org.graylog2.web.resources.AppConfigResource Maven / Gradle / Ivy

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Graylog
There is a newer version: 6.0.6
/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see .
 */
package org.graylog2.web.resources;

import com.floreysoft.jmte.Engine;
import com.google.common.base.Strings;
import com.google.common.io.Resources;
import org.graylog2.Configuration;

import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;

@Path("/config.js")
public class AppConfigResource {
    private static final String CK_OVERRIDE_SERVER_URI = "X-Graylog-Server-URL";
    private static final Engine engine = new Engine();
    private final Configuration configuration;

    @Inject
    public AppConfigResource(Configuration configuration) {
        this.configuration = configuration;
    }

    @GET
    @Produces(MediaType.APPLICATION_OCTET_STREAM)
    public String get(@Context HttpHeaders headers) {
        final URL templateUrl = this.getClass().getResource("/web-interface/config.js.template");
        final String template;
        try {
            template = Resources.toString(templateUrl, StandardCharsets.UTF_8);
        } catch (IOException e) {
            throw new RuntimeException("Unable to read AppConfig template while generating web interface configuration: ", e);
        }

        final String serverTransportUri = serverUriFromHeadersOrDefault(headers);
        final Map model = new HashMap() {{
            put("rootTimeZone", configuration.getRootTimeZone());
            put("serverUri", serverTransportUri);
            put("appPathPrefix", "");
        }};
        return engine.transform(template, model);
    }

    private String serverUriFromHeadersOrDefault(HttpHeaders httpHeaders) {
        final List overrideServerUriHeaders = httpHeaders.getRequestHeader(CK_OVERRIDE_SERVER_URI);
        if (overrideServerUriHeaders != null && !overrideServerUriHeaders.isEmpty()) {
            Optional firstHeader = overrideServerUriHeaders.stream().filter(s -> {
                try {
                    return !Strings.isNullOrEmpty(s) && new URL(s) != null;
                } catch (MalformedURLException e) {
                    return false;
                }
            }).findFirst();

            return firstHeader.orElse(configuration.getRestTransportUri().toString());
        }

        return configuration.getRestTransportUri().toString();
    }
}