package com.ruoyi.gateway.filter;
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import java.nio.charset.StandardCharsets;
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import java.util.*;
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import java.util.concurrent.atomic.AtomicReference;
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import com.alibaba.fastjson.JSON;
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import com.alibaba.fastjson.JSONObject;
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import com.ruoyi.common.core.constant.HttpStatus;
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import com.ruoyi.common.core.constant.TokenConstants;
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import com.ruoyi.common.core.utils.ServletUtils;
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import org.apache.commons.codec.binary.Base64;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
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import org.springframework.cloud.gateway.filter.GatewayFilterChain;
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import org.springframework.cloud.gateway.filter.GlobalFilter;
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import org.springframework.core.Ordered;
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import org.springframework.core.io.buffer.DataBuffer;
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import org.springframework.core.io.buffer.DataBufferFactory;
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import org.springframework.core.io.buffer.DataBufferUtils;
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import org.springframework.core.io.buffer.DefaultDataBufferFactory;
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import org.springframework.core.io.buffer.NettyDataBufferFactory;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpMethod;
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import org.springframework.http.MediaType;
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import org.springframework.http.server.reactive.ServerHttpRequest;
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import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
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import org.springframework.stereotype.Component;
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import org.springframework.web.server.ServerWebExchange;
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import com.ruoyi.common.core.utils.StringUtils;
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import com.ruoyi.common.core.utils.html.EscapeUtil;
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import com.ruoyi.gateway.config.properties.XssProperties;
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import io.netty.buffer.ByteBufAllocator;
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import reactor.core.publisher.Flux;
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import reactor.core.publisher.Mono;
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/**
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* 跨站脚本过滤器
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*
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* @author ruoyi
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*/
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@Component
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@ConditionalOnProperty(value = "security.xss.enabled", havingValue = "true")
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public class XssFilter implements GlobalFilter, Ordered
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{
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private static final Logger log = LoggerFactory.getLogger(XssFilter.class);
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// 跨站脚本的 xss 配置，nacos自行添加
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@Autowired
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private XssProperties xss;
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@Override
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public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
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ServerHttpRequest request = exchange.getRequest();
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// xss开关未开启 或 通过nacos关闭，不过滤
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if (!xss.getEnabled()) {
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return chain.filter(exchange);
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}
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// GET DELETE 不过滤
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HttpMethod method = request.getMethod();
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if (method == null || method == HttpMethod.GET || method == HttpMethod.DELETE) {
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return chain.filter(exchange);
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}
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// 非json类型，不过滤
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if (!isJsonRequest(exchange)) {
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return chain.filter(exchange);
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}
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// excludeUrls 不过滤
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String url = request.getURI().getPath();
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if (StringUtils.matches(url, xss.getExcludeUrls())) {
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return chain.filter(exchange);
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}
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ServerHttpRequestDecorator httpRequestDecorator = requestDecorator(exchange);
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return chain.filter(exchange.mutate().request(httpRequestDecorator).build());
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}
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private ServerHttpRequestDecorator requestDecorator(ServerWebExchange exchange) {
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ServerHttpRequestDecorator serverHttpRequestDecorator = new ServerHttpRequestDecorator(exchange.getRequest()) {
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@Override
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public Flux<DataBuffer> getBody() {
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Flux<DataBuffer> body = super.getBody();
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return body.buffer().map(dataBuffers -> {
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DataBufferFactory dataBufferFactory = new DefaultDataBufferFactory();
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DataBuffer join = dataBufferFactory.join(dataBuffers);
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byte[] content = new byte[join.readableByteCount()];
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join.read(content);
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DataBufferUtils.release(join);
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String bodyStr = new String(content, StandardCharsets.UTF_8);
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// 防xss攻击过滤
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bodyStr = EscapeUtil.clean(bodyStr);
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// 转成字节
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byte[] bytes = bodyStr.getBytes();
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NettyDataBufferFactory nettyDataBufferFactory = new NettyDataBufferFactory(ByteBufAllocator.DEFAULT);
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DataBuffer buffer = nettyDataBufferFactory.allocateBuffer(bytes.length);
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buffer.write(bytes);
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return buffer;
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});
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}
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@Override
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public HttpHeaders getHeaders() {
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HttpHeaders httpHeaders = new HttpHeaders();
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httpHeaders.putAll(super.getHeaders());
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// 由于修改了请求体的body，导致content-length长度不确定，因此需要删除原先的content-length
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httpHeaders.remove(HttpHeaders.CONTENT_LENGTH);
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httpHeaders.set(HttpHeaders.TRANSFER_ENCODING, "chunked");
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return httpHeaders;
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}
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};
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return serverHttpRequestDecorator;
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}
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/**
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* 是否是Json请求
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*
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* @param exchange HTTP请求
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*/
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public boolean isJsonRequest(ServerWebExchange exchange) {
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String header = exchange.getRequest().getHeaders().getFirst(HttpHeaders.CONTENT_TYPE);
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return StringUtils.startsWithIgnoreCase(header, MediaType.APPLICATION_JSON_VALUE);
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}
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@Override
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public int getOrder()
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{
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return -100;
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}
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}
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