From 13102252a1bec39f79fbd85cc221b294904774e4 Mon Sep 17 00:00:00 2001
From: Manuel Rego Casasnovas <rego@igalia.com>
Date: Wed, 28 Dec 2011 13:34:52 +0100
Subject: [PATCH] Show a warning if there is a new project version published.

It checks if there is a new version available via http://libreplan.org/VERSION,
if so it shows a warning message to admin users in order to update to new
version.

The request to URL is done just once a day.

FEA: ItEr76S10NewVersionsNotification
---
 .../business/common/VersionInformation.java   | 75 ++++++++++++++++++-
 .../web/common/TemplateController.java        |  5 ++
 .../main/webapp/common/layout/template.zul    |  9 +++
 3 files changed, 87 insertions(+), 2 deletions(-)

diff --git a/libreplan-business/src/main/java/org/libreplan/business/common/VersionInformation.java b/libreplan-business/src/main/java/org/libreplan/business/common/VersionInformation.java
index 113768faf..6daecdd1c 100644
--- a/libreplan-business/src/main/java/org/libreplan/business/common/VersionInformation.java
+++ b/libreplan-business/src/main/java/org/libreplan/business/common/VersionInformation.java
@@ -19,18 +19,66 @@
 
 package org.libreplan.business.common;
 
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.Date;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
 /**
  * It contains the current version of project and implements of singleton
- * pattern.
+ * pattern. <br />
+ * It also has a cached value with information about last project version
+ * published. It checks the last version against a URL.
+ *
  * @author Susana Montes Pedreira <smontes@wirelessgalicia.com>
  */
 public class VersionInformation {
 
+    private static final Log LOG = LogFactory.getLog(VersionInformation.class);
+
+    /**
+     * URL with a text file only with last number version of LibrePlan
+     */
+    private static final String LIBREPLAN_VERSION_URL = "http://libreplan.org/VERSION";
+
+    /**
+     * Delay to wait till we check the URL again
+     */
+    private static final long DELAY_TO_CHECK_URL = 24 * 60 * 60 * 1000; // 1 day
+
     private static final VersionInformation singleton = new VersionInformation();
 
     private String projectVersion;
 
+    private boolean newVersionCached = false;
+
+    private Date lastVersionCachedDate = new Date();
+
     private VersionInformation() {
+        loadNewVersionFromURL();
+    }
+
+    private void loadNewVersionFromURL() {
+        lastVersionCachedDate = new Date();
+        try {
+            URL url = new URL(LIBREPLAN_VERSION_URL);
+            String lastVersion = (new BufferedReader(new InputStreamReader(
+                    url.openStream()))).readLine();
+            if (projectVersion != null && lastVersion != null) {
+                newVersionCached = !projectVersion.equals(lastVersion);
+            }
+        } catch (MalformedURLException e) {
+            LOG.warn("Problems reading LibrePlan version from "
+                    + LIBREPLAN_VERSION_URL, e);
+        } catch (IOException e) {
+            LOG.warn("Problems reading LibrePlan version from "
+                    + LIBREPLAN_VERSION_URL, e);
+        }
     }
 
     public static VersionInformation getInstance() {
@@ -52,4 +100,27 @@ public class VersionInformation {
         projectVersion = argVersion;
     }
 
-}
\ No newline at end of file
+    /**
+     * Returns true if a new version of the project is published.
+     */
+    public static boolean isNewVersionAvailable() {
+        return singleton.checkIsNewVersionAvailable();
+    }
+
+    /**
+     * If there is a new version already detected, it doesn't check it again.
+     * Otherwise, during one day it returns the cached value. And it checks it
+     * again after that time.
+     */
+    private boolean checkIsNewVersionAvailable() {
+        if (!newVersionCached) {
+            long oneDayLater = lastVersionCachedDate.getTime()
+                    + DELAY_TO_CHECK_URL;
+            if (oneDayLater < new Date().getTime()) {
+                loadNewVersionFromURL();
+            }
+        }
+        return newVersionCached;
+    }
+
+}
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/common/TemplateController.java b/libreplan-webapp/src/main/java/org/libreplan/web/common/TemplateController.java
index 66cb1c88e..01a72b305 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/common/TemplateController.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/common/TemplateController.java
@@ -28,6 +28,7 @@ import java.util.List;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.libreplan.business.common.VersionInformation;
 import org.libreplan.business.scenarios.IScenarioManager;
 import org.libreplan.business.scenarios.entities.Scenario;
 import org.libreplan.web.common.ITemplateModel.IOnFinished;
@@ -182,4 +183,8 @@ public class TemplateController extends GenericForwardComposer {
         return templateModel.isUserAdmin();
     }
 
+    public boolean isNewVersionAvailable() {
+        return VersionInformation.isNewVersionAvailable();
+    }
+
 }
diff --git a/libreplan-webapp/src/main/webapp/common/layout/template.zul b/libreplan-webapp/src/main/webapp/common/layout/template.zul
index 5025e945d..9331af4cb 100644
--- a/libreplan-webapp/src/main/webapp/common/layout/template.zul
+++ b/libreplan-webapp/src/main/webapp/common/layout/template.zul
@@ -156,6 +156,15 @@ signature="java.lang.Boolean isDefaultPasswordsControl()"?>
                 </n:span>
             </div>
         </n:div>
+        <n:div if="${templateCtrl.newVersionAvailable}" id="warningNewVersion"
+            class="footer-messages-area">
+            <div>
+                <n:span>
+                    ${i18n:_("A new version of LibrePlan is avilable. Please check next link for more information:")}
+                    <n:strong><n:a href="http://www.libreplan.com/download/" target="_blank">http://www.libreplan.com/download/</n:a></n:strong>
+                </n:span>
+            </div>
+        </n:div>
     </n:td>
     <n:td height="40" align="right" valign="bottom">
     </n:td>