/*
    *  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.directory.api.ldap.model.message;
  
  
  import java.util.Arrays;
  
  import org.apache.directory.api.i18n.I18n;
  import org.apache.directory.api.ldap.model.exception.LdapInvalidDnException;
  import org.apache.directory.api.ldap.model.name.Dn;
  import org.apache.directory.api.util.Strings;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * Bind protocol operation request which authenticates and begins a client
   * session. Does not yet contain interfaces for SASL authentication mechanisms.
   * 
   * @author <a href="mailto:dev@directory.apache.org"> Apache Directory Project</a>
   */
  public class BindRequestImpl extends AbstractAbandonableRequest implements BindRequest
  {
  
      /** A logger */
      private static final Logger LOG = LoggerFactory.getLogger( BindRequestImpl.class );
  
      /**
       * Distinguished name identifying the name of the authenticating subject -
       * defaults to the empty string
       */
      private Dn dn;
  
      /**
       * String identifying the name of the authenticating subject -
       * defaults to the empty string
       */
      private String name;
  
      /** The passwords, keys or tickets used to verify user identity */
      private byte[] credentials;
  
      /** A storage for credentials hashCode */
      private int hCredentials;
  
      /** The mechanism used to decode user identity */
      private String mechanism;
  
      /** Simple vs. SASL authentication mode flag */
      private boolean isSimple = true;
  
      /** Bind behavior exhibited by protocol version */
      private boolean isVersion3 = true;
  
      /** The associated response */
      private BindResponse response;
  
  
      // ------------------------------------------------------------------------
      // Constructors
      // ------------------------------------------------------------------------
      /**
       * Creates an BindRequest implementation to bind to an LDAP server.
       */
      public BindRequestImpl()
      {
          super( -1, MessageTypeEnum.BIND_REQUEST );
          hCredentials = 0;
      }
  
  
      // -----------------------------------------------------------------------
      // BindRequest Interface Method Implementations
      // -----------------------------------------------------------------------
  
      /**
       * {@inheritDoc}
       */
      @Override
      public boolean isSimple()
      {
          return isSimple;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean getSimple()
     {
         return isSimple;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest setSimple( boolean simple )
     {
         this.isSimple = simple;
 
         return this;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public byte[] getCredentials()
     {
         return credentials;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest setCredentials( String credentials )
     {
         return setCredentials( Strings.getBytesUtf8( credentials ) );
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest setCredentials( byte[] credentials )
     {
         if ( credentials != null )
         {
             this.credentials = new byte[credentials.length];
             System.arraycopy( credentials, 0, this.credentials, 0, credentials.length );
         }
         else
         {
             this.credentials = null;
         }
 
         // Compute the hashcode
         if ( credentials != null )
         {
             hCredentials = 0;
 
             for ( byte b : credentials )
             {
                 hCredentials = hCredentials * 31 + b;
             }
         }
         else
         {
             hCredentials = 0;
         }
 
         return this;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getSaslMechanism()
     {
         return mechanism;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest setSaslMechanism( String saslMechanism )
     {
         this.isSimple = false;
         this.mechanism = saslMechanism;
 
         return this;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getName()
     {
         return name;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest setName( String name )
     {
         this.name = name;
 
         try
         {
             this.dn = new Dn( name );
         }
         catch ( LdapInvalidDnException e )
         {
             // This might still be a valid DN (Windows AD binding for instance)
             LOG.debug( "Unable to convert the name to a DN." );
             this.dn = null;
         }
 
         return this;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Dn getDn()
     {
         return dn;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest setDn( Dn dn )
     {
         this.dn = dn;
         this.name = dn.getName();
 
         return this;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isVersion3()
     {
         return isVersion3;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean getVersion3()
     {
         return isVersion3;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest setVersion3( boolean version3 )
     {
         this.isVersion3 = version3;
 
         return this;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest setMessageId( int messageId )
     {
         super.setMessageId( messageId );
 
         return this;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest addControl( Control control )
     {
         return ( BindRequest ) super.addControl( control );
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest addAllControls( Control[] controls )
     {
         return ( BindRequest ) super.addAllControls( controls );
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public BindRequest removeControl( Control control )
     {
         return ( BindRequest ) super.removeControl( control );
     }
 
