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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.google.common.collect.ImmutableList;
import org.apache.druid.java.util.common.StringUtils;
import org.apache.druid.server.security.AuthenticationUtils;
import org.eclipse.jetty.rewrite.handler.RedirectPatternRule;
import org.eclipse.jetty.rewrite.handler.RewriteHandler;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.util.resource.Resource;

import java.util.List;

class WebConsoleJettyServerInitializer
{
  private static final String WEB_CONSOLE_ROOT_DOCUMENT = "unified-console.html";
  private static final String WEB_CONSOLE_ROOT = StringUtils.format("/%s", WEB_CONSOLE_ROOT_DOCUMENT);
  private static final List UNSECURED_PATHS_FOR_UI = ImmutableList.of(
      "/",
      "/favicon.png",
      "/assets/*",
      "/public/*",
      "/console-config.js"
  );

  private static final List UNAUTHORIZED_PATHS_FOR_UI = ImmutableList.of(
      WEB_CONSOLE_ROOT
  );

  static void intializeServerForWebConsoleRoot(ServletContextHandler root)
  {
    root.setInitParameter("org.eclipse.jetty.servlet.Default.redirectWelcome", "true");
    root.setWelcomeFiles(new String[]{WEB_CONSOLE_ROOT_DOCUMENT});

    root.setBaseResource(Resource.newClassPathResource("org/apache/druid/console"));

    AuthenticationUtils.addNoopAuthenticationAndAuthorizationFilters(root, UNSECURED_PATHS_FOR_UI);
    AuthenticationUtils.addNoopAuthorizationFilters(root, UNAUTHORIZED_PATHS_FOR_UI);
  }

  static RewriteHandler createWebConsoleRewriteHandler()
  {
    // redirect all legacy web consoles to current unified web console
    RewriteHandler rewrite = new RewriteHandler();

    addRedirectToWebConsoleRoot(rewrite, "/index.html");
    addRedirectToWebConsoleRoot(rewrite, "/console.html");
    addRedirectToWebConsoleRoot(rewrite, "/old-console.html");

    return rewrite;
  }

  private static void addRedirectToWebConsoleRoot(RewriteHandler rewrite, String oldPath)
  {
    RedirectPatternRule redirect = new RedirectPatternRule();
    redirect.setPattern(oldPath);
    redirect.setLocation(WEB_CONSOLE_ROOT);
    rewrite.addRule(redirect);
  }
}