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package org.glassfish.jersey.client.filter;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import javax.ws.rs.client.ClientRequestContext;
import javax.ws.rs.client.ClientRequestFilter;
/**
* Simple client-side filter that adds X-Requested-By headers to all state-changing
* request (i.e. request for methods other than GET, HEAD and OPTIONS).
* This is to satisfy the requirements of the {@code org.glassfish.jersey.server.filter.CsrfProtectionFilter}
* on the server side.
*
* @author Martin Matula
*/
public class CsrfProtectionFilter implements ClientRequestFilter {
/**
* Name of the header this filter will attach to the request.
*/
public static final String HEADER_NAME = "X-Requested-By";
private static final Set<String> METHODS_TO_IGNORE;
static {
HashSet<String> mti = new HashSet<String>();
mti.add("GET");
mti.add("OPTIONS");
mti.add("HEAD");
METHODS_TO_IGNORE = Collections.unmodifiableSet(mti);
}
private final String requestedBy;
/**
* Creates a new instance of the filter with X-Requested-By header value set to empty string.
*/
public CsrfProtectionFilter() {
this("");
}
/**
* Initialized the filter with a desired value of the X-Requested-By header.
*
* @param requestedBy Desired value of X-Requested-By header the filter
* will be adding for all potentially state changing requests.
*/
public CsrfProtectionFilter(final String requestedBy) {
this.requestedBy = requestedBy;
}
@Override
public void filter(ClientRequestContext rc) throws IOException {
if (!METHODS_TO_IGNORE.contains(rc.getMethod()) && !rc.getHeaders().containsKey(HEADER_NAME)) {
rc.getHeaders().add(HEADER_NAME, requestedBy);
}
}
}