diff --git a/app/controllers/submissions_controller.rb b/app/controllers/submissions_controller.rb
--- a/app/controllers/submissions_controller.rb
+++ b/app/controllers/submissions_controller.rb
@@ -1,6 +1,6 @@
 class SubmissionsController < ApplicationController
   before_filter :authenticate
-  before_filter :submission_authorization, only: [:show, :direct_edit_submission]
+  before_filter :submission_authorization, only: [:show, :direct_edit_submission, :download]
 
   # GET /submissions
   # GET /submissions.json
@@ -33,6 +33,18 @@
     SubmissionViewLog.create(user_id: session[:user_id],submission_id: @submission.id) unless user.admin?
   end
 
+  def download
+    @submission = Submission.find(params[:id])
+    send_data(@submission.source, {:filename => @submission.download_filename, :type => 'text/plain'})
+  end
+
+  def compiler_msg
+    @submission = Submission.find(params[:id])
+    respond_to do |format|
+      format.js
+    end
+  end
+
   #on-site new submission on specific problem
   def direct_edit_problem
     @problem = Problem.find(params[:problem_id])
@@ -60,63 +72,9 @@
     end
   end
 
-#  # GET /submissions/new
-#  # GET /submissions/new.json
-#  def new
-#    @submission = Submission.new
-#
-#    respond_to do |format|
-#      format.html # new.html.erb
-#      format.json { render json: @submission }
-#    end
-#  end
-#
-#
-#  # POST /submissions
-#  # POST /submissions.json
-#  def create
-#    @submission = Submission.new(params[:submission])
-#
-#    respond_to do |format|
-#      if @submission.save
-#        format.html { redirect_to @submission, notice: 'Submission was successfully created.' }
-#        format.json { render json: @submission, status: :created, location: @submission }
-#      else
-#        format.html { render action: "new" }
-#        format.json { render json: @submission.errors, status: :unprocessable_entity }
-#      end
-#    end
-#  end
-#
-#  # PUT /submissions/1
-#  # PUT /submissions/1.json
-#  def update
-#    @submission = Submission.find(params[:id])
-#
-#    respond_to do |format|
-#      if @submission.update_attributes(params[:submission])
-#        format.html { redirect_to @submission, notice: 'Submission was successfully updated.' }
-#        format.json { head :no_content }
-#      else
-#        format.html { render action: "edit" }
-#        format.json { render json: @submission.errors, status: :unprocessable_entity }
-#      end
-#    end
-#  end
-#
-#  # DELETE /submissions/1
-#  # DELETE /submissions/1.json
-#  def destroy
-#    @submission = Submission.find(params[:id])
-#    @submission.destroy
-#
-#    respond_to do |format|
-#      format.html { redirect_to submissions_url }
-#      format.json { head :no_content }
-#    end
-#  end
 
 protected
+
   def submission_authorization
     #admin always has privileged
     if @current_user.admin?
@@ -133,5 +91,6 @@
     unauthorized_redirect
     return false
   end
+
     
 end