fix 修复 最新版本gateway不传递X-Forwarded-Prefix请求头导致doc文档无法获取

ruoyi-gateway/src/main/java/org/springframework/cloud/gateway/filter/factory/StripPrefixGatewayFilterFactory.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright 2013-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.gateway.filter.factory;
+
+import org.springframework.cloud.gateway.filter.GatewayFilter;
+import org.springframework.cloud.gateway.filter.GatewayFilterChain;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.util.StringUtils;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.springframework.cloud.gateway.support.GatewayToStringStyler.filterToStringCreator;
+import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR;
+import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.addOriginalRequestUrl;
+
+/**
+ * This filter removes the first part of the path, known as the prefix, from the request
+ * before sending it downstream.
+ *
+ * @author Ryan Baxter
+ */
+public class StripPrefixGatewayFilterFactory
+		extends AbstractGatewayFilterFactory<StripPrefixGatewayFilterFactory.Config> {
+
+	/**
+	 * Parts key.
+	 */
+	public static final String PARTS_KEY = "parts";
+
+	public StripPrefixGatewayFilterFactory() {
+		super(Config.class);
+	}
+
+	@Override
+	public List<String> shortcutFieldOrder() {
+		return Arrays.asList(PARTS_KEY);
+	}
+
+	@Override
+	public GatewayFilter apply(Config config) {
+		return new GatewayFilter() {
+			@Override
+			public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
+				ServerHttpRequest request = exchange.getRequest();
+				addOriginalRequestUrl(exchange, request.getURI());
+				String path = request.getURI().getRawPath();
+				String[] originalParts = StringUtils.tokenizeToStringArray(path, "/");
+
+				// all new paths start with /
+				StringBuilder newPath = new StringBuilder("/");
+				for (int i = 0; i < originalParts.length; i++) {
+					if (i >= config.getParts()) {
+						// only append slash if this is the second part or greater
+						if (newPath.length() > 1) {
+							newPath.append('/');
+						}
+						newPath.append(originalParts[i]);
+					}
+				}
+				if (newPath.length() > 1 && path.endsWith("/")) {
+					newPath.append('/');
+				}
+                // 增加doc前缀传递
+                String prefix = "/" + originalParts[config.getParts() - 1];
+
+				ServerHttpRequest newRequest = request.mutate()
+                    .header("X-Forwarded-Prefix", prefix)
+                    .path(newPath.toString())
+                    .build();
+
+				exchange.getAttributes().put(GATEWAY_REQUEST_URL_ATTR, newRequest.getURI());
+
+				return chain.filter(exchange.mutate().request(newRequest).build());
+			}
+
+			@Override
+			public String toString() {
+				return filterToStringCreator(StripPrefixGatewayFilterFactory.this).append("parts", config.getParts())
+					.toString();
+			}
+		};
+	}
+
+	public static class Config {
+
+		private int parts = 1;
+
+		public int getParts() {
+			return parts;
+		}
+
+		public void setParts(int parts) {
+			this.parts = parts;
+		}
+
+	}
+
+}