/*
    * This file is part of dependency-check-core.
    *
    * 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.
   *
   * Copyright (c) 2012 Jeremy Long. All Rights Reserved.
   */
  package org.owasp.dependencycheck.analyzer;
  
  import java.io.IOException;
  import java.sql.SQLException;
  import java.util.List;
  import org.owasp.dependencycheck.Engine;
  import org.owasp.dependencycheck.analyzer.exception.AnalysisException;
  import org.owasp.dependencycheck.data.nvdcve.CveDB;
  import org.owasp.dependencycheck.data.nvdcve.DatabaseException;
  import org.owasp.dependencycheck.dependency.Dependency;
  import org.owasp.dependencycheck.dependency.Identifier;
  import org.owasp.dependencycheck.dependency.Vulnerability;
  import org.owasp.dependencycheck.exception.InitializationException;
  import org.slf4j.LoggerFactory;
  
  /**
   * NvdCveAnalyzer is a utility class that takes a project dependency and attempts to discern if there is an associated
   * CVEs. It uses the the identifiers found by other analyzers to lookup the CVE data.
   *
   * @author Jeremy Long
   */
  public class NvdCveAnalyzer extends AbstractAnalyzer {
      /**
       * The Logger for use throughout the class
       */
      private static final org.slf4j.Logger LOGGER = LoggerFactory.getLogger(NvdCveAnalyzer.class);
      /**
       * The maximum number of query results to return.
       */
      static final int MAX_QUERY_RESULTS = 100;
      /**
       * The CVE Index.
       */
      private CveDB cveDB;
  
      /**
       * Opens the data source.
       *
       * @throws SQLException thrown when there is a SQL Exception
       * @throws IOException thrown when there is an IO Exception
       * @throws DatabaseException thrown when there is a database exceptions
       * @throws ClassNotFoundException thrown if the h2 database driver cannot be loaded
       */
      public void open() throws SQLException, IOException, DatabaseException, ClassNotFoundException {
          cveDB = new CveDB();
          cveDB.open();
      }
  
      /**
       * Closes the data source.
       */
      @Override
      public void close() {
          cveDB.close();
          cveDB = null;
      }
  
      /**
       * Returns the status of the data source - is the database open.
       *
       * @return true or false.
       */
      public boolean isOpen() {
          return cveDB != null;
      }
  
      /**
       * Ensures that the CVE Database is closed.
       *
       * @throws Throwable an exception raised by this method
       */
      @Override
      protected void finalize() throws Throwable {
          super.finalize();
          if (isOpen()) {
              close();
          }
      }
  
      /**
       * Analyzes a dependency and attempts to determine if there are any CPE identifiers for this dependency.
       *
      * @param dependency The Dependency to analyze
      * @param engine The analysis engine
      * @throws AnalysisException thrown if there is an issue analyzing the dependency
      */
     @Override
     public void analyze(Dependency dependency, Engine engine) throws AnalysisException {
         for (Identifier id : dependency.getIdentifiers()) {
             if ("cpe".equals(id.getType())) {
                 try {
                     final String value = id.getValue();
                     final List<Vulnerability> vulns = cveDB.getVulnerabilities(value);
                     dependency.getVulnerabilities().addAll(vulns);
                 } catch (DatabaseException ex) {
                     throw new AnalysisException(ex);
                 }
             }
         }
         for (Identifier id : dependency.getSuppressedIdentifiers()) {
             if ("cpe".equals(id.getType())) {
                 try {
                     final String value = id.getValue();
                     final List<Vulnerability> vulns = cveDB.getVulnerabilities(value);
                     dependency.getSuppressedVulnerabilities().addAll(vulns);
                 } catch (DatabaseException ex) {
                     throw new AnalysisException(ex);
                 }
             }
         }
     }
 
     /**
      * Returns the name of this analyzer.
      *
      * @return the name of this analyzer.
      */
     @Override
     public String getName() {
         return "NVD CVE Analyzer";
     }
 
     /**
      * Returns the analysis phase that this analyzer should run in.
      *
      * @return the analysis phase that this analyzer should run in.
      */
     @Override
     public AnalysisPhase getAnalysisPhase() {
         return AnalysisPhase.FINDING_ANALYSIS;
     }
 
     /**
      * Opens the database used to gather NVD CVE data.
      *
      * @throws InitializationException is thrown if there is an issue opening the index.
      */
     @Override
     public void initialize() throws InitializationException {
         try {
             this.open();
         } catch (SQLException ex) {
             LOGGER.debug("SQL Exception initializing NvdCveAnalyzer", ex);
             throw new InitializationException(ex);
         } catch (IOException ex) {
             LOGGER.debug("IO Exception initializing NvdCveAnalyzer", ex);
             throw new InitializationException(ex);
         } catch (DatabaseException ex) {
             LOGGER.debug("Database Exception initializing NvdCveAnalyzer", ex);
             throw new InitializationException(ex);
         } catch (ClassNotFoundException ex) {
             LOGGER.debug("Exception initializing NvdCveAnalyzer", ex);
             throw new InitializationException(ex);
         }
     }
 }