(refs #28)Implementing avatar image uploading.

src/main/scala/app/FileUploadController.scala

@@ -0,0 +1,36 @@
+package app
+
+import org.scalatra._
+import org.scalatra.servlet.{MultipartConfig, FileUploadSupport}
+
+/**
+ * Provides Ajax based file upload functionality.
+ *
+ * This servlet saves uploaded file as temporary file and returns the unique key.
+ * You can get uploaded file using [[app.FileUploadUtil#getFile()]] with this key.
+ */
+// TODO Remove temporary files at session timeout by session listener.
+class FileUploadController extends ScalatraServlet with FileUploadSupport with FlashMapSupport {
+  configureMultipartHandling(MultipartConfig(maxFileSize = Some(3*1024*1024)))
+
+  post("/"){
+    fileParams.get("file") match {
+      // TODO save as temporary file and return key.
+      case Some(file) => {
+        println(file.name)
+        println(file.size)
+        Ok("1234")
+      }
+      case None => BadRequest
+    }
+  }
+
+}
+
+// TODO Not implemented yet.
+object FileUploadUtil {
+  def getFile(key: String) = {
+
+  }
+}
+