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Jersey core server implementation
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/*
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 *
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.jersey.server.filter;

import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import javax.ws.rs.BadRequestException;
import javax.ws.rs.Priorities;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerRequestFilter;
import javax.ws.rs.core.Response.Status;

import javax.annotation.Priority;

/**
 * Simple server-side request filter that implements CSRF protection as per the
 * Guidelines for Implementation of REST
 * by NSA (section IV.F) and
 * section 4.3 of this paper.
 * If you add it to the request filters of your application, it will check for X-Requested-By header in each
 * request except for those that don't change state (GET, OPTIONS, HEAD). If the header is not found,
 * it returns {@link Status#BAD_REQUEST} response back to the client.
 *
 * @see org.glassfish.jersey.client.filter.CsrfProtectionFilter
 *
 * @author Martin Matula
 */
@Priority(Priorities.AUTHENTICATION) // should be one of the first post-matching filters to get executed
public class CsrfProtectionFilter implements ContainerRequestFilter {

    /**
     * Name of the header this filter will attach to the request.
     */
    public static final String HEADER_NAME = "X-Requested-By";

    private static final Set METHODS_TO_IGNORE;
    static {
        HashSet mti = new HashSet<>();
        mti.add("GET");
        mti.add("OPTIONS");
        mti.add("HEAD");
        METHODS_TO_IGNORE = Collections.unmodifiableSet(mti);
    }

    @Override
    public void filter(ContainerRequestContext rc) throws IOException {
        if (!METHODS_TO_IGNORE.contains(rc.getMethod()) && !rc.getHeaders().containsKey(HEADER_NAME)) {
            throw new BadRequestException();
        }
    }
}