risdenk commented on a change in pull request #216: KNOX-2149 - 
JWTTokenProvider - JWT verification with OIDC provider by invoking JWKS 
verification url
URL: https://github.com/apache/knox/pull/216#discussion_r357931749
 
 

 ##########
 File path: 
gateway-provider-security-jwt/src/main/java/org/apache/knox/gateway/provider/federation/jwt/filter/AbstractJWTFilter.java
 ##########
 @@ -187,71 +190,75 @@ protected boolean validateAudiences(JWT jwtToken) {
     return valid;
   }
 
-  protected void continueWithEstablishedSecurityContext(Subject subject, final 
HttpServletRequest request, final HttpServletResponse response, final 
FilterChain chain) throws IOException, ServletException {
+  protected void continueWithEstablishedSecurityContext(Subject subject, final 
HttpServletRequest request,
+      final HttpServletResponse response, final FilterChain chain) throws 
IOException, ServletException {
     Principal principal = (Principal) 
subject.getPrincipals(PrimaryPrincipal.class).toArray()[0];
     AuditContext context = auditService.getContext();
     if (context != null) {
-      context.setUsername( principal.getName() );
-      String sourceUri = (String)request.getAttribute( 
AbstractGatewayFilter.SOURCE_REQUEST_CONTEXT_URL_ATTRIBUTE_NAME );
+      context.setUsername(principal.getName());
+      String sourceUri = (String) 
request.getAttribute(AbstractGatewayFilter.SOURCE_REQUEST_CONTEXT_URL_ATTRIBUTE_NAME);
       if (sourceUri != null) {
-        auditor.audit( Action.AUTHENTICATION , sourceUri, ResourceType.URI, 
ActionOutcome.SUCCESS );
+        auditor.audit(Action.AUTHENTICATION, sourceUri, ResourceType.URI, 
ActionOutcome.SUCCESS);
       }
     }
 
     try {
-      Subject.doAs(
-        subject,
-        new PrivilegedExceptionAction<Object>() {
-          @Override
-          public Object run() throws Exception {
-            chain.doFilter(request, response);
-            return null;
-          }
+      Subject.doAs(subject, new PrivilegedExceptionAction<Object>() {
+        @Override
+        public Object run() throws Exception {
+          chain.doFilter(request, response);
+          return null;
         }
-        );
-    }
-    catch (PrivilegedActionException e) {
+      });
+    } catch (PrivilegedActionException e) {
       Throwable t = e.getCause();
       if (t instanceof IOException) {
         throw (IOException) t;
-      }
-      else if (t instanceof ServletException) {
+      } else if (t instanceof ServletException) {
         throw (ServletException) t;
-      }
-      else {
+      } else {
         throw new ServletException(t);
       }
     }
   }
 
   protected Subject createSubjectFromToken(JWT token) {
-    final String principal = token.getSubject();
+    String principal = token.getSubject();
+    String claimvalue = null;
+    if (expectedPrincipalClaim != null) {
+      claimvalue = token.getClaim(expectedPrincipalClaim);
+    }
 
+    if (claimvalue != null) {
+      principal = claimvalue.toLowerCase(Locale.ENGLISH);
 
 Review comment:
   I think this is the only substantial change in this file? Everything else is 
formatting?

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