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.dashboard.controller.gateway;
  
  import com.alibaba.csp.sentinel.dashboard.auth.AuthAction;
  import com.alibaba.csp.sentinel.dashboard.auth.AuthService;
  import com.alibaba.csp.sentinel.dashboard.client.SentinelApiClient;
  import com.alibaba.csp.sentinel.dashboard.datasource.entity.gateway.ApiDefinitionEntity;
  import com.alibaba.csp.sentinel.dashboard.datasource.entity.gateway.ApiPredicateItemEntity;
  import com.alibaba.csp.sentinel.dashboard.discovery.MachineInfo;
  import com.alibaba.csp.sentinel.dashboard.domain.Result;
  import com.alibaba.csp.sentinel.dashboard.domain.vo.gateway.api.AddApiReqVo;
  import com.alibaba.csp.sentinel.dashboard.domain.vo.gateway.api.ApiPredicateItemVo;
  import com.alibaba.csp.sentinel.dashboard.domain.vo.gateway.api.UpdateApiReqVo;
  import com.alibaba.csp.sentinel.dashboard.repository.gateway.InMemApiDefinitionStore;
  import com.alibaba.csp.sentinel.util.StringUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.util.CollectionUtils;
  import org.springframework.web.bind.annotation.*;
  
  import javax.servlet.http.HttpServletRequest;
  import java.util.*;
  
  import static com.alibaba.csp.sentinel.adapter.gateway.common.SentinelGatewayConstants.*;
  
  /**
   * Gateway api Controller for manage gateway api definitions.
   *
   * @author cdfive
   * @since 1.7.0
   */
  @RestController
  @RequestMapping(value = "/gateway/api")
  public class GatewayApiController {
  
      private final Logger logger = LoggerFactory.getLogger(GatewayApiController.class);
  
      @Autowired
      private InMemApiDefinitionStore repository;
  
      @Autowired
      private SentinelApiClient sentinelApiClient;
  
      @GetMapping("/list.json")
      @AuthAction(AuthService.PrivilegeType.READ_RULE)
      public Result<List<ApiDefinitionEntity>> queryApis(String app, String ip, Integer port) {
  
          if (StringUtil.isEmpty(app)) {
              return Result.ofFail(-1, "app can't be null or empty");
          }
          if (StringUtil.isEmpty(ip)) {
              return Result.ofFail(-1, "ip can't be null or empty");
          }
          if (port == null) {
              return Result.ofFail(-1, "port can't be null");
          }
  
          try {
              List<ApiDefinitionEntity> apis = sentinelApiClient.fetchApis(app, ip, port).get();
              repository.saveAll(apis);
              return Result.ofSuccess(apis);
          } catch (Throwable throwable) {
              logger.error("queryApis error:", throwable);
              return Result.ofThrowable(-1, throwable);
          }
      }
  
      @PostMapping("/new.json")
      @AuthAction(AuthService.PrivilegeType.WRITE_RULE)
      public Result<ApiDefinitionEntity> addApi(HttpServletRequest request, @RequestBody AddApiReqVo reqVo) {
  
          String app = reqVo.getApp();
          if (StringUtil.isBlank(app)) {
              return Result.ofFail(-1, "app can't be null or empty");
          }
  
          ApiDefinitionEntity entity = new ApiDefinitionEntity();
          entity.setApp(app.trim());
  
          String ip = reqVo.getIp();
          if (StringUtil.isBlank(ip)) {
              return Result.ofFail(-1, "ip can't be null or empty");
          }
          entity.setIp(ip.trim());
  
          Integer port = reqVo.getPort();
          if (port == null) {
              return Result.ofFail(-1, "port can't be null");
          }
          entity.setPort(port);
  
          // API名称
          String apiName = reqVo.getApiName();
          if (StringUtil.isBlank(apiName)) {
              return Result.ofFail(-1, "apiName can't be null or empty");
          }
          entity.setApiName(apiName.trim());
  
          // 匹配规则列表
          List<ApiPredicateItemVo> predicateItems = reqVo.getPredicateItems();
          if (CollectionUtils.isEmpty(predicateItems)) {
              return Result.ofFail(-1, "predicateItems can't empty");
          }
  
          List<ApiPredicateItemEntity> predicateItemEntities = new ArrayList<>();
          for (ApiPredicateItemVo predicateItem : predicateItems) {
              ApiPredicateItemEntity predicateItemEntity = new ApiPredicateItemEntity();
  
              // 匹配模式
              Integer matchStrategy = predicateItem.getMatchStrategy();
              if (!Arrays.asList(URL_MATCH_STRATEGY_EXACT, URL_MATCH_STRATEGY_PREFIX, URL_MATCH_STRATEGY_REGEX).contains(matchStrategy)) {
                  return Result.ofFail(-1, "invalid matchStrategy: " + matchStrategy);
              }
              predicateItemEntity.setMatchStrategy(matchStrategy);
  
