/*

  * 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) 2013 Jeremy Long. All Rights Reserved.

  */

 package org.owasp.dependencycheck.analyzer;

 import java.io.File;

 import java.io.IOException;

 import java.net.MalformedURLException;

 import java.net.URL;

 import java.util.List;

 import java.util.Set;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import java.util.regex.Pattern;

 import org.owasp.dependencycheck.suppression.SuppressionParseException;

 import org.owasp.dependencycheck.suppression.SuppressionParser;

 import org.owasp.dependencycheck.suppression.SuppressionRule;

 import org.owasp.dependencycheck.utils.DownloadFailedException;

 import org.owasp.dependencycheck.utils.Downloader;

 import org.owasp.dependencycheck.utils.FileUtils;

 import org.owasp.dependencycheck.utils.Settings;

 /**

  * Abstract base suppression analyzer that contains methods for parsing the suppression xml file.

  *

  * @author Jeremy Long <jeremy.long@owasp.org>

  */

 public abstract class AbstractSuppressionAnalyzer extends AbstractAnalyzer {

     //<editor-fold defaultstate="collapsed" desc="All standard implementation details of Analyzer">

     /**

      * Returns a list of file EXTENSIONS supported by this analyzer.

      *

      * @return a list of file EXTENSIONS supported by this analyzer.

      */

     public Set<String> getSupportedExtensions() {

         return null;

     }

     //</editor-fold>

     /**

      * The initialize method loads the suppression XML file.

      *

      * @throws Exception thrown if there is an exception

      */

     @Override

     public void initialize() throws Exception {

         super.initialize();

         loadSuppressionData();

     }

     /**

      * The list of suppression rules

      */

     private List<SuppressionRule> rules;

     /**

      * Get the value of rules.

      *

      * @return the value of rules

      */

     public List<SuppressionRule> getRules() {

         return rules;

     }

     /**

      * Set the value of rules.

      *

      * @param rules new value of rules

      */

     public void setRules(List<SuppressionRule> rules) {

         this.rules = rules;

     }

     /**

      * Loads the suppression rules file.

      *

      * @throws SuppressionParseException thrown if the XML cannot be parsed.

      */

     private void loadSuppressionData() throws SuppressionParseException {

         final String suppressionFilePath = Settings.getString(Settings.KEYS.SUPPRESSION_FILE);

         if (suppressionFilePath == null) {

             return;

         }

         File file = null;

         boolean deleteTempFile = false;

         try {

             final Pattern uriRx = Pattern.compile("^(https?|file)\\:.*", Pattern.CASE_INSENSITIVE);

             if (uriRx.matcher(suppressionFilePath).matches()) {

                 deleteTempFile = true;

                 file = FileUtils.getTempFile("suppression", "xml");

                 final URL url = new URL(suppressionFilePath);

                 try {

                     Downloader.fetchFile(url, file, false);

                 } catch (DownloadFailedException ex) {

                     Downloader.fetchFile(url, file, true);

                 }

             } else {

                 file = new File(suppressionFilePath);

             }

             if (file != null) {

                 final SuppressionParser parser = new SuppressionParser();

                 try {

                     rules = parser.parseSuppressionRules(file);

                     Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.FINE, rules.size() + " suppression rules were loaded.");

                 } catch (SuppressionParseException ex) {

                     final String msg = String.format("Unable to parse suppression xml file '%s'", file.getPath());

                     Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.WARNING, msg);

                     Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.WARNING, ex.getMessage());

                     Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.FINE, "", ex);

                     throw ex;

                 }

             }

         } catch (DownloadFailedException ex) {

             Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.WARNING,

                     "Unable to fetch the configured suppression file");

             Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.FINE, "", ex);

             throw new SuppressionParseException("Unable to fetch the configured suppression file", ex);

         } catch (MalformedURLException ex) {

             Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.WARNING,

                     "Configured suppression file has an invalid URL");

             Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.FINE, "", ex);

             throw new SuppressionParseException("Configured suppression file has an invalid URL", ex);

         } catch (IOException ex) {

             Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.WARNING,

                     "Unable to create temp file for suppressions");

             Logger.getLogger(AbstractSuppressionAnalyzer.class.getName()).log(Level.FINE, "", ex);

             throw new SuppressionParseException("Unable to create temp file for suppressions", ex);

         } finally {

             if (deleteTempFile && file != null) {

                 FileUtils.delete(file);

             }

         }

     }

 }