Commit for archival reasons.

src/main/java/xyz/reslate/mcswebapi/MCSWebAPI.java

@@ -0,0 +1,43 @@
+package xyz.reslate.mcswebapi;
+
+import java.util.logging.Logger;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+import io.javalin.Javalin;
+import xyz.reslate.mcswebapi.controllers.ControllerGroup;
+import xyz.reslate.mcswebapi.controllers.PublicServerInformation;
+
+public class MCSWebAPI extends JavaPlugin
+{
+    private Javalin javalin;
+    
+    @Override
+    public void onEnable() {
+        Logger logger = getLogger();
+        logger.info("Enabling MCSWebAPI...");
+        javalin = Javalin.create();
+        javalin.start(8080);
+        prepareControllers(javalin);
+        super.onEnable();
+        logger.info("Enabled MCSWebAPI.");
+    }
+
+    @Override
+    public void onDisable() {
+        Logger logger = getLogger();
+        logger.info("Disabling MCSWebAPI...");
+        javalin.close();
+        super.onDisable();
+        logger.info("Disabled MCSWebAPI.");
+    }
+
+
+    public void prepareControllers(Javalin javalin) {
+        ControllerGroup controllerGroup = new ControllerGroup(javalin, 
+            new PublicServerInformation()
+        );
+        controllerGroup.loadAll();
+    }
+
+}

src/main/java/xyz/reslate/mcswebapi/controllers/ControllerGroup.java

@@ -0,0 +1,22 @@
+package xyz.reslate.mcswebapi.controllers;
+
+import java.util.Arrays;
+import java.util.HashSet;
+
+import io.javalin.Javalin;
+
+public class ControllerGroup {
+    private final HashSet<WebControllable> controllers;
+    private final Javalin javalin;
+    public ControllerGroup(Javalin javalin, WebControllable... controllers) {
+        super();
+        this.javalin = javalin;
+        this.controllers = new HashSet<>(Arrays.asList(controllers));
+    }
+
+    public void loadAll() {
+        for (WebControllable controller : controllers) {
+            controller.register(javalin);
+        }
+    }
+}

src/main/java/xyz/reslate/mcswebapi/controllers/PublicServerInformation.java

@@ -0,0 +1,38 @@
+package xyz.reslate.mcswebapi.controllers;
+
+import java.util.ArrayList;
+
+import org.bukkit.Bukkit;
+
+import io.javalin.Javalin;
+import io.javalin.http.Context;
+
+public class PublicServerInformation implements WebControllable {
+    private String route = "/api/GeneralServerInfo";
+
+    public void getNumPlayersOnline(Context ctx) {
+        ctx.json(Bukkit.getOnlinePlayers().size());
+    }
+
+    public void getMaximumNumPlayers(Context ctx) {
+        ctx.json(Bukkit.getMaxPlayers());
+    }
+
+    public void getServerVersion(Context ctx) {
+        ctx.json(Bukkit.getBukkitVersion());
+    }
+
+    public void getWhitelistedPlayers(Context ctx) {
+        ArrayList<String> playerNames = new ArrayList<>();
+        Bukkit.getWhitelistedPlayers().forEach(player -> playerNames.add(player.getName()));
+        ctx.json(playerNames);
+    }
+
+    @Override
+    public void register(Javalin javalin) {
+        javalin.get(route + "/numPlayersOnline", this::getNumPlayersOnline);
+        javalin.get(route + "/maximumNumPlayers", this::getMaximumNumPlayers);
+        javalin.get(route + "/serverVersion", this::getServerVersion);
+        javalin.get(route + "/whitelistedPlayernames", this::getWhitelistedPlayers);
+    }
+}

src/main/java/xyz/reslate/mcswebapi/controllers/WebControllable.java

@@ -0,0 +1,11 @@
+package xyz.reslate.mcswebapi.controllers;
+
+import io.javalin.Javalin;
+
+public interface WebControllable {
+    /**
+     * Register the endpoints with their respective functions.
+     * @param javalin The running Javalin instance these endpoints will be hosted on.
+     */
+    public void register(Javalin javalin);
+}

src/main/resources/plugin.yml

@@ -0,0 +1,5 @@
+main: xyz.reslate.mcswebapi.MCSWebAPI
+name: MCSWebAPI
+version: 0.0.1
+author: reslate
+description: "A Minecraft Server Web API."

src/test/java/xyz/reslate/mcswebapi/AppTest.java

@@ -0,0 +1,38 @@
+package xyz.reslate.mcswebapi;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+    extends TestCase
+{
+    /**
+     * Create the test case
+     *
+     * @param testName name of the test case
+     */
+    public AppTest( String testName )
+    {
+        super( testName );
+    }
+
+    /**
+     * @return the suite of tests being tested
+     */
+    public static Test suite()
+    {
+        return new TestSuite( AppTest.class );
+    }
+
+    /**
+     * Rigourous Test :-)
+     */
+    public void testApp()
+    {
+        assertTrue( true );
+    }
+}