terraform/svchost/disco/host.go

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package disco
import (
"net/url"
)
type Host struct {
discoURL *url.URL
services map[string]interface{}
}
// ServiceURL returns the URL associated with the given service identifier,
// which should be of the form "servicename.vN".
//
// A non-nil result is always an absolute URL with a scheme of either https
// or http.
//
// If the requested service is not supported by the host, this method returns
// a nil URL.
//
// If the discovery document entry for the given service is invalid (not a URL),
// it is treated as absent, also returning a nil URL.
func (h Host) ServiceURL(id string) *url.URL {
if h.services == nil {
return nil // no services supported for an empty Host
}
urlStr, ok := h.services[id].(string)
if !ok {
return nil
}
ret, err := url.Parse(urlStr)
if err != nil {
return nil
}
if !ret.IsAbs() {
ret = h.discoURL.ResolveReference(ret) // make absolute using our discovery doc URL
}
if ret.Scheme != "https" && ret.Scheme != "http" {
return nil
}
if ret.User != nil {
// embedded username/password information is not permitted; credentials
// are handled out of band.
return nil
}
ret.Fragment = "" // fragment part is irrelevant, since we're not a browser
return h.discoURL.ResolveReference(ret)
}