Add WebSocket Support

Fixes gh-35

samples/websocket/src/main/java/sample/security/CurrentUser.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2002-2013 the original author or authors.
+ *
+ * Licensed 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 sample.security;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.security.core.context.SecurityContextHolder;
+
+/**
+ * Annotate Spring MVC method arguments with this annotation to indicate you
+ * wish to specify the argument with the value of the current
+ * {@link Authentication#getPrincipal()} found on the
+ * {@link SecurityContextHolder}.
+ *
+ * <p>
+ * Creating your own annotation that uses {@link AuthenticationPrincipal} as a
+ * meta annotation creates a layer of indirection between your code and Spring
+ * Security's. For simplicity, you could instead use the
+ * {@link AuthenticationPrincipal} directly.
+ * </p>
+ *
+ * @author Rob Winch
+ *
+ */
+@Target(ElementType.PARAMETER)
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@AuthenticationPrincipal
+public @interface CurrentUser {
+
+}