gcc/libjava/classpath/gnu/javax/crypto/sasl/ClientFactory.java

/* ClientFactory.java -- 
   Copyright (C) 2003, 2006 Free Software Foundation, Inc.

This file is a part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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your option) any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package gnu.javax.crypto.sasl;

import gnu.java.security.Registry;
import gnu.javax.crypto.sasl.anonymous.AnonymousClient;
import gnu.javax.crypto.sasl.crammd5.CramMD5Client;
import gnu.javax.crypto.sasl.plain.PlainClient;
import gnu.javax.crypto.sasl.srp.SRPClient;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslClientFactory;
import javax.security.sasl.SaslException;

/**
 * The implementation of {@link SaslClientFactory}.
 */
public class ClientFactory
    implements SaslClientFactory
{
  // implicit 0-arguments constructor

  public static final Set getNames()
  {
    return Collections.unmodifiableSet(new HashSet(Arrays.asList(getNamesInternal(null))));
  }

  private static final String[] getNamesInternal(Map props)
  {
    String[] all = new String[] {
        Registry.SASL_SRP_MECHANISM,
        Registry.SASL_CRAM_MD5_MECHANISM,
        Registry.SASL_PLAIN_MECHANISM,
        Registry.SASL_ANONYMOUS_MECHANISM };
    if (props == null)
      return all;
    if (hasPolicy(Sasl.POLICY_PASS_CREDENTIALS, props))
      return new String[0];
    List result = new ArrayList(all.length);
    for (int i = 0; i < all.length;)
      result.add(all[i++]);
    if (hasPolicy(Sasl.POLICY_NOPLAINTEXT, props))
      result.remove(Registry.SASL_PLAIN_MECHANISM);
    if (hasPolicy(Sasl.POLICY_NOACTIVE, props))
      {
        result.remove(Registry.SASL_CRAM_MD5_MECHANISM);
        result.remove(Registry.SASL_PLAIN_MECHANISM);
      }
    if (hasPolicy(Sasl.POLICY_NODICTIONARY, props))
      {
        result.remove(Registry.SASL_CRAM_MD5_MECHANISM);
        result.remove(Registry.SASL_PLAIN_MECHANISM);
      }
    if (hasPolicy(Sasl.POLICY_NOANONYMOUS, props))
      {
        result.remove(Registry.SASL_ANONYMOUS_MECHANISM);
      }
    if (hasPolicy(Sasl.POLICY_FORWARD_SECRECY, props))
      {
        result.remove(Registry.SASL_CRAM_MD5_MECHANISM);
        result.remove(Registry.SASL_ANONYMOUS_MECHANISM);
        result.remove(Registry.SASL_PLAIN_MECHANISM);
      }
    return (String[]) result.toArray(new String[0]);
  }

  public static final ClientMechanism getInstance(String mechanism)
  {
    if (mechanism == null)
      return null;
    mechanism = mechanism.trim().toUpperCase();
    if (mechanism.equals(Registry.SASL_SRP_MECHANISM))
      return new SRPClient();
    if (mechanism.equals(Registry.SASL_CRAM_MD5_MECHANISM))
      return new CramMD5Client();
    if (mechanism.equals(Registry.SASL_PLAIN_MECHANISM))
      return new PlainClient();
    if (mechanism.equals(Registry.SASL_ANONYMOUS_MECHANISM))
      return new AnonymousClient();
    return null;
  }

  public SaslClient createSaslClient(String[] mechanisms,
                                     String authorisationID, String protocol,
                                     String serverName, Map props,
                                     CallbackHandler cbh) throws SaslException
  {
    ClientMechanism result = null;
    String mechanism;
    for (int i = 0; i < mechanisms.length; i++)
      {
        mechanism = mechanisms[i];
        result = getInstance(mechanism);
        if (result != null)
          break;
      }
    if (result != null)
      {
        HashMap attributes = new HashMap();
        if (props != null)
          attributes.putAll(props);
        attributes.put(Registry.SASL_AUTHORISATION_ID, authorisationID);
        attributes.put(Registry.SASL_PROTOCOL, protocol);
        attributes.put(Registry.SASL_SERVER_NAME, serverName);
        attributes.put(Registry.SASL_CALLBACK_HANDLER, cbh);
        result.init(attributes);
        return result;
      }
    throw new SaslException("No supported mechanism found in given mechanism list");
  }

  public String[] getMechanismNames(Map props)
  {
    return getNamesInternal(props);
  }

  private static boolean hasPolicy(String propertyName, Map props)
  {
    return "true".equalsIgnoreCase(String.valueOf(props.get(propertyName)));
  }
}