jQuery File Upload in Flask

gistfile1.txt

<!-- javascript -->
<script type="text/javascript">
$(document).ready(function(){
       // do photo uploads
       $('.fileupload').fileupload({
           dataType: 'json',
           add: function (e, data) {
               var picker = $(this).data('link');
               $(picker).children('span').html('check');
               data.submit();
               /*
               data.context = $('<button/>').text('Upload')
                   .appendTo(document.body)
                   .click(function () {
                       data.context = $('<p/>').text('Uploading...').replaceAll($(this));
                       data.submit();
                       });
                */
           },
           done: function (e, data) {
               //data.context.text('Upload finished.');            
               $.each(data.result.files, function (index, file) {
                   $('<p/>').text(file.name).appendTo(document.body);
               });
           },
           progressall: function (e, data) {
               var progress = parseInt(data.loaded / data.total * 100, 10);
               $('#progress .bar').css(
                   'width',
                   progress + '%'
               );
           }   
       });
});
</script>

<!-- html -->
        <div class="photo-picker">
            <ul class="photo-picker">
                <li><a><span class="ss-icon">plus</span></a></li>
                <li><a><span class="ss-icon">plus</span></a></li>
                <li><a><span class="ss-icon">plus</span></a></li>        
            </ul>    
            <input class="fileupload" type="file" name="files[]" data-url="api/items/upload/">
            <div id="progress">
                <div class="bar" style="width: 0%;"></div>
            </div>
        </div>    


<!-- python -->
@bp.route('/api/items/upload/', methods=['GET', 'POST'])
def api_upload_item_photo():
    
    if request.method == 'POST':
        files = []        
        file = request.files['files[]']
        #if file and allowed_file(file.filename):
        if file:
            print 'its allowed'
            filename = secure_filename(file.filename)
            file.save(os.path.join(exching.config['UPLOAD_PATH'], filename))
            f = {
                'name': filename
            }
            files.append(f)
            return jsonify(files=files)
            
    pass