gistfile1.txt

//SINATRA ROUTE
post '/:name/auth/:key' do
  markdown = params[:markdown]
  page = pages.find_one("name" => "#{params[:name]}")
  if page['password'] == "#{params[:key]}"
    pages.update({"name" => "#{params[:name]}"}, {"$set" => {"markdown" => markdown}})
  end
end


//HTML 
<script type="text/javascript">
      $('#submitBtn').click(function() {
        $.ajax({
          type: "POST",
          url: document.location.pathname,
          data: {markdown: $('#editor').val()}
        })
        .done(function(data){
          
        });
      });
</script>