 
     // -----------------------------------------------------------------------
     // BindRequest Interface Method Implementations
     // -----------------------------------------------------------------------
     /**
      * Gets the protocol response message type for this request which produces
      * at least one response.
      * 
      * @return the message type of the response.
      */
     @Override
     public MessageTypeEnum getResponseType()
     {
         return MessageTypeEnum.BIND_RESPONSE;
     }
 
 
     /**
      * The result containing response for this request.
      * 
      * @return the result containing response for this request
      */
     @Override
     public BindResponse getResultResponse()
     {
         if ( response == null )
         {
             response = new BindResponseImpl( getMessageId() );
         }
 
         return response;
     }
 
 
     /**
      * RFC 2251/4511 [Section 4.11]: Abandon, Bind, Unbind, and StartTLS operations
      * cannot be abandoned.
      */
     @Override
     public void abandon()
     {
         throw new UnsupportedOperationException( I18n.err( I18n.ERR_04185 ) );
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean equals( Object obj )
     {
         if ( obj == this )
         {
             return true;
         }
 
         if ( ( obj == null ) || !( obj instanceof BindRequest ) )
         {
             return false;
         }
 
         if ( !super.equals( obj ) )
         {
             return false;
         }
 
         BindRequest req = ( BindRequest ) obj;
 
         if ( req.isSimple() != isSimple() )
         {
             return false;
         }
 
         if ( req.isVersion3() != isVersion3() )
         {
             return false;
         }
 
         String name1 = req.getName();
         String name2 = getName();
 
         if ( Strings.isEmpty( name1 ) )
         {
             if ( !Strings.isEmpty( name2 ) )
             {
                 return false;
             }
         }
         else
         {
             if ( Strings.isEmpty( name2 ) )
             {
                 return false;
             }
             else if ( !name2.equals( name1 ) )
             {
                 return false;
             }
         }
 
         Dn dn1 = req.getDn();
         Dn dn2 = getDn();
 
         if ( Dn.isNullOrEmpty( dn1 ) )
         {
             if ( !Dn.isNullOrEmpty( dn2 ) )
             {
                 return false;
             }
         }
         else
         {
             if ( Dn.isNullOrEmpty( dn2 ) )
             {
                 return false;
             }
             else if ( !dn1.equals( dn2 ) )
             {
                 return false;
             }
         }
 
         return Arrays.equals( req.getCredentials(), getCredentials() );
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public int hashCode()
     {
         int hash = 37;
         hash = hash * 17 + ( credentials == null ? 0 : hCredentials );
         hash = hash * 17 + ( isSimple ? 0 : 1 );
         hash = hash * 17 + ( isVersion3 ? 0 : 1 );
         hash = hash * 17 + ( mechanism == null ? 0 : mechanism.hashCode() );
         hash = hash * 17 + ( name == null ? 0 : name.hashCode() );
         hash = hash * 17 + ( response == null ? 0 : response.hashCode() );
         hash = hash * 17 + super.hashCode();
 
         return hash;
     }
 
 
     /**
      * Get a String representation of a BindRequest
      * 
      * @return A BindRequest String
      */
     @Override
     public String toString()
     {
         StringBuilder sb = new StringBuilder();
 
         sb.append( "    BindRequest\n" );
         sb.append( "        Version : '" ).append( isVersion3 ? "3" : "2" ).append( "'\n" );
 
         if ( ( ( Strings.isEmpty( name ) ) || ( dn == null ) || Strings.isEmpty( dn.getNormName() ) )
             && isSimple )
         {
             sb.append( "        Name : anonymous\n" );
         }
         else
         {
             sb.append( "        Name : '" ).append( name ).append( "'\n" );
 
             if ( isSimple )
             {
                 sb.append( "        Simple authentication : '" ).append( "(omitted-for-safety)" ).append( "'\n" );
             }
             else
             {
                 sb.append( "        Sasl credentials\n" );
                 sb.append( "            Mechanism :'" ).append( mechanism ).append( "'\n" );
 
                 if ( credentials == null )
                 {
                     sb.append( "            Credentials : null" );
                 }
                 else
                 {
                     sb.append( "            Credentials : (omitted-for-safety)" );
                 }
             }
         }
 
         // The controls if any
         return super.toString( sb.toString() );
     }
 }