content: /*
   * Copyright 1999-2020 Alibaba Group Holding Ltd.
   *
   * 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.csp.sentinel.adapter.jaxrs;
  
  import com.alibaba.csp.sentinel.*;
  import com.alibaba.csp.sentinel.adapter.jaxrs.config.SentinelJaxRsConfig;
  import com.alibaba.csp.sentinel.context.ContextUtil;
  import com.alibaba.csp.sentinel.slots.block.BlockException;
  import com.alibaba.csp.sentinel.util.StringUtil;
  
  import javax.ws.rs.container.*;
  import javax.ws.rs.core.Context;
  import javax.ws.rs.ext.Provider;
  import java.io.IOException;
  
  /**
   * @author sea
   */
  @Provider
  public class SentinelJaxRsProviderFilter implements ContainerRequestFilter, ContainerResponseFilter {
  
      private static final String SENTINEL_JAX_RS_PROVIDER_CONTEXT_NAME = "sentinel_jax_rs_provider_context";
  
  
      private static final String SENTINEL_JAX_RS_PROVIDER_ENTRY_PROPERTY = "sentinel_jax_rs_provider_entry_property";
  
      @Context
      private ResourceInfo resourceInfo;
  
      @Override
      public void filter(ContainerRequestContext containerRequestContext) throws IOException {
  
          try {
              String resourceName = getResourceName(containerRequestContext, resourceInfo);
  
              if (StringUtil.isNotEmpty(resourceName)) {
                  // Parse the request origin using registered origin parser.
                  String origin = parseOrigin(containerRequestContext);
                  String contextName = getContextName(containerRequestContext);
                  ContextUtil.enter(contextName, origin);
                  Entry entry = SphU.entry(resourceName, ResourceTypeConstants.COMMON_WEB, EntryType.IN);
  
                  containerRequestContext.setProperty(SENTINEL_JAX_RS_PROVIDER_ENTRY_PROPERTY, entry);
              }
          } catch (BlockException e) {
              try {
                  containerRequestContext.abortWith(SentinelJaxRsConfig.getJaxRsFallback().fallbackResponse(containerRequestContext.getUriInfo().getPath(), e));
              } finally {
                  ContextUtil.exit();
              }
          }
      }
  
      @Override
      public void filter(ContainerRequestContext containerRequestContext, ContainerResponseContext containerResponseContext) throws IOException {
          Entry entry = (Entry) containerRequestContext.getProperty(SENTINEL_JAX_RS_PROVIDER_ENTRY_PROPERTY);
          if (entry != null) {
              entry.exit();
          }
          containerRequestContext.removeProperty(SENTINEL_JAX_RS_PROVIDER_ENTRY_PROPERTY);
          ContextUtil.exit();
      }
  
      public String getResourceName(ContainerRequestContext containerRequestContext, ResourceInfo resourceInfo) {
          return SentinelJaxRsConfig.getResourceNameParser().parse(containerRequestContext, resourceInfo);
      }
  
      protected String getContextName(ContainerRequestContext request) {
          return SENTINEL_JAX_RS_PROVIDER_CONTEXT_NAME;
      }
  
      protected String parseOrigin(ContainerRequestContext request) {
          return SentinelJaxRsConfig.getRequestOriginParser().parseOrigin(request);
      }
  }
  