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.gateway;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Map.Entry;
  
  import com.alibaba.cloud.sentinel.datasource.converter.JsonConverter;
  import com.alibaba.cloud.sentinel.datasource.converter.XmlConverter;
  import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiDefinition;
  import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiPathPredicateItem;
  import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiPredicateGroupItem;
  import com.alibaba.csp.sentinel.adapter.gateway.common.api.ApiPredicateItem;
  import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayFlowRule;
  import com.fasterxml.jackson.core.JsonParser;
  import com.fasterxml.jackson.core.Version;
  import com.fasterxml.jackson.databind.DeserializationContext;
  import com.fasterxml.jackson.databind.DeserializationFeature;
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
  import com.fasterxml.jackson.databind.module.SimpleModule;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  import com.fasterxml.jackson.dataformat.xml.XmlMapper;
  
  import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  
  /**
   * @author <a href="mailto:fangjian0423@gmail.com">Jim</a>
   */
  @Configuration(proxyBeanMethods = false)
  @ConditionalOnProperty(name = "spring.cloud.sentinel.enabled", matchIfMissing = true)
  public class SentinelGatewayAutoConfiguration {
  
  	@ConditionalOnClass(ObjectMapper.class)
  	@Configuration(proxyBeanMethods = false)
  	protected static class SentinelConverterConfiguration {
  
  		static class ApiPredicateItemDeserializer
  				extends StdDeserializer<ApiPredicateItem> {
  
  			private Map<String, Class<? extends ApiPredicateItem>> registry = new HashMap<String, Class<? extends ApiPredicateItem>>();
  
  			ApiPredicateItemDeserializer() {
  				super(ApiPredicateItem.class);
  			}
  
  			void registerApiPredicateItem(String uniqueAttribute,
  					Class<? extends ApiPredicateItem> apiPredicateItemClass) {
  				registry.put(uniqueAttribute, apiPredicateItemClass);
  			}
  
  			@Override
  			public ApiPredicateItem deserialize(JsonParser jp,
  					DeserializationContext ctxt) throws IOException {
  				ObjectMapper mapper = (ObjectMapper) jp.getCodec();
  				ObjectNode root = mapper.readTree(jp);
  				Class<? extends ApiPredicateItem> apiPredicateItemClass = null;
  				Iterator<Entry<String, JsonNode>> elementsIterator = root.fields();
  				while (elementsIterator.hasNext()) {
  					Entry<String, JsonNode> element = elementsIterator.next();
  					String name = element.getKey();
  					if (registry.containsKey(name)) {
  						apiPredicateItemClass = registry.get(name);
  						break;
  					}
  				}
  				if (apiPredicateItemClass == null) {
  					return null;
  				}
  				return mapper.readValue(root.toString(), apiPredicateItemClass);
  			}
  
  		}
  
  		@Configuration(proxyBeanMethods = false)
  		protected static class SentinelJsonConfiguration {
  
  			private ObjectMapper objectMapper = new ObjectMapper();
  
  			public SentinelJsonConfiguration() {
  				objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,
  						false);
  
  				ApiPredicateItemDeserializer deserializer = new ApiPredicateItemDeserializer();
  				deserializer.registerApiPredicateItem("pattern",
  						ApiPathPredicateItem.class);
  				deserializer.registerApiPredicateItem("items",
  						ApiPredicateGroupItem.class);
  				SimpleModule module = new SimpleModule(
  						"PolymorphicApiPredicateItemDeserializerModule",
  						new Version(1, 0, 0, null, null, null));
  				module.addDeserializer(ApiPredicateItem.class, deserializer);
  				objectMapper.registerModule(module);
  			}
  
  			@Bean("sentinel-json-gw-flow-converter")
  			public JsonConverter jsonGatewayFlowConverter() {
  				return new JsonConverter(objectMapper, GatewayFlowRule.class);
  			}
  
  			@Bean("sentinel-json-gw-api-group-converter")
  			public JsonConverter jsonApiConverter() {
  				return new JsonConverter(objectMapper, ApiDefinition.class);
  			}
  
  		}
  
  		@ConditionalOnClass(XmlMapper.class)
  		@Configuration(proxyBeanMethods = false)
  		protected static class SentinelXmlConfiguration {
  
  			private XmlMapper xmlMapper = new XmlMapper();
  
  			public SentinelXmlConfiguration() {
  				xmlMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,
  						false);
  				ApiPredicateItemDeserializer deserializer = new ApiPredicateItemDeserializer();
  				deserializer.registerApiPredicateItem("pattern",
  						ApiPathPredicateItem.class);
  				deserializer.registerApiPredicateItem("items",
  						ApiPredicateGroupItem.class);
  				SimpleModule module = new SimpleModule(
  						"PolymorphicGatewayDeserializerModule",
  						new Version(1, 0, 0, null, null, null));
  				module.addDeserializer(ApiPredicateItem.class, deserializer);
  				xmlMapper.registerModule(module);
  			}
  
  			@Bean("sentinel-xml-gw-flow-converter")
  			public XmlConverter xmlGatewayFlowConverter() {
  				return new XmlConverter(xmlMapper, GatewayFlowRule.class);
  			}
  
  			@Bean("sentinel-xml-gw-api-group-converter")
  			public XmlConverter xmlApiConverter() {
  				return new XmlConverter(xmlMapper, ApiDefinition.class);
  			}
  
  		}
  
  	}
  
  }
  