package org.apache.maven.plugin.gpg;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.util.List;
  
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.logging.Log;
  import org.apache.maven.project.MavenProject;
  
  /**
   * A base class for all classes that implements signing of files.
   *
   * @author Dennis Lundberg
   * @since 1.5
   */
  public abstract class AbstractGpgSigner
  {
      public static final String SIGNATURE_EXTENSION = ".asc";
  
      protected boolean useAgent;
  
      protected boolean isInteractive = true;
  
      protected boolean defaultKeyring = true;
  
      protected String keyname;
  
      private Log log;
  
      protected String passphrase;
  
      private File outputDir;
  
      private File buildDir;
  
      private File baseDir;
  
      protected File homeDir;
  
      protected String secretKeyring;
  
      protected String publicKeyring;
  
      protected String lockMode;
  
      protected List<String> args;
  
      public Log getLog()
      {
          return log;
      }
  
      public void setArgs( List<String> args )
      {
          this.args = args;
      }
  
      public void setInteractive( boolean b )
      {
          isInteractive = b;
      }
  
      public void setLockMode( String lockMode )
      {
          this.lockMode = lockMode;
      }
  
      public void setUseAgent( boolean b )
      {
          useAgent = b;
      }
  
      public void setDefaultKeyring( boolean enabled )
      {
          defaultKeyring = enabled;
     }
 
     public void setKeyName( String s )
     {
         keyname = s;
     }
 
     public void setLog( Log log )
     {
         this.log = log;
     }
 
     public void setPassPhrase( String s )
     {
         passphrase = s;
     }
 
     public void setOutputDirectory( File out )
     {
         outputDir = out;
     }
 
     public void setBuildDirectory( File out )
     {
         buildDir = out;
     }
 
     public void setBaseDirectory( File out )
     {
         baseDir = out;
     }
 
     public void setHomeDirectory( File homeDirectory )
     {
         homeDir = homeDirectory;
     }
 
     public void setSecretKeyring( String path )
     {
         secretKeyring = path;
     }
 
     public void setPublicKeyring( String path )
     {
         publicKeyring = path;
     }
 
     /**
      * Create a detached signature file for the provided file.
      *
      * @param file The file to sign
      * @return A reference to the generated signature file
      * @throws org.apache.maven.plugin.MojoExecutionException
      */
     public File generateSignatureForArtifact( File file )
         throws MojoExecutionException
     {
         // ----------------------------------------------------------------------------
         // Set up the file and directory for the signature file
         // ----------------------------------------------------------------------------
 
         File signature = new File( file + SIGNATURE_EXTENSION );
 
         boolean isInBuildDir = false;
         if ( buildDir != null )
         {
             File parent = signature.getParentFile();
             if ( buildDir.equals( parent ) )
             {
                 isInBuildDir = true;
             }
         }
         if ( !isInBuildDir && outputDir != null )
         {
             String fileDirectory = "";
             File signatureDirectory = signature;
 
             while ( ( signatureDirectory = signatureDirectory.getParentFile() ) != null )
             {
                 if ( !signatureDirectory.equals( baseDir ) )
                 {
                     fileDirectory = signatureDirectory.getName() + File.separatorChar + fileDirectory;
                 }
                 else
                 {
                     break;
                 }
             }
             signatureDirectory = new File( outputDir, fileDirectory );
             if ( !signatureDirectory.exists() )
             {
                 signatureDirectory.mkdirs();
             }
             signature = new File( signatureDirectory, file.getName() + SIGNATURE_EXTENSION );
         }
 
         if ( signature.exists() )
         {
             signature.delete();
         }
 
         // ----------------------------------------------------------------------------
         // Generate the signature file
         // ----------------------------------------------------------------------------
 
         generateSignatureForFile( file, signature );
 
         return signature;
     }
 
     /**
      * Generate the detached signature file for the provided file.
      *
      * @param file The file to sign
      * @param signature The file in which the generate signature will be put
      * @throws MojoExecutionException
      */
     protected abstract void generateSignatureForFile( File file, File signature )
         throws MojoExecutionException;
 
     private MavenProject findReactorProject( MavenProject prj )
     {
         if ( prj.getParent() != null && prj.getParent().getBasedir() != null && prj.getParent().getBasedir().exists() )
         {
             return findReactorProject( prj.getParent() );
         }
         return prj;
     }
 
     public String getPassphrase( MavenProject project )
         throws IOException
     {
         String pass = null;
 
         if ( project != null )
         {
             pass = project.getProperties().getProperty( "gpg.passphrase" );
             if ( pass == null )
             {
                 MavenProject prj2 = findReactorProject( project );
                 pass = prj2.getProperties().getProperty( "gpg.passphrase" );
             }
         }
         if ( pass == null )
         {
             pass = readPassword( "GPG Passphrase: " );
         }
         if ( project != null )
         {
             findReactorProject( project ).getProperties().setProperty( "gpg.passphrase", pass );
         }
         return pass;
     }
 
     private String readPassword( String prompt )
         throws IOException
     {
         try
         {
             return readPasswordJava16( prompt );
         }
         catch ( IOException e )
         {
             throw e;
         }
         catch ( NoSuchMethodException e )
         {
             return readPasswordJava15( prompt );
         }
         catch ( IllegalAccessException e )
         {
             return readPasswordJava15( prompt );
         }
         catch ( InvocationTargetException e )
         {
             return readPasswordJava15( prompt );
         }
     }
 
     private String readPasswordJava16( String prompt )
         throws IOException, NoSuchMethodException, InvocationTargetException, IllegalAccessException
     {
         Method consoleMethod = System.class.getMethod( "console" );
         Object console = consoleMethod.invoke( null );
         if ( console == null )
         {
             throw new IllegalAccessException( "console was null" );
         }
         Method readPasswordMethod = console.getClass().getMethod( "readPassword", String.class, Object[].class );
         return new String( (char[]) readPasswordMethod.invoke( console, prompt, null ) );
     }
 
     private String readPasswordJava15( String prompt )
         throws IOException
     {
         BufferedReader in = new BufferedReader( new InputStreamReader( System.in ) );
         while ( System.in.available() != 0 )
         {
             // there's some junk already on the input stream, consume it
             // so we can get the real passphrase
             System.in.read();
         }
 
         System.out.print( prompt );
         System.out.print( ' ' );
         MaskingThread thread = new MaskingThread();
         thread.start();
         try
         {
 
             return in.readLine();
         }
         finally
         {
             // stop masking
             thread.stopMasking();
 
         }
     }
 
     // based on ideas from http://java.sun.com/developer/technicalArticles/Security/pwordmask/
     class MaskingThread
         extends Thread
     {
         private volatile boolean stop;
 
         /**
          * Begin masking until asked to stop.
          */
         public void run()
         {
             // this needs to be high priority to make sure the characters don't
             // really get to the screen.
 
             int priority = Thread.currentThread().getPriority();
             Thread.currentThread().setPriority( Thread.MAX_PRIORITY );
 
             try
             {
                 stop = false;
                 while ( !stop )
                 {
                     // print a backspace + * to overwrite anything they type
                     System.out.print( "\010*" );
                     try
                     {
                         // attempt masking at this rate
                         Thread.sleep( 1 );
                     }
                     catch ( InterruptedException iex )
                     {
                         Thread.currentThread().interrupt();
                         return;
                     }
                 }
             }
             finally
             {
                 // restore the original priority
                 Thread.currentThread().setPriority( priority );
             }
         }
 
         /**
          * Instruct the thread to stop masking.
          */
         public void stopMasking()
         {
             this.stop = true;
         }
     }
 }