clean i18n directory when first time loading

src/main/java/org/owasp/webgoat/plugins/Plugin.java

@@ -71,7 +71,7 @@ public class Plugin {
         }
     }
 
-    public void loadFiles(List<Path> files) {
+    public void loadFiles(List<Path> files, boolean reload) {
         for (Path file : files) {
             if (fileEndsWith(file, ".html") && hasParentDirectoryWithName(file, NAME_LESSON_SOLUTION_DIRECTORY)) {
                 solutionLanguageFiles.put(file.getParent().getFileName().toString(), file.toFile());
@@ -83,19 +83,26 @@ public class Plugin {
                 lessonSourceFile = file.toFile();
             }
             if (fileEndsWith(file, ".properties") && hasParentDirectoryWithName(file, NAME_LESSON_I18N_DIRECTORY)) {
+                copyProperties(reload, file);
+            }
+        }
+    }
+
+    private void copyProperties(boolean reload, Path file) {
         try {
             ByteArrayOutputStream bos = new ByteArrayOutputStream();
             Files.copy(file, bos);
             Path propertiesPath = createPropertiesDirectory();
             ResourceBundleClassLoader.setPropertiesPath(propertiesPath);
-                    Files.write(propertiesPath.resolve(file.getFileName()), bos.toByteArray(),
-                        StandardOpenOption.CREATE, StandardOpenOption.APPEND);
+            if ( reload ) {
+                Files.write(propertiesPath.resolve(file.getFileName()), bos.toByteArray(), StandardOpenOption.CREATE, StandardOpenOption.APPEND);
+            } else {
+                Files.write(propertiesPath.resolve(file.getFileName()), bos.toByteArray(), StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
+            }
         } catch (IOException io) {
             throw new PluginLoadingFailure("Property file detected, but unable to copy the properties", io);
         }
     }
-        }
-    }
 
     private Path createPropertiesDirectory() throws IOException {
         if (Files.exists(pluginDirectory.resolve(NAME_LESSON_I18N_DIRECTORY))) {

src/main/java/org/owasp/webgoat/plugins/PluginsLoader.java

@@ -21,7 +21,7 @@ public class PluginsLoader implements Runnable {
         this.path = path;
     }
 
-    public List<Plugin> loadPlugins() {
+    public List<Plugin> loadPlugins(final boolean reload) {
         final List<Plugin> plugins = new ArrayList<Plugin>();
         try {
             Files.walkFileTree(path, new SimpleFileVisitor<Path>() {
@@ -33,7 +33,7 @@ public class PluginsLoader implements Runnable {
                         extractor.extract();
                         Plugin plugin = new Plugin(extractor.getBaseDirectory());
                         plugin.loadClasses(extractor.getClasses());
-                        plugin.loadFiles(extractor.getFiles());
+                        plugin.loadFiles(extractor.getFiles(), reload);
                         plugins.add(plugin);
                     } catch (Plugin.PluginLoadingFailure e) {
                        logger.error("Unable to load plugin, continue reading others...");
@@ -51,6 +51,6 @@ public class PluginsLoader implements Runnable {
 
     @Override
     public void run() {
-        loadPlugins();
+        loadPlugins(true);
     }
 }

src/main/java/org/owasp/webgoat/session/Course.java

@@ -316,7 +316,7 @@ public class Course {
         }
         Path pluginDirectory = Paths.get(path);
         webgoatContext.setPluginDirectory(pluginDirectory);
-        List<Plugin> plugins = new PluginsLoader(pluginDirectory).loadPlugins();
+        List<Plugin> plugins = new PluginsLoader(pluginDirectory).loadPlugins(false);
         for (Plugin plugin : plugins) {
             try {
                 Class<AbstractLesson> c = plugin.getLesson();