package com.dl.framework.handler;
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import cn.hutool.core.annotation.AnnotationUtil;
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import cn.hutool.core.collection.CollUtil;
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import cn.hutool.core.collection.ConcurrentHashSet;
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import cn.hutool.core.util.ArrayUtil;
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import cn.hutool.core.util.ClassUtil;
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import cn.hutool.core.util.ObjectUtil;
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import com.dl.common.annotation.DataColumn;
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import com.dl.common.annotation.DataPermission;
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import com.dl.common.core.domain.dto.RoleDTO;
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import com.dl.common.core.domain.model.LoginUser;
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import com.dl.common.enums.DataScopeType;
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import com.dl.common.exception.ServiceException;
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import com.dl.common.helper.DataPermissionHelper;
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import com.dl.common.helper.LoginHelper;
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import com.dl.common.utils.StreamUtils;
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import com.dl.common.utils.StringUtils;
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import com.dl.common.utils.spring.SpringUtils;
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import lombok.extern.slf4j.Slf4j;
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import net.sf.jsqlparser.JSQLParserException;
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import net.sf.jsqlparser.expression.Expression;
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import net.sf.jsqlparser.expression.Parenthesis;
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import net.sf.jsqlparser.expression.operators.conditional.AndExpression;
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import net.sf.jsqlparser.parser.CCJSqlParserUtil;
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import org.springframework.context.expression.BeanFactoryResolver;
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import org.springframework.expression.BeanResolver;
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import org.springframework.expression.ExpressionParser;
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import org.springframework.expression.ParserContext;
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import org.springframework.expression.common.TemplateParserContext;
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import org.springframework.expression.spel.standard.SpelExpressionParser;
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import org.springframework.expression.spel.support.StandardEvaluationContext;
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import java.lang.reflect.Method;
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import java.util.*;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.function.Function;
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import java.util.stream.Collectors;
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/**
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* 数据权限过滤
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*
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* @author Lion Li
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* @version 3.5.0
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*/
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@Slf4j
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public class PlusDataPermissionHandler {
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/**
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* 方法或类(名称) 与 注解的映射关系缓存
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*/
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private final Map<String, DataPermission> dataPermissionCacheMap = new ConcurrentHashMap<>();
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/**
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* 无效注解方法缓存用于快速返回
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*/
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private final Set<String> invalidCacheSet = new ConcurrentHashSet<>();
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/**
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* spel 解析器
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*/
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private final ExpressionParser parser = new SpelExpressionParser();
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private final ParserContext parserContext = new TemplateParserContext();
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/**
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* bean解析器 用于处理 spel 表达式中对 bean 的调用
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*/
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private final BeanResolver beanResolver = new BeanFactoryResolver(SpringUtils.getBeanFactory());
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public Expression getSqlSegment(Expression where, String mappedStatementId, boolean isSelect) {
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DataColumn[] dataColumns = findAnnotation(mappedStatementId);
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if (ArrayUtil.isEmpty(dataColumns)) {
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invalidCacheSet.add(mappedStatementId);
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return where;
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}
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LoginUser currentUser = DataPermissionHelper.getVariable("user");
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if (ObjectUtil.isNull(currentUser)) {
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currentUser = LoginHelper.getLoginUser();
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DataPermissionHelper.setVariable("user", currentUser);
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}
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// 如果是超级管理员，则不过滤数据
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if (LoginHelper.isAdmin()) {
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return where;
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}
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String dataFilterSql = buildDataFilter(dataColumns, isSelect);
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if (StringUtils.isBlank(dataFilterSql)) {
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return where;
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}
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try {
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Expression expression = CCJSqlParserUtil.parseExpression(dataFilterSql);
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// 数据权限使用单独的括号 防止与其他条件冲突
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Parenthesis parenthesis = new Parenthesis(expression);
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if (ObjectUtil.isNotNull(where)) {
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return new AndExpression(where, parenthesis);
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} else {
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return parenthesis;
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}
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} catch (JSQLParserException e) {
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throw new ServiceException("数据权限解析异常 => " + e.getMessage());
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}
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}
