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