spring.travel.site.request.RequestInfoInterceptor.java Source code

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Here is the source code for spring.travel.site.request.RequestInfoInterceptor.java

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/**
 * Copyright 2014 Andy Godwin
 *
 * 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.
 */
package spring.travel.site.request;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.Optional;

@Component
public class RequestInfoInterceptor extends HandlerInterceptorAdapter {

    @Value("${session.cookieName:GETAWAY_SESSION}")
    private String cookieName;

    @Value("${request.attributeName:REQUEST-INFO}")
    private String requestAttributeName;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        request.setAttribute(requestAttributeName,
                new Request(Optional.empty(), getSessionCookie(request), request.getRemoteAddr()));
        return true;
    }

    private Optional<String> getSessionCookie(HttpServletRequest request) {
        Enumeration<String> cookies = request.getHeaders("Cookie");
        if (cookies != null) {
            while (cookies.hasMoreElements()) {
                String cookie = cookies.nextElement();
                if (cookie.startsWith(cookieName) && cookie.indexOf('=') > 0) {
                    return getCookieValue(cookie);
                }
            }
        }
        return Optional.empty();
    }

    private Optional<String> getCookieValue(String cookie) {
        String value = cookie.substring(cookie.indexOf('=') + 1);
        if (value.startsWith("\"")) {
            value = value.substring(1);
        }
        if (value.endsWith("\"")) {
            value = value.substring(0, value.length() - 1);
        }
        return Optional.of(value);
    }
}