Minor bug fix

Author: simonwep

src/express/filter/FilterImpl.java

@@ -40,7 +40,7 @@ public FilterImpl(String requestMethod, String context, HttpRequest httpRequest)
   }
 
   public void setRoot(String root) {
-    if (root == null || root.length() == 0)
+    if (root == null || root.isEmpty())
       return;
 
     if (root.charAt(0) != '/')

src/express/http/response/Response.java

@@ -226,7 +226,6 @@ public boolean isClosed() {
     return this.isClose;
   }
 
-
   private void sendHeaders() {
     try {
 

src/express/middleware/FileProvider.java

@@ -54,13 +54,18 @@ public void handle(Request req, Response res) {
       String name = reqFile.getFileName().toString();
 
       try {
-        Optional<Path> founded = Files.walk(reqFile.getParent()).filter(sub -> getBaseName(sub).equals(name)).findFirst();
+        Path parent = reqFile.getParent();
 
-        if (founded.isPresent())
-          reqFile = founded.get();
+        // Check if reading is allowed
+        if (Files.isReadable(parent)) {
 
+          Optional<Path> founded = Files.walk(parent).filter(sub -> getBaseName(sub).equals(name)).findFirst();
+
+          if (founded.isPresent())
+            reqFile = founded.get();
+        }
       } catch (IOException e) {
-        this.LOGGER.log(Level.WARNING, "Cannot walg file tree.", e);
+        this.LOGGER.log(Level.WARNING, "Cannot walk file tree.", e);
       }
     }