map<String, Object> policyProps = toscaPolicy.getProperties();
LOGGER.debug("path = {}", coordinationFunctionPath);
LOGGER.debug("props = {}", policyProps);
@SuppressWarnings("unchecked")
List<String> controlLoop = (List<String>) policyProps.get("controlLoop");
CoordinationDirective cd = new CoordinationDirective();
cd.setCoordinationFunction(type);
cd.setControlLoop(controlLoop);
LOGGER.debug("CoordinationDirective = {}", cd);
//
// Generate the xacml policy as a string
//
String xacmlStr = generateXacmlFromCoordinationDirective(cd, coordinationFunctionPath);
LOGGER.debug("xacmlStr\n{}", xacmlStr);
//
// Scan the string and convert to PoilcyType
//
try (InputStream is = new ByteArrayInputStream(xacmlStr.getBytes(StandardCharsets.UTF_8))) {
return (PolicyType) XACMLPolicyScanner.readPolicy(is);
} catch (IOException e) {
throw new ToscaPolicyConversionException("Failed to read policy", e);
}
}
/**
* This function is not used for CLC instead
* the one in LegacyGuardTranslator is used.
*/
@Override
public Request convertRequest(DecisionRequest request) throws ToscaPolicyConversionException {
throw new ToscaPolicyConversionException("this convertRequest shouldn't be used");
}
/**
* This function is not used for CLC instead
* the one in LegacyGuardTranslator is used.
*/
@Override
public DecisionResponse convertResponse(Response xacmlResponse) {
LOGGER.info("this convertResponse shouldn't be used");
return null;
}
/**
* Load YAML coordination directive.
*
* @param directiveFilename yaml directive file to load
* @return the CoordinationDirective
*/
public static CoordinationDirective loadCoordinationDirectiveFromFile(
String directiveFilename) {
try (InputStream is = new FileInputStream(new File(directiveFilename))) {
String contents = IOUtils.toString(is, StandardCharsets.UTF_8);
//
// Read the yaml into our Java Object
//
CoordinationDirective obj =
new StandardYamlCoder().decode(contents, CoordinationDirective.class);
LOGGER.debug(contents);
return obj;
} catch (IOException | CoderException e) {
LOGGER.error("Error while loading YAML coordination directive", e);
}
return null;
}
/**
* Generate Xacml rule implementing specified CoordinationDirective.
*
* @param cd the CoordinationDirective
* @param protoDir the directory containing Xacml implementation prototypes
* @return the generated Xacml policy
*/
public static String generateXacmlFromCoordinationDirective(CoordinationDirective cd,
String protoDir) throws ToscaPolicyConversionException {
/*
* Determine file names
*/
String xacmlProtoFilename =
protoDir + File.separator + cd.getCoordinationFunction() + ".xml";
LOGGER.debug("xacmlProtoFilename={}", xacmlProtoFilename);
/*
* Values to be used for placeholders
*/
final String uniqueId = UUID.randomUUID().toString();
final String cLOne = cd.getControlLoop(0);
final String cLTwo = cd.getControlLoop(1);
/*
* Replace function placeholders with appropriate values
*/
try (Stream<String> stream = Files.lines(Paths.get(xacmlProtoFilename))) {
return stream.map(s -> s.replace("UNIQUE_ID", uniqueId))
.map(s -> s.replace("CONTROL_LOOP_ONE", cLOne))
.map(s -> s.replace("CONTROL_LOOP_TWO", cLTwo))
.collect(Collectors.joining(XacmlPolicyUtils.LINE_SEPARATOR));
} catch (IOException e) {
throw new ToscaPolicyConversionException(
"Error while generating XACML policy for coordination directive", e);
}
}
}
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