content: /*
   * Copyright 2013-2023 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 com.alibaba.cloud.sentinel;
  
  import java.util.Optional;
  
  import com.alibaba.csp.sentinel.adapter.spring.webmvc_v6x.SentinelWebInterceptor;
  import com.alibaba.csp.sentinel.adapter.spring.webmvc_v6x.callback.BlockExceptionHandler;
  import com.alibaba.csp.sentinel.adapter.spring.webmvc_v6x.callback.DefaultBlockExceptionHandler;
  import com.alibaba.csp.sentinel.adapter.spring.webmvc_v6x.callback.RequestOriginParser;
  import com.alibaba.csp.sentinel.adapter.spring.webmvc_v6x.config.SentinelWebMvcConfig;
  import com.alibaba.csp.sentinel.adapter.web.common.UrlCleaner;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
  import org.springframework.boot.context.properties.EnableConfigurationProperties;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.util.StringUtils;
  import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
  
  /**
   * @author xiaojing
   * @author yuhuangbin
   */
  @Configuration(proxyBeanMethods = false)
  @ConditionalOnWebApplication(type = Type.SERVLET)
  @ConditionalOnProperty(name = "spring.cloud.sentinel.enabled", matchIfMissing = true)
  @ConditionalOnClass(SentinelWebInterceptor.class)
  @EnableConfigurationProperties(SentinelProperties.class)
  public class SentinelWebAutoConfiguration implements WebMvcConfigurer {
  
  	private static final Logger log = LoggerFactory
  			.getLogger(SentinelWebAutoConfiguration.class);
  
  	@Autowired
  	private SentinelProperties properties;
  
  	@Autowired
  	private Optional<UrlCleaner> urlCleanerOptional;
  
  	@Autowired
  	private Optional<BlockExceptionHandler> blockExceptionHandlerOptional;
  
  	@Autowired
  	private Optional<RequestOriginParser> requestOriginParserOptional;
  
  	@Bean
  	@ConditionalOnProperty(name = "spring.cloud.sentinel.filter.enabled",
  			matchIfMissing = true)
  	public SentinelWebInterceptor sentinelWebInterceptor(
  			SentinelWebMvcConfig sentinelWebMvcConfig) {
  		return new SentinelWebInterceptor(sentinelWebMvcConfig);
  	}
  
  	@Bean
  	@ConditionalOnProperty(name = "spring.cloud.sentinel.filter.enabled",
  			matchIfMissing = true)
  	public SentinelWebMvcConfig sentinelWebMvcConfig() {
  		SentinelWebMvcConfig sentinelWebMvcConfig = new SentinelWebMvcConfig();
  		sentinelWebMvcConfig.setHttpMethodSpecify(properties.getHttpMethodSpecify());
  		sentinelWebMvcConfig.setWebContextUnify(properties.getWebContextUnify());
  
  		if (blockExceptionHandlerOptional.isPresent()) {
  			blockExceptionHandlerOptional
  					.ifPresent(sentinelWebMvcConfig::setBlockExceptionHandler);
  		}
  		else {
  			if (StringUtils.hasText(properties.getBlockPage())) {
  				sentinelWebMvcConfig.setBlockExceptionHandler(
  						(request, response, resourceName, e) ->
  								response.sendRedirect(properties.getBlockPage())
  				);
  			}
  			else {
  				sentinelWebMvcConfig
  						.setBlockExceptionHandler(new DefaultBlockExceptionHandler());
  			}
  		}
  
  		urlCleanerOptional.ifPresent(sentinelWebMvcConfig::setUrlCleaner);
  		requestOriginParserOptional.ifPresent(sentinelWebMvcConfig::setOriginParser);
  		return sentinelWebMvcConfig;
  	}
  
  	@Bean
  	@ConditionalOnProperty(name = "spring.cloud.sentinel.filter.enabled",
  			matchIfMissing = true)
  	public SentinelWebMvcConfigurer sentinelWebMvcConfigurer() {
  		return new SentinelWebMvcConfigurer();
  	}
  
  }
  