/*-
 * ============LICENSE_START=======================================================
 * ECOMP-PDP-REST
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.policy.pdp.rest.restAuth;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.openecomp.policy.pdp.rest.restAuth.AuthenticationService;

/**
 * Servlet Filter implementation class PDPAuthenticationFilter
 */
@WebFilter("/*")
public class PDPAuthenticationFilter implements Filter {

	public static final String AUTHENTICATION_HEADER = "Authorization";

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain filter) throws IOException, ServletException {
		if (request instanceof HttpServletRequest) {
			HttpServletRequest httpServletRequest = (HttpServletRequest) request;
			String authCredentials = httpServletRequest.getHeader(AUTHENTICATION_HEADER);
			String path = ((HttpServletRequest) request).getRequestURI();
			// better injected
			AuthenticationService authenticationService = new AuthenticationService();

			boolean authenticationStatus = authenticationService.authenticate(authCredentials);

			if (authenticationStatus) {
				filter.doFilter(request, response);
			} else if(path.contains("notifications")){
				filter.doFilter(request, response);
			} else {
				if (response instanceof HttpServletResponse) {
					HttpServletResponse httpServletResponse = (HttpServletResponse) response;
					httpServletResponse.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
				}
			}
		}
	}

	@Override
	public void destroy() {
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
	}

}