package com.xiaopeng.gateway.filter;
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import com.xiaopeng.common.core.utils.StringUtils;
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import com.xiaopeng.gateway.config.properties.IgnoreWhiteProperties;
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import io.netty.buffer.ByteBufAllocator;
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import org.springframework.beans.factory.annotation.Autowired;
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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.*;
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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 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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public class RequestParamGlobalFilter implements GlobalFilter, Ordered {
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@Autowired
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private IgnoreWhiteProperties ignoreWhite;
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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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ServerHttpRequest.Builder mutate = request.mutate();
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// 跳过不需要验证的路径
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String url = request.getURI().getPath();
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if (StringUtils.matches(url, ignoreWhite.getWhites())) {
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return chain.filter(exchange);
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}
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HttpMethod method = request.getMethod();
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if(method != HttpMethod.POST){
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return chain.filter(exchange);
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}
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String contentType = request.getHeaders().getFirst(HttpHeaders.CONTENT_TYPE);
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// multipart（二进制）请求禁止读取/重写body，否则会导致文件内容损坏
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if (StringUtils.isNotEmpty(contentType) && StringUtils.startsWithIgnoreCase(contentType, "multipart/")) {
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return chain.filter(exchange);
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}
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// 非JSON请求不处理，避免误伤其他content-type
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if (!isJsonContentType(contentType)) {
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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 boolean isJsonContentType(String contentType) {
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if (StringUtils.isEmpty(contentType)) {
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return false;
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}
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if (StringUtils.startsWithIgnoreCase(contentType, MediaType.APPLICATION_JSON_VALUE)) {
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return true;
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}
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// 兼容 application/*+json
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return StringUtils.containsIgnoreCase(contentType, "+json");
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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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// 转成字节
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NettyDataBufferFactory nettyDataBufferFactory = new NettyDataBufferFactory(ByteBufAllocator.DEFAULT);
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DataBuffer buffer = nettyDataBufferFactory.allocateBuffer(content.length);
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buffer.write(content);
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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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@Override
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public int getOrder() {
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return -500;
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}
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}
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