MyBatisPlus数据权限控制实现的三种方式

@Bean
public MybatisPlusInterceptor paginationInterceptor() {
    MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
    PaginationInnerInterceptor paginationInnerInterceptor = new PaginationInnerInterceptor();
    paginationInnerInterceptor.setDbType(DbType.MYSQL);
    paginationInnerInterceptor.setMaxLimit(1000L);
    paginationInnerInterceptor.setOverflow(true);
    interceptor.addInnerInterceptor(paginationInnerInterceptor);
    interceptor.addInnerInterceptor(new CustomLineInnerInterceptor(new com.szls.config.DataPermissionHandler() {
        @Override
        public Expression getCreateUser() {
            //这里直接写死admin,实际按需获取
            return new StringValue("admin");
        }

        @Override
        public String getCreateUserColumn() {
            return DataPermissionHandler.super.getCreateUserColumn();
        }

        @Override
        public boolean ignoreTable(String tableName) {
            //这是案例，多表需要过滤时，可从配置文件或者static代码块中获取
            List<String> ignoreTables = Collections.singletonList("sys_model_relation");
            //判断当前表是否在过滤列表中
            return ignoreTables.stream().anyMatch(tableName::equalsIgnoreCase);
        }
    }));
    return interceptor;
}

/**
 * @description:
 * @author: SmallNorth_Lee
 * @date: 2024/5/7 15:29
 * @version: 1.0
 */
public interface DataPermissionHandler {

    /**
     * 获取用户 ID 值表达式，只支持单个 ID 值
     * <p>
     *
     * @return 用户 ID 值表达式
     */
    Expression getCreateUser();

    /**
     * 获取用户字段名
     * <p>
     * 默认字段名叫: create_user
     *
     * @return 用户字段名
     */
    default String getCreateUserColumn() {
        return "create_user";
    }

    /**
     * 根据表名判断是否忽略拼接多用户条件
     * <p>
     * 默认都要进行解析并拼接多用户条件
     *
     * @param tableName 表名
     * @return 是否忽略, true:表示忽略，false:需要解析并拼接多用户条件
     */
    default boolean ignoreTable(String tableName) {
        return false;
    }

    /**
     * 忽略插入用户字段逻辑
     *
     * @param columns        插入字段
     * @param createUserColumn 用户 ID 字段
     * @return
     */
    default boolean ignoreInsert(List<Column> columns, String createUserColumn) {
        return columns.stream().map(Column::getColumnName).anyMatch(i -> i.equalsIgnoreCase(createUserColumn));
    }
}

/**
 * @description:
 * @author: SmallNorth_Lee
 * @date: 2024/5/7 14:14
 * @version: 1.0
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString(callSuper = true)
@EqualsAndHashCode(callSuper = true)
public class CustomLineInnerInterceptor extends BaseMultiTableInnerInterceptor implements InnerInterceptor {

    private DataPermissionHandler dataPermissionHandler;

    @Override
    public void beforeQuery(Executor executor, MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) throws SQLException {
        if (InterceptorIgnoreHelper.willIgnoreTenantLine(ms.getId())) {
            return;
        }
        PluginUtils.MPBoundSql mpBs = PluginUtils.mpBoundSql(boundSql);
        mpBs.sql(parserSingle(mpBs.sql(), null));
    }

    @Override
    public void beforePrepare(StatementHandler sh, Connection connection, Integer transactionTimeout) {
        PluginUtils.MPStatementHandler mpSh = PluginUtils.mpStatementHandler(sh);
        MappedStatement ms = mpSh.mappedStatement();
        SqlCommandType sct = ms.getSqlCommandType();
        if (sct == SqlCommandType.INSERT || sct == SqlCommandType.UPDATE || sct == SqlCommandType.DELETE) {
            if (InterceptorIgnoreHelper.willIgnoreTenantLine(ms.getId())) {
                return;
            }
            PluginUtils.MPBoundSql mpBs = mpSh.mPBoundSql();
            mpBs.sql(parserMulti(mpBs.sql(), null));
        }
    }

