/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.logging.log4j.audit.service.security;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.http.HttpStatus;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class LocalAuthorizationInterceptor extends HandlerInterceptorAdapter {
    private static final Logger LOGGER = LogManager.getLogger();
    private final String token;

    public LocalAuthorizationInterceptor(String token) {
        this.token = token;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        LOGGER.traceEntry();
        try {
            if (request.getServletPath().startsWith("/swagger")) {
                return true;
            }

            String authHeader = request.getHeader("Authorization");
            if (authHeader == null || !authHeader.equals(token)) {
                LOGGER.error("Authorization value of " + authHeader + " does not match expected value of " + token);
                response.sendError(HttpStatus.UNAUTHORIZED.value());
                return false;
            }

            return true;
        } finally {
            LOGGER.traceExit();
        }

    }
}
