HttpAuthenticationFilter should choose the strongest authentication mechanism

connectors/apache-connector/src/test/java/org/glassfish/jersey/apache/connector/AuthTest.java

@@ -168,6 +168,25 @@ public String getFilter(@Context HttpHeaders h) {
             return "GET";
         }
 
+        @GET
+        @Path("basicAndDigest")
+        public String getBasicAndDigest(@Context HttpHeaders h) {
+            String value = h.getRequestHeaders().getFirst("Authorization");
+            if (value == null) {
+                throw new WebApplicationException(
+                        Response.status(401).header("WWW-Authenticate", "Basic realm=\"WallyWorld\"")
+                            .header("WWW-Authenticate", "Digest realm=\"WallyWorld\"")
+                            .entity("Forbidden").build());
+            } else if (value.startsWith("Basic")) {
+                throw new WebApplicationException(
+                        Response.status(401).header("WWW-Authenticate", "Basic realm=\"WallyWorld\"")
+                            .header("WWW-Authenticate", "Digest realm=\"WallyWorld\"")
+                            .entity("Digest authentication expected").build());
+            }
+
+            return "GET";
+        }
+
         @POST
         public String post(@Context HttpHeaders h, String e) {
             requestCount++;
@@ -259,6 +278,17 @@ public void testAuthGetWithClientFilter() {
         assertEquals("GET", r.request().get(String.class));
     }
 
+    @Test
+    public void testAuthGetWithBasicAndDigestFilter() {
+        ClientConfig cc = new ClientConfig();
+        cc.connectorProvider(new ApacheConnectorProvider());
+        Client client = ClientBuilder.newClient(cc);
+        client.register(HttpAuthenticationFeature.universal("name", "password"));
+        WebTarget r = client.target(getBaseUri()).path("test/basicAndDigest");
+
+        assertEquals("GET", r.request().get(String.class));
+    }
+
     @Test
     @Ignore("JERSEY-1750: Cannot retry request with a non-repeatable request entity. How to buffer the entity?"
             + " Allow repeatable write in jersey?")

core-client/src/main/java/org/glassfish/jersey/client/authentication/HttpAuthenticationFilter.java

@@ -49,9 +49,9 @@
 import java.util.List;
 import java.util.Map;
 
+import javax.annotation.Priority;
 import javax.ws.rs.Priorities;
 import javax.ws.rs.client.Client;
-import javax.ws.rs.client.ClientBuilder;
 import javax.ws.rs.client.ClientRequestContext;
 import javax.ws.rs.client.ClientRequestFilter;
 import javax.ws.rs.client.ClientResponseContext;
@@ -66,8 +66,6 @@
 import javax.ws.rs.core.MultivaluedMap;
 import javax.ws.rs.core.Response;
 
-import javax.annotation.Priority;
-
 import org.glassfish.jersey.client.ClientProperties;
 import org.glassfish.jersey.client.internal.LocalizationMessages;
 
@@ -222,15 +220,21 @@ public void filter(ClientRequestContext request, ClientResponseContext response)
         Type result = null; // which authentication is requested: BASIC or DIGEST
         boolean authenticate;
 
+        // If the server requests both BASIC and DIGEST, prefer DIGEST since it's stronger
+        // (see https://tools.ietf.org/html/rfc2617#section-4.6)
         if (response.getStatus() == Response.Status.UNAUTHORIZED.getStatusCode()) {
-            String authString = response.getHeaders().getFirst(HttpHeaders.WWW_AUTHENTICATE);
-            if (authString != null) {
-                final String upperCaseAuth = authString.trim().toUpperCase();
-                if (upperCaseAuth.startsWith("BASIC")) {
-                    result = Type.BASIC;
-                } else if (upperCaseAuth.startsWith("DIGEST")) {
-                    result = Type.DIGEST;
-                } else {
+            List<String> authStrings = response.getHeaders().get(HttpHeaders.WWW_AUTHENTICATE);
+            if (authStrings != null) {
+                for (String authString : authStrings) {
+                    final String upperCaseAuth = authString.trim().toUpperCase();
+                    if (result == null && upperCaseAuth.startsWith("BASIC")) {
+                        result = Type.BASIC;
+                    } else if (upperCaseAuth.startsWith("DIGEST")) {
+                        result = Type.DIGEST;
+                    }
+                }
+
+                if (result == null) {
                     // unknown authentication -> this filter cannot authenticate with this method
                     return;
                 }