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Delegates authentication to LDAP

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/*
 * SonarQube LDAP Plugin
 * Copyright (C) 2009-2017 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.plugins.ldap;

import java.io.IOException;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;

/**
 * @author Evgeny Mandrikov
 */
public class CallbackHandlerImpl implements CallbackHandler {
  private String name;
  private String password;

  public CallbackHandlerImpl(String name, String password) {
    this.name = name;
    this.password = password;
  }

  @Override
  public void handle(Callback[] callbacks) throws UnsupportedCallbackException, IOException {
    for (Callback callBack : callbacks) {
      if (callBack instanceof NameCallback) {
        // Handles username callback
        NameCallback nameCallback = (NameCallback) callBack;
        nameCallback.setName(name);
      } else if (callBack instanceof PasswordCallback) {
        // Handles password callback
        PasswordCallback passwordCallback = (PasswordCallback) callBack;
        passwordCallback.setPassword(password.toCharArray());
      } else {
        throw new UnsupportedCallbackException(callBack, "Callback not supported");
      }
    }
  }
}