content: /*
   * Copyright 1999-2019 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.gateway.zuul.api.matcher;
  
  import com.alibaba.csp.sentinel.adapter.gateway.common.SentinelGatewayConstants;
  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.ApiPredicateItem;
  import com.alibaba.csp.sentinel.adapter.gateway.common.api.matcher.AbstractApiMatcher;
  import com.alibaba.csp.sentinel.adapter.gateway.zuul.api.route.ZuulRouteMatchers;
  import com.alibaba.csp.sentinel.util.StringUtil;
  import com.alibaba.csp.sentinel.util.function.Predicate;
  
  import com.netflix.zuul.context.RequestContext;
  
  /**
   * @author Eric Zhao
   * @since 1.6.0
   */
  public class RequestContextApiMatcher extends AbstractApiMatcher<RequestContext> {
  
      public RequestContextApiMatcher(ApiDefinition apiDefinition) {
          super(apiDefinition);
      }
  
      @Override
      protected void initializeMatchers() {
          if (apiDefinition.getPredicateItems() != null) {
              for (ApiPredicateItem item : apiDefinition.getPredicateItems()) {
                  Predicate<RequestContext> predicate = fromApiPredicate(item);
                  if (predicate != null) {
                      matchers.add(predicate);
                  }
              }
          }
      }
  
      private Predicate<RequestContext> fromApiPredicate(/*@NonNull*/ ApiPredicateItem item) {
          if (item instanceof ApiPathPredicateItem) {
              return fromApiPathPredicate((ApiPathPredicateItem)item);
          }
          return null;
      }
  
      private Predicate<RequestContext> fromApiPathPredicate(/*@Valid*/ ApiPathPredicateItem item) {
          String pattern = item.getPattern();
          if (StringUtil.isBlank(pattern)) {
              return null;
          }
          switch (item.getMatchStrategy()) {
              case SentinelGatewayConstants.URL_MATCH_STRATEGY_REGEX:
                  return ZuulRouteMatchers.regexPath(pattern);
              case SentinelGatewayConstants.URL_MATCH_STRATEGY_PREFIX:
                  return ZuulRouteMatchers.antPath(pattern);
              default:
                  return ZuulRouteMatchers.exactPath(pattern);
          }
      }
  }
  