/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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.
*
* Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
*/

package org.pentaho.platform.dataaccess.datasource.wizard.service.impl;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.platform.api.engine.IAuthorizationPolicy;
import org.pentaho.platform.api.engine.IPentahoSession;
import org.pentaho.platform.api.engine.IPluginResourceLoader;
import org.pentaho.platform.engine.core.system.PentahoSystem;
import org.pentaho.platform.engine.security.SecurityHelper;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;

public class SimpleDataAccessPermissionHandler implements IDataAccessPermissionHandler {

  private IAuthorizationPolicy policy = PentahoSystem.get( IAuthorizationPolicy.class );

  private Log logger = LogFactory.getLog( SimpleDataAccessPermissionHandler.class );

  @Override
  public boolean hasDataAccessPermission( IPentahoSession session ) {

    if ( policy.isAllowed( "org.pentaho.platform.dataaccess.datasource.security.manage" ) ) {
      return true;
    }

    Authentication auth = SecurityHelper.getInstance().getAuthentication( session, true );

    IPluginResourceLoader resLoader = PentahoSystem.get( IPluginResourceLoader.class, null );
    String roles = null;
    String users = null;

    // TODO: delete this try catch once data access becomes a fully fledged plugin

    try {
      roles = resLoader.getPluginSetting( getClass(), "settings/data-access-roles" ); //$NON-NLS-1$
      users = resLoader.getPluginSetting( getClass(), "settings/data-access-users" ); //$NON-NLS-1$
    } catch ( Exception e ) {
      logger.debug( "Error getting data access plugin settings", e );
    }

    if ( roles != null && roles.length() > 0 ) {
      String[] roleArr = roles.split( "," ); //$NON-NLS-1$

      for ( String role : roleArr ) {
        for ( GrantedAuthority userRole : auth.getAuthorities() ) {
          if ( role != null && role.trim().equals( userRole.getAuthority() ) ) {
            return true;
          }
        }
      }
    }
    if ( users != null && users.length() > 0 ) {
      String[] userArr = users.split( "," ); //$NON-NLS-1$
      for ( String user : userArr ) {
        if ( user != null && user.trim().equals( auth.getName() ) ) {
          return true;
        }
      }
    }

    return false;
  }

}