    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005//     http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.internal.services;
    014
    015import org.apache.tapestry5.beanmodel.services.*;
    016import org.apache.tapestry5.http.services.Dispatcher;
    017import org.apache.tapestry5.http.services.Request;
    018import org.apache.tapestry5.http.services.Response;
    019import org.apache.tapestry5.internal.InternalConstants;
    020import org.apache.tapestry5.services.ComponentEventLinkEncoder;
    021import org.apache.tapestry5.services.ComponentRequestHandler;
    022import org.apache.tapestry5.services.PageRenderRequestParameters;
    023
    024import java.io.IOException;
    025
    026/**
    027 * Dispatches incoming requests for render requests. Render requests consist of either just a logical page name (case
    028 * insensitive) or a logical page name plus additional context. Because of this structure, it take a little bit of work
    029 * to identify the split point between the page name and the context.
    030 */
    031public class PageRenderDispatcher implements Dispatcher
    032{
    033    private final ComponentRequestHandler componentRequestHandler;
    034
    035    private final ComponentEventLinkEncoder linkEncoder;
    036
    037    public PageRenderDispatcher(ComponentRequestHandler componentRequestHandler, ComponentEventLinkEncoder linkEncoder)
    038    {
    039        this.componentRequestHandler = componentRequestHandler;
    040        this.linkEncoder = linkEncoder;
    041    }
    042
    043    public boolean dispatch(Request request, final Response response) throws IOException
    044    {
    045        // If a component event request arrives (in production)
    046        // with an invalid component id, then we want it to be a 404
    047        // See TAP5-1481 and TAP5-2388
    048
    049        if (request.getAttribute(InternalConstants.REFERENCED_COMPONENT_NOT_FOUND) != null)
    050        {
    051            // This needs to be cleared out because the container may submit a request back into the filter
    052            // for the 404 page and some containers reuse the existing HttpServletRequest. See TAP5-2388.
    053            request.setAttribute(InternalConstants.REFERENCED_COMPONENT_NOT_FOUND, null);
    054            return false;
    055        }
    056
    057        PageRenderRequestParameters parameters = linkEncoder.decodePageRenderRequest(request);
    058
    059        if (parameters == null) return false;
    060
    061        componentRequestHandler.handlePageRender(parameters);
    062
    063        return true;
    064    }
    065}