/*
    * 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.
   */
  package org.apache.maven.plugins.gpg;
  
  import java.io.File;
  import java.io.IOException;
  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 {
      private static final String GPG_PASSPHRASE = "gpg.passphrase";
  
      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 MojoExecutionException if signature generation fails
      */
     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 (isPossibleRootOfArtifact(signatureDirectory)) {
                     break;
                 }
                 fileDirectory = signatureDirectory.getName() + File.separatorChar + fileDirectory;
             }
             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 if signature generation fails
      */
     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 = new String(readPassword("GPG Passphrase: "));
         }
         if (project != null) {
             findReactorProject(project).getProperties().setProperty(GPG_PASSPHRASE, pass);
         }
         return pass;
     }
 
     private char[] readPassword(String prompt) throws IOException {
         return System.console().readPassword();
     }
 
     private boolean isPossibleRootOfArtifact(File signatureDirectory) {
         return signatureDirectory.equals(outputDir)
                 || signatureDirectory.equals(buildDir)
                 || signatureDirectory.equals(baseDir);
     }
 }