applications/common/src/main/java/org/onap/policy/pdp/xacml/application/common/std/StdXacmlApplicationServiceProvider.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * ONAP
   4  * ================================================================================
   5  * Copyright (C) 2019-2020 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.pdp.xacml.application.common.std;
  24
  25 import com.att.research.xacml.api.Request;
  26 import com.att.research.xacml.api.Response;
  27 import com.att.research.xacml.api.pdp.PDPEngine;
  28 import com.att.research.xacml.api.pdp.PDPEngineFactory;
  29 import com.att.research.xacml.api.pdp.PDPException;
  30 import com.att.research.xacml.util.FactoryException;
  31 import com.att.research.xacml.util.XACMLPolicyWriter;
  32 import java.io.IOException;
  33 import java.nio.charset.StandardCharsets;
  34 import java.nio.file.Files;
  35 import java.nio.file.Path;
  36 import java.util.Collections;
  37 import java.util.HashMap;
  38 import java.util.List;
  39 import java.util.Map;
  40 import java.util.Properties;
  41 import lombok.Getter;
  42 import oasis.names.tc.xacml._3_0.core.schema.wd_17.PolicyType;
  43 import org.apache.commons.lang3.tuple.Pair;
  44 import org.onap.policy.common.endpoints.parameters.RestServerParameters;
  45 import org.onap.policy.models.decisions.concepts.DecisionRequest;
  46 import org.onap.policy.models.decisions.concepts.DecisionResponse;
  47 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
  48 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeIdentifier;
  49 import org.onap.policy.pdp.xacml.application.common.ToscaPolicyConversionException;
  50 import org.onap.policy.pdp.xacml.application.common.ToscaPolicyTranslator;
  51 import org.onap.policy.pdp.xacml.application.common.XacmlApplicationException;
  52 import org.onap.policy.pdp.xacml.application.common.XacmlApplicationServiceProvider;
  53 import org.onap.policy.pdp.xacml.application.common.XacmlPolicyUtils;
  54 import org.slf4j.Logger;
  55 import org.slf4j.LoggerFactory;
  56
  57 public abstract class StdXacmlApplicationServiceProvider implements XacmlApplicationServiceProvider {
  58
  59     private static final Logger LOGGER = LoggerFactory.getLogger(StdXacmlApplicationServiceProvider.class);
  60     private Path pathForData = null;
  61     @Getter
  62     private RestServerParameters policyApiParameters;
  63     private Properties pdpProperties = null;
  64     private PDPEngine pdpEngine = null;
  65     private Map<ToscaPolicy, Path> mapLoadedPolicies = new HashMap<>();
  66
  67     public StdXacmlApplicationServiceProvider() {
  68         super();
  69     }
  70
  71     @Override
  72     public String applicationName() {
  73         return "Please Override";
  74     }
  75
  76     @Override
  77     public List<String> actionDecisionsSupported() {
  78         return Collections.emptyList();
  79     }
  80
  81     @Override
  82     public void initialize(Path pathForData, RestServerParameters policyApiParameters)
  83             throws XacmlApplicationException {
  84         //
  85         // Save our path
  86         //
  87         this.pathForData = pathForData;
  88         LOGGER.info("New Path is {}", this.pathForData.toAbsolutePath());
  89         //
  90         // Save our params
  91         //
  92         this.policyApiParameters = policyApiParameters;
  93         //
  94         // Look for and load the properties object
  95         //
  96         try {
  97             pdpProperties = XacmlPolicyUtils.loadXacmlProperties(XacmlPolicyUtils.getPropertiesPath(pathForData));
  98             LOGGER.info("{}", pdpProperties);
  99         } catch (IOException e) {
 100             throw new XacmlApplicationException("Failed to load " + XacmlPolicyUtils.XACML_PROPERTY_FILE, e);
 101         }
 102         //
 103         // Create an engine
 104         //
 105         createEngine(pdpProperties);
 106     }
 107
 108     @Override
 109     public List<ToscaPolicyTypeIdentifier> supportedPolicyTypes() {
 110         throw new UnsupportedOperationException("Please override and implement supportedPolicyTypes");
 111     }
 112
 113     @Override
 114     public boolean canSupportPolicyType(ToscaPolicyTypeIdentifier policyTypeId) {
 115         throw new UnsupportedOperationException("Please override and implement canSupportPolicyType");
 116     }
 117
 118     @Override
 119     public synchronized void loadPolicy(ToscaPolicy toscaPolicy) throws XacmlApplicationException {
 120         try {
 121             //
 122             // Convert the policies first
 123             //
 124             PolicyType xacmlPolicy = this.getTranslator(toscaPolicy.getType()).convertPolicy(toscaPolicy);
 125             if (xacmlPolicy == null) {
 126                 throw new ToscaPolicyConversionException("Failed to convert policy");
 127             }
 128             //
 129             // Create a copy of the properties object
 130             //
 131             Properties newProperties = this.getProperties();
 132             //
 133             // Construct the filename
 134             //
 135             Path refPath = XacmlPolicyUtils.constructUniquePolicyFilename(xacmlPolicy, this.getDataPath());
 136             //
 137             // Write the policy to disk
 138             // Maybe check for an error
 139             //
 140             XACMLPolicyWriter.writePolicyFile(refPath, xacmlPolicy);
 141             if (LOGGER.isInfoEnabled()) {
 142                 LOGGER.info("Xacml Policy is {}{}", XacmlPolicyUtils.LINE_SEPARATOR,
 143                     new String(Files.readAllBytes(refPath), StandardCharsets.UTF_8));
 144             }
 145             //
 146             // Add root policy to properties object
 147             //
 148             XacmlPolicyUtils.addRootPolicy(newProperties, refPath);
 149             //
 150             // Write the properties to disk
 151             //
 152             XacmlPolicyUtils.storeXacmlProperties(newProperties,
