org.graylog2.rest.filter.WebAppNotFoundResponseFilter Maven / Gradle / Ivy

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There is a newer version: 6.0.1
/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.rest.filter;

import org.graylog2.configuration.HttpConfiguration;
import org.graylog2.web.IndexHtmlGenerator;

import javax.annotation.Priority;
import javax.inject.Inject;
import javax.ws.rs.Priorities;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.util.List;

@Priority(Priorities.ENTITY_CODER)
public class WebAppNotFoundResponseFilter implements ContainerResponseFilter {
    private final IndexHtmlGenerator indexHtmlGenerator;

    @Inject
    public WebAppNotFoundResponseFilter(IndexHtmlGenerator indexHtmlGenerator) {
        this.indexHtmlGenerator = indexHtmlGenerator;
    }

    @Override
    public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
        final Response.StatusType responseStatus = responseContext.getStatusInfo();
        final String requestPath = requestContext.getUriInfo().getAbsolutePath().getPath();
        final List acceptableMediaTypes = requestContext.getAcceptableMediaTypes();
        final boolean acceptsHtml = acceptableMediaTypes.stream()
                .anyMatch(mediaType -> mediaType.isCompatible(MediaType.TEXT_HTML_TYPE) || mediaType.isCompatible(MediaType.APPLICATION_XHTML_XML_TYPE));
        final boolean isGetRequest = "get".equalsIgnoreCase(requestContext.getMethod());

        if (isGetRequest
                && responseStatus == Response.Status.NOT_FOUND
                && acceptsHtml
                && !requestPath.startsWith("/" + HttpConfiguration.PATH_API)) {
            final String entity = indexHtmlGenerator.get(requestContext.getHeaders());
            responseContext.setStatusInfo(Response.Status.OK);
            responseContext.setEntity(entity, new Annotation[0], MediaType.TEXT_HTML_TYPE);

            responseContext.getHeaders().putSingle("X-UA-Compatible", "IE=edge");
        }
    }
}