Support querying for sessions by user identifier

Fixes gh-7

samples/findbyusername/src/main/java/sample/mvc/IndexController.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2002-2015 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.mvc;
+
+import java.security.Principal;
+import java.util.Collection;
+import java.util.Set;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.session.ExpiringSession;
+import org.springframework.session.FindByPrincipalNameSessionRepository;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+/**
+ * Controller for sending the user to the login view.
+ *
+ * @author Rob Winch
+ *
+ */
+@Controller
+public class IndexController {
+	// tag::findbyusername[]
+	@Autowired
+	FindByPrincipalNameSessionRepository<? extends ExpiringSession> sessions;
+
+	@RequestMapping("/")
+	public String index(Principal principal, Model model) {
+		Collection<? extends ExpiringSession> usersSessions =
+				sessions.findByPrincipalName(principal.getName()).values();
+		model.addAttribute("sessions", usersSessions);
+		return "index";
+	}
+	// end::findbyusername[]
+
+	@RequestMapping(value = "/sessions/{sessionIdToDelete}", method = RequestMethod.DELETE)
+	public String removeSession(Principal principal, @PathVariable String sessionIdToDelete) {
+		Set<String> usersSessionIds = sessions.findByPrincipalName(principal.getName()).keySet();
+		if(usersSessionIds.contains(sessionIdToDelete)) {
+			sessions.delete(sessionIdToDelete);
+		}
+
+		return "redirect:/";
+	}
+}