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/*******************************************************************************
 * Copyright (c) 2017, 2018 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors:
 *     Julien HENRY - Linux implementation
 *     Red Hat Inc. - add validation method to handle KDE failures
 *******************************************************************************/
package org.eclipse.equinox.internal.security.linux;

import java.security.SecureRandom;

import javax.crypto.spec.PBEKeySpec;

import org.eclipse.equinox.internal.security.auth.AuthPlugin;
import org.eclipse.equinox.internal.security.linux.nls.LinuxPasswordProviderMessages;
import org.eclipse.equinox.internal.security.storage.Base64;
import org.eclipse.equinox.internal.security.storage.provider.IValidatingPasswordProvider;
import org.eclipse.equinox.security.storage.provider.IPreferencesContainer;
import org.eclipse.equinox.security.storage.provider.PasswordProvider;

public class LinuxPasswordProvider extends PasswordProvider implements IValidatingPasswordProvider {

  /**
   * The length of the randomly generated password in bytes
   */
  private static final int PASSWORD_LENGTH = 64;

  private native String getMasterPassword() throws SecurityException;

  private native void saveMasterPassword(String password) throws SecurityException;
  
  private native boolean canUnlock() throws SecurityException;

  static {
    System.loadLibrary("keystorelinuxnative"); //$NON-NLS-1$
  }

  @Override
  public PBEKeySpec getPassword(IPreferencesContainer container, int passwordType) {

    boolean newPassword = (passwordType & CREATE_NEW_PASSWORD) != 0;
    boolean passwordChange = (passwordType & PASSWORD_CHANGE) != 0;

    if (!newPassword && !passwordChange) {
      try {
        return new PBEKeySpec(getMasterPassword().toCharArray());
      } catch (SecurityException e) {
        AuthPlugin.getDefault().logError(LinuxPasswordProviderMessages.getMasterPasswordError, e);
        return null;
      }
    }

    byte[] rawPassword = new byte[PASSWORD_LENGTH];
    SecureRandom random = new SecureRandom();
    random.setSeed(System.currentTimeMillis());
    random.nextBytes(rawPassword);
    String newPasswordString = Base64.encode(rawPassword);

    // add info message in the log
    AuthPlugin.getDefault().logMessage(LinuxPasswordProviderMessages.newMasterPasswordGenerated);

    try {
      saveMasterPassword(newPasswordString);
      return new PBEKeySpec(newPasswordString.toCharArray());
    } catch (SecurityException e) {
      AuthPlugin.getDefault().logError(LinuxPasswordProviderMessages.saveMasterPasswordError, e);
      return null;
    }
  }


  @Override
  public boolean isValid() {
    try {
	  return canUnlock();
	} catch (SecurityException e) {
      return false; 
	}
  }

}