@timeline_app.route('/<username>', method='POST')
def timeline_post(mongodb, username=None):
    data = request.json
    api = Base(mongodb, collection)

    required = {'owner_user': unicode, 'text': unicode}
    check = api.check_required(data=data, required=required)
    if check:
        return check

    if not api.check_exist('user', 'username', username):
        return {'status': 'error',
                'message': "Username {} is not valid.".format(username)}

    if not api.check_exist('user', 'username', data.get('owner_user')):
        return {'status': 'error',
                'message': "owner_user {} is not user valid.".format(data.get('owner_user'))}

    posts = {}
    posts['username'] = data.get('owner_user')
    posts['text'] = data.get('text')
    posts['like'] = []
    new_uuid = uuid.uuid4()
    posts['uid'] = hmac.new(new_uuid.bytes, digestmod=sha1).hexdigest()
    posts['date_post'] = datetime.now()

    obj = api.check_exist(collection, 'username', username)
    if obj:
        obj['posts'].append(posts)
        return api.put(slug=username, field={'key': 'username', 'value': 'username'}, request_json=obj)

    data = {"username": username, "posts": [posts,]}

    return api.post(field={'key': 'username', 'value': 'username'}, request_json=data)