Directiva de Angular.js para subir archivos Drag on Drop

ngUploadDrop.js

directives.uploadDrop = function (){
 return {
   require: '?ngModel',
   restrict: 'E',
   template: '<div class="input-file" style="width: 150px;"><span class="glyphicon glyphicon-picture"></span></div>',
   link: function (scope, element, attrs, ngModel){

     if (!ngModel) return;

     element.bind('drop', function (event) {
       event.stopPropagation();
       event.preventDefault();

       event.originalEvent.dataTransfer.dropEffect = 'copy';

       var file = event.originalEvent.dataTransfer.files[0];
       reader = new FileReader();
       reader.onload = function (event) {
         var dataURL = reader.result;
         var image = file;

         scope.$apply(function() {
           ngModel.$setViewValue({ src: dataURL, file: file });
         });

       };
       reader.readAsDataURL(file);

       return false;
     });

     element.bind('dragover', function (event) {
       event.stopPropagation();
       event.preventDefault();
       event.originalEvent.dataTransfer.dropEffect = 'copy';
     });

   }
 };
}