org.grails.web.servlet.mvc.TokenResponseActionResultTransformer.groovy Maven / Gradle / Ivy

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/*
 * Copyright 2014 the original author or authors.
 *
 * 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.grails.web.servlet.mvc

import groovy.transform.CompileStatic
import grails.web.mvc.FlashScope
import org.grails.web.servlet.mvc.exceptions.ControllerExecutionException
import org.grails.web.util.WebUtils

/**
 * An {@link ActionResultTransformer} that adds support for the "Synchronizer Token Pattern"
 *
 * @author Graeme Rocher
 * @since 3.0
 */
@CompileStatic
class TokenResponseActionResultTransformer implements ActionResultTransformer{

    @Override
    def transformActionResult(GrailsWebRequest webRequest, String viewName, Object actionResult) {
        def request = webRequest.request
        def response = webRequest.response
        TokenResponseHandler handler = (TokenResponseHandler) request.getAttribute(TokenResponseHandler.KEY);
        if (handler != null && !handler.wasInvoked() && handler.wasInvalidToken()) {
            String uri = (String) request.getAttribute(SynchronizerTokensHolder.TOKEN_URI);
            if (uri == null) {
                uri = WebUtils.getForwardURI(request);
            }
            try {
                FlashScope flashScope = webRequest.getFlashScope();
                flashScope.put(TokenResponseHandler.INVALID_TOKEN_ATTRIBUTE, request.getParameter(SynchronizerTokensHolder.TOKEN_KEY));
                response.sendRedirect(uri);
                return null;
            }
            catch (IOException e) {
                throw new ControllerExecutionException("I/O error sending redirect to URI: " + uri,e);
            }
        }
        return actionResult
    }
}