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/**
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* 构造数据过滤sql
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*/
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private String buildDataFilter(DataColumn[] dataColumns, boolean isSelect) {
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// 更新或删除需满足所有条件
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String joinStr = isSelect ? " OR " : " AND ";
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LoginUser user = DataPermissionHelper.getVariable("user");
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StandardEvaluationContext context = new StandardEvaluationContext();
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context.setBeanResolver(beanResolver);
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DataPermissionHelper.getContext().forEach(context::setVariable);
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Set<String> conditions = new HashSet<>();
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for (RoleDTO role : user.getRoles()) {
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user.setRoleId(role.getRoleId());
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// 获取角色权限泛型
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DataScopeType type = DataScopeType.findCode(role.getDataScope());
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if (ObjectUtil.isNull(type)) {
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throw new ServiceException("角色数据范围异常 => " + role.getDataScope());
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}
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// 全部数据权限直接返回
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if (type == DataScopeType.ALL) {
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return "";
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}
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boolean isSuccess = false;
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for (DataColumn dataColumn : dataColumns) {
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if (dataColumn.key().length != dataColumn.value().length) {
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throw new ServiceException("角色数据范围异常 => key与value长度不匹配");
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}
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// 不包含 key 变量 则不处理
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if (!StringUtils.containsAny(type.getSqlTemplate(),
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Arrays.stream(dataColumn.key()).map(key -> "#" + key).toArray(String[]::new)
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)) {
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continue;
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}
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// 设置注解变量 key 为表达式变量 value 为变量值
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for (int i = 0; i < dataColumn.key().length; i++) {
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context.setVariable(dataColumn.key()[i], dataColumn.value()[i]);
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}
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// 解析sql模板并填充
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String sql = parser.parseExpression(type.getSqlTemplate(), parserContext).getValue(context, String.class);
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conditions.add(joinStr + sql);
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isSuccess = true;
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}
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// 未处理成功则填充兜底方案
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if (!isSuccess && StringUtils.isNotBlank(type.getElseSql())) {
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conditions.add(joinStr + type.getElseSql());
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}
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}
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if (CollUtil.isNotEmpty(conditions)) {
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String sql = StreamUtils.join(conditions, Function.identity(), "");
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return sql.substring(joinStr.length());
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}
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return "";
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}
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private DataColumn[] findAnnotation(String mappedStatementId) {
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StringBuilder sb = new StringBuilder(mappedStatementId);
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int index = sb.lastIndexOf(".");
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String clazzName = sb.substring(0, index);
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String methodName = sb.substring(index + 1, sb.length());
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Class<?> clazz = ClassUtil.loadClass(clazzName);
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List<Method> methods = Arrays.stream(ClassUtil.getDeclaredMethods(clazz))
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.filter(method -> method.getName().equals(methodName)).collect(Collectors.toList());
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DataPermission dataPermission;
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// 获取方法注解
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for (Method method : methods) {
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dataPermission = dataPermissionCacheMap.get(mappedStatementId);
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if (ObjectUtil.isNotNull(dataPermission)) {
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return dataPermission.value();
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}
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if (AnnotationUtil.hasAnnotation(method, DataPermission.class)) {
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dataPermission = AnnotationUtil.getAnnotation(method, DataPermission.class);
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dataPermissionCacheMap.put(mappedStatementId, dataPermission);
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return dataPermission.value();
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}
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}
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dataPermission = dataPermissionCacheMap.get(clazz.getName());
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if (ObjectUtil.isNotNull(dataPermission)) {
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return dataPermission.value();
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}
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// 获取类注解
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if (AnnotationUtil.hasAnnotation(clazz, DataPermission.class)) {
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dataPermission = AnnotationUtil.getAnnotation(clazz, DataPermission.class);
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dataPermissionCacheMap.put(clazz.getName(), dataPermission);
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return dataPermission.value();
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}
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return null;
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}
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/**
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* 是否为无效方法 无数据权限
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*/
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public boolean isInvalid(String mappedStatementId) {
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return invalidCacheSet.contains(mappedStatementId);
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}
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}
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