    @Override
    protected void processSelect(Select select, int index, String sql, Object obj) {
        final String whereSegment = (String) obj;
        processSelectBody(select.getSelectBody(), whereSegment);
        List<WithItem> withItemsList = select.getWithItemsList();
        if (!CollectionUtils.isEmpty(withItemsList)) {
            withItemsList.forEach(withItem -> processSelectBody(withItem, whereSegment));
        }
    }

    @Override
    protected void processInsert(Insert insert, int index, String sql, Object obj) {
        if (dataPermissionHandler.ignoreTable(insert.getTable().getName())) {
            // 过滤退出执行
            return;
        }
        List<Column> columns = insert.getColumns();
        if (CollectionUtils.isEmpty(columns)) {
            // 针对不给列名的insert 不处理
            return;
        }
        String createUserColumn = dataPermissionHandler.getCreateUserColumn();
        if (dataPermissionHandler.ignoreInsert(columns, createUserColumn)) {
            // 针对已给出租户列的insert 不处理
            return;
        }
        columns.add(new Column(createUserColumn));

        // fixed gitee pulls/141 duplicate update
        List<Expression> duplicateUpdateColumns = insert.getDuplicateUpdateExpressionList();
        if (CollectionUtils.isNotEmpty(duplicateUpdateColumns)) {
            EqualsTo equalsTo = new EqualsTo();
            equalsTo.setLeftExpression(new StringValue(createUserColumn));
            equalsTo.setRightExpression(dataPermissionHandler.getCreateUser());
            duplicateUpdateColumns.add(equalsTo);
        }

        Select select = insert.getSelect();
        if (select != null && (select.getSelectBody() instanceof PlainSelect)) { //fix github issue 4998  修复升级到4.5版本的问题
            this.processInsertSelect(select.getSelectBody(), (String) obj);
        } else if (insert.getItemsList() != null) {
            // fixed github pull/295
            ItemsList itemsList = insert.getItemsList();
            Expression createUser = dataPermissionHandler.getCreateUser();
            if (itemsList instanceof MultiExpressionList) {
                ((MultiExpressionList) itemsList).getExpressionLists().forEach(el -> el.getExpressions().add(createUser));
            } else {
                List<Expression> expressions = ((ExpressionList) itemsList).getExpressions();
                if (CollectionUtils.isNotEmpty(expressions)) {//fix github issue 4998 jsqlparse 4.5 批量insert ItemsList不是MultiExpressionList 了，需要特殊处理
                    int len = expressions.size();
                    for (int i = 0; i < len; i++) {
                        Expression expression = expressions.get(i);
                        if (expression instanceof RowConstructor) {
                            ((RowConstructor) expression).getExprList().getExpressions().add(createUser);
                        } else if (expression instanceof Parenthesis) {
                            RowConstructor rowConstructor = new RowConstructor()
                                    .withExprList(new ExpressionList(((Parenthesis) expression).getExpression(), createUser));
                            expressions.set(i, rowConstructor);
                        } else {
                            if (len - 1 == i) { // (?,?) 只有最后一个expre的时候才拼接tenantId
                                expressions.add(createUser);
                            }
                        }
                    }
                } else {
                    expressions.add(createUser);
                }
            }
        } else {
            throw ExceptionUtils.mpe("Failed to process multiple-table update, please exclude the tableName or statementId");
        }
    }

    /**
     * update 语句处理
     */
    @Override
    protected void processUpdate(Update update, int index, String sql, Object obj) {
        final Table table = update.getTable();
        if (dataPermissionHandler.ignoreTable(table.getName())) {
            // 过滤退出执行
            return;
        }
        ArrayList<UpdateSet> sets = update.getUpdateSets();
        if (!CollectionUtils.isEmpty(sets)) {
            sets.forEach(us -> us.getExpressions().forEach(ex -> {
                if (ex instanceof SubSelect) {
                    processSelectBody(((SubSelect) ex).getSelectBody(), (String) obj);
                }
            }));
        }
        update.setWhere(this.andExpression(table, update.getWhere(), (String) obj));
    }

