1. 应用场景

在各业务操作系统中，组织结构是很常见而且重要的配置。
组织结构是一棵树，创建用户时必须为用户选择一个所属的组织。在部分业务场景中需要根据组织ID筛选该用户能看到的业务数据。
举个栗子：

• 董事长A可以看到所有部门的数据

• 销售部经理可以看到销售部及其子部门所有数据，但无法查看非销售部其他数据

  
  
  image.png

2. 解决思路

• 用户登录成功，查询该用户组织结构IDorgId及其子孙部门IDorgIds，存储这些用户信息到集中缓存redis中
• 用户访问接口时，根据token从redis取出用户信息设置到线程变量ThreadLocal中
• 编写JPA拦截器（Mybatis同理）,为符合条件的SQL进行解析并修改，筛选组织数据

关于该思路的具体介绍，请参考我之前的文章
JPA 表租户 SQL解析实现
Mybatis-Plus租户解析的应用

在基于MybatisPlus租户解析器、jsqlphaserSQL解析工具、JPA拦截器的理解上编写如下代码

3. 代码略长，可以略过看看效果后再研究

import com.kichun.sc.common.config.OrganizationProperties;
import com.kichun.sc.common.context.UserContext;
import com.kichun.sc.common.user.CurrentUser;
import com.kichun.sc.common.util.SpringContextUtil;
import lombok.Data;
import lombok.experimental.Accessors;
import lombok.extern.slf4j.Slf4j;
import net.sf.jsqlparser.expression.*;
import net.sf.jsqlparser.expression.operators.conditional.AndExpression;
import net.sf.jsqlparser.expression.operators.conditional.OrExpression;
import net.sf.jsqlparser.expression.operators.relational.*;
import net.sf.jsqlparser.parser.CCJSqlParserUtil;
import net.sf.jsqlparser.schema.Column;
import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.Statement;
import net.sf.jsqlparser.statement.Statements;
import net.sf.jsqlparser.statement.delete.Delete;
import net.sf.jsqlparser.statement.insert.Insert;
import net.sf.jsqlparser.statement.select.*;
import net.sf.jsqlparser.statement.update.Update;
import org.hibernate.resource.jdbc.spi.StatementInspector;

import java.util.ArrayList;
import java.util.List;

/**
 * 参考Mybatis-Plus插件中的TenantSqlParser进行组织ID解析处理，其实现为使用jsqlparser对sql进行解析，拼装SQL语句
 *
 * @author wangqichang
 * @since 2020/1/12
 */
@Slf4j
@Data
@Accessors(chain = true)
@SuppressWarnings("ALL")
public class OrganizationInterceptor implements StatementInspector {


    private String orgId;

    private List<String> orgIds;

    private List<String> orgTables;

    private String orgIdColumn = "org_id";


    /**
     * 重写StatementInspector的inspect接口，参数为hibernate处理后的原始SQL，返回值为我们修改后的SQL
     *
     * @param sql
     * @return
     */
    @Override
    public String inspect(String sql) {
        try {
            /**
             * 未登录用户，系统用户不做解析
             */
            CurrentUser current = UserContext.current();
            if (UserContext.current() == null || UserContext.current().getAdministrator()) {
                return null;
            }
            /**
             * 初始化需要进行解析的组织表,
             */
            if (orgTables == null) {
                synchronized (OrganizationInterceptor.class) {
                    OrganizationProperties bean = SpringContextUtil.getBean(OrganizationProperties.class);
                    if (bean != null) {
                        orgTables = bean.getTables();
                    } else {
                        throw new RuntimeException("未能获取TenantProperties参数配置");
                    }
                }
            }

            /**
             * 从当前线程获取登录用户的所属用户组织ID及其子孙组织ID
             */
            CurrentUser user = UserContext.current();
            orgId = user.getOrganizationId();
            orgIds = user.getOrganizationIds();

            log.info("组织筛选解析开始，原始SQL：{}", sql);
            Statements statements = CCJSqlParserUtil.parseStatements(sql);
            StringBuilder sqlStringBuilder = new StringBuilder();
            int i = 0;
            for (Statement statement : statements.getStatements()) {
                if (null != statement) {
                    if (i++ > 0) {
                        sqlStringBuilder.append(';');
                    }
                    sqlStringBuilder.append(this.processParser(statement));
                }
            }
            String newSql = sqlStringBuilder.toString();
            log.info("组织筛选解析结束，解析后SQL：{}", newSql);
            return newSql;
        } catch (Exception e) {
            log.error("组织筛选解析失败，解析SQL异常{}", e.getMessage());
            e.printStackTrace();
        } finally {
            orgId = null;
        }
        return null;
    }

    private String processParser(Statement statement) {
        if (statement instanceof Insert) {
            this.processInsert((Insert) statement);
        } else if (statement instanceof Select) {
            this.processSelectBody(((Select) statement).getSelectBody());
        } else if (statement instanceof Update) {
            this.processUpdate((Update) statement);
        } else if (statement instanceof Delete) {
            this.processDelete((Delete) statement);
        }
        /**
         * 返回处理后的SQL
         */
        return statement.toString();
    }

