/*
    * Copyright 2013-2014 the original author or authors.
    *
    * 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 org.springframework.security.oauth.examples.config;
  
  import javax.servlet.ServletContext;
  import javax.servlet.ServletException;
  
  import org.springframework.web.context.WebApplicationContext;
  import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
  import org.springframework.web.filter.DelegatingFilterProxy;
  import org.springframework.web.servlet.support.AbstractDispatcherServletInitializer;
  
  /**
   * @author Dave Syer
   * 
   */
  public class ServletInitializer extends AbstractDispatcherServletInitializer {
  
  	@Override
  	protected WebApplicationContext createServletApplicationContext() {
  		AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
  		context.register(SecurityConfig.class, WebMvcConfig.class);
  		return context;
  	}
  
  	@Override
  	protected String[] getServletMappings() {
  		return new String[] { "/" };
  	}
  
  	@Override
  	protected WebApplicationContext createRootApplicationContext() {
  		return null;
  	}
  
  	@Override
  	public void onStartup(ServletContext servletContext) throws ServletException {
  		super.onStartup(servletContext);
  		registerProxyFilter(servletContext, "springSecurityFilterChain");
  		registerProxyFilter(servletContext, "oauth2ClientContextFilter");
  	}
  
  	private void registerProxyFilter(ServletContext servletContext, String name) {
  		DelegatingFilterProxy filter = new DelegatingFilterProxy(name);
  		filter.setContextAttribute("org.springframework.web.servlet.FrameworkServlet.CONTEXT.dispatcher");
  		servletContext.addFilter(name, filter).addMappingForUrlPatterns(null, false, "/*");
  	}
  
  }