    /**
     * delete 语句处理
     */
    @Override
    protected void processDelete(Delete delete, int index, String sql, Object obj) {
        if (dataPermissionHandler.ignoreTable(delete.getTable().getName())) {
            // 过滤退出执行
            return;
        }
        delete.setWhere(this.andExpression(delete.getTable(), delete.getWhere(), (String) obj));
    }

    /**
     * 处理 insert into select
     * <p>
     * 进入这里表示需要 insert 的表启用了多租户,则 select 的表都启动了
     *
     * @param selectBody SelectBody
     */
    protected void processInsertSelect(SelectBody selectBody, final String whereSegment) {
        PlainSelect plainSelect = (PlainSelect) selectBody;
        FromItem fromItem = plainSelect.getFromItem();
        if (fromItem instanceof Table) {
            // fixed gitee pulls/141 duplicate update
            processPlainSelect(plainSelect, whereSegment);
            appendSelectItem(plainSelect.getSelectItems());
        } else if (fromItem instanceof SubSelect) {
            SubSelect subSelect = (SubSelect) fromItem;
            appendSelectItem(plainSelect.getSelectItems());
            processInsertSelect(subSelect.getSelectBody(), whereSegment);
        }
    }

    /**
     * 追加 SelectItem
     *
     * @param selectItems SelectItem
     */
    protected void appendSelectItem(List<SelectItem> selectItems) {
        if (CollectionUtils.isEmpty(selectItems)) {
            return;
        }
        if (selectItems.size() == 1) {
            SelectItem item = selectItems.get(0);
            if (item instanceof AllColumns || item instanceof AllTableColumns) {
                return;
            }
        }
        selectItems.add(new SelectExpressionItem(new Column(dataPermissionHandler.getCreateUserColumn())));
    }

    /**
     * 租户字段别名设置
     * <p>tenantId 或 tableAlias.tenantId</p>
     *
     * @param table 表对象
     * @return 字段
     */
    protected Column getAliasColumn(Table table) {
        StringBuilder column = new StringBuilder();
        // todo 该起别名就要起别名,禁止修改此处逻辑
        if (table.getAlias() != null) {
            column.append(table.getAlias().getName()).append(StringPool.DOT);
        }
        column.append(dataPermissionHandler.getCreateUserColumn());
        return new Column(column.toString());
    }

    @Override
    public void setProperties(Properties properties) {
        PropertyMapper.newInstance(properties).whenNotBlank("dataPermissionHandler",
                ClassUtils::newInstance, this::setDataPermissionHandler);
    }

    /**
     * 构建租户条件表达式
     *
     * @param table        表对象
     * @param where        当前where条件
     * @param whereSegment 所属Mapper对象全路径（在原租户拦截器功能中，这个参数并不需要参与相关判断）
     * @return 租户条件表达式
     * @see BaseMultiTableInnerInterceptor#buildTableExpression(Table, Expression, String)
     */
    @Override
    public Expression buildTableExpression(final Table table, final Expression where, final String whereSegment) {
        if (dataPermissionHandler.ignoreTable(table.getName())) {
            return null;
        }
        return new EqualsTo(getAliasColumn(table), dataPermissionHandler.getCreateUser());
    }
}

        interceptor.addInnerInterceptor(new DataPermissionInterceptor(new MultiDataPermissionHandler() {
            @Override
            public Expression getSqlSegment(Table table, Expression where, String mappedStatementId) {
                Column aliasColumn = getAliasColumn(table);
                if (null == aliasColumn) {
                    return null;
                }
                return new EqualsTo(getAliasColumn(table), new StringValue(AuthUtils.getUser()));
            }
        }));

    protected Column getAliasColumn(Table table) {
        //这是案例，多表需要过滤时，可从配置文件或者static代码块中获取
        List<String> ignoreTables = Collections.singletonList("sys_model_relation");
        //判断当前表是否在过滤列表中
        boolean match = ignoreTables.stream().anyMatch(table.getName()::equalsIgnoreCase);
        if (match) {
            return null;
        }
        StringBuilder column = new StringBuilder();
        // todo 该起别名就要起别名,禁止修改此处逻辑
        if (table.getAlias() != null) {
            column.append(table.getAlias().getName()).append(StringPool.DOT);
        }
        column.append("create_user");
        return new Column(column.toString());
    }