content: package com.xiliu.server.common.aspect;
  
  import cn.hutool.core.convert.Convert;
  import com.xiliu.common.annotation.DataScope;
  import com.xiliu.common.context.SecurityContextHolder;
  import com.xiliu.common.domain.BaseEntity;
  import com.xiliu.common.utils.StringUtils;
  import com.xiliu.server.common.domain.LoginUser;
  import com.xiliu.server.modules.system.entity.XlRole;
  import com.xiliu.server.modules.system.entity.XlUser;
  import com.xiliu.server.utils.SecurityUtils;
  import org.aspectj.lang.JoinPoint;
  import org.aspectj.lang.annotation.Aspect;
  import org.aspectj.lang.annotation.Before;
  import org.springframework.stereotype.Component;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * 数据过滤处理
   *
   * @author vctgo
   */
  @Aspect
  @Component
  public class DataScopeAspect
  {
      /**
       * 全部数据权限
       */
      public static final String DATA_SCOPE_ALL = "1";
  
      /**
       * 自定数据权限
       */
      public static final String DATA_SCOPE_CUSTOM = "2";
  
      /**
       * 部门数据权限
       */
      public static final String DATA_SCOPE_DEPT = "3";
  
      /**
       * 部门及以下数据权限
       */
      public static final String DATA_SCOPE_DEPT_AND_CHILD = "4";
  
      /**
       * 仅本人数据权限
       */
      public static final String DATA_SCOPE_SELF = "5";
  
      /**
       * 数据权限过滤关键字
       */
      public static final String DATA_SCOPE = "dataScope";
  
      @Before("@annotation(controllerDataScope)")
      public void doBefore(JoinPoint point, DataScope controllerDataScope) throws Throwable {
          clearDataScope(point);
          handleDataScope(point, controllerDataScope);
      }
  
      protected void handleDataScope(final JoinPoint joinPoint, DataScope controllerDataScope) {
          if (controllerDataScope == null) {
              return;
          }
          // 获取当前的用户
          LoginUser loginUser = SecurityUtils.getLoginUser();
          if (StringUtils.isNotNull(loginUser)) {
              XlUser currentUser = loginUser.getUser();
              // 如果是超级管理员，则不过滤数据
              if (StringUtils.isNotNull(currentUser) && !currentUser.isAdmin()) {
                  String permission = StringUtils.defaultIfEmpty(controllerDataScope.permission(), SecurityContextHolder.getPermission());
                  dataScopeFilter(joinPoint, currentUser, controllerDataScope.deptAlias(),
                          controllerDataScope.userAlias(), permission);
              }
          }
      }
  
      /**
       * 数据范围过滤
       *
       * @param joinPoint 切点
       * @param user 用户
       * @param deptAlias 部门别名
       * @param userAlias 用户别名
       * @param permission 权限字符
       */
      public static void dataScopeFilter(JoinPoint joinPoint, XlUser user, String deptAlias, String userAlias, String permission)
      {
          StringBuilder sqlString = new StringBuilder();
          List<String> conditions = new ArrayList<String>();
          for (XlRole role : user.getRoles()) {
              String dataScope = role.getDataScope();
              if (!DATA_SCOPE_CUSTOM.equals(dataScope) && conditions.contains(dataScope)) {
                  continue;
              }
              if (StringUtils.isNotEmpty(permission) && StringUtils.isNotEmpty(role.getPermissions())
                      && !StringUtils.containsAny(role.getPermissions(), Convert.toStrArray(permission))) {
                  continue;
              }
              if (DATA_SCOPE_ALL.equals(dataScope)) {
                  sqlString = new StringBuilder();
                  break;
              } else if (DATA_SCOPE_CUSTOM.equals(dataScope)) {
                  sqlString.append(StringUtils.format(
                          " OR {}.dept_id IN ( SELECT dept_id FROM xl_role_dept WHERE role_id = {} ) ", deptAlias,
                          role.getRoleId()));
              } else if (DATA_SCOPE_DEPT.equals(dataScope)) {
                  sqlString.append(StringUtils.format(" OR {}.dept_id = {} ", deptAlias, user.getDeptId()));
              } else if (DATA_SCOPE_DEPT_AND_CHILD.equals(dataScope)) {
                  sqlString.append(StringUtils.format(
                          " OR {}.dept_id IN ( SELECT dept_id FROM xl_dept WHERE dept_id = {} or find_in_set( {} , ancestors ) )",
                          deptAlias, user.getDeptId(), user.getDeptId()));
              } else if (DATA_SCOPE_SELF.equals(dataScope)) {
                  if (StringUtils.isNotBlank(userAlias)) {
                      sqlString.append(StringUtils.format(" OR {}.user_id = {} ", userAlias, user.getUserId()));
                  } else {
                      // 数据权限为仅本人且没有userAlias别名不查询任何数据
                      sqlString.append(StringUtils.format(" OR {}.dept_id = 0 ", deptAlias));
                  }
              }
              conditions.add(dataScope);
          }
  
          if (StringUtils.isNotBlank(sqlString.toString())) {
              Object params = joinPoint.getArgs()[0];
              if (StringUtils.isNotNull(params) && params instanceof BaseEntity) {
                  BaseEntity baseEntity = (BaseEntity) params;
                  baseEntity.getParams().put(DATA_SCOPE, " AND (" + sqlString.substring(4) + ")");
              }
          }
      }
  
      /**
       * 拼接权限sql前先清空params.dataScope参数防止注入
       */
      private void clearDataScope(final JoinPoint joinPoint) {
          Object params = joinPoint.getArgs()[0];
          if (StringUtils.isNotNull(params) && params instanceof BaseEntity) {
              BaseEntity baseEntity = (BaseEntity) params;
              baseEntity.getParams().put(DATA_SCOPE, "");
          }
      }
  
  }
  