    /**
     * select 语句处理
     */

    public void processSelectBody(SelectBody selectBody) {
        if (selectBody instanceof PlainSelect) {
            processPlainSelect((PlainSelect) selectBody);
        } else if (selectBody instanceof WithItem) {
            WithItem withItem = (WithItem) selectBody;
            if (withItem.getSelectBody() != null) {
                processSelectBody(withItem.getSelectBody());
            }
        } else {
            SetOperationList operationList = (SetOperationList) selectBody;
            if (operationList.getSelects() != null && operationList.getSelects().size() > 0) {
                operationList.getSelects().forEach(this::processSelectBody);
            }
        }
    }

    /**
     * insert 语句处理
     */

    public void processInsert(Insert insert) {
        if (orgTables.contains(insert.getTable().getFullyQualifiedName())) {
            insert.getColumns().add(new Column(orgIdColumn));
            if (insert.getSelect() != null) {
                processPlainSelect((PlainSelect) insert.getSelect().getSelectBody(), true);
            } else if (insert.getItemsList() != null) {
                // fixed github pull/295
                ItemsList itemsList = insert.getItemsList();
                if (itemsList instanceof MultiExpressionList) {
                    ((MultiExpressionList) itemsList).getExprList().forEach(el -> el.getExpressions().add(new StringValue(orgId)));
                } else {
                    ((ExpressionList) insert.getItemsList()).getExpressions().add(new StringValue(orgId));
                }
            } else {
                throw new RuntimeException("Failed to process multiple-table update, please exclude the tableName or statementId");
            }
        }
    }

    /**
     * update 语句处理
     */

    public void processUpdate(Update update) {
        final Table table = update.getTable();
        if (orgTables.contains(table.getFullyQualifiedName())) {
            update.setWhere(this.andExpression(table, update.getWhere()));
        }
    }

    /**
     * delete 语句处理
     */

    public void processDelete(Delete delete) {
        if (orgTables.contains(delete.getTable().getFullyQualifiedName())) {
            delete.setWhere(this.andExpression(delete.getTable(), delete.getWhere()));
        }
    }

    /**
     * delete update 语句 where 处理
     */
    protected BinaryExpression andExpression(Table table, Expression where) {
        //获得where条件表达式
        EqualsTo equalsTo = new EqualsTo();
        equalsTo.setLeftExpression(this.getAliasColumn(table));
        equalsTo.setRightExpression(new StringValue(orgId));
        if (null != where) {
            if (where instanceof OrExpression) {
                return new AndExpression(equalsTo, new Parenthesis(where));
            } else {
                return new AndExpression(equalsTo, where);
            }
        }
        return equalsTo;
    }

    /**
     * 处理 PlainSelect
     */
    protected void processPlainSelect(PlainSelect plainSelect) {
        if (plainSelect.getWhere() != null) {
            processPlainSelect(plainSelect, true);
        } else {
            processPlainSelect(plainSelect, false);
        }

    }

    /**
     * 处理 PlainSelect
     *
     * @param plainSelect ignore
     * @param addColumn   是否添加租户列,insert into select语句中需要
     */
    protected void processPlainSelect(PlainSelect plainSelect, boolean addColumn) {
        FromItem fromItem = plainSelect.getFromItem();
        if (fromItem instanceof Table) {
            Table fromTable = (Table) fromItem;
            if (orgTables.contains(fromTable.getFullyQualifiedName())) {
                //#1186 github
                plainSelect.setWhere(builderExpression(plainSelect.getWhere(), fromTable));
                if (addColumn) {
                    plainSelect.getSelectItems().add(new SelectExpressionItem(new Column(orgIdColumn)));
                }
            }
        } else {
            processFromItem(fromItem);
        }
        List<Join> joins = plainSelect.getJoins();
        if (joins != null && joins.size() > 0) {
            joins.forEach(j -> {
                processJoin(j);
                processFromItem(j.getRightItem());
            });
        }
    }

    /**
     * 处理子查询等
     */
    protected void processFromItem(FromItem fromItem) {
        if (fromItem instanceof SubJoin) {
            SubJoin subJoin = (SubJoin) fromItem;
            if (subJoin.getJoinList() != null) {
                subJoin.getJoinList().forEach(this::processJoin);
            }
            if (subJoin.getLeft() != null) {
                processFromItem(subJoin.getLeft());
            }
        } else if (fromItem instanceof SubSelect) {
            SubSelect subSelect = (SubSelect) fromItem;
            if (subSelect.getSelectBody() != null) {
                processSelectBody(subSelect.getSelectBody());
            }
        } else if (fromItem instanceof ValuesList) {
            log.debug("Perform a subquery, if you do not give us feedback");
        } else if (fromItem instanceof LateralSubSelect) {
            LateralSubSelect lateralSubSelect = (LateralSubSelect) fromItem;
            if (lateralSubSelect.getSubSelect() != null) {
                SubSelect subSelect = lateralSubSelect.getSubSelect();
                if (subSelect.getSelectBody() != null) {
                    processSelectBody(subSelect.getSelectBody());
                }
            }
        }
    }

