config = wsfed.Config{}
  // set the metatdata url for the IDP (alternatively set the IDPEndpoint)
	config.MetadataURL = "https://idp.example.com/wsfederation/metadata"
  // trust the certs in the metadata (alternatively set the TrustedCerts)
	config.MetadataCertsAreTrusted = true
  // poll the metadata once a week to check for any new certificates.
  // the default is 0 seconds, which never refreshes after the initial poll
	config.MetadataRefreshIntervalSeconds = 604800
  // set your realm
	config.Realm = "http://realm.example.com"
  // use your config to create a new WSFed object
	sso = wsfed.New(&config)

// get the default request parameters (wa, wtrealm, wct) or create your own
rp := sso.GetDefaultRequestParameters()
// pass the RequestParameters to GetRequestURL
url, err := sso.GetRequestURL(rp)

// get the wresult parameter from the IDP POST
wresult := r.PostFormValue("wresult")
// pass the wresult to ParseResponse
claims, err := sso.ParseResponse(wresult)