GUACAMOLE-289: Add getResource() functions to UserContext and AuthenticationProvider, allowing extensions to expose arbitrary REST resources/services.

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/InjectedAuthenticationProvider.java

@@ -70,6 +70,11 @@ public abstract class InjectedAuthenticationProvider implements AuthenticationPr
 
     }
 
+    @Override
+    public Object getResource() throws GuacamoleException {
+        return null;
+    }
+
     @Override
     public AuthenticatedUser authenticateUser(Credentials credentials)
             throws GuacamoleException {

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/sharing/user/SharedUserContext.java

@@ -136,6 +136,11 @@ public class SharedUserContext implements UserContext {
         return self;
     }
 
+    @Override
+    public Object getResource() throws GuacamoleException {
+        return null;
+    }
+
     @Override
     public AuthenticationProvider getAuthenticationProvider() {
         return authProvider;

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/user/ModeledUserContext.java

@@ -116,6 +116,11 @@ public class ModeledUserContext extends RestrictedObject
         return getCurrentUser().getUser();
     }
 
+    @Override
+    public Object getResource() throws GuacamoleException {
+        return null;
+    }
+
     @Override
     public AuthenticationProvider getAuthenticationProvider() {
         return getCurrentUser().getModelAuthenticationProvider();