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/*-
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019-2021 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.coordination;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.UUID;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;
public final class Util {
private static final Logger logger = LoggerFactory.getLogger(Util.class);
private Util() {
super();
}
/**
* Load YAML coordination directive.
*
* @param directiveFilename yaml directive file to load
* @return the CoordinationDirective
*/
public static CoordinationDirective loadCoordinationDirectiveFromFile(String directiveFilename) {
try (var is = new FileInputStream(new File(directiveFilename))) {
var contents = IOUtils.toString(is, StandardCharsets.UTF_8);
//
// Read the yaml into our Java Object
//
var yaml = new Yaml(new Constructor(CoordinationDirective.class));
Object obj = yaml.load(contents);
logger.debug(contents);
return (CoordinationDirective) obj;
} catch (IOException 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) {
/*
* Determine file names
*/
String xacmlProtoFilename = protoDir + File.separator + cd.getCoordinationFunction() + ".xml";
logger.debug("xacmlProtoFilename={}", xacmlProtoFilename);
/*
* Values to be used for placeholders
*/
final var uniqueId = UUID.randomUUID().toString();
final String cLOne = cd.getControlLoop(0);
final String cLTwo = cd.getControlLoop(1);
/*
* Replace prototype placeholders with appropriate values
*/
String xacmlPolicy = null;
try (Stream<String> stream = Files.lines(Paths.get(xacmlProtoFilename))) {
xacmlPolicy = 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(System.lineSeparator()));
} catch (IOException e) {
logger.error("Error while generating XACML policy for coordination directive", e);
}
return xacmlPolicy;
}
}
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