springfox.documentation.swagger2.web.HostNameProvider.java Source code

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Here is the source code for springfox.documentation.swagger2.web.HostNameProvider.java

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/*
 *
 *  Copyright 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 springfox.documentation.swagger2.web;

import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
import org.springframework.web.util.UriComponents;

import javax.servlet.http.HttpServletRequest;

import static org.springframework.util.StringUtils.*;

public class HostNameProvider {

    public HostNameProvider() {
        throw new UnsupportedOperationException();
    }

    static UriComponents componentsFrom(HttpServletRequest request) {
        ServletUriComponentsBuilder builder = ServletUriComponentsBuilder.fromServletMapping(request);

        ForwardedHeader forwarded = ForwardedHeader.of(request.getHeader(ForwardedHeader.NAME));
        String proto = hasText(forwarded.getProto()) ? forwarded.getProto()
                : request.getHeader("X-Forwarded-Proto");
        String forwardedSsl = request.getHeader("X-Forwarded-Ssl");

        if (hasText(proto)) {
            builder.scheme(proto);
        } else if (hasText(forwardedSsl) && forwardedSsl.equalsIgnoreCase("on")) {
            builder.scheme("https");
        }

        String host = forwarded.getHost();
        host = hasText(host) ? host : request.getHeader("X-Forwarded-Host");

        if (!hasText(host)) {
            return builder.build();
        }

        String[] hosts = commaDelimitedListToStringArray(host);
        String hostToUse = hosts[0];

        if (hostToUse.contains(":")) {

            String[] hostAndPort = split(hostToUse, ":");

            builder.host(hostAndPort[0]);
            builder.port(Integer.parseInt(hostAndPort[1]));

        } else {
            builder.host(hostToUse);
            builder.port(-1); // reset port if it was forwarded from default port
        }

        String port = request.getHeader("X-Forwarded-Port");

        if (hasText(port)) {
            builder.port(Integer.parseInt(port));
        }

        return builder.build();
    }
}