jerqi commented on code in PR #8049:
URL: https://github.com/apache/gravitino/pull/8049#discussion_r2271896022


##########
server-common/src/main/java/org/apache/gravitino/server/authentication/JwksTokenValidator.java:
##########
@@ -147,23 +147,19 @@ private JWKSource<SecurityContext> createJwkSource() 
throws Exception {
     }
   }
 
-  /** Extracts the principal from the validated JWT claims using configured 
field or fallbacks. */
+  /** Extracts the principal from the validated JWT claims using configured 
field(s). */
   private String extractPrincipal(JWTClaimsSet validatedClaims) {
-    // Try the configured principal field first
+    // Try the principal field(s) one by one in order
     if (StringUtils.isNotBlank(principalField)) {
-      String principal = (String) validatedClaims.getClaim(principalField);
-      if (principal != null) {
-        return principal;
-      }
-    }
-
-    // Fallback to common user identity fields
-    // TODO: Consider making this configurable
-    String[] fallbackFields = {"unique_name", "upn", "email", 
"preferred_username", "sub"};
-    for (String field : fallbackFields) {
-      String principal = (String) validatedClaims.getClaim(field);
-      if (principal != null) {
-        return principal;
+      String[] configuredFields = principalField.split(",");

Review Comment:
   ConfigEntry supports the `Sequence`, You can reuse it.



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