Initial RS-ServerAdmnin commit

src/main/java/com/rsscripting/serveradmin/update/GitHubUpdateChecker.java

@@ -0,0 +1,123 @@
+package com.rsscripting.serveradmin.update;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+import javax.xml.parsers.DocumentBuilderFactory;
+import java.net.URL;
+
+
+
+public class GitHubUpdateChecker {
+
+    private final JavaPlugin plugin;
+    private final String pomUrl;
+
+    private static final String POM_URL =
+            "https://raw.githubusercontent.com/RS-Scripting/RS-ServerAdmin/main/pom.xml";
+
+    public GitHubUpdateChecker(
+            JavaPlugin plugin
+    ) {
+
+        this.plugin = plugin;
+        this.pomUrl = POM_URL;
+
+    }
+
+    public void checkForUpdates() {
+
+        plugin.getServer()
+                .getScheduler()
+                .runTaskAsynchronously(
+                        plugin,
+                        () -> {
+
+                            try {
+
+                                String currentVersion =
+                                        plugin.getDescription()
+                                                .getVersion();
+
+                                String latestVersion =
+                                        getLatestVersion();
+
+                                if (latestVersion == null) {
+
+                                    plugin.getLogger().warning(
+                                            "Unable to determine latest version."
+                                    );
+
+                                    return;
+
+                                }
+
+                                if (currentVersion.equals(
+                                        latestVersion
+                                )) {
+
+                                    plugin.getLogger().info(
+                                            "Running latest version ("
+                                                    + currentVersion
+                                                    + ")."
+                                    );
+
+                                } else {
+
+                                    plugin.getLogger().warning(
+                                            "Update available! Current: "
+                                                    + currentVersion
+                                                    + " Latest: "
+                                                    + latestVersion
+                                    );
+
+                                }
+
+                            } catch (Exception ex) {
+
+                                plugin.getLogger().warning(
+                                        "Update check failed."
+
+                                );
+
+                            }
+
+                        }
+                );
+
+    }
+
+    private String getLatestVersion()
+            throws Exception {
+
+        URL url =
+                new URL(
+                        POM_URL
+                );
+
+        var document =
+                DocumentBuilderFactory
+                        .newInstance()
+                        .newDocumentBuilder()
+                        .parse(
+                                url.openStream()
+                        );
+
+        var versions =
+                document.getElementsByTagName(
+                        "version"
+                );
+
+        if (versions.getLength() == 0) {
+
+            return null;
+
+        }
+
+        return versions
+                .item(0)
+                .getTextContent()
+                .trim();
+
+    }
+
+}