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/* SRPAuthInfoProvider.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

the Free Software Foundation; either version 2 of the License, or (at

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.

You should have received a copy of the GNU General Public License

along with GNU Classpath; if not, write to the Free Software

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

conditions of the GNU General Public License cover the whole

combination.

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

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version.  */

package gnu.javax.crypto.sasl.srp;

import gnu.java.security.Registry;

import gnu.java.security.util.Util;

import gnu.javax.crypto.sasl.IAuthInfoProvider;

import gnu.javax.crypto.sasl.NoSuchUserException;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.security.sasl.AuthenticationException;

/**

 * The SRP mechanism authentication information provider implementation.

 */

public class SRPAuthInfoProvider

    implements IAuthInfoProvider

{

  private PasswordFile passwordFile = null;

  // implicit 0-args constrcutor

  public void activate(Map context) throws AuthenticationException

  {

    try

      {

        if (context == null)

          passwordFile = new PasswordFile();

        else

          {

            passwordFile = (PasswordFile) context.get(SRPRegistry.PASSWORD_DB);

            if (passwordFile == null)

              {

                String pfn = (String) context.get(SRPRegistry.PASSWORD_FILE);

                if (pfn == null)

                  passwordFile = new PasswordFile();

                else

                  passwordFile = new PasswordFile(pfn);

              }

          }

      }

    catch (IOException x)

      {

        throw new AuthenticationException("activate()", x);

      }

  }

  public void passivate() throws AuthenticationException

  {

    passwordFile = null;

  }

  public boolean contains(String userName) throws AuthenticationException

  {

    if (passwordFile == null)

      throw new AuthenticationException("contains()",

                                        new IllegalStateException());

    boolean result = false;

    try

      {

        result = passwordFile.contains(userName);

      }

    catch (IOException x)

      {

        throw new AuthenticationException("contains()", x);

      }

    return result;

  }

  public Map lookup(Map userID) throws AuthenticationException

  {

    if (passwordFile == null)

      throw new AuthenticationException("lookup()", new IllegalStateException());

    Map result = new HashMap();

    try

      {

        String userName = (String) userID.get(Registry.SASL_USERNAME);

        if (userName == null)

          throw new NoSuchUserException("");

        String mdName = (String) userID.get(SRPRegistry.MD_NAME_FIELD);

        String[] data = passwordFile.lookup(userName, mdName);

        result.put(SRPRegistry.USER_VERIFIER_FIELD, data[0]);

        result.put(SRPRegistry.SALT_FIELD, data[1]);

        result.put(SRPRegistry.CONFIG_NDX_FIELD, data[2]);

      }

    catch (Exception x)

      {

        if (x instanceof AuthenticationException)

          throw (AuthenticationException) x;

        throw new AuthenticationException("lookup()", x);

      }

    return result;

  }

  public void update(Map userCredentials) throws AuthenticationException

  {

    if (passwordFile == null)

      throw new AuthenticationException("update()", new IllegalStateException());

    try

      {

        String userName = (String) userCredentials.get(Registry.SASL_USERNAME);

        String password = (String) userCredentials.get(Registry.SASL_PASSWORD);

        String salt = (String) userCredentials.get(SRPRegistry.SALT_FIELD);

        String config = (String) userCredentials.get(SRPRegistry.CONFIG_NDX_FIELD);

        if (salt == null || config == null)

          passwordFile.changePasswd(userName, password);

        else

          passwordFile.add(userName, password, Util.fromBase64(salt), config);

      }

    catch (Exception x)

      {

        if (x instanceof AuthenticationException)

          throw (AuthenticationException) x;

        throw new AuthenticationException("update()", x);

      }

  }

  public Map getConfiguration(String mode) throws AuthenticationException

  {

    if (passwordFile == null)

      throw new AuthenticationException("getConfiguration()",

                                        new IllegalStateException());

    Map result = new HashMap();

    try

      {

        String[] data = passwordFile.lookupConfig(mode);

        result.put(SRPRegistry.SHARED_MODULUS, data[0]);

        result.put(SRPRegistry.FIELD_GENERATOR, data[1]);

      }

    catch (Exception x)

      {

        if (x instanceof AuthenticationException)

          throw (AuthenticationException) x;

        throw new AuthenticationException("getConfiguration()", x);

      }

    return result;

  }

}