GERONIMO-6725 ensure JAXRS ContainerFilterRequest can mutate headers
diff --git a/src/main/java/org/apache/geronimo/microprofile/impl/jwtauth/jaxrs/JAXRSRequestForwarder.java b/src/main/java/org/apache/geronimo/microprofile/impl/jwtauth/jaxrs/JAXRSRequestForwarder.java
new file mode 100644
index 0000000..d3f206e
--- /dev/null
+++ b/src/main/java/org/apache/geronimo/microprofile/impl/jwtauth/jaxrs/JAXRSRequestForwarder.java
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ *     http://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.apache.geronimo.microprofile.impl.jwtauth.jaxrs;
+
+import javax.annotation.Priority;
+import javax.enterprise.context.Dependent;
+import javax.servlet.http.HttpServletRequest;
+import javax.ws.rs.Priorities;
+import javax.ws.rs.container.ContainerRequestContext;
+import javax.ws.rs.container.ContainerRequestFilter;
+import javax.ws.rs.core.Context;
+import javax.ws.rs.ext.Provider;
+
+import org.apache.geronimo.microprofile.impl.jwtauth.servlet.JwtRequest;
+
+@Provider
+@Dependent
+@Priority(Priorities.AUTHENTICATION - 1)
+public class JAXRSRequestForwarder implements ContainerRequestFilter {
+    @Context
+    private HttpServletRequest request;
+
+    @Override
+    public void filter(final ContainerRequestContext requestContext) {
+        final JwtRequest jwtRequest = JwtRequest.class.cast(request.getAttribute(JwtRequest.class.getName()));
+        if (jwtRequest == null) {
+            return;
+        }
+        final String value = requestContext.getHeaders().getFirst(jwtRequest.getHeaderName());
+        if (value != null) {
+            jwtRequest.setAttribute(JAXRSRequestForwarder.class.getName() + ".header", value);
+        }
+    }
+}
diff --git a/src/main/java/org/apache/geronimo/microprofile/impl/jwtauth/servlet/JwtRequest.java b/src/main/java/org/apache/geronimo/microprofile/impl/jwtauth/servlet/JwtRequest.java
index 7510fc7..fc346b4 100644
--- a/src/main/java/org/apache/geronimo/microprofile/impl/jwtauth/servlet/JwtRequest.java
+++ b/src/main/java/org/apache/geronimo/microprofile/impl/jwtauth/servlet/JwtRequest.java
@@ -34,16 +34,19 @@
 import javax.servlet.http.HttpServletResponse;
 
 import org.apache.geronimo.microprofile.impl.jwtauth.JwtException;
+import org.apache.geronimo.microprofile.impl.jwtauth.jaxrs.JAXRSRequestForwarder;
 import org.apache.geronimo.microprofile.impl.jwtauth.jwt.JwtParser;
 import org.eclipse.microprofile.jwt.JsonWebToken;
 
 public class JwtRequest extends HttpServletRequestWrapper implements TokenAccessor {
     private final Supplier<JsonWebToken> tokenExtractor;
+    private final String headerName;
     private volatile JsonWebToken token; // cache for perf reasons
 
     public JwtRequest(final JwtParser service, final String header, final String cookie,
                       final String prefix, final HttpServletRequest request) {
         super(request);
+        this.headerName = header;
 
         this.tokenExtractor = () -> {
             if (token != null) {
@@ -56,7 +59,11 @@
                 }
 
                 boolean fromHeader = true;
-                String auth = getHeader(header);
+                String auth = String.class.cast(
+                    getAttribute("org.apache.geronimo.microprofile.impl.jwtauth.jaxrs.JAXRSRequestForwarder.header"));
+                if (auth == null) {
+                    auth = getHeader(header);
+                }
                 if (auth == null) {
                     final Cookie[] cookies = getCookies();
                     if (cookies != null) {
@@ -98,6 +105,10 @@
         });
     }
 
+    public String getHeaderName() {
+        return headerName;
+    }
+
     public TokenAccessor asTokenAccessor() {
         return this;
     }