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Upload file using angularJS, CSS and HTML

on 
<html>
   <head>
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js">
      </script>
   </head>

   <body ng-app = "myApp">

      <div ng-controller = "myCtrl">
         <input type = "file" file-model = "myFile"/>
         <button ng-click = "uploadFile()">upload me</button>
      </div>

      <script>
         var myApp = angular.module('myApp', []);

         myApp.directive('fileModel', ['$parse', function ($parse) {
            return {
               restrict: 'A',
               link: function(scope, element, attrs) {
                  var model = $parse(attrs.fileModel);
                  var modelSetter = model.assign;

                  element.bind('change', function() {
                     scope.$apply(function() {
                        modelSetter(scope, element[0].files[0]);
                     });
                  });
               }
            };
         }]);
         myApp.service('fileUpload', ['$https:', function ($https:) {
            this.uploadFileToUrl = function(file, uploadUrl) {
               var fd = new FormData();
               fd.append('file', file);

               $https:.post(uploadUrl, fd, {
                  transformRequest: angular.identity,
                  headers: {'Content-Type': undefined}
               })
               .success(function() {
               })
               .error(function() {
               });
            }
         }]);
         myApp.controller('myCtrl', ['$scope', 'fileUpload', function($scope, fileUpload) {
            $scope.uploadFile = function() {

               var file = $scope.myFile;
               console.log('file is ' );
               console.dir(file);
               var uploadUrl = "/fileUpload";
               fileUpload.uploadFileToUrl(file, uploadUrl);
            };
         }]);
      </script>

   </body>
</html>

What is modelSetter here? Can someone help in explaining this code in detail? What is happening here and how? This seems to be tricky.

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