com.clusterra.freemarker.renderer.resolvehost.HttpServletRequestHostResolver Maven / Gradle / Ivy

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A application used as an example on how to set up pushing its components to the Central Repository.

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/*
 * Copyright (c) 2015 the original author or authors
 *
 * 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 com.clusterra.freemarker.renderer.resolvehost;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * Created by Denis Kuchugurov
 * on 21/10/14 21:20.
 */
@Component
public class HttpServletRequestHostResolver implements HostResolver {


    private final static Logger logger = LoggerFactory.getLogger(HttpServletRequestHostResolver.class);

    @Override
    public String resolveHost() {

        HttpServletRequest request = getCurrentRequest();

        String scheme = request.getScheme();
        String serverName = request.getServerName();
        int serverPort = request.getServerPort();
        return StringUtils.join(scheme, "://", serverName, ":", serverPort);
    }

    private HttpServletRequest getCurrentRequest() {

        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        Validate.notNull(requestAttributes, "current request is null, via RequestContextHolder");

        Assert.isInstanceOf(ServletRequestAttributes.class, requestAttributes);

        HttpServletRequest servletRequest = ((ServletRequestAttributes) requestAttributes).getRequest();

        Validate.notNull(servletRequest, "HttpServletRequest is null");
        return servletRequest;
    }
}