io.spring.initializr.web.autoconfigure.WebConfig.java Source code

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Here is the source code for io.spring.initializr.web.autoconfigure.WebConfig.java

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/*
 * Copyright 2012-2017 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 io.spring.initializr.web.autoconfigure;

import java.util.Collections;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import io.spring.initializr.util.Agent;
import io.spring.initializr.util.Agent.AgentId;

import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.util.StringUtils;
import org.springframework.web.HttpMediaTypeNotAcceptableException;
import org.springframework.web.accept.ContentNegotiationStrategy;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.util.UrlPathHelper;

/**
 * Spring Initializr web configuration.
 *
 * @author Stephane Nicoll
 */
public class WebConfig extends WebMvcConfigurerAdapter {

    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.defaultContentTypeStrategy(new CommandLineContentNegotiationStrategy());
    }

    /**
     * A command-line aware {@link ContentNegotiationStrategy} that forces the media type
     * to "text/plain" for compatible agents.
     */
    private static class CommandLineContentNegotiationStrategy implements ContentNegotiationStrategy {

        private final UrlPathHelper urlPathHelper = new UrlPathHelper();

        @Override
        public List<MediaType> resolveMediaTypes(NativeWebRequest request)
                throws HttpMediaTypeNotAcceptableException {
            String path = urlPathHelper
                    .getPathWithinApplication(request.getNativeRequest(HttpServletRequest.class));
            if (!StringUtils.hasText(path) || !path.equals("/")) { // Only care about "/"
                return Collections.emptyList();
            }
            String userAgent = request.getHeader(HttpHeaders.USER_AGENT);
            if (userAgent != null) {
                Agent agent = Agent.fromUserAgent(userAgent);
                if (agent != null) {
                    if (AgentId.CURL.equals(agent.getId()) || AgentId.HTTPIE.equals(agent.getId())) {
                        return Collections.singletonList(MediaType.TEXT_PLAIN);
                    }
                }
            }
            return Collections.singletonList(MediaType.APPLICATION_JSON);
        }
    }

}