forked from wgroeneveld/go-jamming
49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
package send
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import (
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"brainbaking.com/go-jamming/rest"
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"github.com/rs/zerolog/log"
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"strings"
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"willnorris.com/go/microformats"
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)
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const (
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TypeWebmention string = "webmention"
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TypeUnknown string = "unknown"
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TypePingback string = "pingback"
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)
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func (sndr *Sender) discover(target string) (link string, mentionType string) {
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mentionType = TypeUnknown
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header, body, err := sndr.RestClient.GetBody(target)
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if err != nil {
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log.Warn().Str("target", target).Msg("Failed to discover possible endpoint, aborting send")
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return
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}
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if strings.Contains(header.Get("link"), TypeWebmention) {
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return buildWebmentionHeaderLink(header.Get("link")), TypeWebmention
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}
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if header.Get("X-Pingback") != "" {
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return header.Get("X-Pingback"), TypePingback
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}
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// this also complies with w3.org regulations: relative endpoint could be possible
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format := microformats.Parse(strings.NewReader(body), rest.BaseUrlOf(target))
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if len(format.Rels[TypeWebmention]) > 0 {
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mentionType = TypeWebmention
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link = format.Rels[TypeWebmention][0]
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} else if len(format.Rels[TypePingback]) > 0 {
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mentionType = TypePingback
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link = format.Rels[TypePingback][0]
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}
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return
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}
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func buildWebmentionHeaderLink(link string) string {
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// e.g. Link: <http://aaronpk.example/webmention-endpoint>; rel="webmention"
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raw := strings.Split(link, ";")[0][1:]
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return raw[:len(raw)-1]
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}
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