@user.route('/signin', methods=['GET', 'POST'])
def signin():
    """ Login a user
    """
    form = SigninForm(request.form)
    if request.method == 'POST' and form.validate():
        username = form.username.data
        password = form.password.data

        if username:
            try:
                user = User.objects.get( username = username )
            except User.DoesNotExist:
                form.username.errors = ['No such user or password']
                context = {'form':form}
                return render_template('sign-in.html', **context )

        else:
            form.username.errors = ['Enter a Username or Email address']
            context = {'form':form}
            return render_template('sign-in.html', **context )

        if user.check_password(password):
            login_user(user)
            return render_template( 'close-iframe.html' )
        else:
            form.username.errors = ['No such user or password']
            context = {'form':form}
            return render_template('sign-in.html', **context )