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.ByteArrayInputStream;

 import java.io.File;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.InputStreamReader;

 import org.apache.maven.plugin.MojoExecutionException;

 import org.apache.maven.project.MavenProject;

 import org.codehaus.plexus.util.Os;

 import org.codehaus.plexus.util.cli.CommandLineException;

 import org.codehaus.plexus.util.cli.CommandLineUtils;

 import org.codehaus.plexus.util.cli.Commandline;

 import org.codehaus.plexus.util.cli.DefaultConsumer;

 public class GpgSigner

 {

     public static final String SIGNATURE_EXTENSION = ".asc";

     private boolean useAgent;

     private boolean isInteractive = true;

     private String keyname;

     private String passphrase;

     private File outputDir;

     private File buildDir;

     private File baseDir;

     private File homeDir;

     public void setInteractive( boolean b )

     {

         isInteractive = b;

     }

     public void setUseAgent( boolean b )

     {

         useAgent = b;

     }

     public void setKeyName( String s )

     {

         keyname = s;

     }

     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 File generateSignatureForArtifact( File file )

         throws MojoExecutionException

     {

         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();

         }

         Commandline cmd = new Commandline();

         cmd.setExecutable( "gpg" + ( Os.isFamily( Os.FAMILY_WINDOWS ) ? ".exe" : "" ) );

         if ( homeDir != null )

         {

             cmd.createArg().setValue( "--homedir" );

             cmd.createArg().setFile( homeDir );

         }

         if ( useAgent )

         {

             cmd.createArg().setValue( "--use-agent" );

         }

         else

         {

             cmd.createArg().setValue( "--no-use-agent" );

         }

         InputStream in = null;

         if ( null != passphrase )

         {

             cmd.createArg().setValue( "--passphrase-fd" );

             cmd.createArg().setValue( "0" );

             // Prepare the input stream which will be used to pass the passphrase to the executable

             in = new ByteArrayInputStream( passphrase.getBytes() );

         }

         if ( null != keyname )

         {

             cmd.createArg().setValue( "--local-user" );

             cmd.createArg().setValue( keyname );

         }

         cmd.createArg().setValue( "--armor" );

         cmd.createArg().setValue( "--detach-sign" );

         if ( !isInteractive )

         {

             cmd.createArg().setValue( "--no-tty" );

         }

         cmd.createArg().setValue( "--output" );

         cmd.createArg().setFile( signature );

         cmd.createArg().setFile( file );

         try

         {

             int exitCode = CommandLineUtils.executeCommandLine( cmd, in, new DefaultConsumer(), new DefaultConsumer() );

             if ( exitCode != 0 )

             {

                 throw new MojoExecutionException( "Exit code: " + exitCode );

             }

         }

         catch ( CommandLineException e )

         {

             throw new MojoExecutionException( "Unable to execute gpg command", e );

         }

         return signature;

     }

     private MavenProject findReactorProject( MavenProject prj )

     {

         if ( prj.getParent() != null )

         {

             if ( 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 )

         {

             // TODO: with JDK 1.6, we could call System.console().readPassword("GPG Passphrase: ", null);

             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( "GPG Passphrase:  " );

             MaskingThread thread = new MaskingThread();

             thread.start();

             pass = in.readLine();

             // stop masking

             thread.stopMasking();

         }

         if ( project != null )

         {

             findReactorProject( project ).getProperties().setProperty( "gpg.passphrase", pass );

         }

         return pass;

     }

     // 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;

         }

     }

 }