package org.apache.maven.report.projectinfo;
   
   /*
    * 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.IOException;
  import java.io.InputStream;
  import java.net.Authenticator;
  import java.net.PasswordAuthentication;
  import java.net.URL;
  import java.net.URLConnection;
  import java.security.KeyManagementException;
  import java.security.NoSuchAlgorithmException;
  import java.security.SecureRandom;
  import java.security.cert.X509Certificate;
  import java.util.Properties;
  
  import javax.net.ssl.HostnameVerifier;
  import javax.net.ssl.HttpsURLConnection;
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLSession;
  import javax.net.ssl.SSLSocketFactory;
  import javax.net.ssl.TrustManager;
  import javax.net.ssl.X509TrustManager;
  
  import org.apache.commons.validator.routines.RegexValidator;
  import org.apache.commons.validator.routines.UrlValidator;
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.ArtifactUtils;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.ProjectBuilder;
  import org.apache.maven.project.ProjectBuildingException;
  import org.apache.maven.project.ProjectBuildingRequest;
  // CHECKSTYLE_OFF: UnusedImports
  import org.apache.maven.reporting.AbstractMavenReportRenderer;
  import org.apache.maven.repository.RepositorySystem;
  // CHECKSTYLE_ON: UnusedImports
  import org.apache.maven.settings.Proxy;
  import org.apache.maven.settings.Server;
  import org.apache.maven.settings.Settings;
  import org.codehaus.plexus.util.Base64;
  import org.codehaus.plexus.util.IOUtil;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Utilities methods.
   *
   * @author <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton</a>
   * @version $Id$
   * @since 2.1
   */
  public class ProjectInfoReportUtils
  {
      private static final UrlValidator URL_VALIDATOR = new UrlValidator( new String[] { "http", "https" },
                                                                          new RegexValidator( "^([" + "\\p{Alnum}\\-\\."
                                                                              + "]*)(:\\d*)?(.*)?" ), 0 );
  
      /** The timeout when getting the url input stream */
      private static final int TIMEOUT = 1000 * 5;
  
      /** The default encoding used to transform bytes to characters */
      private static final String DEFAULT_ENCODING = "UTF-8";
  
      /**
       * Get the input stream using UTF-8 as character encoding from a URL.
       *
       * @param url not null
       * @param settings not null to handle proxy settings
       * @return the UTF-8 decoded input stream as string
       * @throws IOException if any
       * @see #getContent(URL, Settings, String)
       */
      public static String getContent( URL url, Settings settings )
          throws IOException
      {
          return getContent( url, settings, DEFAULT_ENCODING );
      }
  
      /**
       * Get the input stream from a URL.
       *
       * @param url not null
       * @param settings not null to handle proxy settings
      * @param encoding the wanted encoding for the URL input stream. If null, UTF-8 will be used.
      * @return the input stream decoded with the wanted encoding as string
      * @throws IOException if any
      */
     public static String getContent( URL url, Settings settings, String encoding )
         throws IOException
     {
         return getContent( url, null, settings, encoding );
     }
 
     /**
      * Get the input stream from a URL.
      *
      * @param url not null
      * @param project could be null
      * @param settings not null to handle proxy settings
      * @param encoding the wanted encoding for the URL input stream. If null, UTF-8 will be used.
      * @return the input stream decoded with the wanted encoding as string
      * @throws IOException if any
      * @since 2.3
      */
     public static String getContent( URL url, MavenProject project, Settings settings, String encoding )
         throws IOException
     {
         String scheme = url.getProtocol();
 
         if ( StringUtils.isEmpty( encoding ) )
         {
             encoding = DEFAULT_ENCODING;
         }
 
         if ( "file".equals( scheme ) )
         {
             InputStream in = null;
             try
             {
                 URLConnection conn = url.openConnection();
                 in = conn.getInputStream();
 
                 final String content = IOUtil.toString( in, encoding );
 
                 in.close();
                 in = null;
 
                 return content;
             }
             finally
             {
                 IOUtil.close( in );
             }
         }
 
         Proxy proxy = settings.getActiveProxy();
         if ( proxy != null )
         {
             if ( "http".equals( scheme ) || "https".equals( scheme ) || "ftp".equals( scheme ) )
             {
                 scheme += ".";
             }
             else
             {
                 scheme = "";
             }
 
             String host = proxy.getHost();
             if ( !StringUtils.isEmpty( host ) )
             {
                 Properties p = System.getProperties();
                 p.setProperty( scheme + "proxySet", "true" );
                 p.setProperty( scheme + "proxyHost", host );
                 p.setProperty( scheme + "proxyPort", String.valueOf( proxy.getPort() ) );
                 if ( !StringUtils.isEmpty( proxy.getNonProxyHosts() ) )
                 {
                     p.setProperty( scheme + "nonProxyHosts", proxy.getNonProxyHosts() );
                 }
 
                 final String userName = proxy.getUsername();
                 if ( !StringUtils.isEmpty( userName ) )
                 {
                     final String pwd = StringUtils.isEmpty( proxy.getPassword() ) ? "" : proxy.getPassword();
                     Authenticator.setDefault( new Authenticator()
                     {
                         /** {@inheritDoc} */
                         @Override
                         protected PasswordAuthentication getPasswordAuthentication()
                         {
                             return new PasswordAuthentication( userName, pwd.toCharArray() );
                         }
                     } );
                 }
             }
         }
 
