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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.druid.cli;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.servlet.GuiceFilter;
import org.apache.druid.guice.annotations.Json;
import org.apache.druid.java.util.common.logger.Logger;
import org.apache.druid.server.initialization.ServerConfig;
import org.apache.druid.server.initialization.jetty.JettyServerInitUtils;
import org.apache.druid.server.initialization.jetty.JettyServerInitializer;
import org.apache.druid.server.security.AuthConfig;
import org.apache.druid.server.security.AuthenticationUtils;
import org.apache.druid.server.security.Authenticator;
import org.apache.druid.server.security.AuthenticatorMapper;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.DefaultHandler;
import org.eclipse.jetty.server.handler.HandlerList;
import org.eclipse.jetty.servlet.DefaultServlet;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;

import java.util.Collections;
import java.util.List;

/**
*/
class MiddleManagerJettyServerInitializer implements JettyServerInitializer
{
  private static Logger log = new Logger(MiddleManagerJettyServerInitializer.class);

  private final ServerConfig serverConfig;
  private final AuthConfig authConfig;

  @Inject
  public MiddleManagerJettyServerInitializer(ServerConfig serverConfig, AuthConfig authConfig)
  {
    this.serverConfig = serverConfig;
    this.authConfig = authConfig;
  }

  private static List UNSECURED_PATHS = Collections.singletonList("/status/health");

  @Override
  public void initialize(Server server, Injector injector)
  {
    final ServletContextHandler root = new ServletContextHandler(ServletContextHandler.SESSIONS);
    root.addServlet(new ServletHolder(new DefaultServlet()), "/*");

    final AuthConfig authConfig = injector.getInstance(AuthConfig.class);
    final ObjectMapper jsonMapper = injector.getInstance(Key.get(ObjectMapper.class, Json.class));
    final AuthenticatorMapper authenticatorMapper = injector.getInstance(AuthenticatorMapper.class);

    JettyServerInitUtils.addQosFilters(root, injector);
    AuthenticationUtils.addSecuritySanityCheckFilter(root, jsonMapper);

    // perform no-op authorization/authentication for these resources
    AuthenticationUtils.addNoopAuthenticationAndAuthorizationFilters(root, UNSECURED_PATHS);
    AuthenticationUtils.addNoopAuthenticationAndAuthorizationFilters(root, authConfig.getUnsecuredPaths());

    final List authenticators = authenticatorMapper.getAuthenticatorChain();
    AuthenticationUtils.addAuthenticationFilterChain(root, authenticators);

    AuthenticationUtils.addAllowOptionsFilter(root, authConfig.isAllowUnauthenticatedHttpOptions());
    JettyServerInitUtils.addAllowHttpMethodsFilter(root, serverConfig.getAllowedHttpMethods());

    JettyServerInitUtils.addExtensionFilters(root, injector);

    // Check that requests were authorized before sending responses
    AuthenticationUtils.addPreResponseAuthorizationCheckFilter(
        root,
        authenticators,
        jsonMapper
    );

    root.addFilter(GuiceFilter.class, "/*", null);

    final HandlerList handlerList = new HandlerList();
    JettyServerInitUtils.maybeAddHSTSRewriteHandler(serverConfig, handlerList);

    handlerList.addHandler(JettyServerInitUtils.getJettyRequestLogHandler());

    handlerList.addHandler(JettyServerInitUtils.wrapWithDefaultGzipHandler(
        root,
        serverConfig.getInflateBufferSize(),
        serverConfig.getCompressionLevel()
    ));

    handlerList.addHandler(new DefaultHandler());

    server.setHandler(handlerList);
  }
}