/*
 * eGov suite of products aim to improve the internal efficiency,transparency,
 *    accountability and the service delivery of the government  organizations.
 *
 *     Copyright (C) <2015>  eGovernments Foundation
 *
 *     The updated version of eGov suite of products as by eGovernments Foundation
 *     is available at http://www.egovernments.org
 *
 *     This program 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 3 of the License, or
 *     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 General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program. If not, see http://www.gnu.org/licenses/ or
 *     http://www.gnu.org/licenses/gpl.html .
 *
 *     In addition to the terms of the GPL license to be adhered to in using this
 *     program, the following additional terms are to be complied with:
 *
 *         1) All versions of this program, verbatim or modified must carry this
 *            Legal Notice.
 *
 *         2) Any misrepresentation of the origin of the material is prohibited. It
 *            is required that all modified versions of this material be marked in
 *            reasonable ways as different from the original version.
 *
 *         3) This license does not grant any rights to any user of the program
 *            with regards to rights under trademark law for use of the trade names
 *            or trademarks of eGovernments Foundation.
 *
 *   In case of any queries, you can reach eGovernments Foundation at contact@egovernments.org.
 */

package org.egov.infstr.security.spring.filter;

import org.apache.commons.lang3.StringUtils;
import org.egov.infra.config.security.authentication.SecureUser;
import org.egov.infra.security.utils.SecurityConstants;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class EgovAuthenticationProcessingFilter extends UsernamePasswordAuthenticationFilter {

    private List<String> credentialFields = new ArrayList<String>();

    public void setCredentialFields(final List<String> credentialFields) {
        this.credentialFields = credentialFields;
    }

    @Override
    protected void setDetails(final HttpServletRequest request, final UsernamePasswordAuthenticationToken authToken) {
        authToken.setDetails(authenticationDetailsSource.buildDetails(request));
    }

    @Override
    protected void successfulAuthentication(final HttpServletRequest request, final HttpServletResponse response,
            final FilterChain filterChain, final Authentication authResult) throws IOException, ServletException {
        // Add information to session variables
        final String location = request.getParameter(SecurityConstants.LOCATION_FIELD);
        final HttpSession session = request.getSession();
        if (StringUtils.isNotBlank(location))
            session.setAttribute(SecurityConstants.LOCATION_FIELD, location);

        if (authResult != null) {
            final SecureUser principal = (SecureUser) authResult.getPrincipal();
            session.setAttribute("userid", principal.getUserId());
            session.setAttribute("username", principal.getUsername());
        }
        super.successfulAuthentication(request, response, filterChain, authResult);
    }

    @Override
    public Authentication attemptAuthentication(final HttpServletRequest request, final HttpServletResponse response) {
        final HashMap<String, String> credentials = new HashMap<String, String>();
        for (final String credential : credentialFields) {
            final String field = request.getParameter(credential) == null ? "" : request.getParameter(credential);
            credentials.put(credential, field);
        }
        final String username = request.getParameter(SecurityConstants.USERNAME_FIELD);
        final UsernamePasswordAuthenticationToken authToken = new UsernamePasswordAuthenticationToken(username, credentials);
        request.getSession().setAttribute(SecurityConstants.USERNAME_FIELD, username);
        setDetails(request, authToken);

        return getAuthenticationManager().authenticate(authToken);
    }

}