content: /*
   * Copyright 1999-2018 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
   *
   *      http://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.slots.block.authority;
  
  import com.alibaba.csp.sentinel.context.Context;
  import com.alibaba.csp.sentinel.slots.block.RuleConstant;
  import com.alibaba.csp.sentinel.util.StringUtil;
  
  /**
   * Rule checker for white/black list authority.
   *
   * @author Eric Zhao
   * @since 0.2.0
   */
  final class AuthorityRuleChecker {
  
      static boolean passCheck(AuthorityRule rule, Context context) {
          String requester = context.getOrigin();
  
          // Empty origin or empty limitApp will pass.
          if (StringUtil.isEmpty(requester) || StringUtil.isEmpty(rule.getLimitApp())) {
              return true;
          }
  
          // Do exact match with origin name.
          int pos = rule.getLimitApp().indexOf(requester);
          boolean contain = pos > -1;
  
          if (contain) {
              boolean exactlyMatch = false;
              String[] appArray = rule.getLimitApp().split(",");
              for (String app : appArray) {
                  if (requester.equals(app)) {
                      exactlyMatch = true;
                      break;
                  }
              }
  
              contain = exactlyMatch;
          }
  
          int strategy = rule.getStrategy();
          if (strategy == RuleConstant.AUTHORITY_BLACK && contain) {
              return false;
          }
  
          if (strategy == RuleConstant.AUTHORITY_WHITE && !contain) {
              return false;
          }
  
          return true;
      }
  
      private AuthorityRuleChecker() {}
  }
  