              // 匹配串
              String pattern = predicateItem.getPattern();
              if (StringUtil.isBlank(pattern)) {
                  return Result.ofFail(-1, "pattern can't be null or empty");
              }
              predicateItemEntity.setPattern(pattern);
  
              predicateItemEntities.add(predicateItemEntity);
          }
          entity.setPredicateItems(new LinkedHashSet<>(predicateItemEntities));
  
          // 检查API名称不能重复
          List<ApiDefinitionEntity> allApis = repository.findAllByMachine(MachineInfo.of(app.trim(), ip.trim(), port));
          if (allApis.stream().map(o -> o.getApiName()).anyMatch(o -> o.equals(apiName.trim()))) {
              return Result.ofFail(-1, "apiName exists: " + apiName);
          }
  
          Date date = new Date();
          entity.setGmtCreate(date);
          entity.setGmtModified(date);
  
          try {
              entity = repository.save(entity);
          } catch (Throwable throwable) {
              logger.error("add gateway api error:", throwable);
              return Result.ofThrowable(-1, throwable);
          }
  
          if (!publishApis(app, ip, port)) {
              logger.warn("publish gateway apis fail after add");
          }
  
          return Result.ofSuccess(entity);
      }
  
      @PostMapping("/save.json")
      @AuthAction(AuthService.PrivilegeType.WRITE_RULE)
      public Result<ApiDefinitionEntity> updateApi(@RequestBody UpdateApiReqVo reqVo) {
          String app = reqVo.getApp();
          if (StringUtil.isBlank(app)) {
              return Result.ofFail(-1, "app can't be null or empty");
          }
  
          Long id = reqVo.getId();
          if (id == null) {
              return Result.ofFail(-1, "id can't be null");
          }
  
          ApiDefinitionEntity entity = repository.findById(id);
          if (entity == null) {
              return Result.ofFail(-1, "api does not exist, id=" + id);
          }
  
          // 匹配规则列表
          List<ApiPredicateItemVo> predicateItems = reqVo.getPredicateItems();
          if (CollectionUtils.isEmpty(predicateItems)) {
              return Result.ofFail(-1, "predicateItems can't empty");
          }
  
          List<ApiPredicateItemEntity> predicateItemEntities = new ArrayList<>();
          for (ApiPredicateItemVo predicateItem : predicateItems) {
              ApiPredicateItemEntity predicateItemEntity = new ApiPredicateItemEntity();
  
              // 匹配模式
              int matchStrategy = predicateItem.getMatchStrategy();
              if (!Arrays.asList(URL_MATCH_STRATEGY_EXACT, URL_MATCH_STRATEGY_PREFIX, URL_MATCH_STRATEGY_REGEX).contains(matchStrategy)) {
                  return Result.ofFail(-1, "Invalid matchStrategy: " + matchStrategy);
              }
              predicateItemEntity.setMatchStrategy(matchStrategy);
  
              // 匹配串
              String pattern = predicateItem.getPattern();
              if (StringUtil.isBlank(pattern)) {
                  return Result.ofFail(-1, "pattern can't be null or empty");
              }
              predicateItemEntity.setPattern(pattern);
  
              predicateItemEntities.add(predicateItemEntity);
          }
          entity.setPredicateItems(new LinkedHashSet<>(predicateItemEntities));
  
          Date date = new Date();
          entity.setGmtModified(date);
  
          try {
              entity = repository.save(entity);
          } catch (Throwable throwable) {
              logger.error("update gateway api error:", throwable);
              return Result.ofThrowable(-1, throwable);
          }
  
          if (!publishApis(app, entity.getIp(), entity.getPort())) {
              logger.warn("publish gateway apis fail after update");
          }
  
          return Result.ofSuccess(entity);
      }
  
      @PostMapping("/delete.json")
      @AuthAction(AuthService.PrivilegeType.DELETE_RULE)
  
      public Result<Long> deleteApi(Long id) {
          if (id == null) {
              return Result.ofFail(-1, "id can't be null");
          }
  
          ApiDefinitionEntity oldEntity = repository.findById(id);
          if (oldEntity == null) {
              return Result.ofSuccess(null);
          }
  
          try {
              repository.delete(id);
          } catch (Throwable throwable) {
              logger.error("delete gateway api error:", throwable);
              return Result.ofThrowable(-1, throwable);
          }
  
          if (!publishApis(oldEntity.getApp(), oldEntity.getIp(), oldEntity.getPort())) {
              logger.warn("publish gateway apis fail after delete");
          }
  
          return Result.ofSuccess(id);
      }
  
      private boolean publishApis(String app, String ip, Integer port) {
          List<ApiDefinitionEntity> apis = repository.findAllByMachine(MachineInfo.of(app, ip, port));
          return sentinelApiClient.modifyApis(app, ip, port, apis);
      }
  }
  