 153                     XacmlPolicyUtils.getPropertiesPath(this.getDataPath()));
 154             //
 155             // Reload the engine
 156             //
 157             this.createEngine(newProperties);
 158             //
 159             // Save the properties
 160             //
 161             this.pdpProperties = newProperties;
 162             //
 163             // Save in our map
 164             //
 165             this.mapLoadedPolicies.put(toscaPolicy, refPath);
 166         } catch (IOException | ToscaPolicyConversionException e) {
 167             throw new XacmlApplicationException("loadPolicy failed", e);
 168         }
 169     }
 170
 171     @Override
 172     public synchronized boolean unloadPolicy(ToscaPolicy toscaPolicy) throws XacmlApplicationException {
 173         //
 174         // Find it in our map
 175         //
 176         Path refPolicy = this.mapLoadedPolicies.get(toscaPolicy);
 177         if (refPolicy == null) {
 178             LOGGER.error("Failed to find ToscaPolicy {} in our map size {}", toscaPolicy.getMetadata(),
 179                     this.mapLoadedPolicies.size());
 180             return false;
 181         }
 182         //
 183         // Create a copy of the properties object
 184         //
 185         Properties newProperties = this.getProperties();
 186         //
 187         // Remove it from the properties
 188         //
 189         XacmlPolicyUtils.removeRootPolicy(newProperties, refPolicy);
 190         //
 191         // We can delete the file
 192         //
 193         try {
 194             Files.delete(refPolicy);
 195         } catch (IOException e) {
 196             LOGGER.error("Failed to delete policy {} from disk {}", toscaPolicy.getMetadata(),
 197                     refPolicy.toAbsolutePath(), e);
 198         }
 199         //
 200         // Write the properties to disk
 201         //
 202         try {
 203             XacmlPolicyUtils.storeXacmlProperties(newProperties,
 204                     XacmlPolicyUtils.getPropertiesPath(this.getDataPath()));
 205         } catch (IOException e) {
 206             LOGGER.error("Failed to save the properties to disk {}", newProperties, e);
 207         }
 208         //
 209         // Reload the engine
 210         //
 211         this.createEngine(newProperties);
 212         //
 213         // Save the properties
 214         //
 215         this.pdpProperties = newProperties;
 216         //
 217         // Save in our map
 218         //
 219         if (this.mapLoadedPolicies.remove(toscaPolicy) == null) {
 220             LOGGER.error("Failed to remove toscaPolicy {} from internal map size {}", toscaPolicy.getMetadata(),
 221                     this.mapLoadedPolicies.size());
 222         }
 223         //
 224         // Not sure if any of the errors above warrant returning false
 225         //
 226         return true;
 227     }
 228
 229     @Override
 230     public Pair<DecisionResponse, Response> makeDecision(DecisionRequest request,
 231             Map<String, String[]> requestQueryParams) {
 232         //
 233         // Convert to a XacmlRequest
 234         //
 235         Request xacmlRequest = this.getTranslator().convertRequest(request);
 236         //
 237         // Now get a decision
 238         //
 239         Response xacmlResponse = this.xacmlDecision(xacmlRequest);
 240         //
 241         // Convert to a DecisionResponse
 242         //
 243         return Pair.of(this.getTranslator().convertResponse(xacmlResponse), xacmlResponse);
 244     }
 245
 246     protected abstract ToscaPolicyTranslator getTranslator(String type);
 247
 248     protected ToscaPolicyTranslator getTranslator() {
 249         return this.getTranslator("");
 250     }
 251
 252     protected synchronized PDPEngine getEngine() {
 253         return this.pdpEngine;
 254     }
 255
 256     protected synchronized Properties getProperties() {
 257         Properties newProperties = new Properties();
 258         newProperties.putAll(pdpProperties);
 259         return newProperties;
 260     }
 261
 262     protected synchronized Path getDataPath() {
 263         return pathForData;
 264     }
 265
 266     /**
 267      * Creates an instance of PDP engine given the Properties object.
 268      */
 269     protected synchronized void createEngine(Properties properties) {
 270         //
 271         // Now initialize the XACML PDP Engine
 272         //
 273         try {
 274             PDPEngineFactory factory = getPdpEngineFactory();
 275             PDPEngine engine = factory.newEngine(properties);
 276             if (engine != null) {
 277                 this.pdpEngine = engine;
 278             }
 279         } catch (FactoryException e) {
 280             LOGGER.error("Failed to create XACML PDP Engine", e);
 281         }
 282     }
 283
 284     /**
 285      * Make a decision call.
 286      *
 287      * @param request Incoming request object
 288      * @return Response object
 289      */
 290     protected synchronized Response xacmlDecision(Request request) {
 291         //
 292         // This is what we need to return
 293         //
 294         Response response = null;
 295         //
 296         // Track some timing
 297         //
 298         long timeStart = System.currentTimeMillis();
 299         try {
 300             response = this.pdpEngine.decide(request);
 301         } catch (PDPException e) {
 302             LOGGER.error("Xacml PDP Engine decide failed", e);
 303         } finally {
 304             //
 305             // Track the end of timing
 306             //
 307             long timeEnd = System.currentTimeMillis();
 308             LOGGER.info("Elapsed Time: {}ms", (timeEnd - timeStart));
 309         }
 310         return response;
 311     }
 312
 313     // these may be overridden by junit tests
 314
 315     protected PDPEngineFactory getPdpEngineFactory() throws FactoryException {
 316         return PDPEngineFactory.newInstance();
 317     }
 318 }