[client] Working on Client update checks [WIP]

TODO real URL for getting newest version
TODO continue update check window popup

1 files changed, 97 insertions, 0 deletions

diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/util/ClientVersion.java b/dozentenmodul/src/main/java/org/openslx/dozmod/util/ClientVersion.java
new file mode 100644
index 00000000..a1a86692
--- /dev/null
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/util/ClientVersion.java
@@ -0,0 +1,97 @@
+package org.openslx.dozmod.util;
+
+import java.net.URL;
+import java.util.Scanner;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+
+import org.apache.log4j.Logger;
+
+// ClientVersion is a bad name, TODO find better suited one :)
+public class ClientVersion {
+
+	private static final Logger LOGGER = Logger.getLogger(ClientVersion.class);
+
+	private static String remoteVersion = null;
+	private static Long localRevisionTime = null;
+	private static Long remoteRevisionTime = null;
+	private static String revision = null;
+	
+	private static void init() {
+		// load local version information from the jar's MANIFEST.MF
+		String manifestRev = null;
+		String manifestRevTime = null;
+		try {
+			Attributes attributes = getAttr();
+			if (attributes == null)
+				return;
+			manifestRev = attributes.getValue("Build-Revision");
+			manifestRevTime = attributes.getValue("Build-Revision-Timestamp");
+			if (manifestRev != null)
+				revision = manifestRev;
+			if (manifestRevTime != null)
+				localRevisionTime = Long.valueOf(manifestRevTime);
+		} catch ( NumberFormatException e) {
+			LOGGER.warn("Error while reading version: ", e);
+		}
+		LOGGER.info("Local version timestamp: " + localRevisionTime);
+		// load the remote version information
+		URL remoteVersionUrl = null;
+		Scanner scanner = null;
+		try {
+			remoteVersionUrl = new URL("http://132.230.4.25/dozmod.version");
+			scanner = new Scanner(remoteVersionUrl.openStream());
+		} catch (Exception e) {
+			// TODO shouldn't happen anyways
+			LOGGER.error("Could not download remote version from: " + remoteVersionUrl.getPath(), e);
+		}
+		// process only one line for now
+		Long remoteTime = null;
+		if (scanner.hasNextLong()) {
+			remoteTime = scanner.nextLong();
+		}
+		scanner.close();
+		if (remoteTime != null) {
+			remoteRevisionTime = remoteTime;
+		}
+		LOGGER.info("Remote version timestamp: " + remoteRevisionTime);
+		
+	}
+
+	private static Attributes getAttr() {
+		Class clazz = ClientVersion.class;
+		String className = clazz.getSimpleName() + ".class";
+		String classPath = clazz.getResource(className).toString();
+		if (!classPath.startsWith("jar")) {
+		  // Class not from JAR
+		  return null;
+		}
+		String manifestPath = classPath.substring(0, classPath.lastIndexOf("!") + 1) + 
+		    "/META-INF/MANIFEST.MF";
+		Manifest manifest = null;
+		try {
+			manifest = new Manifest(new URL(manifestPath).openStream());
+		} catch (Exception e) {
+			LOGGER.error("Could not open MANIFEST", e);
+			return null;
+		}
+		Attributes attr = manifest.getMainAttributes();
+		return attr;
+	}
+	public static String getNewVersion() {
+		return getRevision();
+	}
+	public static String getRevision() {
+		if (revision == null)
+			init();
+		return revision;
+	}
+
+	public static boolean isNewest() {
+		if (localRevisionTime == null || remoteRevisionTime == null)
+			init();
+		if (localRevisionTime == null || remoteRevisionTime == null)
+			return true; // hax
+		return localRevisionTime >= remoteRevisionTime;
+	}
+}