finish!

src/main/java/net/limework/networking/AppleTunneler.java

@@ -0,0 +1,109 @@
+package net.limework.networking;
+
+import com.jcraft.jsch.JSch;
+import com.jcraft.jsch.JSchException;
+import com.jcraft.jsch.Session;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.scheduler.BukkitRunnable;
+
+import java.io.File;
+
+public class AppleTunneler extends JavaPlugin {
+
+    private Session sshSession;
+    private final JSch jsch = new JSch();
+
+    private synchronized void createNewConnection() throws JSchException {
+        if (sshSession != null) {
+            sshSession.disconnect();
+        }
+        java.util.Properties config = new java.util.Properties();
+        config.put("StrictHostKeyChecking", "no");
+        sshSession = jsch.getSession(getUsername(), getHost(), getPort());
+        sshSession.setConfig(config);
+        sshSession.connect(2000);
+        loadRemoteToLocalPortForwarding();
+    }
+
+    private void connectionFailedLog(JSchException exception) {
+        getLogger().severe("==========================");
+        getLogger().severe("failed to start a connection");
+        exception.printStackTrace();
+        getLogger().severe("==========================");
+
+    }
+
+    private void loadIds() throws JSchException {
+        File file = new File(getDataFolder(), "Identities");
+        if (file.mkdir()) {
+            getLogger().info("created Identities folder.");
+        }
+        File[] files = file.listFiles();
+
+        if (files == null) {
+            return;
+        }
+        if (files.length == 0) {
+            getLogger().warning("no Identities files found, please put them in " + file.getPath());
+            throw new RuntimeException("no Identities files found");
+        }
+        for (File id : files) {
+            jsch.addIdentity(id.getPath());
+        }
+    }
+
+    private void loadRemoteToLocalPortForwarding() throws JSchException {
+        for (String line : getConfig().getStringList("ports")) {
+            String[] array = line.split(":");
+            sshSession.setPortForwardingL(Integer.parseInt(array[0]), array[1], Integer.parseInt(array[2]));
+        }
+    }
+
+    @Override
+    public void onEnable() {
+        this.saveDefaultConfig();
+        try {
+            loadIds();
+        } catch (JSchException e) {
+            throw new RuntimeException(e);
+        }
+        try {
+            createNewConnection();
+        } catch (JSchException e) {
+            connectionFailedLog(e);
+        }
+        new BukkitRunnable() {
+            private boolean isConnecting = false;
+
+            @Override
+            public void run() {
+                if (isConnecting) {
+                    return;
+                }
+                if (!sshSession.isConnected()) {
+                    isConnecting = true;
+                    try {
+                        createNewConnection();
+                    } catch (JSchException e) {
+                        connectionFailedLog(e);
+                    }
+                    isConnecting = false;
+                }
+            }
+        }.runTaskTimerAsynchronously(this, 0, 20);
+
+    }
+
+    private int getPort() {
+        return this.getConfig().getInt("port");
+    }
+
+    private String getUsername() {
+        return this.getConfig().getString("username");
+    }
+
+    private String getHost() {
+        return this.getConfig().getString("host");
+    }
+
+}

src/main/resources/config.yml

@@ -0,0 +1,13 @@
+# welcome to the config of ${project.artifactId}
+
+# username for ssh
+username: apple
+# host eg: domains can be used.
+host: 192.168.0.100
+# port
+port: 22
+
+# Syntax is "local-port:remote-host:remote-port"
+ports:
+  - "25565:127.0.0.1:25565"
+

src/main/resources/plugin.yml

@@ -0,0 +1,4 @@
+main: net.limework.networking.AppleTunneler
+version: ${project.version}
+name: ${project.artifactId}
+api-version: 1.13