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Netty based path router

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/*
 * Copyright © 2014-2019 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 io.cdap.http;

import io.netty.handler.codec.http.HttpRequest;

/**
 * Re-writes URL of an incoming request before any handlers or their hooks are called.
 * This can be used to map an incoming URL to an URL that a handler understands. The re-writer overwrites the incoming
 * URL with the new value.
 * The re-writer can also send response to the clients, eg. redirect header,
 * and then stop further request processing.
 */
public interface URLRewriter {
  /**
   * Implement this to rewrite URL of an incoming request. The re-written URL needs to be updated back in
   * {@code request} using {@link HttpRequest#setUri(String)}.
   *
   * @param request Incoming HTTP request.
   * @param responder Used to send response to clients.
   * @return true if request processing should continue, false otherwise.
   */
  boolean rewrite(HttpRequest request, HttpResponder responder);
}