/*
    * Copyright 2006-2011 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
    *
    * https://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.oauth2.config.xml;
  
  import org.springframework.aop.scope.ScopedProxyUtils;
  import org.springframework.beans.factory.config.BeanDefinition;
  import org.springframework.beans.factory.config.BeanDefinitionHolder;
  import org.springframework.beans.factory.support.BeanDefinitionBuilder;
  import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
  import org.springframework.beans.factory.xml.ParserContext;
  import org.springframework.security.oauth2.client.DefaultOAuth2ClientContext;
  import org.springframework.security.oauth2.client.OAuth2RestTemplate;
  import org.springframework.security.oauth2.client.token.DefaultAccessTokenRequest;
  import org.springframework.util.StringUtils;
  import org.w3c.dom.Element;
  
  /**
   * @author Dave Syer
   * 
   */
  public class RestTemplateBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {
  
  	@Override
  	protected Class<?> getBeanClass(Element element) {
  		return OAuth2RestTemplate.class;
  	}
  
  	@Override
  	protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
  
  		String accessTokenProviderRef = element.getAttribute("access-token-provider");
  		
  		builder.addConstructorArgReference(element.getAttribute("resource"));
  
  		BeanDefinitionBuilder request = BeanDefinitionBuilder.genericBeanDefinition(DefaultAccessTokenRequest.class);
  		request.setScope("request");
  		request.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
  		request.addConstructorArgValue("#{request.parameterMap}");
  		request.addPropertyValue("currentUri", "#{request.getAttribute('currentUri')}");
  
  		BeanDefinitionHolder requestDefinition = new BeanDefinitionHolder(request.getRawBeanDefinition(), parserContext
  				.getReaderContext().generateBeanName(request.getRawBeanDefinition()));
  		parserContext.getRegistry().registerBeanDefinition(requestDefinition.getBeanName(),
  				requestDefinition.getBeanDefinition());
  		BeanDefinitionHolder requestHolder = ScopedProxyUtils.createScopedProxy(requestDefinition,
  				parserContext.getRegistry(), false);
  
  		BeanDefinitionBuilder scopedContext = BeanDefinitionBuilder
  				.genericBeanDefinition(DefaultOAuth2ClientContext.class);
  		scopedContext.setScope("session");
  		scopedContext.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
  		BeanDefinitionHolder contextDefinition = new BeanDefinitionHolder(scopedContext.getRawBeanDefinition(),
  				parserContext.getReaderContext().generateBeanName(scopedContext.getRawBeanDefinition()));
  		parserContext.getRegistry().registerBeanDefinition(contextDefinition.getBeanName(),
  				contextDefinition.getBeanDefinition());
  		BeanDefinitionHolder contextHolder = ScopedProxyUtils.createScopedProxy(contextDefinition,
  				parserContext.getRegistry(), false);
  		scopedContext.addConstructorArgValue(requestHolder.getBeanDefinition());
  
  		BeanDefinitionBuilder bareContext = BeanDefinitionBuilder
  				.genericBeanDefinition(DefaultOAuth2ClientContext.class);
  
  		BeanDefinitionBuilder context = BeanDefinitionBuilder
  				.genericBeanDefinition(OAuth2ClientContextFactoryBean.class);
  
  		context.addPropertyValue("scopedContext", contextHolder.getBeanDefinition());
  		context.addPropertyValue("bareContext", bareContext.getBeanDefinition());
  		context.addPropertyReference("resource", element.getAttribute("resource"));
  
  		builder.addConstructorArgValue(context.getBeanDefinition());
  		if (StringUtils.hasText(accessTokenProviderRef)) {
  			builder.addPropertyReference("accessTokenProvider", accessTokenProviderRef);
  		}
  
  		parserContext.getDelegate().parsePropertyElements(element, builder.getBeanDefinition());
  
  	}
  
  }