         InputStream in = null;
         try
         {
             URLConnection conn = getURLConnection( url, project, settings );
             in = conn.getInputStream();
 
             final String string = IOUtil.toString( in, encoding );
 
             in.close();
             in = null;
 
             return string;
         }
         finally
         {
             IOUtil.close( in );
         }
     }
 
     /**
      * @param repositorySystem not null
      * @param artifact not null
      * @param projectBuilder not null
      * @param buildingRequest not null
      * @return the artifact url or null if an error occurred.
      */
     public static String getArtifactUrl( RepositorySystem repositorySystem, Artifact artifact,
                                          ProjectBuilder projectBuilder, ProjectBuildingRequest buildingRequest )
     {
         if ( Artifact.SCOPE_SYSTEM.equals( artifact.getScope() ) )
         {
             return null;
         }
 
         Artifact copyArtifact = ArtifactUtils.copyArtifact( artifact );
         if ( !"pom".equals( copyArtifact.getType() ) )
         {
             copyArtifact =
                 repositorySystem.createProjectArtifact( copyArtifact.getGroupId(), copyArtifact.getArtifactId(),
                                                         copyArtifact.getVersion() );
         }
         try
         {
             MavenProject pluginProject = projectBuilder.build( copyArtifact, buildingRequest ).getProject();
 
             if ( isArtifactUrlValid( pluginProject.getUrl() ) )
             {
                 return pluginProject.getUrl();
             }
 
             return null;
         }
         catch ( ProjectBuildingException e )
         {
             return null;
         }
     }
 
     /**
      * @param artifactId not null
      * @param link could be null
      * @return the artifactId cell with or without a link pattern
      * @see AbstractMavenReportRenderer#linkPatternedText(String)
      */
     public static String getArtifactIdCell( String artifactId, String link )
     {
         if ( StringUtils.isEmpty( link ) )
         {
             return artifactId;
         }
 
         return "{" + artifactId + "," + link + "}";
     }
 
     /**
      * @param url not null
      * @return <code>true</code> if the url is valid, <code>false</code> otherwise.
      */
     public static boolean isArtifactUrlValid( String url )
     {
         if ( StringUtils.isEmpty( url ) )
         {
             return false;
         }
 
         return URL_VALIDATOR.isValid( url );
     }
 
     /**
      * @param url not null
      * @param project not null
      * @param settings not null
      * @return the url connection with auth if required. Don't check the certificate if SSL scheme.
      * @throws IOException if any
      */
     private static URLConnection getURLConnection( URL url, MavenProject project, Settings settings )
         throws IOException
     {
         URLConnection conn = url.openConnection();
         conn.setConnectTimeout( TIMEOUT );
         conn.setReadTimeout( TIMEOUT );
 
         // conn authorization
         //@formatter:off
         if ( settings.getServers() != null
             && !settings.getServers().isEmpty()
             && project != null
             && project.getDistributionManagement() != null
             && (
                     project.getDistributionManagement().getRepository() != null
                  || project.getDistributionManagement().getSnapshotRepository() != null
                )
             && ( StringUtils.isNotEmpty( project.getDistributionManagement().getRepository().getUrl() )
                  || StringUtils.isNotEmpty( project.getDistributionManagement().getSnapshotRepository().getUrl() ) )
                )
         //@formatter:on
         {
             Server server = null;
             if ( url.toString().contains( project.getDistributionManagement().getRepository().getUrl() ) )
             {
                 server = settings.getServer( project.getDistributionManagement().getRepository().getId() );
             }
             if ( server == null
                 && url.toString().contains( project.getDistributionManagement().getSnapshotRepository().getUrl() ) )
             {
                 server = settings.getServer( project.getDistributionManagement().getSnapshotRepository().getId() );
             }
 
             if ( server != null && StringUtils.isNotEmpty( server.getUsername() )
                 && StringUtils.isNotEmpty( server.getPassword() ) )
             {
                 String up = server.getUsername().trim() + ":" + server.getPassword().trim();
                 String upEncoded = new String( Base64.encodeBase64Chunked( up.getBytes() ) ).trim();
 
                 conn.setRequestProperty( "Authorization", "Basic " + upEncoded );
             }
         }
 
         if ( conn instanceof HttpsURLConnection )
         {
             HostnameVerifier hostnameverifier = new HostnameVerifier()
             {
                 /** {@inheritDoc} */
                 public boolean verify( String urlHostName, SSLSession session )
                 {
                     return true;
                 }
             };
             ( (HttpsURLConnection) conn ).setHostnameVerifier( hostnameverifier );
 
             TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager()
             {
                 /** {@inheritDoc} */
                 public void checkClientTrusted( final X509Certificate[] chain, final String authType )
                 {
                 }
 
                 /** {@inheritDoc} */
                 public void checkServerTrusted( final X509Certificate[] chain, final String authType )
                 {
                 }
 
                 /** {@inheritDoc} */
                 public X509Certificate[] getAcceptedIssuers()
                 {
                     return null;
                 }
             } };
 
             try
             {
                 SSLContext sslContext = SSLContext.getInstance( "SSL" );
                 sslContext.init( null, trustAllCerts, new SecureRandom() );
 
                 SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
 
                 ( (HttpsURLConnection) conn ).setSSLSocketFactory( sslSocketFactory );
             }
             catch ( NoSuchAlgorithmException | KeyManagementException e1 )
             {
                 // ignore
             }
         }
 
         return conn;
     }
 }