fix: project overseas authorization outside jwt

common-security/src/main/java/com/baiyue/common/security/AccessTokenSessionValidator.java

@@ -1,6 +1,7 @@
 package com.baiyue.common.security;
 
 import org.springframework.security.oauth2.jwt.Jwt;
+import jakarta.servlet.http.HttpServletRequest;
 
 /**
  * 访问令牌会话有效性校验扩展点，用于在 JWT 校验之外确认服务端登录会话状态。
@@ -8,4 +9,8 @@ import org.springframework.security.oauth2.jwt.Jwt;
 @FunctionalInterface
 public interface AccessTokenSessionValidator {
     AccessTokenSession validate(Jwt jwt);
+
+    default AccessTokenSession validate(Jwt jwt, HttpServletRequest request) {
+        return validate(jwt);
+    }
 }

common-security/src/main/java/com/baiyue/common/security/BaiyueSecurityAutoConfiguration.java

@@ -50,9 +50,11 @@ public class BaiyueSecurityAutoConfiguration {
                                                       org.springframework.beans.factory.ObjectProvider<StringRedisTemplate> redis,
                                                       ObjectMapper objectMapper,
                                                       @Value("${baiyue.security.token-key-prefix:baiyue:auth}") String keyPrefix,
+                                                      @Value("${baiyue.security.gateway-internal-service-token:${baiyue.security.internal-service-token:${INTERNAL_SERVICE_TOKEN:}}}") String gatewayToken,
                                                       @Value("${baiyue.security.session-mode:redis}") String sessionMode) {
         AccessTokenSessionValidator validator;
         if ("claims".equalsIgnoreCase(sessionMode)) validator = new ClaimsAccessTokenSessionValidator();
+        else if ("gateway".equalsIgnoreCase(sessionMode)) validator = new GatewayAccessTokenSessionValidator(gatewayToken);
         else {
             StringRedisTemplate template=redis.getIfAvailable();
             if(template==null) throw new IllegalStateException("session-mode=redis requires StringRedisTemplate");

common-security/src/main/java/com/baiyue/common/security/GatewayAccessTokenSessionValidator.java

@@ -0,0 +1,57 @@
+package com.baiyue.common.security;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.springframework.security.oauth2.jwt.Jwt;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+/** Uses the overseas gateway's authenticated authorization snapshot instead of large JWT claims. */
+public final class GatewayAccessTokenSessionValidator implements AccessTokenSessionValidator {
+    public static final String TOKEN_HEADER = "X-Gateway-Internal-Token";
+    public static final String ROLES_HEADER = "X-Overseas-Roles";
+    public static final String AUTHORITIES_HEADER = "X-Overseas-Authorities";
+
+    private final byte[] expectedToken;
+
+    public GatewayAccessTokenSessionValidator(String expectedToken) {
+        if (expectedToken == null || expectedToken.isBlank()) {
+            throw new IllegalStateException("session-mode=gateway requires an internal service token");
+        }
+        this.expectedToken = expectedToken.getBytes(StandardCharsets.UTF_8);
+    }
+
+    @Override
+    public AccessTokenSession validate(Jwt jwt) {
+        throw new IllegalArgumentException("Gateway authorization headers are required");
+    }
+
+    @Override
+    public AccessTokenSession validate(Jwt jwt, HttpServletRequest request) {
+        String supplied = request.getHeader(TOKEN_HEADER);
+        if (supplied == null || !MessageDigest.isEqual(expectedToken, supplied.getBytes(StandardCharsets.UTF_8))) {
+            throw new IllegalArgumentException("Untrusted overseas gateway authorization context");
+        }
+        Long userId = number(jwt.getClaims().getOrDefault("userId", jwt.getClaims().get("user_id")));
+        return new AccessTokenSession(1, userId, values(request.getHeader(ROLES_HEADER)),
+            values(request.getHeader(AUTHORITIES_HEADER)));
+    }
+
+    private static Long number(Object value) {
+        if (value instanceof Number number) return number.longValue();
+        try { return value == null ? null : Long.valueOf(value.toString()); }
+        catch (NumberFormatException exception) { return null; }
+    }
+
+    private static Set<String> values(String header) {
+        if (header == null || header.isBlank()) return Set.of();
+        LinkedHashSet<String> values = new LinkedHashSet<>();
+        for (String value : header.split(",")) {
+            String normalized = value.trim();
+            if (!normalized.isEmpty()) values.add(normalized);
+        }
+        return Set.copyOf(values);
+    }
+}

common-security/src/main/java/com/baiyue/common/security/JwtAuthenticationFilter.java

@@ -55,7 +55,7 @@ public class JwtAuthenticationFilter extends OncePerRequestFilter {
         String tokenValue = header.substring(BEARER.length()).trim();
         try {
             Jwt jwt = jwtDecoder.decode(tokenValue);
-            AccessTokenSession session = sessionValidator.validate(jwt);
+            AccessTokenSession session = sessionValidator.validate(jwt, request);
             Authentication authentication = claimsMapper.map(jwt, session);
             SecurityContextHolder.getContext().setAuthentication(authentication);
             filterChain.doFilter(request, response);