Github user jmuehlner commented on a diff in the pull request:
https://github.com/apache/incubator-guacamole-client/pull/94#discussion_r91015645
--- Diff:
extensions/guacamole-auth-duo/src/main/java/org/apache/guacamole/auth/duo/DuoAuthenticationProvider.java
---
@@ -0,0 +1,100 @@
+/*
+ * 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.guacamole.auth.duo;
+
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+import org.apache.guacamole.GuacamoleException;
+import org.apache.guacamole.net.auth.AuthenticatedUser;
+import org.apache.guacamole.net.auth.AuthenticationProvider;
+import org.apache.guacamole.net.auth.Credentials;
+import org.apache.guacamole.net.auth.UserContext;
+
+/**
+ * AuthenticationProvider implementation which uses Duo as an additional
+ * authentication factor for users which have already been authenticated by
+ * some other AuthenticationProvider.
+ */
+public class DuoAuthenticationProvider implements AuthenticationProvider {
+
+ /**
+ * Injector which will manage the object graph of this authentication
+ * provider.
+ */
+ private final Injector injector;
+
+ /**
+ * Creates a new DuoAuthenticationProvider that verifies users
+ * using the Duo authentication service
+ *
+ * @throws GuacamoleException
+ * If a required property is missing, or an error occurs while
parsing
+ * a property.
+ */
+ public DuoAuthenticationProvider() throws GuacamoleException {
+
+ // Set up Guice injector.
+ injector = Guice.createInjector(
+ new DuoAuthenticationProviderModule(this)
+ );
+
+ }
+
+ @Override
+ public String getIdentifier() {
+ return "duo";
+ }
+
+ @Override
+ public AuthenticatedUser authenticateUser(Credentials credentials)
+ throws GuacamoleException {
+ return null;
+ }
+
+ @Override
+ public AuthenticatedUser updateAuthenticatedUser(AuthenticatedUser
authenticatedUser,
+ Credentials credentials) throws GuacamoleException {
+ return authenticatedUser;
+ }
+
+ @Override
+ public UserContext getUserContext(AuthenticatedUser authenticatedUser)
+ throws GuacamoleException {
+
+ UserVerificationService authProviderService =
--- End diff --
Did you mean to leave this variable named "authProviderService"?
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