Added API to load all ModMetadata from the 'mods' folder (classpath is not included)

src/main/java/ru/bclib/api/dataexchange/handler/DataExchange.java

@@ -30,9 +30,7 @@ import java.util.function.BiConsumer;
 import java.util.stream.Stream;
 
 abstract public class DataExchange {
-	private final Path GAME_FOLDER = FabricLoader.getInstance()
+	
-												 .getGameDir()
-												 .normalize();
 	public final static SyncFolderDescriptor SYNC_FOLDER = new SyncFolderDescriptor("BCLIB-SYNC", FabricLoader.getInstance()
 																											  .getGameDir()
 																											  .resolve("bclib-sync")
@@ -430,7 +428,7 @@ abstract public class DataExchange {
 	
 	protected void registerSyncFolder(String folderID, Path localBaseFolder, boolean removeAdditionalFiles) {
 		localBaseFolder = localBaseFolder.normalize();
-		if (PathUtil.isChildOf(GAME_FOLDER, localBaseFolder)) {
+		if (PathUtil.isChildOf(PathUtil.GAME_FOLDER, localBaseFolder)) {
 			final SyncFolderDescriptor desc = new SyncFolderDescriptor(folderID, localBaseFolder, removeAdditionalFiles);
 			if (this.syncFolderDescriptions.contains(desc)) {
 				BCLib.LOGGER.warning("Tried to override Folder Sync '" + folderID + "' again.");
@@ -440,7 +438,7 @@ abstract public class DataExchange {
 			}
 		}
 		else {
-			BCLib.LOGGER.error(localBaseFolder + " (from " + folderID + ") is outside the game directory " + GAME_FOLDER + ". Sync is not allowed.");
+			BCLib.LOGGER.error(localBaseFolder + " (from " + folderID + ") is outside the game directory " + PathUtil.GAME_FOLDER + ". Sync is not allowed.");
 		}
 	}
 }

src/main/java/ru/bclib/util/PathUtil.java

@@ -1,14 +1,38 @@
 package ru.bclib.util;
 
+import net.fabricmc.loader.api.FabricLoader;
+import net.fabricmc.loader.api.metadata.ModMetadata;
+import net.fabricmc.loader.metadata.ModMetadataParser;
+import net.fabricmc.loader.metadata.ParseMetadataException;
+import org.apache.logging.log4j.LogManager;
+import ru.bclib.BCLib;
+
 import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
 import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.function.Consumer;
+import java.util.jar.JarFile;
 
 public class PathUtil {
+	public final static Path GAME_FOLDER = FabricLoader.getInstance()
+													   .getGameDir()
+													   .normalize();
+	
+	public final static Path MOD_FOLDER = FabricLoader.getInstance()
+													  .getGameDir()
+													  .resolve("mods")
+													  .normalize();
+	
 	/**
 	 * Tests if a path is a child-path.
 	 * <p>
 	 * A path is a child of another if it is located in the parent or any of the parents subdirectories
+	 *
 	 * @param parent The folder we search for the {@code child}
 	 * @param child  The folder you want to test
 	 * @return {@code true} if {@code child} is in {@code parent} or any of its sub directories
@@ -24,6 +48,7 @@ public class PathUtil {
 		
 		return child.equals(parent);
 	}
+	
 	/**
 	 * A simple directory walker that ignores dot-files
 	 *
@@ -56,4 +81,50 @@ public class PathUtil {
 			}
 		}
 	}
+	
+	private static Map<String, ModMetadata> mods;
+	
+	/**
+	 * Unloads the cache of available mods created from {@link #getMods()}
+	 */
+	public static void invalidateCachedMods() {
+		mods = null;
+	}
+	
+	/**
+	 * return a map of all mods that were found in the 'mods'-folder.
+	 * <p>
+	 * The method will cache the results. You can clear that cache (and free the memory) by
+	 * calling {@link #invalidateCachedMods()}
+	 * <p>
+	 * An error message is printed if a mod fails to load, but the parsing will continue.
+	 * @return A map of all found mods. (key=ModID, value={@link ModMetadata})
+	 */
+	public static Map<String, ModMetadata> getMods() {
+		if (mods!=null) return mods;
+		
+		mods = new HashMap<>();
+		org.apache.logging.log4j.Logger logger = LogManager.getFormatterLogger("BCLib|ModLoader");
+		PathUtil.fileWalker(MOD_FOLDER.toFile(), false, (file -> {
+			try {
+				URI uri = URI.create("jar:" + file.toUri());
+				
+				try (FileSystem fs = FileSystems.getFileSystem(uri)) {
+					final JarFile jarFile = new JarFile(file.toString());
+					Path modMetaFile = fs.getPath("fabric.mod.json");
+					
+					ModMetadata mc = ModMetadataParser.parseMetadata(logger, modMetaFile);
+					mods.put(mc.getId(), mc);
+				}
+				catch (ParseMetadataException e) {
+					BCLib.LOGGER.error(e.getMessage());
+				}
+			}
+			catch (IOException e) {
+				BCLib.LOGGER.error(e.getMessage());
+			}
+		}));
+		
+		return mods;
+	}
 }