/*

  * 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) 2014 Jeremy Long. All Rights Reserved.

  */

 package org.owasp.dependencycheck.analyzer;

 import java.io.BufferedReader;

 import java.io.File;

 import java.io.FileNotFoundException;

 import java.io.FileReader;

 import java.io.IOException;

 import java.util.Set;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import java.util.regex.Pattern;

 import org.owasp.dependencycheck.Engine;

 import org.owasp.dependencycheck.analyzer.exception.AnalysisException;

 import org.owasp.dependencycheck.dependency.Dependency;

 /**

  *

  * Used to analyze a JavaScript file to gather information to aid in identification of a CPE identifier.

  *

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

  */

 public class JavaScriptAnalyzer extends AbstractAnalyzer implements Analyzer {

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

     /**

      * The name of the analyzer.

      */

     private static final String ANALYZER_NAME = "JavaScript Analyzer";

     /**

      * The phase that this analyzer is intended to run in.

      */

     private static final AnalysisPhase ANALYSIS_PHASE = AnalysisPhase.INFORMATION_COLLECTION;

     /**

      * The set of file extensions supported by this analyzer.

      */

     private static final Set<String> EXTENSIONS = newHashSet("js");

     /**

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

      *

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

      */

     @Override

     public Set<String> getSupportedExtensions() {

         return EXTENSIONS;

     }

     /**

      * Returns the name of the analyzer.

      *

      * @return the name of the analyzer.

      */

     @Override

     public String getName() {

         return ANALYZER_NAME;

     }

     /**

      * Returns whether or not this analyzer can process the given extension.

      *

      * @param extension the file extension to test for support.

      * @return whether or not the specified file extension is supported by this analyzer.

      */

     @Override

     public boolean supportsExtension(String extension) {

         return EXTENSIONS.contains(extension);

     }

     /**

      * Returns the phase that the analyzer is intended to run in.

      *

      * @return the phase that the analyzer is intended to run in.

      */

     @Override

     public AnalysisPhase getAnalysisPhase() {

         return ANALYSIS_PHASE;

     }

     //</editor-fold>

     /**

      * Loads a specified JavaScript file and collects information from the copyright information contained within.

      *

      * @param dependency the dependency to analyze.

      * @param engine the engine that is scanning the dependencies

      * @throws AnalysisException is thrown if there is an error reading the JavaScript file.

      */

     @Override

     public void analyze(Dependency dependency, Engine engine) throws AnalysisException {

         BufferedReader fin = null;;

         try {

             //  /\*([^\*][^/]|[\r\n\f])+?\*/

             final Pattern extractComments = Pattern.compile("(/\\*([^*]|[\\r\\n]|(\\*+([^*/]|[\\r\\n])))*\\*+/)|(//.*)", Pattern.MULTILINE);

             File file = dependency.getActualFile();

             fin = new BufferedReader(new FileReader(file));

             StringBuilder sb = new StringBuilder(2000);

             String text;

             while ((text = fin.readLine()) != null) {

                 sb.append(text);

             }

         } catch (FileNotFoundException ex) {

             final String msg = String.format("Dependency file not found: '%s'", dependency.getActualFilePath());

             throw new AnalysisException(msg, ex);

         } catch (IOException ex) {

             Logger.getLogger(JavaScriptAnalyzer.class.getName()).log(Level.SEVERE, null, ex);

         } finally {

             if (fin != null) {

                 try {

                     fin.close();

                 } catch (IOException ex) {

                     Logger.getLogger(JavaScriptAnalyzer.class.getName()).log(Level.FINEST, null, ex);

                 }

             }

         }

     }

 }