def _sitedata_monkeypatch(site, *args, **kwargs):
"""
Core functionality of decorators above.
This monkeypatches Client or RequestFactory with the appropriate HTTP_HOST, and adds
a SiteData instance as an attribute (so it can be looked at inside of a test).
"""
sitedata = SiteData(label=site, require_exact_match=True)
if 'client' in kwargs.keys():
kwargs['client'] = Client(HTTP_HOST=sitedata.hostname)
kwargs['client'].sitedata = sitedata
if 'rf' in kwargs.keys():
kwargs['rf'] = RequestFactory(HTTP_HOST=sitedata.hostname)
kwargs['rf'].sitedata = sitedata
return args, kwargs
