views.py 文件源码

def get_next_url(request, redirect_field_name):
    """Retrieves next url from request

    Note: This verifies that the url is safe before returning it. If the url
    is not safe, this returns None.

    :arg HttpRequest request: the http request
    :arg str redirect_field_name: the name of the field holding the next url

    :returns: safe url or None

    """
    next_url = request.GET.get(redirect_field_name)
    if next_url:
        kwargs = {
            'url': next_url,
            'host': request.get_host()
        }
        # NOTE(willkg): Django 1.11+ allows us to require https, too.
        if django.VERSION >= (1, 11):
            kwargs['require_https'] = request.is_secure()
        is_safe = is_safe_url(**kwargs)
        if is_safe:
            return next_url
    return None