/*
    * 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.shiro.web.env;
  
  import org.apache.shiro.env.DefaultEnvironment;
  import org.apache.shiro.mgt.SecurityManager;
  import org.apache.shiro.web.config.ShiroFilterConfiguration;
  import org.apache.shiro.web.filter.mgt.FilterChainResolver;
  import org.apache.shiro.web.mgt.WebSecurityManager;
  
  import javax.servlet.ServletContext;
  import java.util.Map;
  
  /**
   * Default {@link WebEnvironment} implementation based on a backing {@link Map} instance.
   *
   * @since 1.2
   */
  public class DefaultWebEnvironment extends DefaultEnvironment implements MutableWebEnvironment {
  
      private static final String DEFAULT_FILTER_CHAIN_RESOLVER_NAME = "filterChainResolver";
      private static final String SHIRO_FILTER_CONFIG_NAME = "shiroFilter";
  
      private ServletContext servletContext;
  
      private ShiroFilterConfiguration filterConfiguration;
  
      public DefaultWebEnvironment() {
          super();
      }
  
      public FilterChainResolver getFilterChainResolver() {
          return getObject(DEFAULT_FILTER_CHAIN_RESOLVER_NAME, FilterChainResolver.class);
      }
  
      public void setFilterChainResolver(FilterChainResolver filterChainResolver) {
          setObject(DEFAULT_FILTER_CHAIN_RESOLVER_NAME, filterChainResolver);
      }
  
      @Override
      public SecurityManager getSecurityManager() throws IllegalStateException {
          return getWebSecurityManager();
      }
  
      @Override
      public void setSecurityManager(SecurityManager securityManager) {
          assertWebSecurityManager(securityManager);
          super.setSecurityManager(securityManager);
      }
  
      public WebSecurityManager getWebSecurityManager() {
          SecurityManager sm = super.getSecurityManager();
          assertWebSecurityManager(sm);
          return (WebSecurityManager) sm;
      }
  
      public void setWebSecurityManager(WebSecurityManager wsm) {
          super.setSecurityManager(wsm);
      }
  
      private void assertWebSecurityManager(SecurityManager sm) {
          if (!(sm instanceof WebSecurityManager)) {
              String msg = "SecurityManager instance must be a " + WebSecurityManager.class.getName() + " instance.";
              throw new IllegalStateException(msg);
          }
      }
  
      public ServletContext getServletContext() {
          return this.servletContext;
      }
  
      public void setServletContext(ServletContext servletContext) {
          this.servletContext = servletContext;
      }
  
  
      @Override
      public void setShiroFilterConfiguration(ShiroFilterConfiguration filterConfiguration) {
          setObject(SHIRO_FILTER_CONFIG_NAME, filterConfiguration);
      }
  
      @Override
      public ShiroFilterConfiguration getShiroFilterConfiguration() {
         ShiroFilterConfiguration config = getObject(SHIRO_FILTER_CONFIG_NAME, ShiroFilterConfiguration.class);
         // Use the default configuration if config is null
         if (config == null) {
             config = MutableWebEnvironment.super.getShiroFilterConfiguration();
             setShiroFilterConfiguration(config);
         }
         return config;
     }
 }