/*
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* Copyright (c) 2018-2028, DreamLu All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* Neither the name of the dreamlu.net developer nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* Author: DreamLu 卢春梦 (596392912@qq.com)
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*/
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package org.springblade.core.http;
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import lombok.RequiredArgsConstructor;
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import org.jsoup.nodes.Element;
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import org.jsoup.nodes.TextNode;
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import org.jsoup.select.Elements;
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import org.jsoup.select.Selector;
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import org.springblade.core.tool.utils.ConvertUtil;
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import org.springblade.core.tool.utils.StringPool;
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import org.springblade.core.tool.utils.StringUtil;
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import org.springframework.cglib.proxy.MethodInterceptor;
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import org.springframework.cglib.proxy.MethodProxy;
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import org.springframework.core.ResolvableType;
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import org.springframework.core.convert.TypeDescriptor;
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import javax.annotation.Nullable;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import java.util.stream.Collectors;
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/**
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* 代理模型
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*
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* @author L.cm
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*/
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@RequiredArgsConstructor
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public class CssQueryMethodInterceptor implements MethodInterceptor {
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private final Class<?> clazz;
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private final Element element;
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@Nullable
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@Override
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public Object intercept(Object object, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
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// 只处理 get 方法 is
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String name = method.getName();
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if (!StringUtil.startsWithIgnoreCase(name, StringPool.GET)) {
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return methodProxy.invokeSuper(object, args);
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}
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Field field = clazz.getDeclaredField(StringUtil.firstCharToLower(name.substring(3)));
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CssQuery cssQuery = field.getAnnotation(CssQuery.class);
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// 没有注解，不代理
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if (cssQuery == null) {
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return methodProxy.invokeSuper(object, args);
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}
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Class<?> returnType = method.getReturnType();
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boolean isColl = Collection.class.isAssignableFrom(returnType);
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String cssQueryValue = cssQuery.value();
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// 是否为 bean 中 bean
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boolean isInner = cssQuery.inner();
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if (isInner) {
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return proxyInner(cssQueryValue, method, returnType, isColl);
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}
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Object proxyValue = proxyValue(cssQueryValue, cssQuery, returnType, isColl);
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if (String.class.isAssignableFrom(returnType)) {
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return proxyValue;
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}
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// 用于读取 field 上的注解
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TypeDescriptor typeDescriptor = new TypeDescriptor(field);
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return ConvertUtil.convert(proxyValue, typeDescriptor);
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}
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@Nullable
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private Object proxyValue(String cssQueryValue, CssQuery cssQuery, Class<?> returnType, boolean isColl) {
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if (isColl) {
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Elements elements = Selector.select(cssQueryValue, element);
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Collection<Object> valueList = newColl(returnType);
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if (elements.isEmpty()) {
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return valueList;
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}
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for (Element select : elements) {
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String value = getValue(select, cssQuery);
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if (value != null) {
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valueList.add(value);
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}
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}
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return valueList;
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}
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Element select = Selector.selectFirst(cssQueryValue, element);
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return getValue(select, cssQuery);
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}
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private Object proxyInner(String cssQueryValue, Method method, Class<?> returnType, boolean isColl) {
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if (isColl) {
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Elements elements = Selector.select(cssQueryValue, element);
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Collection<Object> valueList = newColl(returnType);
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ResolvableType resolvableType = ResolvableType.forMethodReturnType(method);
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Class<?> innerType = resolvableType.getGeneric(0).resolve();
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if (innerType == null) {
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throw new IllegalArgumentException("Class " + returnType + " 读取泛型失败。");
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}
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for (Element select : elements) {
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valueList.add(DomMapper.readValue(select, innerType));
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}
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return valueList;
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}
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Element select = Selector.selectFirst(cssQueryValue, element);
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return DomMapper.readValue(select, returnType);
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}
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@Nullable
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private String getValue(@Nullable Element element, CssQuery cssQuery) {
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if (element == null) {
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return null;
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}
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// 读取的属性名
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String attrName = cssQuery.attr();
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// 读取的值
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String attrValue;
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if (StringUtil.isBlank(attrName)) {
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attrValue = element.outerHtml();
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} else if ("html".equalsIgnoreCase(attrName)) {
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attrValue = element.html();
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} else if ("text".equalsIgnoreCase(attrName)) {
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attrValue = getText(element);
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} else if ("allText".equalsIgnoreCase(attrName)) {
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attrValue = element.text();
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} else {
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attrValue = element.attr(attrName);
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}
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// 判断是否需要正则处理
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String regex = cssQuery.regex();
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if (StringUtil.isBlank(attrValue) || StringUtil.isBlank(regex)) {
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return attrValue;
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}
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// 处理正则表达式
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return getRegexValue(regex, cssQuery.regexGroup(), attrValue);
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}
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@Nullable
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private String getRegexValue(String regex, int regexGroup, String value) {
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// 处理正则表达式
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Matcher matcher = Pattern.compile(regex, Pattern.DOTALL | Pattern.CASE_INSENSITIVE).matcher(value);
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if (!matcher.find()) {
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return null;
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}
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// 正则 group
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if (regexGroup > CssQuery.DEFAULT_REGEX_GROUP) {
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return matcher.group(regexGroup);
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}
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return matcher.group();
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}
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private String getText(Element element) {
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return element.childNodes().stream()
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.filter(node -> node instanceof TextNode)
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.map(node -> (TextNode) node)
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.map(TextNode::text)
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.collect(Collectors.joining());
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}
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private Collection<Object> newColl(Class<?> returnType) {
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return Set.class.isAssignableFrom(returnType) ? new HashSet<>() : new ArrayList<>();
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}
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}
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