Verifies an account activation code a user received by e-mail.

    Requires Messages Django Contrib.

    :param Requset request:
    :param str code:
    :param str redirect_to:
    :return:

def verify_email(request, code, redirect_to=None):
    """Verifies an account activation code a user received by e-mail.

    Requires Messages Django Contrib.

    :param Requset request:
    :param str code:
    :param str redirect_to:
    :return:
    """
    success = False

    valid_code = EmailConfirmation.is_valid(code)
    if valid_code:
        valid_code.activate()
        success = True

    if success:
        messages.success(request, SIGNUP_VERIFY_EMAIL_SUCCESS_TEXT, 'success')
    else:
        messages.error(request, SIGNUP_VERIFY_EMAIL_ERROR_TEXT, 'danger error')

    if redirect_to is None:
        redirect_to = '/'

    return redirect(redirect_to)