1. system 提供 OAuth2TokenApi 接口

2. gateway 通过 feign 引入 OAuth2TokenApi 接口

yudao-gateway/src/main/java/cn/iocoder/yudao/gateway/util/SecurityFrameworkUtils.java

@@ -0,0 +1,39 @@
+package cn.iocoder.yudao.gateway.util;
+
+import org.springframework.util.StringUtils;
+import org.springframework.web.server.ServerWebExchange;
+
+/**
+ * 安全服务工具类
+ *
+ * copy from yudao-spring-boot-starter-security 的 SecurityFrameworkUtils 类
+ *
+ * @author 芋道源码
+ */
+public class SecurityFrameworkUtils {
+
+    public static final String AUTHORIZATION_HEADER = "Authorization";
+
+    public static final String AUTHORIZATION_BEARER = "Bearer";
+
+    private SecurityFrameworkUtils() {}
+
+    /**
+     * 从请求中，获得认证 Token
+     *
+     * @param exchange 请求
+     * @return 认证 Token
+     */
+    public static String obtainAuthorization(ServerWebExchange exchange) {
+        String authorization = exchange.getRequest().getHeaders().getFirst(AUTHORIZATION_HEADER);
+        if (!StringUtils.hasText(authorization)) {
+            return null;
+        }
+        int index = authorization.indexOf(AUTHORIZATION_BEARER + " ");
+        if (index == -1) { // 未找到
+            return null;
+        }
+        return authorization.substring(index + 7).trim();
+    }
+
+}