XSRFTokenCallbackFilter.java

/**
 * Copyright (C) 2009-2012 the original author or authors.
 * See the notice.md file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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 org.fusesource.restygwt.client.callback;

import org.fusesource.restygwt.client.Method;
import org.fusesource.restygwt.client.cache.QueueableCacheStorage;

import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.Response;

public class XSRFTokenCallbackFilter implements CallbackFilter {

    protected XSRFToken xsrf;

    public XSRFTokenCallbackFilter(XSRFToken xsrf) {
        this.xsrf = xsrf;
    }

    @Override
    public RequestCallback filter(final Method method, final Response response,
            RequestCallback callback) {
        String token = response.getHeader(this.xsrf.getHeaderKey());
        String restyCacheHeader = response.getHeader(QueueableCacheStorage.RESTY_CACHE_HEADER);
        if (token != null && (restyCacheHeader == null || restyCacheHeader.isEmpty())){
            this.xsrf.setToken(token);
        }
        return callback;
    }
}