Merge "Upgrade to release 3.0.0 parent"
[policy/xacml-pdp.git] / applications / guard / src / main / java / org / onap / policy / xacml / pdp / application / guard / CoordinationGuardTranslator.java
1 /*-
2  * ============LICENSE_START=======================================================
3  * ONAP
4  * ================================================================================
5  * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
6  * ================================================================================
7  * Licensed under the Apache License, Version 2.0 (the "License");
8  * you may not use this file except in compliance with the License.
9  * You may obtain a copy of the License at
10  *
11  *      http://www.apache.org/licenses/LICENSE-2.0
12  *
13  * Unless required by applicable law or agreed to in writing, software
14  * distributed under the License is distributed on an "AS IS" BASIS,
15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16  * See the License for the specific language governing permissions and
17  * limitations under the License.
18  *
19  * SPDX-License-Identifier: Apache-2.0
20  * ============LICENSE_END=========================================================
21  */
22
23 package org.onap.policy.xacml.pdp.application.guard;
24
25 import com.att.research.xacml.api.Request;
26 import com.att.research.xacml.api.Response;
27 import com.att.research.xacml.util.XACMLPolicyScanner;
28
29 import java.io.ByteArrayInputStream;
30 import java.io.File;
31 import java.io.FileInputStream;
32 import java.io.IOException;
33 import java.io.InputStream;
34 import java.nio.charset.StandardCharsets;
35 import java.nio.file.Files;
36 import java.nio.file.Paths;
37 import java.util.List;
38 import java.util.Map;
39 import java.util.UUID;
40 import java.util.stream.Collectors;
41 import java.util.stream.Stream;
42
43 import oasis.names.tc.xacml._3_0.core.schema.wd_17.PolicyType;
44
45 import org.apache.commons.io.IOUtils;
46 import org.onap.policy.models.decisions.concepts.DecisionRequest;
47 import org.onap.policy.models.decisions.concepts.DecisionResponse;
48 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
49 import org.onap.policy.pdp.xacml.application.common.ToscaPolicyConversionException;
50 import org.onap.policy.pdp.xacml.application.common.ToscaPolicyTranslator;
51 import org.slf4j.Logger;
52 import org.slf4j.LoggerFactory;
53 import org.yaml.snakeyaml.Yaml;
54 import org.yaml.snakeyaml.constructor.Constructor;
55
56 public class CoordinationGuardTranslator implements ToscaPolicyTranslator {
57
58     private static final Logger LOGGER = LoggerFactory.getLogger(CoordinationGuardTranslator.class);
59
60     public CoordinationGuardTranslator() {
61         super();
62     }
63
64     @Override
65     public PolicyType convertPolicy(ToscaPolicy toscaPolicy) throws ToscaPolicyConversionException {
66         LOGGER.debug("Using CoordinationGuardTranslator.convertPolicy");
67         //
68         // Policy name should be at the root
69         //
70         String type = toscaPolicy.getType();
71         String coordinationFunctionPath = "src/main/resources/coordination/function";
72         Map<String, Object> policyProps = toscaPolicy.getProperties();
73         LOGGER.debug("path = {}", coordinationFunctionPath);
74         LOGGER.debug("props = {}", policyProps);
75         @SuppressWarnings("unchecked")
76         List<String> controlLoop = (List<String>) policyProps.get("controlLoop");
77         CoordinationDirective cd = new CoordinationDirective();
78         cd.setCoordinationFunction(type);
79         cd.setControlLoop(controlLoop);
80         LOGGER.debug("CoordinationDirective = {}", cd);
81         //
82         // Generate the xacml policy as a string
83         //
84         String xacmlStr = generateXacmlFromCoordinationDirective(cd, coordinationFunctionPath);
85         LOGGER.debug("xacmlStr\n{}", xacmlStr);
86         //
87         // Scan the string and convert to PoilcyType
88         //
89         try (InputStream is = new ByteArrayInputStream(xacmlStr.getBytes(StandardCharsets.UTF_8))) {
90             return (PolicyType) XACMLPolicyScanner.readPolicy(is);
91         } catch (IOException e) {
92             throw new ToscaPolicyConversionException("Failed to read policy", e);
93         }
94     }
95
96     @Override
97     public Request convertRequest(DecisionRequest request) {
98         LOGGER.info("this convertRequest shouldn't be used");
99         return null;
100     }
101
102     @Override
103     public DecisionResponse convertResponse(Response xacmlResponse) {
104         LOGGER.info("this convertResponse shouldn't be used");
105         return null;
106     }
107
108     /**
109      * Load YAML coordination directive.
110      *
111      * @param directiveFilename yaml directive file to load
112      * @return the CoordinationDirective
113      */
114     public static CoordinationDirective loadCoordinationDirectiveFromFile(String directiveFilename) {
115         try (InputStream is = new FileInputStream(new File(directiveFilename))) {
116             String contents = IOUtils.toString(is, StandardCharsets.UTF_8);
117             //
118             // Read the yaml into our Java Object
119             //
120             Yaml yaml = new Yaml(new Constructor(CoordinationDirective.class));
121             Object obj = yaml.load(contents);
122             LOGGER.debug(contents);
123             return (CoordinationDirective) obj;
124         } catch (IOException e) {
125             LOGGER.error("Error while loading YAML coordination directive", e);
126         }
127         return null;
128     }
129
130     /**
131      * Generate Xacml rule implementing specified CoordinationDirective.
132      *
133      * @param cd the CoordinationDirective
134      * @param protoDir the directory containing Xacml implementation prototypes
135      * @return the generated Xacml policy
136      */
137     public static String generateXacmlFromCoordinationDirective(CoordinationDirective cd,
138                                                                 String protoDir) throws ToscaPolicyConversionException {
139         /*
140          * Determine file names
141          */
142         String xacmlProtoFilename = protoDir + File.separator + cd.getCoordinationFunction() + ".xml";
143         LOGGER.debug("xacmlProtoFilename={}", xacmlProtoFilename);
144         /*
145          * Values to be used for placeholders
146          */
147         final String uniqueId = UUID.randomUUID().toString();
148         final String cLOne = cd.getControlLoop(0);
149         final String cLTwo = cd.getControlLoop(1);
150         /*
151          * Replace function placeholders with appropriate values
152          */
153         try (Stream<String> stream = Files.lines(Paths.get(xacmlProtoFilename))) {
154             return stream.map(s -> s.replaceAll("UNIQUE_ID", uniqueId))
155                 .map(s -> s.replaceAll("CONTROL_LOOP_ONE", cLOne))
156                 .map(s -> s.replaceAll("CONTROL_LOOP_TWO", cLTwo))
157                 .collect(Collectors.joining(System.lineSeparator()));
158         } catch (IOException e) {
159             throw new
160                 ToscaPolicyConversionException("Error while generating XACML policy for coordination directive", e);
161         }
162     }
163
164 }