Load JS plugins! <spigot/repcraft/js-plugins

Author: RepComm

ReadMe.md

@@ -9,7 +9,7 @@ This project is meant to address some issues I have with scriptcraft:
 - Not enough standardized documentation
 - Not enough documented caveats
 - Relies on deprecated java APIs
-
+- It evals every JS file within its plugin structure
 
 This project is a SpigotMC API `JavaPlugin`<br/>
 It gets its capabilities from GraalVM, a modern polyglot virtual machine<br/>

pom.xml

@@ -38,6 +38,12 @@
                 <version>1.15.2-R0.1-SNAPSHOT</version>
                 <scope>provided</scope>
         </dependency>
+    
+      <dependency>
+        <groupId>com.google.code.gson</groupId>
+        <artifactId>gson</artifactId>
+        <version>2.8.5</version>
+      </dependency>
     </dependencies>
     <build>
         <pluginManagement>

src/main/java/com/roguecircuitry/repcraft/RepCraft.java

@@ -1,5 +1,15 @@
 package com.roguecircuitry.repcraft;
 
+import java.io.File;
+import java.io.FileFilter;
+import java.io.FileReader;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.stream.JsonReader;
+
 import org.bukkit.plugin.java.JavaPlugin;
 
 import org.graalvm.polyglot.Context;
@@ -12,13 +22,80 @@ public final class RepCraft extends JavaPlugin {
   Context ctx;
   JSCommand jsc;
   Value jsBinding;
+  File pluginFile, pluginsDir, jsRepCraftDir, jsPluginsDir;
+
+  private void critial(String msg) {
+    System.err.println("[RepCraft][CRITICAL] " + msg);
+    getServer().getPluginManager().disablePlugin(this);
+  }
 
   @Override
-  public void onEnable () {
+  public void onEnable() {
     System.out.println("[RepCraft] Initializing GraalVM js context!");
     this.ctx = Context.newBuilder("js").allowAllAccess(true).build();
     this.jsBinding = this.ctx.getBindings("js");
 
+    File jsPluginsDir = Paths.get("repcraft/js-plugins").toAbsolutePath().toFile();
+    
+    if (!jsPluginsDir.exists()) {
+      if (jsPluginsDir.mkdirs()) {
+        System.out.println("[RepCraft] Created " + jsPluginsDir.getAbsolutePath());
+      } else {
+        this.critial("Failed to create all of the necessary dirs for <spigot>/repcraft/js-plugins");
+        return;
+      }
+    }
+
+    File[] subdirs = jsPluginsDir.listFiles(new FileFilter() {
+      public boolean accept(File f) {
+        return f.isDirectory();
+      }
+    });
+
+    File pluginSubDir = null;
+    File packageJson = null;
+    JsonObject pkgJson = null;
+    JsonParser parser = new JsonParser();
+    String pkgJsonMain = null;
+    File jsPluginFile = null;
+
+    for (int i = 0; i < subdirs.length; i++) {
+      pluginSubDir = subdirs[i];
+
+      packageJson = new File(pluginSubDir.getAbsoluteFile() + "/package.json");
+      try {
+        pkgJson = parser.parse(
+          new JsonReader(
+            new FileReader(
+              packageJson
+            )
+          )
+        ).getAsJsonObject();
+
+      } catch (Exception ex) {
+        // Suppress, file doesn't exist , no biggy :)
+        continue;
+      }
+      // Skip package.json that don't have "main" in them
+      if (!pkgJson.has("main")) continue;
+
+      pkgJsonMain = pkgJson.get("main").getAsString();
+      
+      jsPluginFile = new File(pluginSubDir.getAbsoluteFile() + "/" + pkgJsonMain);
+      if (!jsPluginFile.exists()) {
+        System.err.println("Couldn't import 'main' : " + jsPluginFile.toPath() + ", ignoring!");
+        continue;
+      }
+
+      try {
+        this.ctx.eval("js", new String(Files.readAllBytes(jsPluginFile.toPath())));
+      } catch (Exception e) {
+        //Technically we already handled this, just skip this script
+        e.printStackTrace();
+        continue;
+      }
+    }
+
     try {
       this.ctx.eval("js", "print('[js] Hello World');");
     } catch (Exception ex) {
@@ -31,16 +108,16 @@ public void onEnable () {
     this.getCommand("js").setExecutor(this.jsc);
   }
 
-  public Object eval (String js) {
+  public Object eval(String js) {
     return this.ctx.eval("js", js);
   }
 
-  public void put (String key, Object value) {
+  public void put(String key, Object value) {
     this.jsBinding.putMember(key, value);
   }
 
   @Override
-  public void onDisable () {
+  public void onDisable() {
 
   }
 }