    /**
     * 处理联接语句
     */
    protected void processJoin(Join join) {
        if (join.getRightItem() instanceof Table) {
            Table fromTable = (Table) join.getRightItem();
            if (orgTables.contains(fromTable.getFullyQualifiedName())) {
                join.setOnExpression(builderExpression(join.getOnExpression(), fromTable));
            }
        }
    }

    /**
     * 处理条件:
     * 创建InExpression，即封装where orgId in ('','')
     */
    protected Expression builderExpression(Expression currentExpression, Table table) {
        final InExpression organizationExpression = new InExpression();
        List<Expression> expressions = new ArrayList<>();
        orgIds.forEach(organizatinId -> {
            expressions.add(new StringValue(organizatinId));
        });
        ExpressionList expressionList = new ExpressionList(expressions);
        organizationExpression.setLeftExpression(this.getAliasColumn(table));
        organizationExpression.setRightItemsList(expressionList);

        Expression appendExpression  =  null;
        if (!(organizationExpression instanceof SupportsOldOracleJoinSyntax)) {
            appendExpression = new EqualsTo();
            ((EqualsTo) appendExpression).setLeftExpression(this.getAliasColumn(table));
            ((EqualsTo) appendExpression).setRightExpression(organizationExpression);
        }
        if (currentExpression == null) {
            return organizationExpression;
        }else {
            appendExpression  = organizationExpression;
        }
        if (currentExpression instanceof BinaryExpression) {
            BinaryExpression binaryExpression = (BinaryExpression) currentExpression;
            doExpression(binaryExpression.getLeftExpression());
            doExpression(binaryExpression.getRightExpression());
        } else if (currentExpression instanceof InExpression) {
            InExpression inExp = (InExpression) currentExpression;
            ItemsList rightItems = inExp.getRightItemsList();
            if (rightItems instanceof SubSelect) {
                processSelectBody(((SubSelect) rightItems).getSelectBody());
            }
        }
        if (currentExpression instanceof OrExpression) {
            return new AndExpression(new Parenthesis(currentExpression), appendExpression);
        } else {
            return new AndExpression(currentExpression, appendExpression);
        }
    }

    protected void doExpression(Expression expression) {
        if (expression instanceof FromItem) {
            processFromItem((FromItem) expression);
        } else if (expression instanceof InExpression) {
            InExpression inExp = (InExpression) expression;
            ItemsList rightItems = inExp.getRightItemsList();
            if (rightItems instanceof SubSelect) {
                processSelectBody(((SubSelect) rightItems).getSelectBody());
            }
        }
    }


    /**
     * 租户字段别名设置
     * <p>tableName.orgId 或 tableAlias.orgId</p>
     *
     * @param table 表对象
     * @return 字段
     */
    protected Column getAliasColumn(Table table) {
        StringBuilder column = new StringBuilder();
        if (null == table.getAlias()) {
            column.append(table.getName());
        } else {
            column.append(table.getAlias().getName());
        }
        column.append(".");
        column.append(orgIdColumn);
        return new Column(column.toString());
    }

}

4. 效果展示

如日志展示，拦截器为SQL添加了
WHERE user0_.org_id IN ('40285b8162669b9c016266a0a5320001', '40285b816266a8a2016266ad53360002', '40285b816266a8a2016266ad6c910003', '40285b816266a8a2016266ad85ae0004', '40285b816266a8a2016266ad9f3c0005')
这行代码，限制了该用户只能查看sys_user表中部分有访问权限的组织ID的数据

2020-01-12 14:56:44.037  INFO 16500 --- [nio-9050-exec-1] c.t.s.c.i.OrganizationInterceptor        : 组织筛选解析开始，原始SQL：select user0_.id as id1_10_, user0_.create_date as create_d2_10_, user0_.update_date as update_d3_10_, user0_.administrator as administ4_10_, user0_.org_id as org_id5_10_, user0_.password as password6_10_, user0_.real_name as real_nam7_10_, user0_.tenant_id as tenant_i8_10_, user0_.user_name as user_nam9_10_ from sys_user user0_ limit ?
2020-01-12 14:56:44.039  INFO 16500 --- [nio-9050-exec-1] c.t.s.c.i.OrganizationInterceptor        : 组织筛选解析结束，解析后SQL：SELECT user0_.id AS id1_10_, user0_.create_date AS create_d2_10_, user0_.update_date AS update_d3_10_, user0_.administrator AS administ4_10_, user0_.org_id AS org_id5_10_, user0_.password AS password6_10_, user0_.real_name AS real_nam7_10_, user0_.tenant_id AS tenant_i8_10_, user0_.user_name AS user_nam9_10_ FROM sys_user user0_ WHERE user0_.org_id IN ('40285b8162669b9c016266a0a5320001', '40285b816266a8a2016266ad53360002', '40285b816266a8a2016266ad6c910003', '40285b816266a8a2016266ad85ae0004', '40285b816266a8a2016266ad9f3c0005') LIMIT ?