co.cask.cdap.internal.app.runtime.webapp.WebappURLRewriter.java Source code

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Here is the source code for co.cask.cdap.internal.app.runtime.webapp.WebappURLRewriter.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * 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 co.cask.cdap.internal.app.runtime.webapp;

import co.cask.http.HttpResponder;
import co.cask.http.URLRewriter;
import com.google.common.collect.ImmutableMultimap;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;

/**
 * Rewrites incoming webapp URLs as Gateway URLs, if it is a Gateway call.
 * Otherwise, it resolves the jar path for the requested file.
 */
public class WebappURLRewriter implements URLRewriter {
    private final JarHttpHandler jarHttpHandler;

    public WebappURLRewriter(JarHttpHandler jarHttpHandler) {
        this.jarHttpHandler = jarHttpHandler;
    }

    @Override
    public boolean rewrite(HttpRequest request, HttpResponder responder) {
        String hostHeader = HttpHeaders.getHost(request);
        if (hostHeader == null) {
            return true;
        }

        String originalUri = request.getUri();
        String uri = jarHttpHandler.getServePath(hostHeader, originalUri);
        if (uri != null) {
            // Redirect requests that map to index.html without a trailing slash to url/
            if (!originalUri.endsWith("/") && !originalUri.endsWith("index.html") && uri.endsWith("index.html")) {
                responder.sendStatus(HttpResponseStatus.MOVED_PERMANENTLY,
                        ImmutableMultimap.of("Location", originalUri + "/"));
                return false;
            }
            request.setUri(uri);
        }

        return true;
    }
}